JPH0326391Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a heat insulating block, particularly to a heat insulating block useful for application to heat insulating coatings of horizontal joints of turbine casings and other attached equipment.

BACKGROUND OF THE INVENTION Since a turbine casing is opened for regular internal inspection work, it is desirable that a heat insulating block applied to its heat insulating coating be removable and reusable. Conventionally, heat insulating blocks that can satisfy these demands include a reinforcing frame assembled from metal wires and thin metal plates, and an inorganic fiber heat insulating layer filled in layers inside the reinforcing frame. A similar structure has been proposed (for example, see Japanese Utility Model Publication No. 43-31208).

Problems to be Solved by the Invention However, in the above-mentioned conventional heat insulation block, the reinforcing frame, which is a component of the block, has high heat conductivity, so it dissipates a large amount of heat, and has other disadvantages such as being heavy. During insulation coating, the blocks are heated by the turbine casing and expand and deform, and due to this expansion and deformation, the connecting end surfaces of the blocks warp, creating gaps and reducing heat retention, and further deforming and reducing dimensional accuracy. When re-assembling the heat-retaining coating after an internal inspection, there were problems such as the need to readjust the dimensional accuracy or, in some cases, the insulating coating could not be reused.

The present invention has been made with the aim of eliminating such conventional problems.

Means for Solving the Problems The present invention is a heat insulating block applied to the heat insulated part of a turbine casing, which includes a plurality of block pieces assembled into a predetermined shape and a heat insulating block between the joint end faces of the block pieces. The block piece is provided with an interposed elastic heat insulating layer and a joining metal fitting that restrains the block piece in an assembled state, and the block piece is composed of an inorganic molded body and a heat-resistant cloth that covers the entire surface of the molded body. The present invention relates to a heat-retaining block characterized by:

In the present invention, various known materials can be used as the molding material for the inorganic molded body, such as perlite, diatomaceous earth, calcium silicate, cellular glass, vermiculite, ceramic fiber blanket, etc. Calcium silicate is particularly suitable because it is lightweight and has good heat retention properties.

Heat-resistant cloth is used to provide surface strength such as scratch resistance and abrasion resistance to inorganic molded bodies, as well as dust-proofing properties, and is made of, for example, asbestos-based, carbon-based, or silica-alumina-based heat-resistant fiber materials. A cloth material is used. In particular, carbon-based and silica-alumina-based materials are suitable as they are harmless to the human body.

Function: The heat insulation block according to the present invention is equipped with a metal bond, so when constructing and restoring the heat insulation coating,
The hardware can be used to connect the blocks to each other, and when disassembling the block, the connections between the hardware can be simply released, making construction, disassembly and restoration of the heat-insulating covering part easy. In addition, the elastic insulation material layer interposed between each block piece absorbs the thermal expansion that occurs in the block piece when it is covered with heat.
To prevent a block piece from being damaged by thermal expansion, and to eliminate the adverse effect of thermal expansion on the dimensional accuracy of the block piece.

Embodiments Below, embodiments of the present invention will be described based on the accompanying drawings.

1 to 3 show an example of the heat insulating block of the present invention applied to the heat insulating coating of the horizontal joint part b of the turbine casing a. The heat insulation block A is composed of L-shaped upper and lower block pieces A ₁ , A ₁ and a flat middle block piece A ₂ , and these block pieces are connected by band-shaped metal fittings B ₁ , B ₂ fixed to the outer surface. ing. In the figure, C is a layer of elastic heat insulating material interposed between the joint end surfaces of the block pieces.

Block pieces _A1 and _A2 , as shown in the cutout in FIG.
It is composed of a heat-resistant cloth 2 that covers the entire surface of.

Figure 2 shows how the joint _{B 1 (} or B ₂ ) is attached and fixed to the block piece A ₁ (or A ₂ ). It is an amorphous inorganic filler.

Figure 3 shows the horizontal joint part b of the turbine casing a.
The situation is shown in which the above-mentioned heat insulating block A is used to insulate and cover. Thermal insulation block A has mounting hardware fixed to the casing a at the upper and lower ends of the upper and lower block pieces A ₁ , A ₁ , and the joining hardware B ₁ , B ₁ .
It is fixed to a ₁ and a ₁ using bolt nuts D ₂ . Further, the heat insulation blocks A and A may be connected to each other by using _{a bolt/nut D 3 (} see Fig. 1) using, for example, the horizontal portion B ₂ ′ of the connecting metal B ₂ of the intermediate block A 2 . , A can be interposed with an elastic heat insulating material (not shown) as a cushion material. In the figure, F is a layer of elastic heat insulating material interposed over the entire inner surface of the heat insulating block A, and the layer F may be wrapped inside the heat insulating block A by a heat-resistant cloth 2. The elastic heat insulating material may be any material that can be deformed by external force and restored to its original volume when the external force is removed, such as rock wool, silica fiber, silica-alumina fiber, glass fiber, etc. Cotton-like materials such as carbon fiber and stainless wool,
Yarn, felt, brackets, etc. can be used.

In the heat-insulating coating structure shown in FIG. 3, heat-insulating block A is heated by turbine casing a, and block A is composed of an inorganic molded body 1 and a heat-resistant cloth 2 that covers its entire surface. Because of this, there is almost no thermal expansion or deformation caused by thermal expansion, and the excellent heat retention properties that existed at the time of construction can be maintained indefinitely.

Also, when inspecting the inside of the turbine, check the bolts and nuts.
By removing D ₂ and D ₃ , the heat insulation covering can be easily dismantled. Also, bolt nuts if necessary.
By removing _D4 , heat insulation block A can be disassembled into block pieces _A1 and _A2 .

After being disassembled, insulation block A has no deformation due to thermal expansion, and heat-resistant cloth 2
Since it has been given superior surface strength, it will not be damaged during disassembly, and since it has the same dimensional accuracy as when it was constructed, it can be reused as is during restoration.

Figures 4 and 5 show the main body part d of the turbine casing a.
There is no substantial difference from that shown in FIG. 1 except that the heat insulating block A has an arcuate shape that follows the curve of the main body part d.

Figures 6 and 7 show the state of insulation covering the intercept valve e attached to the turbine casing a; in this case, the insulation block A covers the main body part e ₁ of the valve e.
It is substantially different from that shown in Fig. 1, except that it is composed of a split cylindrical part A ₃ that covers the valve head e ₂ and a split cap part A ₄ that covers the head e 2 of the valve e. There is no. In the figure, G is an asbestos futon.

8 and 9 show the state of insulation covering the reheat stop valve attached to the turbine casing a, and in this case also, the insulation block A is
As in the case shown in FIG. 7, it is composed of a split cylindrical part _A5 that covers the main body ₁ of the valve, and a split cap part _A6 that covers the head ₂ .

FIGS. 10 and 11 show the state of insulation covering the straight pipe part g. In this case, the insulation block A is composed of a pair of semi-cylindrical parts A ₇ , _{A 7 .}
is designed to be fastened by a band H with a buckle _H1 .

Effects The heat insulation block according to the present invention has excellent dimensional stability against heating, and has excellent surface strength so that it will not be damaged during dismantling, making it extremely useful for constructing heat insulation coverings that can be repeatedly dismantled and restored. It is.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway slope view showing an example of the implementation of the present invention, Fig. 2 is an enlarged sectional view showing how the coupling fittings are attached, Fig. 3 is a vertical sectional view showing one usage situation, and Fig. 4- 5, 6-7, 8-9, and 10-11 are longitudinal cross-sectional views and oblique views of essential parts showing other embodiments of the present invention and one usage situation thereof. In the figure, 1 is an inorganic molded body, 2 is a heat-resistant cloth, and A is a heat insulation block.

Claims (1)

[Scope of utility model registration request] A heat insulating block applied to a heated part of a turbine casing, comprising a plurality of block pieces assembled into a predetermined shape, an elastic heat insulating material layer interposed between joint end faces of the block pieces, and the above-mentioned heat insulating block. A heat insulator for a turbine casing, characterized in that the block piece is comprised of an inorganic molded body and a heat-resistant cloth that covers the entire surface of the molded body, comprising a metal joint for restraining the block piece in an assembled state. Block.