JPH08145581A - Heat accumulator - Google Patents

Abstract

PURPOSE: To obtain a heat accumulator, prominent in temperature keeping effect as well as the resistance to corrosion and strength of a heat accumulating material, with a low cost. CONSTITUTION: A heat accumulator is constituted of a three-layer structure consisting of an outermost cylinder 21, an outer cylinder 22 and an inner cylinder 23. A space between the outermost cylinder 21 and the outer cylinder 22 is evacuated while the other space between the outer cylinder 22 and the inner cylinder 23 is the layer of thermal storage medium such as barium hydroxide 8-water salt (Ba(OH)2 .8H2 O) and the like, for example. The outermost cylinder 21 is kept as a vacuum layer whereby the temperature of liquid substance in the inner cylinder 23, heated by the latent heat of melting of the thermal storage medium, can be kept for a long period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage device that utilizes latent heat released when a heat storage material cools.

[0002]

2. Description of the Related Art FIG. 2 shows, for example, JP-A-02-169994.
It is sectional drawing which shows the conventional heat storage device shown by the publication.
In the figure, reference numeral 1 denotes a heat storage material container containing a heat storage material made of a bellows-shaped pipe, and 2 a pipe arranged concentrically with the heat storage material container 1 around the heat storage material container 1 for receiving a working fluid. The fluid container 3 is a heat generating mechanism attached in the middle of the containers 1 and 2, and the heat generating mechanism 3 has a piston 5 having a push button 4 on its top, a cylinder 6 surrounding the piston 5, and a spring for pushing the piston 5 upward. 7 and a heat generating device 8 placed in the cylinder 6 below the piston 5, and on both sides of the cylinder 6, inner and outer double annular projections 9 and 10 projecting in a direction perpendicular to the axis of the cylinder are formed. The pipe forming the heat storage material container 1 is connected to the inner protrusion 9 and the pipe forming the working fluid container 2 is connected to the outer protrusion 10. Here, the space between the piston 5 and the cylinder 6 is sealed by a bellows 11 which is vertically expandable and contractible. Both ends of the heat storage material container 1 are closed by plugs 12, and a heat storage material made of a salt hydrate is housed inside the plug 12, and a known mode is provided between the heat storage material container 1 and the working fluid flowing in the direction of the arrow into the working fluid container 2. Heat storage and heat dissipation are performed by.

Further, for example, in the conventional heat storage device disclosed in Japanese Patent Application Laid-Open No. 03-117895, barium hydroxide octa is used as a heat storage medium accommodated in a heat storage core adjacent to at least one flow path for heat transfer fluid. Hydrate [Ba
In the heat storage device having a composition containing (OH) ₂ · 8H ₂ O], at least a part of the heat storage device which is affected by the heat storage medium is at least selected from the group consisting of oxygen-free copper or nickel, chromium and phosphorus. It consists of an alloy of one kind and oxygen-free copper.

[0004]

Since the conventional heat storage device is composed of the inner and outer double tubes as described above, the heat storage density is high and a large amount of heat can be stored when the heat storage material is melted. At the same time, a large amount of heat can be efficiently released when the heat storage material is crystallized, but there is a problem that the heat retaining effect is lacking because no measure is taken against the heat retaining.

Further, oxygen-free copper or an alloy with at least one selected from the group consisting of nickel, chromium and phosphorus is Ba (OH) ₂ which is a heat storage material in a sealed state.
There is a problem that when a heat storage material having a high specific gravity is used, the material has a low strength although it has corrosion resistance to 8H ₂ O.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a heat storage device which is excellent in heat retention effect, corrosion resistance to a heat storage material and strength, at low cost.

[0007]

A heat storage device according to the present invention has an inner cylinder having a liquid substance inflow port and an outflow port, in which the liquid substance stays, and a liquid substance surrounding the inner cylinder. An outer cylinder that accommodates a heat storage material that exchanges heat with an inner cylinder, and an outermost cylinder that surrounds the outer cylinder and is a vacuum layer between the outer cylinder and the outer cylinder are provided.

The inner cylinder, the outer cylinder, and the outermost cylinder are made of stainless steel, and the outer wall of the inner cylinder and the inner wall of the outer cylinder, which are in contact with the heat storage material, are plated with copper or nickel.

[0009]

In the heat storage device of the present invention, the outermost cylinder having the three-layer structure is the vacuum layer, so that the liquid substance in the inner cylinder heated by the latent heat of fusion of the heat storage material is kept warm for a long time.

Further, since the portion in contact with the heat storage material is copper-plated or nickel-plated, it has excellent corrosion resistance to the heat storage material in the absence of air and has sufficient strength even for a heat storage material having a large specific gravity. The weight can also be reduced.

[0011]

【Example】

Example 1. An embodiment in which the present invention is applied to an automobile will be described below with reference to the drawings. In FIG. 1, 21 is the outermost cylinder, 22 is an outer cylinder having a vacuum with the outermost cylinder 21, and 23 is, for example, barium hydroxide octahydrate (Ba).
It is an inner cylinder in which a heat storage material such as (OH) ₂ .8H ₂ O) or sodium acetate trihydrate (CH ₃ COONa 3H ₂ O) is enclosed. Here, the outermost cylinder 21, the outer cylinder 22 and the inner cylinder 23 are all made of stainless steel. Two
4 is a packing for sealing the heat storage material enclosed between the outer cylinder 22 and the inner cylinder 23, 25 is an inner plug for circulating the cooling water, and 26 is for feeding the cooling water into the inner cylinder 23. IN side pipe, 27 is an OUT side pipe for sending out cooling water, 28 is glass wool inserted to have a heat insulating effect because the inner volume of the inner plug 5 is large, 29 is the inner plug 2
5 is a cap for fixing 5 to the outermost cylinder 21.

When barium hydroxide octahydrate having a melting point of 78 ° C. is used as the heat storage material in the heat storage device constructed as described above, for example, the engine cooling water temperature is 80 ° C.
In the above case, high temperature cooling water flows from the IN side pipe 26 by the pump provided in the cooling water circulation path to fill the inner cylinder 23. With this cooling water, the solid heat storage material in the heat storage material layer absorbs the latent heat of fusion and becomes a liquid state. When the engine stops and the temperature of the cooling water begins to drop, the temperature of the heat storage material also drops, but at the freezing point of 78 ° C, the heat storage material begins to crystallize and release latent heat of fusion,
This heat warms the cooling water in the inner cylinder 23. Furthermore, in the present invention, since the vacuum layer is provided outside the heat storage material layer, the cooling water heated by the latent heat of fusion of the heat storage material can be kept warm overnight or two nights. Therefore, at the next start, warm cooling water can be used and can also be used for heating or the like. Further, since the heat storage device is installed as shown in FIG. 1A, the cooling water sent from the short IN side pipe 26 changes the warm cooling water accumulated in the inner cylinder 23 from the long OUT side pipe 27. It is possible to send out preferentially from.

Further, the inner wall of the outer cylinder 22 and the outer wall of the inner cylinder 23, which are in contact with the heat storage material, are plated with copper or nickel, so that the heat storage material has corrosion resistance and excellent strength in a closed state. There is.

By the way, in the present embodiment, the present invention has been described as applied to the heat retention of the cooling water of the engine of the automobile, the heating of the interior of the automobile, etc., but it can also be diverted to other household appliances.

[0015]

As described above, according to the present invention, since the outermost cylinder having the three-layer structure is a vacuum layer, the liquid substance in the inner cylinder heated by the latent heat of fusion of the heat storage material is kept warm for a long time. It is possible to obtain a heat storage device that can.

Further, since the portion of the stainless steel that contacts the heat storage material is copper-plated or nickel-plated, a lightweight heat storage device having excellent corrosion resistance and strength can be obtained. Further, since stainless steel can be used, the heat storage device can be used at low cost. It can be manufactured at a cost.

[Brief description of drawings]

FIG. 1 is a sectional view showing a heat storage device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a conventional heat storage device.

[Explanation of symbols]

21 outermost cylinder, 22 outer cylinder, 23 inner cylinder, 24 packing, 25 inner plug, 26 IN side pipe, 27 OUT
Side pipe, 28 glass wool, 29 caps.

Claims (2)

[Claims] 1. A liquid substance has an inlet and an outlet,
An inner cylinder in which the liquid substance stays, an outer cylinder that surrounds the inner cylinder and accommodates a heat storage material that exchanges heat with the liquid substance between the inner cylinder, and the outer cylinder. A heat storage device comprising an outermost cylinder having a vacuum layer between the cylinder and the cylinder. 2. The inner cylinder, the outer cylinder, and the outermost cylinder are made of stainless steel, and the outer wall of the inner cylinder and the inner wall of the outer cylinder contacting the heat storage material are plated with copper or nickel. The heat storage device according to claim 1, wherein the heat storage device is a heat storage device.