JPS61105098A - Heat accumulating container and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain the heat accumulating container having sufficient heat conductivity and excellent mechanical strength by a method wherein a heat accumulating material is enclosed in the heat accumulating container made of synthetic resin, the outer surface of the container is surrounded with close adhesion of a metal plate or a metal body. CONSTITUTION:A heat accumulating material is enclosed in a cylindrical body made of plastic of a heat accumulating container 1, the outer periphery surface of the heat accumulating container 1 is wound by a sheet of metal plate 4 so that the outer surface is surrounded with close adhesion of the metal plate. The winding work is performed as follows, that is, the heat accumulating cylindrical body 1 made of plastic is inserted into a die 6 in the manner that the outer surface of the cylindrical body is surrounded with the metal plate 4, then the cylindrical body is drawn out of the die while being wound by the metal plate, thus, the winding work can be performed securely and in a short time. The thickness of the metal plate 4 is pref. more than 0.5mm with regard to both the heat conductivity and the strength. A groove 5 is left after winding work, the groove 5 is pref. as narrow as possible.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a heat storage container and a method for manufacturing the same, and in particular, to a heat storage container made of a synthetic resin that encloses a heat storage material therein and is suitable for improving the thermal conductivity of the heat storage container. The present invention relates to a heat storage container and a method for manufacturing the same.

[Background of the invention]

First, a conventional heat storage container will be explained with reference to FIG.

FIG. 4 is a longitudinal sectional view of a conventional heat storage container.

A heat storage material 2 such as polyethylene glycol or sodium sulfate decahydrate is enclosed in a heat storage container l made of a plastic cylinder such as polyethylene or vinyl chloride, which is a synthetic resin.

This heat storage container is used to store heat in the heat storage material 2 via the plastic heat storage container 1, or to extract heat from the heat storage material 2.

Such a heat storage container 1 may be used not only as a single container, but also as a plurality of containers.

Further, as the heat to be stored, solar heat, factory exhaust heat, etc. are used.

When storing heat in the heat storage material 2 in such a heat storage container 1, it is good to uniformly heat the outer surface of the heat storage container 1 in terms of heat transfer and materials. Sometimes. For example, when the heat storage container 1 is directly heated by solar heat, the upper surface side that receives sunlight becomes high temperature, and the temperature of the lower surface side hardly increases.

This is because the heat storage container 1 is made of non-thermally conductive glass, and it takes a considerable amount of time to store heat.

Furthermore, when a latent heat storage material such as sodium sulfate decahydrate is used as the heat storage material 2, it separates into two components with different melting points, and the latent heat cannot be stably released at a desired temperature.

Generally, in such a case, components with a round melting point gather in the upper part of the heat storage container 1, and components with a high melting point gather in the lower part.

Although the plastic heat storage container 1 is corrosion resistant to the heat storage material 2 as described above, it has the above-mentioned problems.

For this reason, as a method to solve this problem, JP-A-57-1
Japanese Patent No. 88990 describes a heat storage body made of a synthetic resin in which a heat storage material is sealed, and the outer surface of the heat storage body is coated with a thin metal film. In FIG. 4, 3 is the metal thin film.

However, the thickness of the metal thin film 3 is approximately 10 μm to 100 μm, and insufficient consideration is given to transmitting the heat received on the upper surface of the heat storage container 1 to the lower surface. No fundamental solution has been found. For example, the amount of heat received by the outer surface of the heat storage container 1 per unit area and per unit time is 35
When the outer surface of the heat storage container 1 with an outer diameter of φ100 is coated with a thin aluminum film of the above thickness at 0 kcat/m 2 h, the temperature difference from the top surface to the bottom surface of the heat storage container a1 is 10
The value will rise significantly above 0C.

If such a large temperature difference occurs, the objectives such as shortening the heat storage time, improving heat transfer properties, and alleviating the two-phase separation phenomenon of the heat storage material cannot be sufficiently achieved.

In addition, the metal thin film 3 has low mechanical strength and may be damaged or damaged.
There was a problem that it could not sufficiently withstand external loads.

[Purpose of the invention]

The present invention has been made in order to solve the above-mentioned problems of the prior art, and provides a method for manufacturing heat storage containers 62 and 7 that have good thermal conductivity and excellent mechanical strength.
That is the purpose.

[Summary of the invention]

The structure of the heat storage container according to the present invention is such that a metal plate or a metal body is tightly surrounded on the outer surface of a synthetic resin heat storage container that encloses a heat storage material inside.

In addition, the method for producing a heat storage container according to the present invention includes plastic processing of the metal or plastic processing of the synthetic resin heat storage container in which a metal plate or a metal body is surrounded on the outer surface of the synthetic resin heat storage container that encloses a heat storage material inside. By press-fitting the container, both the synthetic resin heat storage container and the metal plate or metal body are brought into close contact.

In addition, the present invention involves wrapping a metal plate around the outer surface of a plastic heat storage container, or press-fitting the plastic heat storage container into a long extruded metal body,
In addition to improving thermal conductivity, it also improves heat transfer by providing recesses, fins, etc. on the outer surface of the metal plate and metal body, improving mechanical strength and making it easier to stack a large number of heat storage containers. .

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 through 3 and FIGS. 5 through 17.

First, FIG. 1 is a longitudinal sectional view of a heat storage container according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA' in FIG. It is an explanatory diagram showing a manufacturing method. In the figure, the same reference numerals as those in FIG. 4 are the same parts as those in the prior art, so the explanation thereof will be omitted.

As shown in Fig. 1.2, the heat storage container of this embodiment is a heat storage container (
A metal plate 4 is wrapped tightly around the outer peripheral surface of the heat storage cylinder 1 (hereinafter referred to as a plastic heat storage cylinder).

This winding can be done by surrounding the metal plate 4 around the outer periphery of the plastic heat storage cylinder 1, and wrapping it firmly and quickly by placing it in a die 6 and pulling it out as shown in Fig. 3. can be wrapped securely.

The thickness of the metal plate 4 is preferably 0.5 mm or more in terms of both heat conductivity and strength. Reference numeral 5 indicates a groove in which the winding is carried out at the rear, and it is better to make this groove 5 as narrow as possible.

According to the heat storage container having such a configuration, since a metal plate having good heat conductivity is wrapped around the outer periphery of the plastic heat storage container having poor heat conduction, the following effects can be obtained.

(1) The thermal conductivity of the heat storage container is good, and the heat storage time can be shortened.

(2) Heat conductivity between the inner and outer surfaces of the heat storage container is improved, and uniform temperature distribution can be obtained.

(3) The two-phase separation phenomenon of heat storage materials can be alleviated.

(4)° The mechanical strength of the heat storage container is improved.

Next, FIG. 5 is a longitudinal sectional view of a heat storage container according to another embodiment of the present invention, and FIG. 6 is a side view thereof. In the figure, the same reference numerals as in FIG. Therefore, its explanation will be omitted.

In this embodiment, the inner diameter of the metal plate 4A to be formed into a pipe shape is made in advance to be slightly larger than the outer diameter of the plastic heat storage cylinder 1, and as shown in FIG. The metal plate 4At- is reduced in diameter and brought into close contact with the outer periphery of the plastic heat storage cylinder 1.

As shown in FIG. 5, the end of the pipe-shaped metal plate 4A is bent in the radial direction of the outer end of the plastic heat storage cylinder 1 like a bent part 4b, and the pipe is attached to the plastic heat storage cylinder 1. The shaped metal plate 4A is firmly fixed.

Next, an example in which the heat storage container is in the shape of a rectangular parallelepiped is shown in FIGS. 7 to 9.
This will be explained with reference to the figures.

In particular, FIG. 7 is a longitudinal sectional view of a heat storage container according to still another embodiment of the present invention, FIG. 8 is a sectional view taken along line BB' in FIG. FIG. 2 is a cross-sectional view of a stack of heat storage containers.

As shown in FIG. 8.9, in this embodiment, a metal plate with a rectangular cross section is attached to the outer surface of a plastic rectangular parallelepiped heat storage container (hereinafter referred to as a plastic heat storage rectangular parallelepiped) that encloses the heat storage material 2 inside. 4B is tightly surrounded.

As for its manufacturing method, as shown in FIG. 3, the metal plate 4B having a rectangular cross section is reduced in size using a die 6 and brought into close contact with the plastic heat storage rectangular parallelepiped IB. Conversely, the heat storage rectangular parallelepiped IB is molded from soft plastic, and the metal plate 4 of the hollow rectangular parallelepiped metal plate structure is
It may be press-fitted into the hollow part of B and brought into close contact.

This hollow rectangular parallelepiped metal plate 4B can be formed by extrusion molding.

It is also possible to provide seven fins as shown in the figure on the outer surface of the metal plate 4B. Providing such fins 7 is convenient for stacking a plurality of plastic heat storage rectangular parallelepipeds IB as shown in FIG. 9. In other words, the fins 7 not only improve the heat conductivity of the heat storage container, but also form a space 8 having a predetermined distance between the fins 7 and the adjacent metal plate 4B.

This space 8 can be used as a passage for fluid.

According to this embodiment, the same effects as the above-described embodiment shown in FIG. 1 can be expected, and there is also a unique effect that a plurality of heat storage containers can be easily connected and stacked.

Next, an example of a special shaped heat storage container will be explained with reference to FIGS. 10L9 to 14.

Here, FIG. 10 is a perspective view of a heat storage container according to still another embodiment of the present invention, and FIG. 11 is a sectional view taken along line CC' in FIG. 10.

The heat storage container shown in FIG. 10 is made by plastically working a soft plastic heat storage container IC with a circular cross section and a metal plate 4C that tightly surrounds it so as to crush it from both sides to form a recess 9 as shown in the figure. This is what I did.

According to this embodiment, the same effects as the embodiment shown in FIG. 1 can be expected, and in particular, the heat conductivity of the inner and outer surfaces of the heat storage container can be improved.

Even if the plastic heat storage container IC is soft,
Even if the metal plate 4C is wound around the heat storage container to provide a curved portion 9 as shown in the figure, the heat storage container can reliably maintain its shape due to the metal plate 4C.

FIG. 12 is a sectional view of a specially shaped heat storage container according to still another embodiment of the present invention.

The heat storage container shown in FIG. 12 is obtained by deforming the heat storage container, which initially had a circular cross section, by plastic working, and further increasing the number of recesses 10 to four, thereby further improving heat conductivity.

ID is a heat storage container made of soft plastic, and 4D is a metal plate that tightly surrounds the heat storage container ID, similar to the example in FIG. 11.
Complex shapes can be held reliably by the metal plate 4D.

FIG. 13 is a sectional view of a heat storage container according to still another embodiment of the present invention.

In the embodiment shown in FIG. 13, a plurality of cylindrical plastic heat storage containers 11 are integrally connected.
indicates the joint. Even in such a case, the metal plate 14
As shown in the figure, the heat transfer properties can be improved by closely contacting the outer surface of each heat storage container 11 using a special die.

The outer surface of the joint 12 forms a recess 15, and as in the embodiments shown in FIGS. 10 and 12, the heat conductivity of the inner and outer surfaces of the heat storage container can be improved.

FIG. 14 is a perspective view of a heat storage container according to still another embodiment of the present invention.

In the embodiment shown in FIG. 14, a plurality of pipe-shaped metal plates 16 are integrally connected by ribs 17 made of the same metal as shown in the figure, and a plastic material is inserted into the pipe-shaped metal plates 16. A manufactured heat storage cylinder 1 is press-fitted therein.

The pipe-shaped metal plate 16 integrally connected with such a lip 17 can be manufactured by extrusion molding.

According to each of the embodiments shown in FIGS. 10 to 14, the same effects as those described in the embodiment shown in FIG. By using the metal plate tightly surrounding the outer periphery of the soft plastic heat storage container, the outer surface shape can be shaped into a suitable shape, which has the effect of making it convenient for practical use.

Next, an embodiment in which a plurality of plastic heat storage containers are press-fitted into a metal body will be described with reference to FIGS. 15 to 17.

First, FIG. 15 is a perspective view of a heat storage container body using a metal body according to still another embodiment of the present invention.

In the embodiment shown in FIG.
A plurality of circular holes are bored in the 0, and a plastic heat storage cylinder 1 enclosing a heat storage material 2 therein is press-fitted into the holes to form a heat storage container body.

A heat storage container body having such a configuration is expected to have the same effects as those explained in the embodiment shown in FIG. The benefits are large.

Moreover, FIG. 16 is a perspective view of a heat storage container body using a metal body according to still another embodiment of the present invention.

In the embodiment shown in FIG. 16, a plurality of rectangular holes are bored in the metal body 20B, and a heat storage rectangular parallelepiped made of plastic with the heat storage material 2 sealed therein is press-fitted into the holes to form a heat storage container body. has been done.

In the case of this example, exactly the same effect as in the example of FIG. 15 is expected.

FIG. 17 is a perspective view of a practical example of the heat storage container shown in FIG. 15. In the figure, parts with the same reference numerals as those in FIG. 15 are equivalent parts, so a description thereof will be omitted.

The embodiment shown in FIG. 17 is an application of the heat storage container shown in FIG. 15 to a solar heat collector, and a pipe 21 is attached to the back surface of the metal body 20.

During the day, the sun hits the surface of the metal body 200 and heat is stored in the heat storage material 2 inside the glass heat storage cylinder 1, and at night, the pipe 21
It has the function of passing a heat exchange medium, such as water, through it and extracting hot water.

The pipe 21 may be integrally formed on the back surface of the metal body 20 by a roll bonding method.

In each of the above embodiments, by roughening the inner surface of the metal plate or the inner surface of the hole in the metal body that surrounds the plastic heat storage container a, or by providing a large number of fine grooves, the heat storage container can be firmly attached to them. Easier to fix.

In the above-mentioned embodiment, regarding the formation of fins on the outer surface of the metal plate, an example was explained in which the fins 7 were provided on the metal plate 4B surrounding the plastic heat storage rectangular parallelepiped IB shown in FIGS. 7 to 9. It goes without saying that the invention is not limited to this, and fins may be provided on the outer surface of metal plates or metal bodies of other shapes as long as the same effect can be expected.

Similarly, regarding the bending of the end of the metal plate, the metal plate 4 is
Although the example of bending the end of a person has been described, the present invention is not limited to this, and it goes without saying that it can be applied to metal plates or metal bodies of heat storage containers of other shapes as long as the same effect can be expected. do not have.

〔Effect of the invention〕

As described above, according to the present invention, thermal conductivity is good and
Moreover, it is possible to provide a heat storage container with excellent mechanical strength and a method for manufacturing the same.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a heat storage container according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line A' in FIG.
4 is a longitudinal sectional view of a conventional heat storage container, FIG. 5 is a longitudinal sectional view of a heat storage container according to another embodiment of the present invention, and FIG. is a side view thereof, FIG. 7 is a longitudinal sectional view of a heat storage container according to still another embodiment of the present invention, FIG. 8 is a BB' sectional view of FIG. 7, and FIG. Cross-sectional view of the stacked heat storage containers shown in Figure 8, No. 10
The figure is a perspective view of a heat storage container according to still another embodiment of the present invention, FIG. 11 is a sectional view taken along line cc' in FIG. 10, and FIG. FIG. 13 is a cross-sectional view of a heat storage container with a special shape, FIG. 13 is a cross-sectional view of a heat storage container according to still another embodiment of the present invention, and FIG. 14 is a perspective view of a heat storage container according to still another embodiment of the present invention. Figure, Figure 15, Figure 16
17 is a perspective view of a practical example of the heat storage container shown in FIG. 15, and FIG. 17 is a perspective view of a practical example of the heat storage container shown in FIG. 15. 1...Glassic heat storage cylinder, IB...Plastic heat storage rectangular parallelepiped, IC, ID...Plastic exhibition heat storage container, 2...Heat storage material, 4,4A, 48.4G. 14.16...Metal plate, 4b...Bending portion, 6.
... Dice, 7°°° fin, 9, 10.15... Recess, 11... Plastic heat storage container, 17...
Reply, 20゜￥;/ρ figure ￥:, 11 figure 74 figure 15 figure 16 figure Z Noah figure-! ':, 2Q-

Claims (1)

[Scope of Claims] 1. A heat storage container, characterized in that a metal plate or a metal body is tightly surrounded on the outer surface of a synthetic resin heat storage container that encloses a heat storage material inside. 2. In the product described in claim 1, the metal plate or metal body is fixed to the synthetic resin heat storage container by bending the end of the metal plate or metal body to the outer end of the synthetic resin heat storage container. A heat storage container. 3. A heat storage container according to claim 1 or 2, which is a metal plate or a metal body with fins provided on the outer surface thereof. 4. A heat storage container according to any one of claims 1 to 3, which is a heat storage container surrounded by a metal plate or a metal body and has a recessed portion for increasing thermal conductivity. . 5. In any one of claims 1 to 4, a plurality of synthetic resin heat storage containers surrounded by a metal plate or a metal body are connected through the metal of the metal plate or metal body. A heat storage container that is integrally connected. 6. By plastic working the metal or press-fitting the synthetic resin heat storage container with a metal plate or metal body surrounding the outer surface of the synthetic resin heat storage container that encloses the heat storage material inside,
A method of manufacturing a heat storage container, characterized in that both the synthetic resin heat storage container and the metal plate or metal body are brought into close contact with each other. 7. In the method described in claim 6, the inner surface of the metal plate or the inner surface of the hole of the metal body to surround the synthetic resin heat storage container is roughened or formed with a large number of fine grooves. Method of manufacturing the heat storage container used. 8. In either of the methods described in claim 6 or 7, the inner diameter of the metal plate to be formed into a pipe shape is manufactured in advance to be larger than the outer diameter of the synthetic resin heat storage cylinder,
The pipe-shaped metal plate surrounds the synthetic resin heat storage cylinder, and is pulled out with a die device to reduce the diameter of the pipe-shaped metal plate, and the ends of the pipe-shaped metal plate are A method of manufacturing a heat storage container, wherein the heat storage cylinder is bent in the radial direction of the outer end of the synthetic resin heat storage cylinder and brought into close contact with the outer end.