JPS6159096A - Split type heat-insulating member - 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 The present invention relates to an improvement in a split type heat insulating member, and relates to a split type heat insulating member in which the contact area of mating surfaces of heat insulating members is reduced to prevent heat dissipation.

Periodic inspections are required for equipment and piping that handle high-temperature, high-pressure heat media, such as in nuclear power plants.

This periodic inspection is performed by peeling off the heat insulation material, and after the inspection is completed, the heat retention is restored.

The split type heat insulating member is used in such places and for such purposes.

In addition, various types of meters are often incorporated into this split type heat insulation member, for example, liquid metal (sodium)
The high-temperature equipment and piping of a fast breeder reactor that uses ferrite as a heat medium will be described below.

A conventional heat retaining member is shown in FIGS. 1 and 2.

This heat insulating member is a heat insulating member for the pipes of the high speed #M reactor, and is used to measure the temperature of the pipe wall of the pipe 1 and the heater 9 for melting sodium flowing in the pipe 1 or leaking sodium. A heat sink 10 and a sodium leak detector 11 for detecting sodium leaks are incorporated.

The heat insulating material 4 is a normal rock wool heat insulating material, a glass cool heat insulating material, or a heat insulating material laminated with thin metal foil. The interior plate 2, the exterior plate 3, the side end plates 5, and the lateral end plates 6 cover the entire heat insulating member.

The heat retaining member thus formed is divided into 2 to 4 parts at certain angular intervals on the circumference at the side end plate 5, and in the longitudinal direction, at the lateral end plate 6. It is divided into lengths ranging from 50 cm to several meters.

In this way, if the molded split-type heat insulating member is in close contact with the side end plates 5 and 6, there is a certain distance between it and the outer peripheral surface of the pipe 1 via the smoother 12. The bag is layered with an annular gap and is detachably attached with a buckle or band (not shown).

As another conventional example, as shown in FIGS. 3 and 4, 1
There is also one in which the i4II end plate 5 and the lateral end plate 6 are formed into a stepped shape so that they fit into each other to prevent convection of the air layer in the annular gap between the pipe 1 and the inner pipe 2.

In the conventional heat retaining member configured as described above, the heat of the sodium flowing in the pipe 1 is conducted to the air layer between the pipe 1 and the inner pipe 2.

Since this air layer is kept warm by the heat insulating material, no heat is dissipated, and the temperature is maintained at a high temperature close to the pipe wall temperature of the pipe 1.

However, the heat of the air layer is conducted to the inner pipe 2,
The heat is then transmitted to the exterior plate 3 through the side end plates 5 and 6, and is radiated to the outside.

As a result, the temperature of the exterior plate 3 at the part where the side end plate 5 and the side end plate 6 are fitted increases, in other words, the air layer in this part or the pipe wall temperature of the pipe 1 decreases, and the pipe wall of the pipe 1 This method has disadvantages in that it causes errors in temperature measurements, and also causes the leaked sodium to coagulate, making it impossible to detect the leaked sodium. In addition, such extreme cooling (piping 1 and inner pipe 2) and extreme heating (exterior pipe 3) generates large thermal stress in those parts, causing cracks or corrosion, and causing damage to piping 1. In the case of the inner pipe 2 and the outer pipe 3, the insulation material 4 becomes dust and is dispersed to the outside, causing radioactive contamination and reducing the reliability of the plant. It had the disadvantage of letting you do it.

In order to compensate for this shortcoming, a heat insulating material was loaded on the mating surfaces of the side end plates 5 and the mating surfaces of the side end plates 6 to reduce the heat conduction effect, but the loaded heat insulating material generated dust. The drawback was that radioactive waste was released outside, causing contamination.

The present invention aims to provide a split type heat insulating member that solves the above-mentioned conventional drawbacks by reducing the contact area between the side end plates and between the side end plates to suppress heat dissipation.

In other words, the present invention reduces the amount of heat conduction by reducing the contact area between the side end plates and between the side end plates. In the split-type heat insulating member formed by coating, the side end plates and the lateral end plates are mesh-like plates, and when the heat insulating material is layered in a bag layer for high temperature use, a heron holder, or piping, the side end plates and the lateral end plates overlap each other. It is characterized by having a small contact area and minimizing the amount of heat transferred from the interior panel. Also, pasting foil on the side end plate and the mesh part of the side end plate,
It is characterized by preventing the dispersion of dust from the insulation material and reducing leakage of radioactivity to the outside.

An embodiment of the present invention will be described in detail below.

First, an outline of this embodiment will be explained in detail.

In FIG. 5, the heat insulating material 4 is covered with an interior plate 2, an exterior plate 3, side end plates 5, and lateral end plates 6 to form a heat insulating member. The side end plate 5 and the lateral end plate 6 of this heat insulating member include
It is circular or has a mesh shape with long holes. By making the side end plates 5 and the lateral end plates 6 mesh-like in this way, the contact area when assembled is reduced, and the heat conduction effect from the interior board 2 is reduced.

A foil 14 is pasted on the mesh portion of the heat insulating material to prevent dust generation and to prevent leakage of radioactivity to the outside.

The details will be explained in more detail below.

FIG. 5 shows an embodiment in which the side end plates and the lateral end plates are shaped like steps.

In the figure, the protective material 4 is covered with an interior plate 2, an exterior plate 3, a side end plate 5, and a side end plate 6, and in the case of this embodiment,
A heat insulating member is formed which is divided into two in the circumferential direction. In this heat insulating member, the side end plates 5 are provided with elongated holes, and the lateral end plates 6 are provided with circular holes in a four-hole shape.

In addition, as for the 11th Al mesh shape of the side end plate 6, a triangular hole is provided in FIG. 7, and a shaped bonding material 15 is installed between the interior panel 2 and the exterior panel 3 in FIG. 8, and In Figure 1.49, a bar-shaped binding material 16 is installed between the interior panel 2 and the exterior panel 3, and the lateral end plates are mesh-shaped.These mesh sections are covered with foil 14 as shown in Figure 6. is pasted.

The operation of this embodiment configured as above will be explained next.

The split type heat insulating member is assembled with the side end plates 5 and the lateral end plates 6 in close contact with each other. This mutually close contact area is
The side end plates 5 and 6 come into contact at locations other than the holes drilled in the side end plates 5 and 6. Alternatively, if holes are made at certain intervals like the side end plate 5 shown in FIG. 5, the corresponding holes in the side end plate 5 should be positioned in the gaps between the holes. If the side end plates 5 are shifted apart, the area of the contact portion between the side end plates 5 becomes even smaller.

In the pipe covered with the heat insulating member in this way (first
(see figure or figure 2), high temperature gas flowing in pipe 1)
The heat of the IJum is conducted to the air layer retained in the annular gap between the outer peripheral surface of the pipe 1 and the interior panel 2. The heat thus conducted to the air layer is further conducted to the interior panel 2, and this heat is conducted to the exterior panel 3 by the side end plates 5 and 6.

Heat conduction from the interior panel 2 to the exterior panel 3 is carried out by the side end plates 5 and lateral end plates 6 that connect these two, and a large temperature gradient is created between the high-temperature interior panel 2 and the low-temperature exterior panel 3. , heat conduction becomes the largest part. In this way, due to the close contact between the side end plates 5 and the lateral end plates 6, where the heat conduction area is maximized, the heat of the divided interior board 2 is concentrated in this close contact area.

The contact area between the side end plate 5 and the lateral end plate 6 is reduced to enhance the heat conduction effect, and the height gradient of the side end plate 5 and the lateral end plate 6 itself is reduced to a thick comb. 6 and the interior plate 2 is approximately equal to the temperature of the interior plate 2, and the temperature of the joints between the side end plate 5 and the side end plate 6 and the exterior plate 3 is approximately equal to that of the exterior plate 3. temperature, and make the temperature gradient at these joints gentle.

In addition, foil is pasted on the mesh portions of the side end plates 5 and 6 to prevent the generation of dust from the heat insulating material.

According to the split type heat retaining member of the Shidatsu 9 invention described in detail above, the side end plates and the 1A diseased plate are made into a mesh shape, and the contact area between the side end plates and the lateral end plates is reduced, so that the side end plate Also, the temperature gradient at the joint between the side end plate and the interior or exterior plate can be made gentler, and extreme cooling or heating of the interior or exterior plate does not occur, and as a result, the temperature gradient between the outer periphery of the pipe and the interior plate is reduced. There is no effect on the temperature of the living air layer between the pipes, and the temperature of the piping can be accurately detected.

Also, due to thermal stress generated by cooling or heating the extreme parts,
There are no problems with cracks or corrosion of piping or interior/exterior plates, and there is no solidification of sodium caused by extreme cooling, so sodium leakage can be detected accurately.

In addition, by pasting foil on the mesh parts of the measuring end plates and side end plates, there is no generation of dust from the heat insulating material, there are no dirty racks due to radioactive waste, and the reliability of the plant can be improved. It has a remarkable effect.

[Brief explanation of drawings]

Figures 1 to 4 show conventional examples; Figure 1 shows one in which the side end plates and lateral end plates are in the form of a flat plate, and Figure 3 shows one in the form of steps.
2 is a cross-sectional view of FIG. 1, and FIG. 4 is a cross-sectional view of FIG. 3. Figures 5 to 9 show examples of the present invention, with Figure 5 being a perspective view of the heat insulating member, and Figure 6 showing the state in which foil is pasted on the side end plates and the mesh portions of the lateral end plates. Partially enlarged diagram,
FIG. 7 shows an embodiment in which the mesh of triangular holes is formed by a mesh of triangular holes, FIG. 8 by a rectangular plate, and FIG. 9 by a bar. 1... Piping, 2... Interior board, 3... Exterior board, 4...
...Heat insulation material, 5...Side end plate, 6...Horizontal end plate, 14.
··drop.

Claims (1)

[Scope of Claims] 1. In a split type heat insulating member comprising an interior plate, an exterior plate, a side end plate and a lateral end plate covered with a heat insulating material, the side end plate and the lateral end plate are mesh-like plates. , a split type heat insulating member characterized in that the contact surfaces between the side end plates and between the side end plates are reduced. 2. In a split type heat insulation member made of an interior plate, an exterior plate, a side end plate, and a side end plate covered with a heat insulating material, the side end plate and the lateral end plate are mesh-like plates, and the side end plate and the side end plate are mesh-like plates. A split type heat insulating member characterized in that the contact surface between the end plate and the lateral end plate is reduced, and foil is attached to the mesh portion of the side end plate and the lateral end plate.