JPS6238155A - Heat accumulator - 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 heat storage device that uses a heat storage material that utilizes heat of fusion and is used for heating the body and thermal treatment for relieving body pain. It is.

BACKGROUND ART Conventionally, this type of heat storage device is as shown in Fig. 4.
A heat storage pack 3 containing a heat storage material 2 is provided on one or both sides of a string-shaped or planar heater 1, and the heat storage material 2 changes its phase from solid to liquid by heating with the heater 1, stores heat, and transfers the solidification heat to the surroundings. A method has been adopted in which the heat is insulated using a heat insulating material 4 provided in the area, and the heat is gradually radiated to be used for heating purposes.

Problems to be Solved by the Invention The desired conditions for this type of heat storage device are a long heat dissipation time,
The heat storage time is short.

There is a proportional relationship between heat dissipation time and the amount of heat storage material, and there is an inversely proportional relationship between heat storage time and heater power.

Therefore, as a means to solve this problem, the method of increasing the filling amount of the heat storage material 2 and increasing the electric power of the heater 1 is taken.

Considering the purpose of use, there is a limit to the size of the heat storage device itself, so inputting a large amount of electric power to a predetermined area will cause the temperature of the heater 1 itself to become extremely high.

In this case, until the phase of the heat storage material 2 completely changes from solid to liquid, the temperature of the heater 1 itself is at a temperature that does not cause any particular problem as the heat is stored in the heat storage material 2, but after that, the temperature of the heat storage material 2 is higher than that. Since the heat storage material 2 does not store heat and reaches a saturated state, if heating is continued further, the temperature of the heat storage material 2 rises extremely quickly, exceeding the heat resistance temperature of the heat storage material 2, and destruction, that is, a supercooling phenomenon occurs.

At the same time, there was a risk of thermal deterioration of the heater itself, leading to burnout and ignition.

Furthermore, if the heat storage material 2 is made into a heat storage pack with one upper and lower heat storage pack, considerable stress is applied to the heat storage bag 3 depending on the application. Since the amount of filling per pack is large, the heat storage material 2 may easily leak out due to breakage or breakage in some cases, posing a risk of burns and the like.

The present invention focuses on the above-mentioned problems, and aims to provide a safe heat storage device that does not cause burnout or ignition due to overheating of the heater, and is free from burns due to outflow when heat storage material melts due to mechanical stress of the heat storage pack. It is.

Means for Solving the Problems In order to solve the above problems, the present invention is such that at least three layers of heat storage packs are stacked, and one heater heats the upper and lower heat storage packs.

Effect: With this configuration, the amount of heat storage material filled per bag is reduced, making it possible to suppress the amount of heat generated by the heater to a low level. Mechanical destruction and breakage can also be suppressed.

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

In FIGS. 1 and 2, string-like heaters 5 are wired in a meandering manner, and a sandwiched surface-like heater 7 is formed between the string-like heaters 5 and the laminated film 6 that can be thermocompression bonded from above and below.

The string-like heater 6 has four densely meandering zones, and the zone size is about the same as the area of the heat storage pack 8.

The heat storage pack 8 is formed into a bag using a laminated film 9 that can be bonded by thermocompression, and the latent heat storage material 1o is tightly packed in the bag under reduced pressure. This heat storage pack 8 is closely attached or adhered to the top and bottom of the four zones of the planar heater 7.

That is, eight heat storage packs 8 are used in one planar heater 7, and the amount of heat storage material 10 filled in one heat storage pack is 8.
I divided it up and made it smaller. In the experiment, the inner dimensions of one heat storage pipe 8 were 8 crn x 11 crn, which was 2° to 40°.

Further, in order to bring the heat storage pack 8 into close contact with the planar heater 7, a method was adopted in which the heat storage material 1o was melted in advance and then molded under load. In this way, the surface of the heat storage pack 8 that is not in contact with the planar heater 7 becomes smooth.

When the product thus produced is folded in half at the central portion 11 of the planar heater 7, it becomes a heat storage pack stacked in two rows and four layers as shown in FIGS. 1 and 2.

There was a gap between the two rows of heat storage packs 8, and by storing the temperature detector 17 at that position, it was possible to detect the same temperature as the heat storage packs 8. The temperature detector 17 cannot sensitively detect the temperature of the heat storage material 1o unless it shows the same temperature rise as the heat storage pack 8. In the example, left and right 2
A large spacer was provided in the middle of the row between the second layer heat storage bag 13 and the third layer heat storage bag 14.

The lower surface of the first layer 12 and the upper surface of the fourth layer 15 of the heat storage pack 8 are made of a slightly hard resin material to prevent the heat storage bag 8 from expanding and swelling when the heat storage material 10 is melted. A presser plate 18 made from a commercially available manufacturer was adhered thereto, and the entire structure was fixed with tape (not shown) or the like so as not to move.

Furthermore, the entire body is covered with a heat insulating material 19 made of foam such as urethane foam, fibrous felt, etc., and the outermost part is made of waterproof material 19 made of vinyl sheet, etc., so that it can withstand outdoor use and water exposure. Covered with bag 20.

This provides flexibility in the center of the heat storage bag, which prevents the heat storage pack from bursting due to load or breaking or breaking due to bending, and makes the heat storage device extremely resistant to being poked by objects such as bottles or knives. did it.

Although not shown in the figure, lead wires, power cords, etc. for connecting heater wires, temperature detectors, etc. are also appropriately wired.

Next, the operation of this heat storage device will be explained based on FIG. When the power is turned on, the planar heater 7 generates heat, which is gradually transferred to the heat storage pack 8 and the heat storage material begins to melt.

Since the filling amount in the heat storage pack 8 is small, heat is transferred extremely efficiently.

According to an experiment, when one pack of heat storage material 10 was 20y, the entire heater was set at 30W, and the entire heat storage bag 8 reached point a, 60'C, in about 30 to 40 minutes. Approximately 70-8 when 4oy
Reached point a in 0 minutes.

Furthermore, it was found that the melting speed of the second and third layers in FIG. 1 was faster than that of the first and fourth layers of the heat storage pack, and the melting rate was approximately 10 minutes.

This means that if the filling amount of the heat storage material 10 in the heat storage pack 8 corresponding to the second and third layers is appropriately larger than that in the first and fourth layers, the balance can be maintained and the heat storage time can be further shortened. I can do it.

Next, the temperature of the heat storage material 1o rises from a to b. This rise is a saturated state for the heat storage material 10, and the temperature rises rapidly because no more heat is stored.

Since this speed is proportional to the power of the heater, it is desirable to reduce the power in this case, but at point b, a temperature sensor such as a thermostat is activated and the 0-0FF cycle is repeated, so the heat storage material 10 does not exceed the heat-resistant temperature.

The heat dissipation of the heat storage material 1o starts from the 0 point where the current supply is stopped, but at the beginning, the heat is dissipated by sensible heat, and the temperature reaches about 52
At point d in the vicinity of .degree. C. to 66.degree. C., the heat storage material 10 begins to solidify and radiates latent heat. In the example, since the material of the heat storage material 10 was sodium acetate trihydrate, the amount of latent heat was 60 cal/p, so the total amount was 160 y to 32 y.
At 0y, the amount of heat storage is approximately 9.6 Kcal -19.2
It is Kcal.

A heat storage device was obtained that could withstand use for about 3 to 6 hours at a surface temperature of about 40'C.

As for the heat radiation time, if the amount of heat storage material is constant, it can be determined by the heat radiation area and the thermal conductivity of the insulation material. Therefore, if you use vacuum insulation material or fluorocarbon gas insulation material, which has extremely low thermal conductivity, the heat storage material will be thinner and last longer. You can get the equipment.

In the above embodiment, the heat storage pack 8 has four layers, but the same applies to three layers, and the filling amount of the heat storage material 1° is as follows:
The middle layer heat storage material 13.14 is the outermost heat storage material 12.15
It was found that the variation in heat storage time is smaller when the number is greater than the sum of .

Further, in the above embodiment, sodium acetate trihydrate was used as the heat storage material 10, but other materials such as hydrated salt heat storage materials and organic materials such as paraffin and naphthalene may also be used.

The heat storage pack 8 is divided into 8 pieces to make it easy to bend and fit around the body depending on the usage situation, but it may be constructed as a continuous heat storage pack.

Effects of the invention By stacking at least three layers of heat storage banks and configuring the upper and lower heat storage packs to be heated by one heater,
The temperature of the heater can be kept low, reducing the risk of burnout, ignition, etc. due to thermal deterioration of the heater itself. In addition, the amount of heat storage material to be filled in each heat storage pack is small, allowing for efficient heat storage, and is a safe heat storage device that prevents damage to the heat storage pack due to mechanical stress and burns caused by the leakage of melted heat storage material due to breakage, etc. can be provided.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a heat storage device according to an embodiment of the present invention;
FIG. 2 is an exploded perspective view showing the internal structure of the same embodiment, FIG. 3 is a temperature characteristic diagram of the heat storage material of the same embodiment, and FIG. 4 is a sectional view of a conventional heat storage device. 5... String heater, 6... Laminated film (for heater), 7... Planar heater, 8...
... Heat storage pack, 9 ... Laminated film (for bank), 10 ... Heat storage material, 17 ... Temperature sensing body, 18 ... Pressing plate, 19...Insulation material, 2Q...Waterproof bag. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Between the ends - /---Heater Figure 4 2-For I? ! :, Material 3-11 Island 75 Nogutsuku 4-tl*M

Claims (4)

[Claims] (1) A heat storage device having a structure in which at least three layers of heat storage packs are stacked and one heater heats the upper and lower heat storage packs. (2) The heat storage device according to claim 1, wherein the amount of heat storage material filled in the heat storage pack between the upper and lower heat storage packs is larger than that of the upper and lower heat storage packs. (3) The heat storage pack is stacked in four layers, and a heater is interposed between the first layer and the second layer and between the third layer and the fourth layer from the bottom. The heat storage device described. (4) The heat storage device according to claim 3, wherein a temperature sensor is provided between the second layer and the third layer.