KR101570450B1 - Wet thermal insulator restricting coolant natural circulation - Google Patents

Abstract

According to the present invention, disclosed is a wet thermal insulator for preventing coolant natural circulation, which includes: a first thermal insulator protection board which has one plane to be exposed in a compressor space; a second thermal insulator protection board which contacts an outer wall of a compressor; a stacked thermal insulation part which is arranged between the first thermal insulator protection board and the second thermal insulator protection board, and is formed by stacking a wet thermal insulator board comprising a protrusion protruded in a fixed interval along a thickness direction of the first thermal insulator board in plural times; a gap filling band which is installed in a space between the wet thermal insulator boards, in order to prevent the flow of a coolant in the space between the wet thermal insulator boards; and a seal-welding part which is formed between at least two of the wet thermal insulator board, the gap filling band, the first and the second thermal insulator protection board, in order to prevent the coolant from being flowed into the wet thermal insulator board by seal-welding.

Description

{WET THERMAL INSULATOR RESTRICTING COOLANT NATURAL CIRCULATION}

The present invention relates to a wet thermal insulator disposed within an integral nuclear reactor vessel.

The pressurizer in the integral reactor is installed inside the reactor vessel and the temperature inside the reactor and the inside of the pressurizer must be kept different.

For this purpose, the integrated reactor is provided with a wet insulation material between the inside of the reactor and the pressurizer to suppress the heat transfer between the high temperature part and the low temperature part.

Conventional wet insulation materials used in integrated reactors are formed by forming protrusions formed with protrusions at regular intervals on a thin, wet insulation plate and stacking a plurality of the above-mentioned wet insulation plates so that coolant inside the reactor can be permeated and filled between the plates .

The wet thermal insulator is filled with a coolant between the heat insulating plate laminated portions, and the heat transfer between the high temperature portion and the low temperature portion is suppressed by keeping the coolant stagnant, thereby maintaining the heat insulating function.

Korean Patent Laid-Open No. 10-1336835 (entitled "Wet Heat Insulation for Preventing Coolant Natural Circulation") discloses a method for preventing natural circulation of coolant by providing a gap filling band between the laminated wet heat insulating plates.

The wet thermal insulator disclosed in the above patent document has a structure in which a wet insulating plate is simply laminated and a gap filling band is inserted into the lower edge of the laminated wet heat insulating plate to suppress the circulation of the coolant, but the circulation of the coolant can not be completely blocked.

In the wet insulation material of this structure, the coolant easily flows into the gap due to the local deformation of the wet insulation plate generated in the manufacturing process and the gap between the gap filling band, and the introduced coolant circulates in the wet insulation due to the temperature difference of the structure, As a result, it has been found that the adiabatic performance is remarkably lowered as a whole.

Accordingly, there is a need to develop a wet thermal insulator which can prevent the natural circulation of the coolant that may be generated inside the wet thermal insulator and can maintain excellent heat insulating performance.

It is an object of the present invention to provide a wet thermal insulator improved in heat insulation performance by preventing natural circulation of a coolant between wet insulation plates.

It is another object of the present invention to provide a wet thermal insulator for an integrated reactor capable of preventing a coolant from flowing into a wet thermal insulator.

According to an aspect of the present invention, there is provided a heat insulating material comprising: a first heat insulating material protecting plate having one surface exposed to a pressurizing space; A second heat insulating material shield plate contacting the outer wall of the pressurizer; A laminated thermal insulation unit disposed between the first thermal insulation protection plate and the second thermal insulation protection plate and having a plurality of protrusions protruding at regular intervals in a thickness direction of the first thermal insulation protection plate; A gap filling band provided in a space between the wet-type heat insulating plates so as to prevent the flow of the coolant in the space between the wet-type heat insulating plates; And a sealing weld formed between at least two of the wet insulation plate, the gap fill band, and the first and second thermal insulation shields so as to prevent the coolant from flowing into the wet insulation plate by sealing welding.

According to an embodiment of the present invention, a plurality of stacked heat insulating parts are provided in a space between the plurality of stacked heat insulating parts, the support part having one side fixed to the outer wall of the pressing device.

According to another embodiment of the present invention, the sealing weld portion is provided with an opening portion forming an inlet port so that the coolant is filled.

According to another embodiment of the present invention, the coolant natural-circulation-preventing wet thermal insulator is composed of a plurality of wet insulation materials, and the plurality of wet insulation materials surrounds the outer wall of the pressurizer.

The gap filling band is provided at a space edge between the wet heat insulating plates, and the sealing welded portion may be formed at the upper end, the lower end, and both ends of the laminated heat insulating portion.

The upper end of the sealing welded portion may be provided with an opening portion for forming an inlet port so as to fill the coolant.

Wherein the first and second heat insulating protection plates are formed in a cylindrical shape and the plurality of wet heat insulating plates are laminated in a cylindrical shape having radii different from each other or consist of a plurality of layers by continuously winding the plate, And the laminated heat insulating portion may be in the shape of a cylinder having a predetermined thickness, arranged in parallel with the first and second heat insulating material protecting plates.

The gap filling band may be provided in a space between the upper and lower portions of the laminated heat insulating portion and between the wet insulating plates, and the sealing welded portion may be formed at an upper end portion and a lower end portion of the laminated insulating portion.

The upper end of the sealing welded portion may be provided with an opening portion for forming an inlet port so as to fill the coolant.

According to still another aspect of the present invention, there is further provided a fixed welded portion for welding the sealing welded portion to the outer wall of the pressurizing portion and blocking the circulation path of the coolant.

According to another aspect of the present invention, there is provided a method of manufacturing a heat insulating material, comprising the steps of: forming a heat insulating material on a surface of a heat insulating material; A second heat insulating material protection plate formed as a disc and contacting the presser bottom plate; A laminated thermal insulation plate disposed between the first thermal insulation protection plate and the second thermal insulation protection plate and having a protrusion protruding at regular intervals, the thermal insulation plate having a disk shape is laminated a plurality of times in the thickness direction of the first thermal insulation protection plate; A gap filling band provided in an edge space between the wet insulating plates so as to prevent the flow of the coolant in the space between the wet insulating plates; And a sealing welded portion formed between at least one of the wet heat insulating plate, the gap filling band and the first and second heat insulating shield plates at the outer peripheral surface of the laminated heat insulating portion so as to prevent the coolant from flowing into the wet heat insulating plate by sealing welding. .

According to one embodiment of the present invention, the sealing weld portion of the outer circumferential surface of the laminated heat insulating portion is provided with an opening portion for forming an inlet port so that the coolant is filled.

According to another embodiment of the present invention, at least one through hole is formed in the laminated thermal insulating part, the first and second thermal insulating material protecting plates in a direction parallel to the center axis of the first thermal insulating protective plate, The sealing weld portion is formed on the inner circumferential surface of the through hole so as to block the introduction into the space between the heat insulating plates.

The through hole may be formed concentrically with the first heat insulating material protecting plate.

According to still another aspect of the present invention, there is further provided a fixed welding portion for welding the sealing weld portion to the presser bottom plate and blocking the circulation path of the coolant.

According to another example related to the present invention, the gap filling band is formed to have a thickness enough for the protrusion to protrude so as to fill the gap between the wet insulation plates.

According to one embodiment of the present invention, a gap filling band is inserted between the wet insulating plates so that the coolant circulation path is formed between the wet insulating plates, and the gap filling band and the wet insulating plate are welded to each other and sealed. Such a structure can prevent the inflow of the coolant located outside the wet insulating material to the inside of the wet insulating material and prevent the natural circulation of the coolant from occurring between the wet insulating plates, thereby improving the heat insulating performance.

According to another embodiment of the present invention, a heat insulating material protecting plate of a thin thin plate is provided on the outer wall surface and the inner wall surface of the wet insulating material, and the heat insulating material protecting plate, the gap filling band and the wet insulating plate are sealed by welding. Thus, it is possible to prevent the coolant from flowing into the inside of the wet insulating material.

According to another embodiment of the present invention, the coolant is sucked into the inside of the wet heat insulator and the air inside the wet heat insulator is exhausted by forming a plurality of non-welded portions on one side of the sealed welded surface, It is possible to provide a passage for filling and discharging.

On the other hand, it is possible to prevent the coolant from flowing between the outer cylinder and the bottom plate of the pressurizer structure and the heat insulating material protecting plate of the wet thermal insulating material, by sealing the edge of the heat insulating protective plate with the outer cylinder or the bottom plate.

1 is a cross-sectional view of an integral nuclear reactor in which a wet thermal insulator for preventing natural circulation of coolant of the present invention is installed.
2 is a sectional view of a wet thermal insulator for preventing natural circulation of a coolant according to an embodiment of the present invention;
3 is a detailed view of a portion A in Fig.
4 is a detailed view of a portion B in Fig. 3;
FIG. 5 is a front view of the wet insulating plate of FIG. 2 according to the present invention and a cross-sectional view of a plurality of wet insulating plates.
6 is a perspective view of a wet thermal insulator for preventing natural circulation of coolant according to another embodiment of the present invention.
7 is a perspective view of a wet thermal insulator for preventing natural circulation of coolant according to another embodiment of the present invention.
8 is a perspective view of a wet thermal insulator for preventing natural circulation of coolant according to another embodiment of the present invention.
Fig. 9 is a sectional view of Fig. 8; Fig.
FIG. 10 is a detailed view of a portion C in FIG. 9; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In the present specification, the same or similar reference numerals are given to different embodiments in the same or similar configurations. As used herein, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

According to various embodiments of the present invention, the coolant natural circulation-preventing wet insulation may be installed in an integrated reactor.

1 is a cross-sectional view of an integral nuclear reactor in which a wet thermal insulator 10 for preventing natural circulation of coolant of the present invention is installed.

Referring to FIG. 1, the pressurizer space 30 comprises a space formed between the pressurizer outer wall 40, the presser bottom plate 60, and the reactor cover 20. The temperature of the pressurizer space 30 and the temperature of the reactor internal space 50 must be kept different from each other.

The wet thermal insulator 10 for preventing natural circulation of the coolant of the present invention is installed inside the pressurizer outer wall 40 of the integral reactor or above the pressurizer bottom plate 60 to perform heat transfer between the pressurizer space 30 and the reactor interior space 50 .

2 to 7 show the wet heat insulators 100, 200 and 300 installed inside the pressurizer outer wall 40 and FIGS. 8 to 10 show the wet heat insulator 400 installed above the pressurizer bottom plate 60 Respectively.

2 is a sectional view of a wet thermal insulator 100 for preventing natural circulation of a coolant according to an embodiment of the present invention, and Fig. 3 is a detailed view of a portion A in Fig. 4 is a detailed view of a portion B in Fig.

2 to 4, a description will be made of a wet thermal insulator 100 for preventing natural circulation of a coolant according to an embodiment of the present invention.

The wet thermal insulation material 100 for preventing natural circulation of the coolant according to an embodiment of the present invention includes a first thermal insulation protection plate 110, a second thermal insulation protection plate 120, a laminated thermal insulation unit 130, a wet insulation plate 133, (150) and a seal weld (160)

One side of the first thermal insulation cover plate 110 is exposed to the pressurizer space 30 and the second thermal insulation cover plate 120 is contacted to the pressurizer outer wall 40. The first and second heat insulating protective plates 110 and 120 serve to protect the laminated insulating unit 130 to maintain the heat insulating function of the laminated insulating unit 130. The first and second heat insulating protective plates 110 and 120 may be formed of a material having sufficient rigidity to protect the laminated thermal insulating unit 130. In particular, the wet insulating plate 133 and the gap filling band The heat insulating plate 133 and the gap filling band 150 are preferably made of the same material.

The laminated thermal insulation unit 130 is disposed between the first thermal insulation protection plate 110 and the second thermal insulation protection plate 120 and the wet thermal insulation plate 133 is laminated a plurality of times in the thickness direction of the first thermal insulation protection plate 110 . FIG. 2 shows an example of a laminated thermal insulating unit 130 in which approximately 10 wet insulating plates 133 are laminated.

The wet heat insulating plate 133 may be formed of a thin metal plate, and the wet heat insulating plate 133 is formed with a protruding portion 135 protruding at regular intervals. Due to the protrusions 135, a plurality of constant gaps are formed between the wet insulation plates 133.

As the coolant is layered and filled in the gap through the gap, a plurality of stagnant coolant layers can be formed between the reactor interior and the pressurizer space, thereby suppressing heat transfer. The detailed structure of the wet insulating plate 133 will be described in the description of FIG.

At the upper and lower edges of the wet insulating plate 133, gap filling bands 150 are inserted into the gap between the wet insulating plates 133. The gap filling band 150 is a metal plate in the form of a strap having a constant thickness so that the coolant inside the wet heat insulating material 100 flows into the lower portion of the wet insulating plate 133 to suppress the flow path rising upward .

The gap filling band 150 forms the sealing welded portion 160 together with the first heat insulating protective plate 110 and the wet insulating plate 133 so that the coolant does not flow into the space between the wet insulating plates 133. [ So that the natural circulation of the coolant can be prevented.

The gap filling band 150 may be formed to have a thickness such that the protrusion 135 protrudes to fill the space between the wet insulation plates 133.

The sealing welded portion 160 is formed by sealing and welding at least two of the wet heat insulating plate 133, the gap filling band 150, and the first and second heat insulating material protecting plates 110 and 120. 3 and 4 show an example of the seal welded portion 160, which will be described below.

The sealing welded part 160 is formed by sealingly welding the first heat insulating protective plate 110, the wet insulating plate 133 and the gap filling band 150 at the lower left end of the laminated thermal insulating part 130, A plurality of wet heat insulating plates 133 and gap filling bands 150 are sealed-welded to the intermediate lower end portion. A sealing welded portion 160 is formed at the lower right end of the laminated insulating portion 130 to seal the second thermal insulating protective plate 120, the wet thermal insulating plate 133 and the gap filling band 150.

That is, the second thermal insulation protection plate 120 and the first thermal insulation protection plate 110 are installed on the inside and the outside of the wet insulation member 100 and the gap filling band 150 is inserted between the wet insulation plates 133, The sealing welded portion 160 is formed by sealing welding.

The sealing welded part 160 may be formed on the upper and lower ends of the laminated thermal insulating part 130 and may include various types of first and second thermal insulating protective plates 110 and 120 and laminated thermal insulating parts 130, May be formed in consideration of the shape.

When the sealing welded part 160 is formed on the upper and lower ends of the laminated thermal insulating part 130, the upper end sealed thermal welded part 160 may be provided with an opening part 165. The opening 165 is an inlet of the coolant filled with the coolant. Further, the opening portion 165 discharges the air inside the laminated insulating portion 130.

The opening portion 165 is an inlet that does not undergo sealing welding between the sealing welded portions 160 and the gap filling band 150 is not provided inside the opening portion 165.

The openings 165 may be provided at a plurality of spaced apart from each other by a predetermined distance so that the coolant may be appropriately filled in the space between the wet insulating plates 133. The open portion 165 may be formed at the upper end of the sealed welded portion 160 according to various shapes of the laminated thermal insulating portion 130, such as an upper end portion, an outer peripheral surface, and the like. Such a structure is advantageous for improving the heat insulating performance by reducing the flow area of the internal coolant.

When a plurality of laminated heat insulating portions 130 are provided, a support base 180 fixed to the pressurizing outer wall 40 is provided between the laminated heat insulating portions 130. For example, the support base 180 is formed in the shape of a plate to support the lower portion of the laminated insulating portion 130. The support 180 may be welded to one side of the presser outer wall 40.

The wet insulation member 100 may further include a fixed weld 170 which welds the lower end of the second thermal insulation cover 120 to the pressurizer outer wall 40. Accordingly, the path through which the coolant circulates between the pressurizer outer wall 40 and the second heat insulating member shield plate 120 can be blocked.

5 is a front view of the wet insulating plate 133 of FIG. 2 and a cross-sectional view of the plurality of wet insulating plates 133 according to the present invention.

With reference to Fig. 5, the lamination structure of the wet insulating plate 133 having the protrusions 135 protruding at regular intervals will be described.

The protrusions 135 protruding at regular intervals are formed in the wet insulation plate 133. FIG. 5 shows an example in which nine protrusions 135 are formed in the wet insulating plate 133, three in width and three in height.

5 shows a structure in which the wet insulating plate 133 has a predetermined clearance and is laminated a plurality of times in the thickness direction of the first heat insulating material protecting plate 110 described above. A space is formed between the wet insulating plates 133 so that the protrusions 135 protrude therefrom, and the coolant is filled in the space between the protrusions 135.

6 is a perspective view of a wet thermal insulator 200 for preventing natural circulation of coolant according to another embodiment of the present invention.

Hereinafter, with reference to Fig. 6, description will be made on the polyhedral side surface wet insulating material 200. Fig. However, the parts overlapping with the above-described parts in Figs. 2 to 4 will be replaced with the above-mentioned contents.

6, a laminated thermal insulating unit (not shown) is formed between the first and second thermal insulating protective plates 210 and 220, and the laminated thermal insulating unit is a wet thermal insulating plate (not shown) In the thickness direction of the substrate 210. This has been described above in the description of Figs. 2 to 5.

In Fig. 6, a gap filling band (not shown) is provided near the edge of the space between the plurality of wet-type insulating plates. Therefore, the sealing welded portion 260 is formed at the upper end, the lower end, and the left and right end portions of the wet insulating material 200. The openings 165 may be spaced apart from the upper end of the wet insulating material 200 and may be formed in a plurality of openings. The openings 165 provide an intake and exhaust and a coolant flow path, as shown by the arrows.

The multi-sided side surface wet thermal insulator 200 is applied in the form of a plurality of divided portions to contact the pressurizer outer wall 40.

7 is a perspective view of a wet thermal insulator 300 for preventing natural circulation of coolant according to another embodiment of the present invention.

Referring to Fig. 7, the cylindrical wet insulating material 300 will be described.

7, a laminated thermal insulating unit (not shown) is formed between the first and second thermal insulating protective plates 310 and 320, and the laminated thermal insulating unit is formed by a wet thermal insulating plate (not shown) (310) in the thickness direction. This has been described above in the description of Figs. 2 to 5.

The wet heat insulating material 300 is formed by forming the first and second heat insulating protective plates 310 and 320 in a cylindrical shape or continuously winding a long plate.

In the case where the first and second heat insulating protective plates 310 and 320 are formed in a cylindrical shape, the plurality of wet heat insulating plates are cylindrically shaped with different radii from each other, and the first and second heat insulating protective plates 310 and 320 Are arranged side by side. Therefore, the laminated heat insulating portion has a cylindrical shape having a predetermined thickness as a whole.

A gap filling zone (not shown) is installed in the space between the wet insulating plates 300 at the top and bottom of the wet insulating material 300. Accordingly, the sealing welded portion is also formed at the upper end portion and the lower end portion of the wet insulating material 300.

Also, an opening 365 is provided at the upper end of the wet thermal insulator 300, and an example in which four openings 365 are provided is shown. The openings 365 provide an intake and exhaust and a coolant flow path, as shown by the arrows.

The cylindrical side wall heat insulator 300 may be installed when the pressurizer outer wall 40 is cylindrical.

FIG. 8 is a perspective view of a wet thermal insulator 400 for preventing natural circulation of coolant according to another embodiment of the present invention, and FIG. 9 is a sectional view of FIG. 8. Fig. 10 is a detailed view of a portion C in Fig.

With reference to Figs. 8, 9 and 10, description will be made on the wet insulating material 400. Fig.

The wet thermal insulator 400 has a laminated thermal insulating part 430 formed between the first and second thermal insulating protective plates 410 and 420 and the wet thermal insulating plate 433 is disposed between the first thermal insulating protective plate 410, As shown in FIG. This has been described above in the description of Figs. 2 to 5.

The first and second heat insulating protective plates 410 and 420 are formed of a circular plate and the second thermal insulating protecting plate 420 is brought into contact with the presser bottom plate 60. A disk-shaped wet thermal insulation plate 433 is laminated a plurality of times in the thickness direction of the first thermal insulation protection plate 410 to form a laminated thermal insulation part 430 between the first and second thermal insulation protection plates 410 and 420. Due to such a structure, the laminated heat insulating portion 430 is formed in a disk shape as a whole.

The gap filling zone 450 is provided on the edge space between the wet insulation plates 433, that is, on the outer circumferential surface of the laminated insulating portion 430, and the sealing welded portion 460 is provided in the vicinity of the space where the gap filling band 450 is provided. And is formed on the outer peripheral surface of the heat insulating portion 430 to block the flow of the coolant.

A plurality of openings 465 may be formed in the sealing welded portion 460 of the outer circumferential surface of the laminated insulating portion 430. The openings 465 may be formed by a plurality of openings 465, A coolant flow path is provided.

A through hole 490 may be formed in the laminated thermal insulating part 430 and the first and second thermal insulation protection plates 410 and 420. The through hole 490 may be formed in a direction parallel to the center axis of the first thermal insulation protection plate And can be formed through. The through holes 490 may be formed in a plurality of the first and second heat insulating protection plates 410 and 420.

A gap filling band 450 may be provided on the inner circumferential surface of the through hole 490 and a sealing welded portion 460 may be formed to prevent the coolant from flowing into the laminated insulating portion 430. The sealing welded portion 460 may be formed by surface sealing welding, for example.

A fixed welding portion 470 is formed between the pressurizing device bottom plate 60 and the second thermal insulating protective plate 420 to fix the bottom wet thermal insulating material 400 to the pressurizing device bottom plate 60, Thereby blocking the circulation path of the coolant. The stationary weld 470 may be formed by linear seal welding.

The above-described wet insulation for preventing natural circulation of coolant is not limited to the configuration and the method of the embodiments described above, but the embodiments may be constructed by selectively combining all or a part of each embodiment so that various modifications can be made .

In addition, the detailed description of the invention described above is a concrete example for the inventors to carry out the invention as an embodiment of the present invention, and the applicant's right is not limited thereto. The applicant's rights are set forth in the claims set forth below.

10, 100, 200, 300, 400: wet insulation
20: reactor cover, 30: pressurizer space
40: pressurizer outer wall, 50: reactor inner space
60: presser bottom plate
110, 210, 310, 410: first insulation panel
120, 220, 320, 420: Second insulation panel
130, 430: laminated thermal insulating part
133, 433: Wet insulation board
135, 435:
150, 450: gap filling band
160, 260, 360, 460: sealing welded portion
165, 265, 365, 465:
170, 470: Fixed weld
180: Support
490: Through hole

Claims (16)

A first heat insulating material shielding plate having one surface exposed to the pressurizing space;
A second heat insulating material shield plate contacting the outer wall of the pressurizer;
A laminated thermal insulation unit disposed between the first thermal insulation protection plate and the second thermal insulation protection plate and having a plurality of protrusions protruding at regular intervals in a thickness direction of the first thermal insulation protection plate;
A gap filling band respectively installed in the space between the wet insulating plates so as to suppress the flow of the coolant in the space between the wet insulating plates; And
And a sealing weld portion formed between at least two of the wet heat insulating plate, the gap filling band, and the first and second heat insulating shield plates so as to prevent the coolant from flowing into the wet heat insulating plate by sealing welding,
Wherein the sealing weld is provided with an opening for forming an inlet so that the coolant is filled. The method according to claim 1,
Further comprising a support to which one side is fixed to the outer wall of the pressurizer,
Wherein the plurality of laminated thermal insulating parts are provided in a space between the plurality of laminated thermal insulating parts. delete The method according to claim 1,
Wherein the coolant natural-circulation-preventing wet heat insulator is divided into a plurality of portions, and one surface of the plurality of wet heat insulators is in contact with an outer wall of the presser. 3. The method of claim 2,
Wherein the gap filling band is provided at a space edge between the wet heat insulating plates,
Wherein the sealing weld portion is formed at an upper end portion, a lower end portion, and both side end portions of the laminated heat insulating portion. 6. The method of claim 5,
And an upper portion of the sealing welded portion is provided with an opening portion for forming an inlet so as to fill the coolant. 3. The method according to claim 1 or 2,
Wherein the first and second heat insulating protection plates are formed in a cylindrical shape,
Wherein the plurality of wet heat insulating plates are laminated in a cylindrical shape having radii different from each other or formed in a plurality of layers by continuously winding the plate and arranged in parallel with the first and second heat insulating protective plates, Wherein the heat insulating portion has a cylindrical shape with a predetermined thickness. 8. The method of claim 7,
Wherein the gap filling band is provided in a space between the upper and lower portions of the laminated heat insulating portion and between the wet insulating plates,
Wherein the sealing weld portion is formed at an upper end portion and a lower end portion of the laminated heat insulating portion. 9. The method of claim 8,
And an upper portion of the sealing welded portion is provided with an opening portion for forming an inlet so as to fill the coolant. The method according to claim 1,
Further comprising a fixed welded portion welded to the outer wall of the pressurizing unit so as to block the circulation path of the coolant. A first heat insulating material shield plate formed from a disc and having one surface exposed to the pressurizing space;
A second heat insulating material protection plate formed as a disc and contacting the presser bottom plate;
A laminated thermal insulation plate disposed between the first thermal insulation protection plate and the second thermal insulation protection plate and having a protrusion protruding at regular intervals, the thermal insulation plate having a disk shape is laminated a plurality of times in the thickness direction of the first thermal insulation protection plate;
A gap filling band provided in an edge space between the wet insulating plates so as to prevent the flow of the coolant in the space between the wet insulating plates; And
A sealing weld portion formed between at least one of the wet heat insulating plate, the gap filling band, and the first and second heat insulating shield plates at the outer peripheral surface of the laminated heat insulating portion to prevent the coolant from flowing into the wet heat insulating plate by sealing welding Wet insulation for preventing circulation of coolant. 12. The method of claim 11,
Wherein a sealing weld portion of the outer circumferential surface of the laminated heat insulating portion is provided with an opening portion for forming an inlet so as to fill the coolant. 12. The method of claim 11,
Wherein at least one through-hole is formed in the laminated thermal insulating part, the first and second thermal insulation protection plates so as to pass in a direction parallel to the central axis of the first thermal insulation protection plate,
Wherein the sealing weld portion is formed on an inner circumferential surface of the through hole so as to prevent the coolant from flowing into the space between the heat insulating plates. 14. The method of claim 13,
Wherein the through hole is formed concentrically with the first heat insulating material protecting plate. 12. The method of claim 11,
Further comprising a fixed welded portion for welding the sealing welded portion to the pressurizing device bottom plate and blocking the circulation path of the coolant. The method according to claim 1 or 11,
Wherein the gap filling band is formed to have a thickness such that the protrusion is formed so as to protrude so as to fill the gap between the wet insulation plates.

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