JPH0637787Y2 - Electrically heated insulation container - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrically heated insulating container that can be heated by itself and has excellent heat retention performance.

"Conventional technology" In recent years, there is no need to transfer food that has been cooked as cooking utensils such as pots and kettles to another heat-retaining container, and various types of electrically heated insulation that can be kept warm as it is A container has been proposed. The present applicants have also proposed, in Japanese Utility Model Application No. 57-199440, an electrically heated metal thermos bottle having an internal heating element.

FIG. 5 shows these conventional electrically heated insulating containers. This electrically heated insulation container is made of a metal such as a stainless steel inner bottle 1 having a mouth and a body having a diameter larger than the mouth, and a metal having a diameter larger than the inner bottle 1 such as stainless steel. The outer bottle 2 is formed by joining the mouth portion of the inner bottle 1 and the mouth portion of the outer bottle 2 by welding or the like. The space between the inner bottle 1 and the outer bottle 2 forms a vacuum heat insulating layer 3. A sealed heating element 4 such as a sheathed heater is fixed to the bottom of the inner bottle 1 by welding or the like. The hermetically-sealed heating element 4 has a heating wire 6 inserted into a metal sheath 5, lead wires 7 are connected to both ends of the heating wire 6, and the heating wire 6 and the lead wire 7 are connected together. The periphery is filled with an insulator 8 such as alumina powder or magnesia powder in order to insulate the metal sheath 5.

"Problems to be solved by the invention" However, in the conventional electric heating type heat insulating container having such a structure, since the vacuum heat insulating layer 3 needs to be kept at a high vacuum, the heater type is limited to a sealed type such as a sheathed heater. Therefore, it is heavy and expensive. In addition, it is difficult to provide a large output heater for boiling water and a small output heater for keeping heat at the same time like a so-called band heater.

Since it is in a high vacuum, it is difficult to attach and connect parts, and because there are restrictions on degassing the materials that can be used in a high vacuum, temperature sensors such as thermostats,
It is difficult to detect the hot water temperature by equipping the inner tank with a temperature controller.

It has a drawback such as.

Further, in order to solve the above drawbacks, a structure in which a heater, a temperature controller, and the like are unitized and the vacuum heat insulating layer 3 is penetrated is proposed in JP-A-61-5822.
However, in this proposal, there is a problem that the unit itself becomes expensive because it is necessary to keep the inside of the unit airtight, and furthermore, the inner bottle and the outer bottle provided for mounting the unit are connected to each other. Since the structure is intended to suppress the heat loss from the hole, there is a problem that the outer shape of the container becomes large and the container becomes expensive.

On the other hand, as disclosed in Japanese Utility Model Publication No. 49-40427, a container in which the outside of a container with a heater is wrapped with a heat insulating material has been proposed, but it has a drawback of insufficient heat insulating performance, In order to keep it at (90 to 95 ° C), the heating by the heater is continued without interruption, and there is a problem that it consumes a lot of power and is uneconomical.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electrically heated heat insulating container that is inexpensive and has an excellent heat retention effect.

"Means for Solving the Problem" In the present invention, in the space between the inner bottle and the outer bottle of the double-walled structure container in which the inner bottle and the outer bottle are joined at the mouth with a gap. , Electrical equipment such as heaters and thermostats are arranged in contact with the wall of the inner bottle, and inorganic heat resistant insulating powder material is filled to surround the electrical equipment and 10 to 1 × 10
^The above problem was solved by an electrically heated insulating container with a vacuum degree of ^-3 Torr.

[Operation] In the present invention, since it is not necessary to maintain a high vacuum in the space between the inner bottle and the outer bottle, it becomes easy to attach a heater, a heater, and other electrical equipment to the inner bottle. . Further, it is possible to use general materials and parts that cannot be used under a high vacuum, and further, since an inorganic heat resistant insulating powder material is used, when degassing occurs, this can be adsorbed to prevent vacuum deterioration. In the present invention, the effect is further exerted due to the low vacuum.

[Examples] Hereinafter, the electrically heated insulating container of the present invention will be described in detail with reference to Examples.

(Embodiment 1) FIG. 1 is a view showing an example (Embodiment 1) of an electrically heated insulation container according to the present invention. Reference numeral 9 in the figure indicates an inner bottle. The inner bottle 9 has a bottomed cylindrical shape consisting of a mouth portion and a body portion having a diameter larger than that of the mouth portion, and at the mouth portion thereof is connected to one end of a bottomed cylindrical outer bottle 11 via a connecting member 10. It is airtightly joined by welding or the like. The outer bottle 11 is composed of an outer cylinder 12 and a bottom surface portion 13 and forms a double structure with the inner bottle 9. The bottom surface portion 13 is airtightly joined to the outer cylinder 12 at an end portion of the outer cylinder 12 which is different from the joint end with the connecting portion 10. The space 14 formed between the outer bottle 11 and the inner bottle 9 is filled with pearlite powder having a particle size of about 10 μm as a heat-resistant insulating material,
Furthermore, a low vacuum state of about 1 × 10 ^{-1 to} 5 × 10 ^-1 is set. A lid portion 15 having a pump-type pumping device is attached to the mouth portion of the inner bottle 9 so that the inner bottle 9 can be sealed. The lid portion 15 has a plug body 16, a ventilation passage 17 for releasing steam when boiling,
A boiling detector 18 and the like installed in the air passage 17 are provided. The bottom body 19 has screws 20 ...
It is attached by being screwed into a screw receiving portion 21 provided on the bottom of the bottom body 19.
22 is fixedly stored. Further, on the outer peripheral portion of the bottom body 19,
A plug receiver 23 connected to the temperature control unit 22 is provided.

The bottom surface of the inner bottle 9 and the bottom surface portion 13 of the outer bottle 11 of this embodiment will be further described with reference to FIG.

On the bottom surface of the inner bottle 9, a disk-shaped heater 25 having a hole 24 in the center is attached by a metal fitting 26 or the like, and a thermostat 27 is also attached by a metal fitting 26 or the like in the hole 24. There is. Furthermore, a thermal fuse 28 is attached to the metal fitting 26. Wirings 29 of electric equipment such as the heater 25, the thermostat 27, and the thermal fuse 28 are led out from the void portion 14 into the bottom body 19 by the lead-out portions 30 and 30 airtightly attached to the bottom surface portion 13 by an epoxy adhesive. Further, it is connected to the temperature control unit 22.

In the above embodiment, the heat-resistant insulating material filled in the voids 14 is filled with pearlite powder having a particle size of about 10 μm. However, the present invention is not limited to this. Preferable examples include grown silica, wet-synthesized silica, calcium silicate, diatomaceous earth, fine powder powder such as shirasu balloon, and compacts such as calcium silicate. Further, in the above embodiment, the degree of vacuum of the void portion 14 is 1 × 10 ^{-1 to} 5 × 10 ^-1 , but in the present invention, it is 10 Torr.
A vacuum state of up to 1 × 10 ^-3 Torr is preferred. Here, if it is 10 Torr or more, the heat insulating effect cannot be obtained, and 1 ×
Equivalent heat insulation effect can be obtained without the need for a high vacuum of 10 ^-3 or less. Further, the inner bottle 9, the outer bottle 11, etc. are usually made of a metal material such as stainless steel, but in the present invention, the outer bottle 11 is used.
May be plastic whose inner surface is plated with a high gas barrier property.

Next, the heating and heat retaining functions of this embodiment will be described.

First, water is put in the inner bottle 9, and the heater 25 is energized. When the temperature of the water in the inner bottle rises and reaches the boiling point, the water boils, and the boiled steam is passed through the ventilation passage 17 provided in the lid 15.
To reach the boiling detector 18. When boiling is detected, the temperature control unit 22 stops energizing the heater 25. After this, when the water temperature drops below the first set value (eg 93 ° C),
The thermostat 27 is energized, and accordingly, the temperature controller 22 starts energizing the heater 25. As a result, when the water temperature rises and becomes equal to or higher than the second set value (for example, 98 ° C.), the thermostat 27 is de-energized and the heating heater 25 is de-energized. Hereinafter, the water temperature continues to rise and fall between the first set value and the second set value. In addition, since the temperature of the heater 25 becomes abnormally high when cooking with air, the thermostat 27 is de-energized and the heater 25 is de-energized. If the heater 25 does not stop energizing due to some trouble, a thermal fuse
When the temperature reaches or exceeds the preset temperature of 28, the thermal fuse 25 is blown and the heating heater 25 is de-energized.

Here, the pearlite powder is composed of a component similar to porcelain known as a heat-resistant insulating material, and has not only high insulation resistance and dielectric strength, but also excellent fire resistance that it does not melt up to 1200 ° C. Therefore, there is no problem even if the temperature rises considerably.

(Embodiment 2) Another embodiment (Embodiment 2) of the present invention will be described with reference to FIG.

Example 2 and Example 1 are different from each other in three points: the shape of the inner bottle, the shape of the heating element and its installation position, and the heat detection switch (bimetal, TRS, etc.) 35 installed.

In this embodiment, the inner bottle 9 includes an inner cylinder 31 and a bottom portion for the inner cylinder.
It is formed from 32 and. The inner cylinder 31 is composed of a mouth portion, a body portion having a diameter larger than the mouth portion, and a heating element installation portion 33 having a diameter slightly smaller than the body portion provided on the end side different from the mouth portion. The bottom surface portion 32 is hermetically joined to the end portion of the inner cylinder 31 on the heating element installation portion 33 side. The heating element installation section 33
A cylindrical band heater 34 is attached to the.
In addition, the heat detection switch 35
In addition, a thermostat 27 and a thermal fuse 28 are provided. Other configurations such as the outer bottle 11 and the bottom body 19 are almost the same as those in the first embodiment.

Next, the heating and heat retaining functions of this embodiment will be described.

Water is put in the inner bottle 9 and the energization of the band heater 34 is started. When the temperature of the hot water exceeds the first set value of 95 ° C., the heat detection switch 35 operates, and the energization of the small-heat-output portion of the band heater 34 is stopped. The water temperature then rises further and begins to boil. This vapor passes through the ventilation passage 17 and is detected by the boiling detector 18. The temperature controller 2 senses this and stops energizing the high-power portion of the band heater 34 for boiling water. After that, the hot water temperature decreases, and when the hot water temperature becomes equal to or lower than the second set value of 92 ° C., the heat detection switch 35 operates and the energization of the band heater 34 to the small output portion for heat retention is restarted. After that, energization and de-energization are repeated, and the hot water temperature
Go up and down between 92 ° C and 95 ° C. In the case of intentionally cooking in the air, the thermostat 27 stops all energization to the band heater 34. The temperature fuse 28 is blown when the temperature of the band heater 34 or the bottom part 32 for the inner cylinder continues to rise due to some abnormality, so that the power supply to the band beater 34 is stopped (Example) ) FIG. 4 shows a measuring container for measuring the heat retaining effect of the present invention. This measuring container has a bottomed cylindrical inner cylinder 40,
A double structure is formed by an outer cylinder 41 having a bottomed cylindrical shape having a diameter larger than that of the inner cylinder 40 that is airtightly joined at the mouth of the inner cylinder 40. Is attached so that it can be sealed. The space 43 formed between the inner cylinder 40 and the outer cylinder 41 was filled with pearlite powder (FWN-1 manufactured by Mitsui Kinzoku Co., Ltd.) having an average particle diameter of 10 μm (maximum 50 μm) at a packing density of 0.16 g.
Filled with / cm ³ .

The degree of vacuum was 2 × 10 ^-2 Torr.

The heat retention effect was measured using the above measuring container. Hot water of 95 ° C. was poured into this measuring container, and the container was sealed with a foam sealing stopper 42. After 24 hours, the temperature was measured and found to be 37 ° C. This is equivalent to the high vacuum type currently on the market.

In addition, the same conditions as in this embodiment, that is, the same degree of vacuum,
The same pearlite powder was filled at the same packing density, and the temperature fuse, thermistor, thermostat, and band heater were left in this for 72 hours, but no abnormality was observed.

Although the electric kettle thermos has been described as an example, the present invention is not limited to this.
It may be an electronic jar or the like.

"Effect of the invention" As described above, the electrically heated insulation container of the present invention is
In the gap between the inner bottle and the outer bottle of the double-walled structure container in which the inner bottle and the outer bottle are joined at the mouth portion with a gap, the heater in contact with the wall of the inner bottle, such as a thermostat It is characterized in that the electric equipment is arranged, and the inorganic heat-resistant insulating powder material is filled so as to surround the electric equipment and has a vacuum degree of 10 to 1 × 10 ⁻³ Torr. Since it is in a low vacuum of 10 Torr to 1 × 10 ^-3 Torr, general commercial products can be used for parts such as heaters and thermostats, and no special expensive parts are required.

Special materials and pretreatment are required for metal fittings in a high vacuum, but since the present invention provides sufficient heat insulation performance in a low vacuum, a wide range of materials, etc. can be selected. It can be sealed with an agent.

Since the inorganic heat resistant insulating powder material is used, when degassing occurs, it is adsorbed and vacuum deterioration can be prevented. Particularly in the present invention, the effect is further large because of the low vacuum.

Since the powder made of the insulating material is used, sufficient insulation can be obtained in the wiring in the void. Therefore, it is not necessary to provide special insulation.

And so on.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an example of the electrically heated heat insulating container of the present invention, and FIG. 2 is an enlarged schematic sectional view of the bottom of FIG. 1,
FIG. 3 is a schematic sectional view showing another example of the electrically heated insulating container of the present invention, FIG. 4 is a schematic sectional view showing a measuring container, and FIG.
FIG. 1 is a schematic sectional view showing a conventional electrically heated heat insulating container. 9 ... inner bottle, 11 ... outer bottle, 14 ... void.

Claims (1)

[Scope of utility model registration request] 1. A double-walled structure container in which an inner bottle and an outer bottle are joined at a mouth portion with a space therebetween, and a space between the inner bottle and the outer bottle is heated in contact with the wall of the inner bottle. Electric equipment such as heaters and thermostats are arranged, and inorganic heat resistant insulating powder material is filled to surround the electric equipment and 10 to 1 × 10 ^-3 To
An electrically heated insulation container having a vacuum degree of rr.