JP2016053430A - Heat accumulation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat accumulation device capable of effectively preventing degradation of heat accumulation characteristics, and keeping durability, and easy in maintenance inspection.SOLUTION: A heat accumulation device 16 has a heat accumulation container 3 filled with a latent heat utilization heat accumulation agent 2, a metallic heat exchanger 6 in which a heat medium fluid flows, and which has an outer peripheral face configuring a heat transfer face between the heat accumulation agent and the heat medium fluid, is disposed in the heat accumulation container 3, and further a drop-lid 9 having a specific gravity smaller than the heat accumulation agent so that it is floatable on a liquid-phase heat accumulation agent in a state of projecting upward from a liquid level of the liquid-phase heat accumulation agent. The drop-lid 9 is slidably engaged with an inner peripheral face of the heat accumulation container 3 at a peripheral side face 30 of the drop-lid so that it is vertically movable while floating according to volume fluctuation of the heat accumulation agent. The metallic heat exchanger is disposed while liquid-tightly penetrating through a side face or a bottom face of the heat accumulation container 3, and provided with airtightness adjusting means 4 for adjusting airtightness between the peripheral side face of the drop-lid 9 and the inner peripheral face of the heat accumulation container 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat storage device, and more particularly, to a heat storage device that effectively prevents deterioration of heat storage characteristics while maintaining durability and easy maintenance and inspection.

Conventionally, a heat storage agent using latent heat has been used in many fields.
The heat storage agent using latent heat is a type that uses latent heat in the phase change between the solid phase and the liquid phase of the heat storage agent, and when the heat storage agent stores heat or dissipates heat from the heat storage agent, volume fluctuation of the heat storage agent is inevitable. Will occur.

As one aspect of its use, a plurality of small sealed resin containers filled with a heat storage agent are arranged in the container, and then the heat transfer fluid is filled in the container so that it can be taken out to the outside. ,
In an aspect in which the outer surface of each sealed resin container constitutes a heat transfer surface between the heat transfer fluid and the heat storage agent, heat storage from the heat transfer fluid to the heat storage agent and heat dissipation from the heat storage agent to the heat transfer fluid have been performed. It was.
However, such a use mode can prevent deterioration of the heat storage characteristics due to the hermeticity of the resin container. However, in the first place, both economic efficiency and ensuring heat exchange efficiency are achieved. I can't say that.
That is, the heat storage agent is small, that is, the heat storage agent having only a small heat capacity is divided into sealed resin containers having a low heat transmission rate over the thickness due to its material. However, heat exchange efficiency is not good.

In this regard, it is assumed that the heat storage agent is transferred from a small sealed resin container to a large container, and the large container is directly filled with the heat storage agent, and then a metal heat exchange tube is used. More specifically, a metal heat exchange tube is disposed in the heat storage container filled with the heat storage agent, and the heat transfer fluid flows inside and the outer peripheral surface forms a heat transfer surface between the heat storage agent and the heat transfer fluid. To do.
However, due to the heat storage agent in the container coming into contact with air, the characteristics of the heat storage agent deteriorate with time, or in the case of an organic heat storage agent, the heat storage agent itself deteriorates due to moisture absorption, oxidation, decay, etc. Technical problems are caused.

However, for example, as in a closed expansion tank, the outer peripheral edge of the diaphragm membrane is fixed to the inner peripheral surface of the container in a sealed manner, so that the volume variation of the heat storage agent in the container is If it is absorbed by the deformation of the direction, another technical problem is caused as follows.
That is, it is difficult to maintain and inspect the heat storage container.

More specifically, when performing maintenance and inspection of the heat storage container such as replacing the heat exchange tube in the heat storage container or cleaning the inside of the container, it is necessary to remove the diaphragm membrane fixed to the heat storage container. In addition, the removal of the diaphragm membrane causes deterioration of the diaphragm membrane itself.
In addition, when the heat storage container is particularly large, the diaphragm membrane is inevitably large, and it becomes difficult to maintain the shape retaining property of the flexible diaphragm membrane itself, so that the shape retaining property is ensured. For example, if the film thickness is increased, it becomes difficult for the diaphragm film to be deformed in the vertical direction so as to follow the volume fluctuation of the heat storage agent in the container.

  In view of the above technical problems, an object of the present invention is to provide a heat storage device that effectively prevents deterioration of heat storage characteristics, maintains durability, and is easy to perform maintenance and inspection.

In order to achieve the above object, the heat storage device of the present invention comprises:
It has a heat storage container filled with latent heat utilization heat storage agent,
In the heat storage container, a heat transfer fluid flows inside, and a metal heat exchanger whose outer peripheral surface constitutes a heat transfer surface between the heat storage agent and the heat transfer fluid is disposed,
A drop lid that is smaller than the specific gravity of the heat storage agent and floats on the liquid phase heat storage agent in a mode that protrudes upward from the liquid surface of the liquid phase heat storage agent is further provided,
The dropping lid is slidably engaged with the inner circumferential surface of the heat storage container so that the drop lid can move in the vertical direction while floating in accordance with the volume fluctuation of the heat storage agent,
The metal heat exchanger is provided so as to penetrate the side surface or bottom surface of the heat storage container in a liquid-tight manner,
An airtight holding means for maintaining airtightness between the peripheral side surface of the drop lid and the inner peripheral surface of the heat storage container is provided.

According to the heat storage device having the above configuration, in the heat storage container filled with the latent heat utilization heat storage agent, the heat transfer fluid flows inside the heat storage container, and the outer peripheral surface is composed of the heat storage agent and the heat transfer fluid. The metal heat exchanger that constitutes the heat transfer surface between them is arranged, and heat can be stored from the heat transfer fluid to the heat storage agent or released from the heat storage agent to the heat transfer fluid via the heat transfer surface. is there. Furthermore, a drop lid that is smaller than the specific gravity of the heat storage agent and that can float on the liquid phase heat storage agent in a mode that protrudes upward from the liquid surface of the liquid phase heat storage agent is further provided. Accordingly, the peripheral side surface is slidably engaged with the inner peripheral surface of the heat storage container so that it can move in the vertical direction while floating, and the peripheral side surface of the drop lid and the inner peripheral surface of the heat storage container Since the airtightness adjusting means for adjusting the airtightness between the drop lid and the inner peripheral surface of the heat storage container is adjusted according to the type of the heat storage agent. While it is possible to effectively prevent deterioration of the heat storage characteristics, if the drop lid is hermetically fixed to the inner peripheral surface of the heat storage container, the maintenance check of the heat storage container, particularly its interior, is inconvenient. In addition, the installation and removal of the lid is repeated every time maintenance is performed. Since the return, when the durability of the heat storage vessel is degraded, without causing such problems, it is easy with maintenance to maintain the durability.

The airtightness adjusting means may be formed by performing a coating treatment with a fluororesin on the peripheral side surface of the drop lid and / or the inner peripheral surface of the heat storage container.
When the latent heat utilizing heat storage agent is organic, the distance between the peripheral side surface of the drop lid and the inner peripheral surface of the heat storage container is preferably 2 mm or less.
When the latent heat utilization heat storage agent is inorganic, the interval between the peripheral side surface of the drop lid and the inner peripheral surface of the heat storage container is preferably 10 mm or less.

It is preferable to further provide a heat storage amount instruction means for instructing a measure of the heat storage amount by the heat storage agent using the level of the drop lid.
Furthermore, in the case where the interval between the peripheral side surface of the drop lid and the inner peripheral surface of the heat storage container exceeds a predetermined value,
Guide means for guiding the movement of the drop lid in the vertical direction is provided,
The guide means extends upward from a bottom surface of the heat storage container that is slidably fitted in a vertical direction with respect to an outer peripheral surface of the projecting body that projects downward from the lower surface of the drop lid. An outer tube,
In the outer pipe, when the drop lid is in the lowest position, the outer pipe is filled with an amount of lubricating oil so as not to overflow, allowing the inner pipe to smoothly slide with respect to the outer pipe,
The height of the outer tube may be set higher than the liquid level of the heat storage agent in the heat storage container.

Furthermore, when the liquid level of the heat storage agent in the heat storage container is at the lowest level, the lower end of the projecting body may have a clearance between the bottom surface of the heat storage container.

In addition, the projecting body may be an inner tube, and the guide means may have a double tube structure, and the double tube structure may be provided at the center of gravity of the drop lid.
Furthermore, the drop lid may have a rectangular shape, and the double tube structure may be provided at each corner of the drop lid.

A first embodiment of a heat storage device according to the present invention will be described below in detail with reference to the drawings.

In this embodiment, as the heat storage agent 2 filled in the container 3 of the heat storage device 16, fatty acid ester pastel M, which is a latent heat storage agent, is used.
In addition, as the organic latent heat storage agent, for example, PEG1000 may be used as a polyethylene glycol system.
A first embodiment of such a heat storage device 16 is shown in FIG. 1, and the heat storage agent 2 is directly charged into the container 3 of the heat storage device 16, and the heat exchange unit 6 of the heat exchanger is placed in the heat storage agent 2. Is immersed. In the heat exchanger 6 of this heat exchanger, a metal tube 7 is used as a conduit, and a metal fin 8 is similarly disposed in the tube 7. These tubes 7 and fins 8 are made of a metal material having a high thermal conductivity, and are made as thin as possible. The pitch of the fins 8 is also small. 74 is a heat storage agent injection port, and 75 is a heat storage agent discharge port.

The container 3 is provided with a drop lid 9 that covers the upper surface of the heat storage agent 2 in the proximity or contact state with the inner peripheral surface of the side of the container 3, and the drop cover 9 moves up and down on the upper surface of the heat storage agent 2. It moves to follow. Therefore, absorption of moisture and oxygen in the air by the heat storage agent 2, changes in the latent heat temperature of the heat storage agent, and generation of latent heat temperature glide can be prevented as much as possible, and changes in the characteristics of the heat storage agent 2 accompanying deterioration can be suppressed. At the same time, the heat storage device 16 can be prevented from being damaged by the volume change of the heat storage agent 2.

In the container 3, the introduction pipe 10 and the outlet pipe 11 of the heat exchanger are arranged so as to penetrate the side of the container 3, and the introduction pipe 10 and the outlet pipe 11 are immersed in the heat storage agent 2. Have been contacted.

Since the inlet pipe and outlet pipe of the heat exchanger are arranged so as to penetrate the side of the container, the vertical movement of the drop lid 9 due to the volume change of the heat storage agent affects the structure of the inlet pipe and outlet pipe. Absent.

By flowing the heat transfer fluid inside, heat of the heat transfer fluid can be directly stored in the heat storage agent 2 via the heat transfer surface including the tubes 7 and the fins 8 of the heat exchange unit 6. In addition, the heat of the heat storage agent 2 can be radiated directly to the heat transfer fluid via the heat transfer surface including the tubes 7 and the fins 8 of the heat exchange unit 6.

The drop lid 9 in the first embodiment is a drop lid that floats on the upper surface of the heat storage agent 2, and a gap adjusting means for adjusting the airtightness between the peripheral side surface of the drop lid 9 and the inner peripheral surface of the container 3. The inner surface of the container 3 is processed with fluororesin, and a gap of 2 mm or less is adjusted between the side surface of the drop lid 9 and the inner peripheral surface of the side of the container 3. The drop lid 9 can be smoothly moved up and down. The fluororesin processing is a process for reducing the friction with the side surface of the drop lid 9 such as applying a fluororesin-coated sheet in addition to the process of applying the fluororesin 4 to the inner peripheral surface of the container 3. Although not shown in the embodiment, the side surface of the drop lid 9 can be processed with fluororesin.
When the latent heat-utilizing heat storage agent is an organic system, the peripheral side surface of the drop lid 9 and the heat storage container 3 are used from the viewpoint of preventing deterioration of the characteristics of the heat storage agent over time, or deterioration of the heat storage agent itself due to moisture absorption, oxidation, and decay. The distance from the inner peripheral surface is preferably 2 mm or less.
Pastel M, which is a latent heat storage agent, is a fatty acid ester, and its specific gravity is about 0.85. Therefore, the specific gravity is compared with the specific gravity of the heat storage agent 2 in order to move the drop lid 9 up and down. Therefore, it is necessary to set the size small, and a metal lid that is lightened by providing a cavity inside is used. In addition, as materials suitable for the drop lid 9, materials having a specific gravity smaller than that of fatty acid esters, such as pine, cherry blossom, and cork, are suitable.
In this case, it is necessary to select a material suitable for the drop lid 9 so that the upper surface of the drop lid 9 is positioned above the liquid surface of the heat storage agent, instead of floating in the liquid of the heat storage agent.
As a modified example, a heat storage amount instruction means for instructing an indication of the amount of heat stored by the heat storage agent by using the level of the drop lid 9 may be further provided. When the phase changes to the phase, the volume of the heat storage agent usually decreases (see FIG. 2). At that time, the heat is radiated to the outside, whereas when the phase changes from the solid phase to the liquid phase, the heat storage is usually performed. The volume of the agent increases (see FIG. 2), and heat is stored from the outside at that time. The liquid phase volume of the heat storage agent in the container is a measure of the amount of heat storage, and the liquid phase volume is the liquid level in the heat storage container 3. Therefore, the scale of the heat storage amount may be written on the inner peripheral surface of the heat storage container 3.

According to the heat storage device having the above configuration, in the heat storage container filled with the latent heat utilization heat storage agent, the heat transfer fluid flows inside the heat storage container, and the outer peripheral surface is composed of the heat storage agent and the heat transfer fluid. The metal heat exchange tube that constitutes the heat transfer surface between them is arranged, and it is possible to store heat from the heat transfer fluid to the heat storage agent or to release heat from the heat storage agent to the heat transfer fluid via the heat transfer surface. is there. Furthermore, a drop lid that is smaller than the specific gravity of the heat storage agent and that can float on the liquid phase heat storage agent in a mode that protrudes upward from the liquid surface of the liquid phase heat storage agent is further provided. Accordingly, the peripheral side surface is slidably engaged with the inner peripheral surface of the heat storage container so that it can move in the vertical direction while floating, and the peripheral side surface of the drop lid and the inner peripheral surface of the heat storage container Since the airtightness adjusting means for adjusting the airtightness between the drop lid and the inner peripheral surface of the heat storage container is adjusted according to the type of the heat storage agent. Therefore, it is possible to effectively prevent deterioration of the heat storage characteristics without requiring high-precision processing technology, while if the drop lid is hermetically fixed to the inner peripheral surface of the heat storage container, Maintenance and inspection of the heat storage container, especially its interior, is inconvenient and laborious Mounting the lid off every time maintenance, since repeating the desorption, where durability of the heat storage vessel is degraded, without causing such problems, it is easy with maintenance to maintain the durability.

Hereinafter, a second embodiment of the present invention will be described with reference to FIG. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Hereinafter, the characteristic portions of the present embodiment will be described in detail.
The feature of the second embodiment of the present invention is that, when an inorganic system is employed as the latent heat utilization heat storage agent, it is possible to ensure the distance between the peripheral side surface 30 of the drop lid 9 and the inner peripheral surface 32 of the heat storage container 3. In order to enable the drop lid 9 to move smoothly in the vertical direction while maintaining the drop lid 9 horizontally, the guide means 34 for guiding the movement of the drop lid 9 in the vertical direction is provided.

More specifically, when the latent heat-based heat storage agent is inorganic, the characteristics of the heat storage agent deteriorate with time, or deterioration of the heat storage agent itself due to moisture absorption, oxidation, or decay, as a result of touching air compared to organic systems. It is difficult for the generation to occur, and the distance D3 between the peripheral side surface of the drop lid 9 and the inner peripheral surface of the heat storage container 3 is preferably 10 mm or less. In this case, since a large clearance between the peripheral side surface of the drop lid 9 and the inner peripheral surface of the heat storage container 3 can be secured, the processing accuracy of the drop lid 9 is not required and can be manufactured at a low cost. It is necessary to provide the guide means 34 so that the drop lid 9 can move smoothly in the vertical direction due to the volume fluctuation of the agent.
As the inorganic latent heat storage agent, for example, sodium hydrogen phosphate may be used.
In FIG. 2, for the sake of clarity, unlike FIG. 1, the illustration of the heat exchange unit 6 in the heat storage container 3 is omitted, while the clearance D <b> 3 between the drop lid 9 and the heat storage container 3, and the guide means 34. The clearance between the inner tube 38 and the outer tube 44 is exaggerated.
Corresponding to the fact that the heat storage container 3 is a cylindrical container, the dropping lid 9 has a cylindrical hollow box shape comprising an upper plate 50, a lower plate 52, and a side peripheral plate 54 connecting the two plates 50, 52. The lower plate 52 is provided with a circular overhanging flange 56, and the peripheral side surface of the overhanging flange 56 constitutes the peripheral side surface 30 of the drop lid 9.

The guide means 34 is externally fitted so as to be slidable in the vertical direction from the lower surface 36 of the upper plate 50 to the inner tube 38 projecting downward from the lower plate 52 and the outer peripheral surface 40 of the inner tube 38. A double tube structure having an outer tube 44 extending upward from the bottom surface 42 of the container 3 is formed, and the double tube structure is provided at the center of gravity of the drop lid 9, that is, at the center of the upper plate 50. In order to ensure smooth sliding of the inner tube 38 with respect to the outer tube 44, lubricating oil is filled between the outer peripheral surface of the inner tube 38 and the inner peripheral surface of the outer tube 44. What is necessary is just to define the space | interval between the inner peripheral surface of the outer tube 44 from such a viewpoint.
The lower plate 52 is provided with an opening 58 through which the inner tube 38 can penetrate in a non-contact manner, and when the drop lid 9 moves in the vertical direction due to a volume change in the heat storage container 3 of the heat storage agent, The lower plate 52 that moves in the vertical direction while being guided through the lubricating oil with respect to the outer tube 44 is prevented from contacting the outer tube 44.

The outer tube 44 is filled with a sufficient amount of lubricating oil B so that the outer tube 44 does not overflow when the drop lid 9 is at the lowest position, and the inner tube 38 can smoothly slide relative to the outer tube 44. The height of the outer tube 44 is set higher than the liquid level of the heat storage agent in the heat storage container 3. Thereby, the heat storage agent in the heat storage container 3 and the lubricating oil 46 are prevented from being mixed.
The lower end 48 of the inner pipe 38 has a clearance with the bottom surface 42 of the heat storage container 3 when the liquid level of the heat storage agent in the heat storage container 3 is at the lowest level.
At that time, as in the first embodiment, when heat is stored from the outside, the liquid phase volume of the heat storage agent in the container is a measure of the amount of heat stored, and the liquid phase volume can be grasped by the liquid level in the heat storage container 3. For this reason, the scale 61 of the heat storage amount may be written on the inner peripheral surface of the inner tube 38 that is a part of the drop lid 9.

According to the heat storage device having the above configuration, as shown in FIG. 2 (A), when the heat storage agent in the heat storage container 3 is solidified in a solid phase, the heat storage agent in the heat storage container 3 The upper surface level is at the lowest level, and the level of the lubricating oil B between the inner tube 38 and the outer tube 44 is at the highest level, but the lower surface of the lower plate 52 of the drop lid 9 is the upper surface of the solid-phase heat storage agent. On the other hand, the lower end 48 of the inner pipe 38 secures a clearance between the bottom face 42 of the outer pipe 44 and prevents the lubricating oil B from overflowing.
As shown in FIG. 2 (B), when the heat storage agent is heated by the heat exchange unit 6 in the heat storage container 3 to store heat, the heat storage agent increases in volume and becomes a semi-solidified state. Is smoothly moved upward while being guided by the guide means 34. More specifically, the upper surface level of the heat storage agent in the heat storage container 3 moves upward by D1 from the lowest level, and accordingly, the liquid level of the lubricating oil B between the inner tube 38 and the outer tube 44 increases. Descent from the top level.
As shown in FIG. 2 (C), when the heat storage agent is further heated by the heat exchanging unit 6 in the heat storage container 3 to store heat, the heat storage agent is completely liquefied, and accordingly, the drop lid 9 is guided by the guide means. While being guided by 34, it smoothly moves further upward. More specifically, the upper surface level of the heat storage agent in the heat storage container 3 moves upward by D2 from the lowest level, and accordingly, the liquid level of the lubricating oil B between the inner tube 38 and the outer tube 44 increases. Further down from the top level. At this time, the drop lid 9 floats above the liquid level of the liquid phase heat storage agent, and the liquid level of the heat storage agent is the drop lid 9 except for the annular portion between the peripheral side surface of the drop lid 9 and the inner peripheral surface of the heat storage container 3. Covered by.
In addition, when a thermal storage agent is cooled by the heat exchange part 6 in the thermal storage container 3 and dissipates heat, it progresses reversely from FIG. 2 (C) to FIG. 2 (A).
During maintenance of the heat storage device, for example, when checking or replacing the heat exchanging unit 6 in the heat storage container 3, as with the first embodiment, simply pulling the drop lid 9 upward. The inside of the heat storage container 3 can be easily accessed from the opening.

As a modification, when the drop lid 9 has a rectangular shape, the double tube structure may be provided at each corner of the drop lid 9. Accordingly, it is possible to guide the movement of the drop lid 9 in the vertical direction more stably than in the case where a single double tube structure is provided at the center of gravity of the drop lid 9. When the double tube structure is provided at the center of gravity of the drop lid 9, the drop lid 9 is not limited to a circle, but is preferably a point-symmetric shape, and the double tube structure is provided at each corner of the drop lid 9. When provided, the drop lid 9 is not limited to a rectangular shape, but is useful when it is not point-symmetric.

The embodiments of the present invention have been described in detail above, but various modifications or changes can be made by those skilled in the art without departing from the scope of the present invention.
For example, in the present embodiment, the application of the heat storage device is not mentioned, but as long as the heat storage container 3 filled with the latent heat utilization heat storage agent that causes volume fluctuation is required, it is used in various applications, for example, a refrigeration apparatus. It may be used as a heat storage device used for defrosting a load cooler.
For example, in the second embodiment, the inner tube 38 as a part of the guide means for the drop lid has been described as a hollow body from the viewpoint of weight reduction and cost reduction. As long as it is possible to perform the guide function, for example, a solid body may be used.

It is the perspective view (A) and sectional drawing (B) of the thermal storage apparatus which concern on 1st Embodiment of this invention. It is the schematic of the thermal storage apparatus which concerns on 2nd Embodiment of this invention, FIG. 2 (A) is a solidified state for a thermal storage agent, FIG.2 (B) is a semi-solidified state for a thermal storage agent, FIG.2 (C) is The case where a thermal storage agent is a liquefied state is shown.

L Liquid phase heat storage agent
S Solid phase heat storage agent
B Lubricating oil
D1 Transfer amount of the heat storage agent from the solidified state to the semi-solidified state in the heat storage container
D2 Amount of top-level transfer of the heat storage agent from the solidified state to the liquefied state in the heat storage container
D3 Clearance between the outer peripheral surface of the drop lid and the inner peripheral surface of the heat storage container 1 Heat storage device 3 Heat storage container 4 Fluororesin 6 Heat exchange part 7 Tube 8 Fin 9 Drop cover 10 Introducing piping 11 Outlet piping 30 Peripheral side surface 32 Inner peripheral surface 34 Guide means 36 Lower surface 38 Inner tube 40 Outer peripheral surface 42 Bottom surface 44 Outer tube 46 Lubricating oil 48 Lower end 50 Upper plate 52 Lower plate 54 Side peripheral plate 56 Overhang flange 58 Circular opening 59 Hollow portion 60 Inner peripheral surface 61 Scale

Claims (9)

It has a heat storage container filled with latent heat utilization heat storage agent,
In the heat storage container, a heat transfer fluid flows inside, and a metal heat exchanger whose outer peripheral surface constitutes a heat transfer surface between the heat storage agent and the heat transfer fluid is disposed,
A drop lid that is smaller than the specific gravity of the heat storage agent and floats on the liquid phase heat storage agent in a mode that protrudes upward from the liquid surface of the liquid phase heat storage agent is further provided,
The dropping lid is slidably engaged with the inner circumferential surface of the heat storage container so that the drop lid can move in the vertical direction while floating in accordance with the volume fluctuation of the heat storage agent,
The metal heat exchanger is provided so as to penetrate the side surface or bottom surface of the heat storage container in a liquid-tight manner,
A heat storage device, wherein an airtightness adjusting means for adjusting airtightness between a peripheral side surface of the drop lid and an inner peripheral surface of the heat storage container is provided.   2. The heat storage device according to claim 1, wherein the airtightness adjusting unit is formed by performing a coating treatment with a fluororesin on a peripheral side surface of the dropping lid and / or an inner peripheral surface of the heat storage container.   3. The heat storage device according to claim 2, wherein when the latent heat use heat storage agent is an organic system, a distance between a peripheral side surface of the drop lid and an inner peripheral surface of the heat storage container is 2 mm or less.   3. The heat storage device according to claim 2, wherein when the latent heat use heat storage agent is inorganic, a distance between a peripheral side surface of the drop lid and an inner peripheral surface of the heat storage container is 10 mm or less.   The heat storage device according to claim 1, further comprising heat storage amount instruction means for instructing a measure of the amount of heat stored by the heat storage agent using the level of the drop lid. In the case where the interval between the peripheral side surface of the drop lid and the inner peripheral surface of the heat storage container exceeds a predetermined value,
Guide means for guiding the movement of the drop lid in the vertical direction is provided,
The guide means extends upward from a bottom surface of the heat storage container that is slidably fitted in a vertical direction with respect to an outer peripheral surface of the projecting body that projects downward from the lower surface of the drop lid. An outer tube,
In the outer pipe, when the drop lid is in the lowest position, the outer pipe is filled with an amount of lubricating oil so as not to overflow, allowing the inner pipe to smoothly slide with respect to the outer pipe,
The heat storage device according to claim 4, wherein the height of the outer pipe is set to be higher than the liquid level of the heat storage agent in the heat storage container.   The heat storage device according to claim 6, wherein the lower end of the projecting body has a clearance between the bottom surface of the heat storage container when the liquid level of the heat storage agent in the heat storage container is at the lowest level.   The heat storage device according to claim 7, wherein the protruding body is an inner tubular shape, and the guide means has a double tube structure, and the double tube structure is provided at a center of gravity of the drop lid.   The heat storage device according to claim 8, wherein the drop lid has a rectangular shape, and the double tube structure is provided at each corner of the drop lid.

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