JPS6013877A - Thermal energy storage device - Google Patents

Abstract

PURPOSE:To provide a thermal energy storage device capable of releasing the stored thermal energy smoothly, by coating an electric heater with a porous substance having cushioning property and flexibility and containing a nucleation agent, etc., and putting the electric heater into a flexible container containing a thermal energy storage material capable of storing and releasing thermal energy by the cycle of freezing and melting. CONSTITUTION:A thermal energy storage material 2 such as sodium acetate trihydrate, etc. and an electric heater 4 coated with a synthetic resin 3 (e.g. polyvinyl chloride resin) and a porous substance 100 having cushioning property and flexibility (e.g. foamed polyethylene), are put into a flexible container 4 made of e.g. soft polyvinyl chloride resin, etc. to obtain the objective thermal energy storage device. The porous substance 100 contains a nucleation agent 6 such as sodium pyrophosphate, a thickener 7 such as sodium polyacrylate, and a substance 8 having high thermal conductivity, such as aluminum powder. EFFECT:The nucleation agent, thickener and heat-conductive substance can be maintained in the device for a long period. The decrease in the effective heating density (W/m<2>) of the electric heater and the deviation of the heater from the center of the device can be prevented. USE:Body warming, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat storage body used for body warming using an electric heater.

Structure of conventional example and its problems In this type of conventional heat storage body, as shown in FIGS. 1 and 2, a flexible container 1 is filled with a heat storage material 2 such as hydrated salt. An electric heater wire 4 coated with a resin 3 or the like was provided in the center thereof.

In addition, in order to prevent overcooling and phase separation, which are inherent drawbacks of the heat storage material 2, a fibrous substance 5 made of synthetic resin, metal, etc. is mixed into the heat storage material 2, and a nucleating agent 6. Thickener 7.
A good thermally conductive substance 8 was retained as required. In this configuration, since the retention of the fibrous material 6 itself is incomplete, the nucleating agent 6. Thickener 7. The good heat conductive substance 8 had a problem in that heat could not be released smoothly because it sedimented and separated downward. This is because the crystals of the heat storage material 2 grow using the heat-dissipating nucleating agent 6 as a nucleus, but the above-mentioned 1-
When the nucleating material 6 settles and separates, crystals of the heat storage material 2 are generated in that part. This is due to the fact that it cannot be used effectively. In addition, in the configuration in which the electric heater wire 4 is provided inside the container 1, in order to heat the designed amount of the heat storage material 2 within a unit time, the normal - heater output (W
/m = + or W/m) becomes large, and the thermal conductivity of the solid phase of the heat storage material 2 is generally low, and the eccentricity of the electric heater wire 4 due to external stress such as load and bending, and the accompanying damage to the container. Considering the contact with 1, there was a problem in that the heat retaining effect caused the area to reach an abnormally high temperature, causing disconnection of the electric heater wire 4 and damage to the container.

OBJECTS OF THE INVENTION The present invention solves these conventional problems and aims to provide a heat storage body that is safe and can smoothly release heat.

Structure of the Invention In order to achieve this object, the present invention provides a flexible container containing a heat storage material that transfers and receives heat through repeated solidification and melting, and is coated with a porous material having cushioning and flexibility. The porous material is provided with an electric heater wire, and at least one of a nucleating agent, a thickening agent, and a good thermal conductive material is interposed in the porous material.

This structure reliably retains the nucleating agent, thickener, good thermal conductivity substance, etc. for a long period of time, reduces the effective heating density (W/ml) of the electric heater wire, and prevents eccentricity of the electric heater wire. DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. In Figures 3 and 4, polyvinyl chloride (
In a flexible container 1 such as a soft material, a heat storage material 2 such as sodium acetate trihydrate, foamed polyethylene,
A porous material 100 having cushioning properties and flexibility such as foamed polypropylene and an electric heater wire 4 covered with a synthetic resin 3 such as polyvinyl chloride are filled and attached.

Further, within the porous material 100, a nucleating agent 6 such as sodium pyrophosphate, a thickening agent 7 such as sodium polyacrylate,
A material 8 with good thermal conductivity such as aluminum powder is retained.

Note that the same members as in FIGS. 1 and 2 are given the same numbers. Although the heat storage body is shown in a tube shape in FIGS. 3 and 4, it may be in a sheet shape.

In the above configuration, during heat storage (when electric heater 4 is energized)
Thermal energy from electric heater 4 is transferred to synthetic resin 3. The heat is transmitted to the heat storage material 2 via the porous material 100. that time,
Since heat is transferred to the heat storage material 2 directly from the wide surface of the porous material 1oo or via the good heat conductive material 8 held inside, the effective heating density of the electric heater wire 4 ("
/rr11) can be reduced. In this way, when the heat storage is completed, the inside of the container 1 is filled with the melt of the heat storage material 2. Heat dissipation starts immediately after the electric heater wire 4 is energized.

The nucleating material 6 is uniformly dispersed and held in the porous material 100, and when the heat storage material 2 is cooled below its melting point, the nucleating material 6 is
The crystals of the heat storage material 2 start to grow throughout the interior of the container 1 with the crystals as a core, and at the same time, the latent heat of fusion is released. The released heat is transmitted to the body using the entire outer surface of the container 1 as a heat transfer surface.

In addition, the porous material 10 resists external stress such as load and bending.
0 serves as a cushion and at the same time can always hold the electric heater wire 4 in the center of the container 1.

In the above embodiment, the electric heater wire 4 is made of synthetic resin 3. Although it was used by being coated with a porous substance 100, it may also be used by directly coating it with a porous substance 1oo.

The wire 4 and the porous material 100 are bonded using an adhesive.

Heat fusion, either case is fine. Furthermore, porous material 1
00゛ is a pre-formed foamed resin or a fibrous material such as synthetic fiber or metal fiber, and a nucleating agent is placed inside it.6. Any material may be used as long as it has a gap in which the thickener 7, etc. can be attached. Alternatively, a thick coating resin layer may be provided and chemically etched.

Effect of the invention According to the heat storage body of the present invention, the following effects can be obtained.

(1) Nucleating agents, thickeners, good thermal conductive substances, etc. are uniformly dispersed and retained in the porous material integrated with the electric heater wire, allowing stable heat storage and radiation over a long period of time. It can be done smoothly.

@) Effective heating density of electric heater wire by porous material (
W/ms) and by preventing eccentricity of the electric heater wire, abnormal heating can be prevented and safety can be improved.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of a conventional heat storage body, FIG. 2 is a side sectional view of the same, FIG. 3 is a front sectional view showing an embodiment of the heat storage body of the present invention, and FIG. 4 is a side sectional view of the same. 0 1... Container, 2... Heat storage material, 4...
...Electric heater wire, 6... Nucleating agent, 7...
... Thickener, 8 ... Good thermal conductive substance, 10
0... Porous material. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure M4

Claims (1)

[Claims] An electric heater wire coated with a porous material having cushioning properties and flexibility is provided in a flexible container containing a heat storage material that transfers and receives heat through repeated solidification and melting. A heat storage body in which at least one of a nucleating agent, a thickening agent, and a good heat conductive substance is interposed.