JPS6077389A - Heat accumulation type electric heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a regenerative electric heater used in a space heater or the like.

Conventional configurations and their problems Traditionally, electric heaters embedded in heat insulating materials have been commonly used as local heaters for the human body, etc. However, with these conventional electric heaters, the power cord is always required. Ash,
The spatial usage range of the heater is limited to the length of its power cord.

In recent years, there has been a demand for a heater that has a heating function for a certain period of time even after the power to the electric heater is turned off, and this requires the development of a regenerative electric heater. In addition, such a heat storage type electric heater is required to be lightweight, flexible, short in heat storage time (high heat storage efficiency), high in safety, and low in cost. On the other hand, the conventional latent heat storage method has a configuration in which a latent heat absorber is housed in a robust heat storage tank, and a heating source such as an electric heater is buried in the latent heat storage side of the I/C. There were problems in weight, flexibility, cost, etc. when adopting this conventional latent heat storage method as a heat storage method for the above-mentioned heater.

Purpose of the Invention The purpose of the present invention is to provide an electric heater for use in heaters, heat insulators, etc. using a latent heat storage method, which is lightweight, flexible, has high heating (heat storage) efficiency, high safety, and low cost. Our goal is to provide the following.

Structure of the Invention The basic structure of the present invention is that at least one sealed container containing latent heat storage material made of metal foil, plastic, or metal foil/plastic laminate film is placed on the surface of a planar or ribbon-shaped electric heater. The electric heater has a reat which is arranged in close contact with the electric heater and is capable of energizing the heating element of the electric heater from an external power source. However, for the above planar or ribbon electric heaters, the electrically insulated wire or planar heating element may be replaced with metal foil, plastic,
Alternatively, it is sandwiched and surrounded by metal foil or plastic laminated film. Electric heaters with such a configuration are lightweight, flexible, have excellent chemical resistance and water resistance, are highly safe, have a relatively uniform temperature distribution when heating heat storage materials, and have It is characterized by high efficiency and low cost. The material used for the sealed container that stores latent heat storage is metal foil or glass.

Alternatively, it is a metal foil/plastic laminate film, which is also lightweight, flexible, chemical resistant, and water resistant.

It has excellent features in terms of safety and cost.

On the other hand, latent heat storage materials are solid below their solidification temperature, but most of the solids are granular or acicular, and the thickness of the a-thermal storage material is adjusted to an appropriate thickness (for example, U number).

(below), the regenerative electric heater of the present invention has sufficient flexibility.

The structure of the present invention is that the metal foil constituting the above-mentioned sealed container,
It is characterized in that a part of the plastic or metal foil/plastic laminate film is used in common with the metal foil, glass 1, or metal foil/glass laminate film surrounding the heating element. With this configuration, the heat emitted from the heating element is quickly transferred to the latent heat storage material through the foil and film of the common portion.

That is, heating (heat storage) efficiency is improved. Furthermore, by using the same foil and film, weight and cost reductions can be achieved.

Furthermore, the structure of the present invention is such that, in the above-mentioned sealed container, the opposing walls are bonded to each other at appropriate locations. Due to the existence of such a bonded portion, the thermal storage type electric heater of the present invention has sufficient flexibility, especially in the bonded portion, and
In addition, it prevents unevenness caused by the gravity of latent heat absorption in the flexible dense-moon garbage container, and maintains a more uniform heating state on the latent heat storage side by the planar or ribbon-shaped electric heater. It has the effect of increasing (heat storage) efficiency.

Further, in the configuration of the present invention, the connecting portion between the heating element and the lead wire maintains thermal contact with the latent heat storage material via the foil and film surrounding the heating element. With this configuration,
This has the effect of preventing unrestricted heating of the heating element (uneven surface temperature of the heating element), extending the life of the planar or ribbon electric heater, and increasing safety. .

Description of Examples Example 1 A latent heat storage type electric heater as shown in FIG. 1 was prototyped. 1
1 is a linear heating element, which is made of copper alloy wire electrically insulated with polyethylene and has an outer diameter of 3 mm and a length of 20 mm.
A heater wire with oQn and power consumption of 10oW (applied voltage of 100cm) was used. Lead wires 12 were connected to both ends of the linear heating element 11.

The lead wire 12 was electrically insulated and covered with polyethylene, and the connecting portion 13 between the heating element 11 and the lead wire 12 was also electrically insulated and covered with polyethylene. 14 is a metal foil surrounding the heating element. Here the length is 34cnI + li'J 2
6 CTn, 30 μm thick stainless steel foil was used.

Two sheets of this stainless steel metal foil are used, and a heating element 1 is placed between them.
1 and the lead wire 12 were inserted, and the surface J was bonded with a thermal adhesive, and LJI was determined as shown in FIG.

Here, the connecting portion 13 between the heating element 11 and the lead wire 12 exists inside the two metal foils 14 bonded together. In this way, the linear heating element 11. A planar electric heater consisting of 12° lead wires and metal foil 14 was obtained. Next, 16 is a sealed container made of plasti or Kufilm that stores the latent heat storage material, and the internal volume of the sealed container (d length 36 cm x width 25 Cr
n×average thickness 2.5N.

After 250 y of latent heat storage material 16 was packed into this container, the plastic film container was sealed by thermocompression bonding. Two identical sealed containers 15 containing the latent heat storage material 16 were made, and as shown in FIG. 1, they were brought into close contact with both sides of the sheet electric heater. Here, the connecting portion 13 between the heating element 11 and the lead wire 12 was kept in thermal contact with the latent heat storage material 16 via the metal foil 14 and the plastic film 15. The latent heat storage material 16 used here is sodium acetate trihydrate containing 1% by weight of sodium pyrophosphate decahydrate as a supercooling inhibitor. The melting point of this latent heat storage material 16 is 68°C, the freezing point is 53°C2, and the latent heat of melting and solidification is 60°C.
cal/7, the average specific heat of the solid is 0.3 cal/
fC, the specific heat of the liquid is o, 7 cal/y'c. Therefore, the recommended outside air temperature level is 10″C1 and the heat storage temperature level is 65°.
When set to C, the heat storage capacity of this regenerative electric heater is the sum of latent heat amount 301 m1 and sensible heat amount 9.7 &/ 39.7+h
/, and since the heater power is 100 W, the time required to store that amount of heat in an adiabatic state is about 28 minutes.

Next, this regenerative electric heater can be used as a heater for an electric vest, which is one type of local heater. As a result of embedding this heat storage type heater in the thermal insulation phase of the vest,
When the power is turned on, the vest enters the heat retention state (20W heat dissipation), and the temperature of the latent heat storage material reaches the set temperature of 65°C within 35 minutes after the power is turned on. It was possible to maintain the heat retention state (2oW heat dissipation) for 38 minutes.

Conventional electric vest (heater power is 20'W for comparison)
) can maintain heat retention (20W heat dissipation) when the power is turned on, but rapidly loses its heat retention function when the power is turned off. On the other hand, if the heat storage type electric heater of this embodiment (heater power 100 W, heat storage capacity 39.7 bt) is used, the heat retention function can be maintained even after the power is turned off. In other words, a power cordless system can be achieved. Moreover, this heat storage type electric heater is relatively lightweight (670y) and flexible, and the time required for heat storage is shorter than the heat radiation time (about 1/4 in the example), making the heater highly safe. , low cost,
It is highly practical.

Example 2 A latent heat storage electric heater as shown in FIG. 2 was prototyped. 2
1 is a linear heating element, and here the same heater wire as in Example 1 was used. Lead wires 2 are attached to both ends of the linear heating element 21.
2 was connected. The lead wire 22 and the connecting portion 23 between the heating element 21 and the lead wire 22 are both electrically insulated and coated with polyethylene. Reference numeral 24 denotes a metal foil/glass laminate film that surrounds the heating element, and is also used as a metal foil/glass laminate film that constitutes a sealed container for storing the latent heat storage material. 26
is a metal foil that forms a sealed container that stores the latent heat storage material.
It is a glass laminate film. here 24
The same laminate film was used for and 25. The film is polyethylene terephthalate (thickness 12 μm)/nylon (35 cm inside + 30 cm width).
We relied on a metal foil/plastic laminate film consisting of four layers: 121 layers (thickness: 121 m)/A9° foil (thickness: 9 μm)/polyethylene (thickness: 60 μm). The 15 +) ethylene sides of these two films were placed on the inside, and the peripheral parts were bonded together by thermocompression bonding, and the thermocompression bonding was carried out at the appropriate point of the film as shown in Figure 2. . Two identical sealed containers are made in which the latent heat storage cocoons 5 and 26 are housed in a film container composed of these 24 and 25, and the linear heating element 21 and the lead are placed between the two sealed containers. The wire 22 was inserted and fixed as shown in Figure 2.

A thermally conductive adhesive is used to fix the heating element 21 to the outer wall 24 of the sealed container, and a thermally conductive filler is filled in the vicinity of the heating element 21, and then the two sealed containers are bonded together. The periphery was sealed with adhesive. Here, the connecting portion 23 between the heating element and the lead wire was kept in thermal contact with the latent heat storage material 26 via the laminate film 24. The latent heat storage material 26 used here is the same as that used in Example 1. Therefore, when the outside air temperature is set to 10°C and the heat storage temperature level is set to 65°C, the heat storage capacity of this regenerative electric heater is
It is 39.7&/, which is the same as that of Example 1, and the heater power is also 10oW, which is the same as in Example 1. The heat storage type heater of this example is also Example 1
Similarly, it can be used as a heater for electric vests, can be made without a power cord, is lightweight, flexible, has high heat storage efficiency, is highly safe, low cost, and highly practical. It is something.

Example 3 We prototyped a submerged 1-ki heater as shown in Figure 3.

31 is a planar heating element, here made of nickel-based gold foil, with an area of 5 cm x 3 cm r ? 'f'! A glue heater with a power consumption of 12 W (applied voltage 25 V) was used.

Sixteen of these planar heating elements were prepared, and as shown in Figure 3, they were electrically connected in series in the length direction using Riet wires 32 to create four sets of 4 arrays. . The four sets of series bodies were further electrically connected in parallel using a Lee-1 wire 32. where the length of the leads between the series connections (equal to the distance between the heating elements in the longitudinal direction) is 5 cm -7', squirrel,
The distance between heating elements in the 4JI' direction (parallel direction) is 6cm.
It is. Next, 34 is a plastic that surrounds the heating element, and here the mesh is 45 cm in width, 33 cm in width, and 1 in thickness.
Two 00 μm polyester films were used. The heating element 31 and the lead wire 32 are sandwiched between these two polyethylene films, and the films are bonded by thermocompression bonding to form a planar electric heater (heating element 31, lead wire 32° and (consisting of a plastic shell 34 surrounding a heating element) was obtained. Next, 35 is a plastic sealed container that houses the latent heat storage container, here a hollow molded polyethylene body is used, and its shape is 6 On (in the mesh) x 4.
It is a rectangular parallelepiped (corresponding to the internal volume) of C1n (width) x 61EI+ (height). After filling 181 pieces of the latent heat storage material 36 into this rectangular parallelepiped container, the container was completely sealed. The latent heat storage material 36 used here is the same as the material used in Example 1. Thirty-two identical sealed containers made of glass containing such latent heat storage material 151 were made, and these were placed on both sides of the above-mentioned planar electric heater to cover the heat generating part with good thermal conductivity, as shown in Fig. 3. It was fixed with heat-resistant adhesive. At this time, the connection part 33 between the heating element 31 and the lead wire 32 is connected to the plastic film 34 and plastic container wall 36.
Thermal contact with the latent heat storage material 36 was maintained through the .

In this way, the regenerative electric heater shown in Fig. 3 was created. When the outside air temperature is 0°C and the heat storage temperature level is set to 65°C, the heat storage capacity of this regenerative electric heater is 1 for the amount of latent heat 34.5! The sum of the amount of sensible heat and the amount of sensible heat 12.8&/ is 47°3, and the heater power is 192W (applied voltage 10o), so the time required to store that amount of heat in an adiabatic state is about 17 minutes. .

Next, similarly to the first embodiment, this heat storage type heater is used as a heater for an electric vest. As a result of embedding this heat storage type heater in the insulation material of the vest, when the power is turned on, the tree enters the heat retention state (26W heat dissipation), and the temperature of the latent heat storage material reaches the set temperature within 20 minutes after the power is turned on. 66°C
Even if the power was turned off at this point, the heat retention state (26W heat dissipation) could be maintained for 126 minutes. In other words, a power cordless system can be achieved. Furthermore, this heat storage type electric heater is relatively lightweight (71 og), flexible, has high heat storage efficiency, high heater safety, low cost, and is highly practical.

Effects of the Invention As described above, the heat storage type electric heater of the present invention can store heat for a short time (
(e.g. within 1 hour), long-term heat dissipation (e.g. 2 hours or more)
We provide a heater that is lightweight (for example, I kg or less), flexible, highly safe, and low cost, and when used as a heater for a local heater, etc., it can be made cordless. It is what makes it possible.

[Brief explanation of drawings]

Figure 1 a, b, Figure 2 a, b, and Figure 3 a. bIi is a sectional view and a plan view, respectively, showing an embodiment of the seedling type electric heater of the present invention. 11.21・・Linear heating element, 31・・Planar heating element, 1
2, 22. 32... Lead wire, 13, 23°33
・・・Connection part between heating element and lead wire, 14, 24゜3
4...Metal foil, plastic, or metal foil/plastic laminate film surrounding the heating element, 16,
25, 36...--Metal foil for storing latent heat storage material,
Sealed container made of plastic or metal foil/fristinoclaminate film, 16°26.36...
...Latent heat storage material. Name of agent: Patent attorney Toshio Nakao and one other person Figure 2 (0-) (b)

Claims (4)

[Claims] (1) A planar or ribbon-shaped electric heater made of metal foil, plastic I, or metal foil/plastic laminate film surrounding a linear or planar heating element, and a planar or ribbon-shaped electric heater made of metal foil, plastic I, or metal foil/plastic laminate film that surrounds a linear or planar heating element, and which Metal foil, plastic, or metal foil to accommodate the latent heat storage material to be provided.
a sealed container made of plastic laminated film;
A regenerative electric heater having a lead wire that can energize the heating element using an external power source. (2) Metal foil and plastic that make up the sealed container. Or the metal foil/plastic laminate film surrounding the heating element, or the metal foil/plastic laminate film used in common with l18'g/
``The regenerative electric heater according to claim 1. (3) The regenerative electric heater according to claim 1, wherein the sealed container has opposing walls bonded to each other at appropriate locations. (4) Connect electrically insulated lead wires to both ends of the heating element, and connect the connecting parts of both ends to the metal foil surrounding the heating element.
2. The regenerative electric heater according to claim 1, which is brought into thermal contact with a latent heat storage material via plastic or metal foil/plastic laminate film.