KR20220063693A - Membrane-type Liquefied Gas Insulation System with Double Metal Barrier Structure - Google Patents

Abstract

An objective of the present invention is to provide a membrane-type liquefied gas insulation system capable of securing better performance than a conventional technique in the aspect of both insulation and airtightness. The membrane-type liquefied gas insulation system of a double metal barrier structure comprises: a secondary insulation layer consisting of a plurality of secondary insulation panels arranged on an inner wall of a storage container; a secondary membrane installed on an upper portion of the secondary insulation layer; a primary insulation layer consisting of a plurality of primary insulation panels arranged on the secondary membrane; a primary membrane installed on an upper portion of the primary insulation layer; and a fixing device installed to penetrate the secondary insulation panels from the inner wall of the storage container to fix the primary insulation panels. The fixing device includes: a base socket installed on the inner wall of the storage container; a lower rod coupled to the base socket by a ball joint and penetrating the secondary insulation panels to be extended upwards; a connector coupled to the upper end of the lower rod and mounted on the upper surface of the secondary insulation panels; an upper rod coupled to a socket provided on an upper portion of the connector by a ball joint and extended upwards; a flat washer inserted into the upper rod and supported on the surface layer of a lower portion of the primary insulation panels to vertically restrict the primary insulation panels; and a fixing nut fastened to the upper rod to fix the flat washer.

Description

Membrane-type Liquefied Gas Insulation System with Double Metal Barrier Structure}

The present invention relates to a membrane type liquefied gas insulation system of a double metal barrier structure built inside a liquefied gas cargo hold or fuel tank provided on a liquefied gas carrier or the like.

Natural gas is transported in gaseous form through onshore or offshore gas pipelines or stored in LNG carriers as liquefied natural gas (hereinafter 'LNG') and transported to remote consumers. LNG is obtained by cooling natural gas to a cryogenic temperature (about -163°C), and its volume is reduced to about 1/600 of that of gaseous natural gas, so it is very suitable for long-distance transportation by sea.

In offshore structures for transporting or storing LNG, such as an LNG carrier for loading and unloading LNG to an onshore destination by navigating the sea, a specially designed storage tank (often called a ‘cargo hold’) that can safely store cryogenic LNG for a considerable period of time also called) is installed.

LNG storage tanks can be classified into independent type and membrane type depending on whether the load of cargo acts directly on the insulation. In general, membranous storage tanks have a double sealing structure in which a secondary insulation layer, a secondary barrier, a primary insulation layer, and a primary barrier are sequentially stacked on the inner wall of the hull. There is this.

The NO 96 type storage tank consists of insulation boxes in which the primary and secondary insulating layers are filled with insulating materials such as perlite powder or glass wool inside the plywood box, and each A barrier is formed by installing an invar steel (36% nickel steel) membrane with a thickness of 0.5 to 0.7 mm on the top of the insulation box constituting the insulation layer.

In this NO 96 type storage tank, the primary and secondary barriers have almost the same level of liquid-tightness and strength, so in the event of leakage of the primary barrier, only the secondary barrier can safely support cargo for a considerable period of time, and it is composed of an insulated box. The insulating layer to be used can have high compressive strength and rigidity, and has the advantage of high welding automation rate.

On the other hand, the MARK Ⅲ type storage tank is composed of insulation panels in which the insulation layer is formed by bonding wood plywood to the upper or lower surface of polyurethane foam (PUF), and the upper portion of the primary insulation layer is approximately 1.2 mm thick. A first barrier is formed by installing a stainless steel (SUS) membrane of

This MARK Ⅲ type storage tank has the advantage of excellent insulation effect of insulation panels based on polyurethane foam insulation, but the insulation panel has flexible properties and is vulnerable to thermal deformation or hull deformation. As such, it is difficult to apply an Inba steel membrane with a small coefficient of heat shrinkage. Therefore, in the MARK Ⅲ type storage tank, a stainless steel membrane with corrugated corrugations is applied as the primary barrier to form an insulation system to absorb the deformation of the membrane.

In addition, since the corrugated membrane is not easy to install between the insulating layers disposed on top and bottom due to its structural characteristics (there is a difficulty in construction due to interference between the corrugation of the membrane and the insulating layer), in the current MARK Ⅲ type storage tank, a tree instead of a metal membrane A secondary barrier is constructed using a flex, but this structure has a disadvantage in that the primary and secondary barriers are both vulnerable to airtightness compared to an insulating system made of a metal material.

An object of the present invention is, in a liquefied gas cargo hold or fuel tank provided in a liquefied gas carrier, etc., the primary and secondary insulation layers are composed of insulation panels with excellent thermal insulation performance, and both the primary and secondary barriers are made of metal membranes. By enabling application, it is intended to provide a membrane type liquefied gas insulation system that can secure superior performance compared to the existing ones in terms of both insulation and airtightness.

In addition, in the present invention, by designing the same size of the insulating panels constituting the primary and secondary insulating layers, and by deleting other processing than holes or grooves for fixing devices in each insulating panel, the number of times due to step processing, etc. increases and Another object is to specify the structure of the membrane type liquefied gas insulation system that can avoid the problem of strength degradation.

According to one aspect of the present invention for achieving the above object, a secondary heat insulating layer composed of a plurality of secondary heat insulating panels arranged on the inner wall of the storage container; a secondary membrane installed on the second insulating layer; a primary insulating layer composed of a plurality of primary insulating panels arranged on the secondary membrane; a first membrane installed on the first insulating layer; and a fixing device installed to pass through the secondary insulation panel from the inner wall surface of the storage container to fix the primary insulation panel, wherein the fixing device includes: a base socket installed on the inner wall surface of the storage container; a lower rod coupled to the base socket by a ball joint and extending upwardly through the secondary insulation panel; a connector coupled to the upper end of the lower rod and seated on the upper surface of the secondary insulation panel; an upper rod coupled to a socket provided on the connector by a ball joint and extending upward; a flat washer fitted to the upper rod and supported on the lower surface layer of the primary insulating panel to constrain the primary insulating panel in a vertical direction; and a fixing nut fastened on the upper rod to fix the flat washer, a membrane-type liquefied gas insulation system having a double metal barrier structure may be provided.

The fixing device may further include a spring washer interposed between the flat washer and the fixing nut to absorb deformation.

A through hole is formed in the central portion of the secondary insulation panel so that the lower rod can be inserted therethrough, and a fixing groove is formed in the four corners of the primary insulation panel to partially expose the lower surface layer to support the flat washer. can be formed.

The secondary insulating panel and the primary insulating panel may be manufactured to have the same size except for the processing shape of the through hole and the fixing groove.

The primary insulating panel and the secondary insulating panel are cross-arranged so that a corner portion of the primary insulating panel is positioned at the upper center of the secondary insulating panel, and the fixing is installed through the center of the secondary insulating panel The secondary insulation panel and the primary insulation panel may be fixed at the same time by the device.

The fixing device further includes a plug member for closing the empty space generated in the forming portion of the fixing groove between the adjacent primary heat insulating panels, wherein the plug member is, polyurethane foam or glass fiber reinforced poly Insulation made of urethane foam; Upper and lower plywood attached to the upper and lower surfaces of the insulating material; a fastening part fixed to the lower end of the lower plywood attached to the lower surface of the insulating material and bolted to the upper end of the upper rod; And it may include an anchoring plate fixed to the upper surface of the upper plywood attached to the upper surface of the insulating material.

Membrane-type liquefied gas insulation system of a double metal barrier structure according to an aspect of the present invention is disposed over the upper surface of the secondary insulation panel adjacent to each other, and the secondary membrane is a strip-shaped secondary in which the secondary membrane is fixed by welding. Membrane fixing unit; and a strip-shaped primary membrane fixing part installed at a boundary between the adjacent primary insulating panels and fixed by welding to the primary membrane, wherein the secondary membrane fixing part has an end portion of the connector is fixed by, and the end of the first membrane fixing part may be fixed by the anchoring plate.

The secondary membrane fixing part is fixed at an end of which is welded to the connector or inserted into a groove formed in a side of the connector, and the primary membrane fixing part has an end welded to the anchoring plate or a side of the anchoring plate It can be fixed in the form of being inserted into the groove formed in the.

The connector and the secondary membrane fixing part are seated on the upper surface of the secondary insulation panel, and the connector and the secondary membrane fixing part are seated in a protruding form without separate processing on the upper surface of the secondary insulation panel, The primary membrane fixing part is seated on the upper surface of the edge of the primary insulating panel, and the primary membrane fixing part is mounted on the top surface of the primary insulating panel in a protruding form without additional processing, the connector, the 2 Due to the protruding structure of the primary membrane fixing part and the primary membrane fixing part, the space generated between the secondary insulating layer and the secondary membrane and between the primary insulating layer and the primary membrane has a thickness corresponding to the space. The structure can be supplemented by placing spacers.

The spacer may be made of a composite or plywood material reinforced with glass fibers.

Membrane type liquefied gas insulation system having a double metal barrier structure according to the present invention applies a metal membrane as both a primary and a secondary barrier to form a seal by welding, thereby providing not only liquid tightness but also perfect gas tightness (gas tightness) ) is possible.

In addition, the membrane type liquefied gas insulation system of the double metal barrier structure according to the present invention has an advantage in that the insulation layer is composed of an insulation panel based on a polyurethane foam-based insulation material, so that the insulation performance is excellent.

In addition, the membrane type liquefied gas insulation system of the double metal barrier structure according to the present invention has a structure in which the primary insulation layer and the secondary insulation layer are cross-arranged with each other, and can minimize thermal bridges occurring in the insulation layer, Alternatively, it may have an effect of dispersing/reducing deformation in the thickness direction of the heat insulating layer with respect to various loads generated inside the fuel tank.

In addition, in the membrane type liquefied gas insulation system of the double metal barrier structure according to the present invention, the size of the insulation panel constituting the first insulation layer and the second insulation layer is designed to be the same, and a hole for installing a fixing device in each insulation panel Alternatively, by deleting machining other than the groove, there is an effect of avoiding an increase in the number of hours and a decrease in strength due to step machining or the like.

At this time, in the membrane type liquefied gas insulation system of the double metal barrier structure according to the present invention, a spacer that can serve as a structural support while blocking the heat flow in the space generated by the fixing device installed on the insulation layer is disposed. By doing so, it is possible to design the insulation system so that no processing other than holes or grooves is made in the insulation panel constituting the insulation layer, thereby further maximizing the effect of avoiding the problem of increasing the number of hours as described above.

In addition, the present invention has a structure capable of absorbing hull deformation through a double-actuated ball joint structure capable of rotational movement in connecting and fixing the insulation layer and the membrane in the insulation system of the double metal barrier structure, and has a structure capable of absorbing deformation of the hull through a spring , by providing a fixing device to which the primary insulating layer and the membrane fixing part can be slidably fixed, it is possible to easily respond to hull deformation and to build a structurally stable thermal insulation system.

The effects of the present invention are not limited to the above-described effects, and other effects not mentioned will be clearly understood from the following description.

1 is a perspective view schematically showing the structure of a liquefied gas insulation system according to the present invention.
2 is a view showing a heat insulating panel constituting a heat insulating layer in the liquefied gas heat insulating system according to the present invention, (a) is a perspective view showing a secondary heat insulating panel, (b) is a perspective view showing a primary heat insulating panel.
3 is a perspective view showing the cross-arranged structure of the primary and secondary thermal insulation layers in the liquefied gas thermal insulation system according to the present invention.
4 is a plan view showing the cross arrangement structure of the primary and secondary insulating layers in the liquefied gas insulating system according to the present invention.
5 is a side cross-sectional view schematically showing the structure of the liquefied gas insulation system according to the present invention.
6 is a side cross-sectional view showing the installation structure of the fixing device for fixing the insulating layer and the membrane in the liquefied gas insulation system according to the present invention.
7 is a perspective view showing a structure in which a secondary barrier is installed in the liquefied gas insulation system according to the present invention.
8 is a perspective view showing a secondary membrane fixing part according to the present invention.
9 is a perspective view showing a structure in which the primary barrier is installed in the liquefied gas insulation system according to the present invention.
10 is a view showing a primary membrane fixing unit according to the present invention, (a) is a perspective view and (b) is a cross-sectional view.
11 is a perspective view showing a spacer installed in the liquefied gas insulation system according to the present invention.
12 is a side view showing various modifications of the spacer according to the present invention.
13 is a side view showing a structure in which an insulating type gap insulating material is disposed between secondary insulating panels adjacent to each other in the liquefied gas insulating system according to the present invention.
14 is a view showing various modifications of the insulating gap insulating material according to the present invention.
15 is a side view showing a structure in which a support-type gap insulator is disposed between primary insulation panels adjacent to each other in the liquefied gas insulation system according to the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

In the present specification, liquefied gas is stored at a low temperature such as LPG (Liquefied petroleum gas), LEG (Liquefied Ethane Gas), liquefied ethylene gas, liquefied propylene gas, etc., including the most representative LNG. / It can be transported and can be interpreted as meaning including all of various types of liquefied gas that can be consumed as fuel for engines, etc. in a vaporized state.

In the present invention, the use of the terms 'primary' and 'secondary' refers to whether the primary sealing or insulation function is based on the liquefied gas stored in the storage container (or storage tank) constituting the cargo hold or fuel tank. It is used as a classification standard for whether it functions as a secondary sealing or insulation.

Also, the customarily applied terms 'top' or 'above' refer to the direction toward the inside of the reservoir irrespective of the direction to gravity, likewise the terms 'bottom' or 'down' are related to the direction to gravity. It refers to the direction toward the outside of the storage container without

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in each figure indicate like elements.

According to the present invention, in liquefied gas cargo holds and fuel tanks provided in liquefied gas carriers, etc., the primary and secondary insulating layers are composed of insulating panels with excellent thermal insulation performance, and metal membranes can be applied as both primary and secondary barriers. It is to specify the structure of the insulation system that makes it possible. Hereinafter, the barrier will be described with the term 'membrane' unified.

The structure of the liquefied gas insulation system according to the present invention will be described in detail with reference to FIGS. 1 to 15 . For reference, in the drawings attached to the specification, it is revealed that some components may be excluded from the illustration or the sizes of components may be exaggerated so that the structure of the insulation system can be clearly understood. Specifically, in FIG. 1, the configuration of the secondary membrane 200 and the primary membrane 400 is excluded from the illustration, and in FIGS. 3 and 4, in order to clearly show the structure of the cross arrangement between the heat insulating layers 100 and 300, the heat insulating layer 100 , 300) except for the insulating panels 110 and 310 constituting the other components are excluded.

Referring to the accompanying drawings, the liquefied gas insulation system according to the present invention is a secondary heat insulating layer 100, secondary It has a double sealing structure in which the membrane (Secondary membrane, 200), the primary heat insulating layer 300 and the primary membrane (Primary membrane, 400) are sequentially stacked.

The insulation layers 100 and 300 are the main insulation functions in the present insulation system, that is, to prevent heat intrusion from the outside of the storage container, and are installed between the inner wall surface H of the storage container and the secondary membrane 200 . It may be divided into a double heat insulating layer including the secondary heat insulating layer 100 that is used, and the primary heat insulating layer 300 installed between the secondary membrane 200 and the first membrane 400 .

The heat insulating layers 100 and 300 may be formed by sequentially arranging a plurality of heat insulating panels 110 and 310, respectively. Specifically, the secondary thermal insulation layer 100 is a plurality of secondary thermal insulation panels 110 are arranged one after another on the inner wall surface (H) of the storage container, and the primary thermal insulation layer 300 is a plurality of primary thermal insulation panels ( 310 may be formed as the secondary heat insulating layer 100 and the secondary membrane 200 are sequentially arranged on the upper side.

Referring to FIG. 2 , the structure of the heat insulation panels 110 and 310 constituting the heat insulation layers 100 and 300 can be confirmed in more detail. The secondary and primary insulation panels 110 and 310 use glass fiber reinforced polyurethane foam (R-PUF) as the core materials 111 and 311, and plywood and/or glass fiber reinforced composite material is used as the surface layer part 112 , 312) may be manufactured as a sandwich panel in the form of an approximately hexahedron. Here, as the 'glass fiber-reinforced composite material', an epoxy in which glass fibers are reinforced as a thermosetting material or polypropylene in which glass fibers are reinforced as a thermoplastic material may be exemplified.

The surface layer portions 112 and 312 of the heat insulation panels 110 and 310 may be formed by individually forming a composite material reinforced with plywood or glass fiber, or by combining two materials, and may be formed on the upper surface of the core material 111 or 311 or It may be formed attached to the lower surface or both the upper and lower surfaces.

In this thermal insulation system, the primary thermal insulation layer 300 and the secondary thermal insulation layer 100 may be cross-arranged with each other for the purpose of minimizing the thermal bridge phenomenon and promoting structural stability. The vertex position of the primary thermal insulation panel 310 constituting the primary thermal insulation layer 300, as shown in FIGS. 3 and 4, means that the primary thermal insulation layer 300 and the secondary thermal insulation layer 100 are intersected with each other. is located in the upper central portion of the secondary thermal insulation panel 110 constituting the secondary thermal insulation layer 100 , and the vertex position of the secondary thermal insulation panel 110 is located in the lower central portion of the primary thermal insulation panel 310 . means

In addition, in the present thermal insulation system, the secondary thermal insulation panel 110 and the primary thermal insulation panel 310 may be formed to have the same length, width, and thickness of the panel. That is, the secondary insulating panel 110 and the primary insulating panel 310 are manufactured using the same material as described above and have the same size as the secondary insulating layer 100 and the primary insulating layer 300 . ) can be commonly used as a member constituting the

However, since the secondary thermal insulation panel 110 and the primary thermal insulation panel 310 may have different processing forms for installation of a fixing device 700 to be described later, the secondary thermal insulation panel 110 and the primary thermal insulation A brief look at the processing form of the panel 310 will be passed.

First, the secondary insulation panel 110 is to be fixed and supported on the inner wall surface (H) of the storage container using an adhesive and load support material such as stud bolts and resin or mastic. In this case, the stud bolts provided on the inner wall surface (H) of the storage container fix the four corners of the secondary insulation panel 110 . To this end, the first through-holes 114 may be formed at the four corners of the secondary insulation panel 110 so that studs provided on the inner wall surface H of the storage container can be inserted therethrough. In addition, a second through hole 115 may be formed in the center of the secondary heat insulation panel 110 so that a fixing device 700 to be described later can pass therethrough.

On the other hand, as will be described later, the primary insulating panel 310 has a structure in which the lower end is fixed by a flat washer 760 included in the fixing device 700 installed through the secondary insulating panel 110, and for this purpose, 1 Sector-shaped fixing grooves 314 may be machined at the four corners of the car insulation panel 310 . This fixing groove 314 may be processed in a portion except for the lower surface layer part 312 of the primary heat insulation panel 310, so that the lower surface layer part 312 of the primary heat insulation panel 310 is partially exposed. . The flat washer 760 is supported by the exposed portion of the lower surface layer 312 to constrain the lower end of the primary insulating panel 310 .

In this insulation system, the insulation panels 110 and 310 constituting the insulation layers 100 and 300 are materials constructed in consideration of the temperature and load conditions added to each wall surface of the storage container constituting the liquefied gas cargo hold or fuel tank. Irrespective of that the type or physical properties (density, etc.) of 310) can be used in common by changing only the processing form.

In addition, the shape of the insulation panels 110 and 310 may be slightly changed at the boundary part between the corner part where one wall surface and another wall surface of the storage container meet and the flat part adjacent thereto, but in the corresponding area, except for the processing shape, the shape is the same. Insulation panels 110 and 310 having a structure may be commonly used.

In this way, the present insulation system has the same material and size of the insulation panels 110 and 310 constituting the secondary insulation layer 100 and the first insulation layer 300, so that the insulation panels 110 and 310 from the primary vendor. It is possible to achieve the effect of reducing the cost when manufacturing.

In the accompanying drawings, the width and length of the heat insulation panels 110 and 310 are 1:1 ratio, and the cross section of the square cross-section is presented as an embodiment, but the present invention is not limited thereto. The cross section may be provided in a rectangular shape. However, even in such a case, the length of the heat insulating panels 110 and 310 is preferably formed to be an integer multiple of the width from the standpoint of installation such as cross arrangement.

In addition, in the case of an insulation system having a shape of a double insulation layer divided up and down like this insulation system, if the densities of the upper and lower insulation panels are differently formed, the load is concentrated on the side with the lower density, which may cause a larger deformation. , in the present invention, the size as well as the physical properties of the secondary insulation panel 110 and the primary insulation panel 310 installed in the same area are configured to be the same to prevent the above-mentioned problems from occurring and improve the structural stability of the insulation system can be promoted

In this insulation system, the membranes 200 and 400 are installed on top of each insulation layer 100 and 300 to seal the liquefied gas, and the primary membrane 400 is in direct contact with the cryogenic liquefied gas to provide Sealing is performed, and the secondary membrane 200 performs secondary sealing of the liquefied gas in preparation for occurrence of leakage in the primary membrane 400 . The secondary membrane 200 is designed to support the load of the liquefied gas for a considerable period of time when the primary membrane 400 leaks and to be liquid-tight.

The liquefied gas insulation system according to the present invention is mainly characterized by using a membrane made of a metal material as the primary and secondary membranes 400 and 200 to ensure perfect airtightness of the liquefied gas accommodated therein.

The primary and secondary membranes 400 and 200 may be made of a metal material with strong low-temperature brittleness to cope with stress changes caused by cryogenic liquefied gas, for example, low-temperature steel such as stainless steel, Invar steel, or aluminum alloy is used. can be

Preferably, the primary and secondary membranes 400 and 200 may be configured by using a membrane made of stainless steel or Invar steel, which is a metal that can be used up to cryogenic temperatures, in a corrugated form or a flat plate form.

More preferably, in the present thermal insulation system, the primary and secondary membranes 400 and 200 may be made of a stainless steel membrane, and as shown in FIG. By having it, it is possible to easily absorb the heat shrinkage deformation caused by the cryogenic temperature of the liquefied gas.

The corrugations formed in the membranes 200 and 400 may include longitudinal corrugations formed in the longitudinal direction of the storage container and transverse corrugations formed in a direction perpendicular thereto, and longitudinal corrugations. A plurality of and transverse wrinkles are formed side by side on the membranes 200 and 400, respectively, and may have a lattice shape as a whole. A cross corrugation may be formed at a portion where the bidirectional wrinkles cross each other.

In this thermal insulation system, the wrinkles formed on the primary membrane 400 are formed in a raised shape in the inner direction of the storage container, and the wrinkles formed in the secondary membrane 200 are formed in a raised shape in the inner direction of the storage container. Thus, the direction of the wrinkles formed on the two membranes 200 and 400 may be formed in opposite directions.

Here, the wrinkles formed on the primary membrane 400 are raised in the inner direction of the storage container, and there is no need to discuss whether to interfere with the primary heat insulating layer 300, but in the case of the secondary membrane 200, it is disposed at the bottom Interference with the secondary heat insulating layer 100 may be a problem.

In order to solve this problem, the present invention forms the gap between the wrinkles formed in the secondary membrane 200 to correspond to the width or length of the secondary thermal insulation panel 110 constituting the secondary thermal insulation layer 100, 2 The corrugations of the primary membrane 200 may be disposed within the gap between the secondary insulating panels 110 .

That is, the present insulation system allows the wrinkles formed in the secondary membrane 200 to be naturally accommodated within the gap between the secondary insulation panels 110 adjacent to each other, thereby avoiding interference with the wrinkles of the secondary membrane 200 . No separate processing is required for the secondary heat insulation layer 100 or the first heat insulation layer 300, so the secondary membrane 200 made of a metal material between the second heat insulation layer 100 and the first heat insulation layer 300 is formed in a shape. It has the effect that it can be easily installed without any restrictions (regardless of whether wrinkles are included).

Hereinafter, the structure of the fixing device 700 for fixing the insulating layers 100 and 300 and the membranes 200 and 400 in the liquefied gas thermal insulation system according to the present invention will be described in detail with reference to FIG. 6 .

The present invention provides a fixing device 700 having a simplified structure so that the primary and secondary insulation panels 310 and 110 and the membranes 200 and 400 can be simultaneously fixed.

The fixing device 700 of the present insulation system is a base socket 710 installed on the inner wall surface H of the storage container, and a ball-joint coupled to the base socket 710, and secondary insulation A lower rod 720 extending upward through the panel 110, a connector 730 coupled to the upper end of the lower rod 720 and seated on the upper surface of the secondary insulation panel 110, and a connector; The ball joint is coupled to the socket 731 provided on the upper portion of the 730 and the upper rod 750 extending upwardly, and the upper rod 750 is fitted on the lower surface layer 312 of the primary insulating panel 310 on Between the flat washer (760) supported on the, and the fixing nut (770) fastened on the upper rod (750) to fix the flat washer (760), the flat washer (760) and the fixing nut (770) It includes a spring washer 780 that is interposed to absorb deformation, and a plug member 790 that is fastened to the upper end of the upper rod 750 to fill the empty space generated between the primary insulation panels 310 and close it. can do.

The base socket 710 may be fixed on the inner wall surface H of the storage container by welding or the like, and the lower rod 720 is rotated with a predetermined degree of freedom as the lower end of the lower rod 720 is ball-jointed to the base socket 710 . exercise is possible.

The lower rod 720 is inserted into the second through hole 115 formed in the center of the secondary heat insulation panel 110 and extends upward. That is, in this insulation system, the fixing device 700 penetrates the center of the secondary insulation panel 110 to fix the corner portion of the primary insulation panel 310, which is the primary and secondary insulation layers as described above. This is to implement the concept of cross arrangement between (300, 100).

The connector 730 is a plate-shaped plate, and a socket 731 for fastening with the upper rod 750 may be provided on the upper portion. At this time, the connector 730 is supported by the upper surface layer part 112 of the secondary heat insulating panel 110 , and thus may have a structure protruding upward with respect to the secondary heat insulating layer 100 .

This is to achieve the effect of saving time by configuring the insulation system so as not to require additional processing on the upper surfaces of the insulation panels 110 and 310, and for the space generated by such a protruding structure, the spacer 120 to be described later. It can be supplemented by arrangement. That is, the height step occurring between the secondary insulation panel 110 and the upper surface of the connector 730 may be supplemented by arranging the spacer 120 having a predetermined thickness in the corresponding space.

The upper rod 750 has a predetermined degree of freedom by being ball-joint coupled to the socket 731 provided on the connector 730 at the lower end thereof to enable rotational movement. That is, the fixing device 700 of the present invention can easily absorb the deformation of the heat insulation system, including the double ball joint coupling structure by the lower rod 720 and the upper rod 750 described above.

The flat washer 720 fastened on the upper rod 750 is supported on the exposed lower surface layer portion 312 of the corner portion exposed by the formation of the fixing groove 314 in the primary insulation panel 310, 1 It serves to constrain the lower end of the insulation panel 310 in the vertical direction.

In addition, the present insulation system more easily absorbs deformation of the insulation system by interposing a spring washer 780 capable of absorbing deformation between the flat washer 760 and the fixing nut 770 in addition to the double ball joint coupling structure described above. As a structure in which the primary insulation panel 310 is constrained only in the vertical direction by the fixing device 700 and is slidable within the allowable range in the horizontal direction, flexible behavior of the entire insulation system is possible, and thus the structural It may have the effect of improving stability.

The plug member 790 is a member that closes the empty space generated between the primary insulation panels 110 adjacent to each other by the installation of the fixing device 700, and is polyurethane foam (PUF) or glass fiber reinforced polyurethane foam. A heat insulating material 791 made of (R-PUF), a plywood 792 attached to the upper and lower surfaces of the heat insulating material 791, and a lower plywood 792 are fixed to the lower end of the upper rod 750 and bolted together It may include a fastening portion 793 that is used, and an anchoring plate 794 fixed to the upper surface of the upper plywood 792 by a member such as a rivet or a screw.

In the plug member 790, the insulating material 791 fills the corresponding space and mainly functions to insulate, and the upper/lower plywood 792 provides mechanical rigidity to the insulating material 791 and at the same time is a fastening part fixed to the lower part. (793) and is provided for the installation of an anchoring plate (794) fixed thereon. In addition, the fastening portion 793 of the plug member 790 may use a metal material, and may include a cap portion 793a having a screw thread to be bolted to the upper end of the upper rod 750 .

In the present thermal insulation system, the secondary membrane 200 may be welded to the connector 730 and a secondary membrane fixing part 500 to be described later so that fixing and sealing are formed on the secondary insulating layer 100 . In addition, the primary membrane 400 may be welded to the anchoring plate 794 and the primary membrane fixing part 600 to be described later to be fixed and sealed on the top of the primary heat insulating layer 300 .

Liquefied gas insulation system according to the present invention, the secondary membrane fixing part 500 for fixing the secondary membrane 200 on the upper portion of the secondary insulation layer 100, and the primary on the upper portion of the primary insulation layer 300 It may include a primary membrane fixing part 600 for fixing the membrane 400 .

In the present invention, separate processing (eg, step processing) is not performed except for hole or groove processing for installation of the fixing device 700 on the insulation panels 110 and 310 constituting the insulation layers 100 and 300 . It is possible to implement a thermal insulation system to prevent it, and for this purpose, the upper surfaces of the insulation panels 110 and 310 may be installed in the form of placing the membrane fixing parts 500 and 600 without additional processing. That is, in the present thermal insulation system, the membrane fixing units 500 and 600 may be installed in a protruding form on each of the thermal insulation layers 100 and 300, and spacers 120 and 320, which will be described later, for a space generated by such a protruding structure. ) can be supplemented by the arrangement of

Hereinafter, specific structures of the secondary membrane fixing unit 500 and the primary membrane fixing unit 600 will be sequentially described.

1, 7 and 8 For reference, the secondary membrane fixing unit 500 is a metal strip member in the form of a flat band disposed over the upper surface of the secondary insulating panel 110 adjacent to each other, from the center of the secondary insulating panel 110 to the neighboring It may be arranged to extend to the center of the other secondary heat insulation panel 110 .

In order to avoid interference with the lower folds formed in the secondary membrane 200 in the portion located at the boundary of the secondary insulation panel 110 adjacent to each other on the secondary membrane fixing part 500, a 'V' shape is formed. A bending part 501 may be formed.

The end of the secondary membrane fixing unit 500 may be fixed by the connector 730 of the above-described fixing device 700 . In this case, the secondary membrane fixing unit 500 may be fixed to the connector 730 by welding or may be fixed in the form of being inserted by forming a groove in the side of the connector 730 .

When the secondary membrane fixing part 500 is configured to be inserted into the connector 730, a predetermined tolerance is provided between the groove formed in the connector 730 and the end of the secondary membrane fixing part 500 to Partial sliding (sliding) of the secondary membrane fixing part 500 can be allowed, and therefore some sliding of the secondary membrane 200 fixed to the secondary membrane fixing part 500 is possible, so that the insulation system against cryogenic heat shrinkage may have the effect of further improving the structural stability of the

Only the end of the secondary membrane fixing unit 500 is fixed by the connector 730 , and it may not be separately fixed to the upper surface of the secondary insulating panel 110 . This will be described later, to minimize the portion where the secondary membrane fixing unit 500 receives mechanical force, and configure the insulation system to enable the secondary insulation panel 110 and the secondary membrane 200 to move relatively flexible with each other. it is for

The secondary membrane fixing unit 500 is installed between each secondary insulating panel 110 positioned on the front, back, left and right with respect to any one secondary insulating panel 110 , the center of the secondary insulating panel 110 . It may be arranged in a transverse form, and thus, when viewed as a whole of the secondary heat insulating layer 100, it has a lattice arrangement structure.

The secondary membrane 200 may be configured by continuously connecting unit membrane sheets 201 as shown in FIG. 7 , and the unit membrane sheet 201 is formed by a plurality of secondary membrane fixing units 500 . It is disposed in the grid space to be an edge portion can be welded on the secondary membrane fixing part (500). In this case, the edges of the adjacent unit membrane sheets 201 may be overlapped and welded to form a seal of the secondary membrane 200 .

Next, referring to FIGS. 1, 9 and 10 , the primary membrane fixing part 600 may be disposed above the gap between the primary insulating panels 310 adjacent to each other, and the adjacent primary insulating panels It may be arranged to cover the edges of the 310 at the same time.

Unlike the secondary membrane fixing part 500 that is arranged to cross the center of the secondary insulating panel 110 , the primary membrane fixing part 600 is disposed at the boundary between the adjacent primary insulating panels 310 . can be, and thus the secondary membrane fixing part 500 and the primary membrane fixing part 600 may be arranged to match the vertical positions.

On the other hand, in the case of the primary membrane 400 fixed by the primary membrane fixing part 600 , as a sealing function by direct contact with liquefied gas, the degree of thermal contraction deformation due to cryogenic temperature is higher than that of the secondary membrane 200 . Considering this, the primary membrane fixing unit 600 in the present insulation system may be provided in a rail type structure, not in a flat plate shape like the secondary membrane fixing unit 500 .

More specifically, the primary membrane fixing unit 600 is, as shown in FIG. 10 , an armrail strip 610 having an armrail 611 in the center along the longitudinal direction, and an armrail strip 610 on the It may include a wheel strip 620 having a female rail 611 formed on the , and male and female rails 621 coupled thereto, and to which the primary membrane 400 is fixed by welding.

The arm rail strip 610 may have an end fixed to the anchoring plate 794 of the fixing device 700 described above. In this case, the arm rail strip 610 may be fixed to the anchoring plate 794 through welding or may be fixed in the form of being inserted into a groove formed on the side of the anchoring plate 794 .

When the armrail strip 610 is configured to be inserted into the anchoring plate 794, some sliding (sliding) of the primary membrane fixing part 600 may be allowed in the secondary membrane fixing part 500 It can be applied in the same way as described.

In addition, only the end of the arm rail strip 610 is fixed by the anchoring plate 794, but separate fixation may not be made on the upper surface of the primary insulation panel 310, and accordingly, the primary membrane fixing part ( 600) minimizes the portion that receives mechanical force, and the primary insulating panel 310 and the primary membrane 400 can configure the insulating system to enable relatively flexible behavior with each other.

The wheel strip 620 is a plate-shaped metal plate having a predetermined area, and provides a portion to which the primary membrane 400 is fixed by welding.

The water rail 621 protruding from the lower surface of the vehicle rail strip 620 may be coupled to the female rail 611 formed in the center line along the longitudinal direction of the female rail strip 610 by male and female coupling. Here, 'male and female coupling' may refer to a form in which the carriage rail 621 is coupled to the female rail 611 in a fitting manner and is supported by the step structure of the female rail 6111, and thus the carriage rail strip 620 ) is constrained in the vertical direction, but has a structure in which sliding flow is possible along the longitudinal direction of the arm rail strip 610 .

Surail strip 620 coupled to one armrail strip 610 may be configured in a single number or may be configured in plurality. When a plurality of wheel strips 620 are separately configured, the plurality of vehicle rail strips 620 may be fastened along the longitudinal direction of the arm rail strip 610, and each of the vehicle rail strips 620 is independently formed. Since the sliding flow is possible, it is possible to more easily respond to the thermal contraction deformation of the primary membrane 400 . The allowable sliding distance may be adjusted by a tolerance provided between the plurality of separate wheel strips 620 .

In addition, the water rail strip 620 may be configured in a form separated according to the wrinkle interval of the primary membrane 400 . That is, the boundary portion between the plurality of track strips 620 may be disposed to correspond to the wrinkle position of the primary membrane 400 , and accordingly, each of the trailer strips 620 is formed of the primary membrane 400 . It can move more effectively corresponding to the wrinkle deformation and can absorb the deformation caused by thermal load and impact load. As shown in the figure, when the corrugation interval of the primary membrane 400 is uniform, as well as when the corrugation interval of the primary membrane 400 is non-uniform, the wheel strip 620 is configured according to the corresponding length. can do.

As described above, the primary membrane fixing part 600 of the present insulation system is the sliding of the rail strip 620 in addition to the sliding (sliding) when the arm rail strip 610 is fixed to the anchoring plate 794 in the insertion form. By having this possible structure, there is an effect that a more flexible behavior is possible in response to deformation of wrinkles when heat shrinkage of the primary membrane 400 by cryogenic temperature occurs.

Similar to the secondary membrane fixing unit 500 , the primary membrane fixing unit 600 may be disposed in a grid shape on the entire primary heat insulating layer 300 , and a unit membrane sheet constituting the primary membrane 400 . The edge portion of 401 may be fixed by welding on the rail strip 620 of the primary membrane fixing part 600 . In this case, the edges of the adjacent unit membrane sheets 401 may be overlap-welded to form a seal of the primary membrane 400 .

On the other hand, since the wrinkles formed in the primary membrane 400 have a raised shape toward the inner direction of the storage container, the bending part 501 like the secondary membrane fixing part 500 is on the primary membrane fixing part 600 . ) need not be formed.

In addition, in the case of the primary membrane 400 that is located closer to the cryogenic liquefied gas, the degree of heat shrinkage load that must be experienced is greater than that of the secondary membrane 200, so the wrinkles formed in the primary membrane 400 are reduced. The number may be greater than the number of secondary membranes 200 . That is, the interval between the wrinkles of the primary membrane 400 may be formed to be narrower than the interval between the wrinkles of the secondary membrane 200 .

As described above, in the liquefied gas insulation system according to the present invention, the end of the secondary membrane fixing part 500 and the primary membrane fixing part 600 is the connector 730 or the anchoring plate 794 of the fixing device 700 . ), and not directly fixed to the upper surface of the heat insulation panels 110 and 310, but is provided in a form capable of sliding flow.

In the known prior art, the thermal contraction behavior of the membrane and the insulating panel is subordinated by welding the membrane on an anchor strip mechanically fixed on the insulating panel. Therefore, a slit is processed for the purpose of preventing stress concentration due to heat shrinkage on the insulation panel, and a method of matching the position of the slit with the wrinkle position of the membrane is applied.

On the other hand, in this thermal insulation system, the behavior of the respective thermal insulation layers 100 and 300 and the membranes 200 and 400 installed thereon are not dependent on each other and relatively flexible behavior is possible. The slit processing can be eliminated, and even when the slit is processed, it is not necessary to match the position of the slit with the wrinkle position of the membrane, so it is possible to have the effect that a flexible design of the insulation system is possible.

On the other hand, provided between the primary insulating layer 300 and the secondary insulating layer 100 by deformation due to various loads occurring inside the storage container constituting the liquefied gas cargo hold or fuel tank, and the application of the double metal barrier structure. Depending on the arrangement of the membrane fixing parts 500 and 600 and the fixing device 700 , a space may be generated inside the insulation system.

The present insulation system intends to propose a structure in which the spacers 120 and 320 are arranged in the space so as to fill the space that may occur in the insulation system and to serve as a structural support at the same time as described above.

As the spacers 120 and 320, a composite material reinforced with glass fiber may be used, or it is possible to use a plywood material. Here, the 'composite material reinforced with glass fiber' may include, for example, a composite material such as epoxy reinforced with glass fiber as a thermosetting material or polypropylene reinforced with glass fiber as a thermoplastic material as described above. That is, as the material of the spacers 120 and 320 , a material equivalent to or higher than the material constituting the surface layer portions 112 and 312 of the heat insulating panels 110 and 310 may be used.

In the present thermal insulation system, the spacers 120 and 320 are preferably between the primary thermal insulation layer 300 and the secondary thermal insulation layer 100, more preferably in the arrangement of the membrane fixing parts 500 and 600 and the fixing device 700. Accordingly, it may be disposed in a space generated between the heat insulating layers 100 and 300 or between the heat insulating layers 100 and 300 and the membranes 200 and 400 .

In particular, as described above, the present insulation system has a structure in which the membrane fixing parts 500 and 600 and the fixing device 700 are disposed on the upper surface of the insulation panels 110 and 310 without separate processing. Therefore, it may be essential to arrange a structure capable of supporting a load in the space generated within the insulation system according to such an arrangement.

Referring to FIG. 11 , the spacers 120/320 may be manufactured in the form of a plate having a predetermined thickness so as to fill the space generated in the vertical direction in the thermal insulation system of the stacked structure.

In addition, as shown in FIG. 12, by attaching a material with high elasticity in the form of wool to either one or both surfaces of the upper and lower surfaces of the spacer 120/320 as the elastic surface layer 121/321, installation During this time, the spacer 120/320 including the elastic surface layer 121/321 is maintained in a compressed state, and when deformation occurs in the insulation system later, between the insulation layers 100 and 300 or between the insulation layers 100 and 300 and the membrane 200 , 400) to be filled by the expansion action of the elastic surface layer (121 / 321), it is possible to minimize the performance loss of the insulation system.

7 and 9, the structure in which the secondary spacer 120 is installed on the upper portion of the secondary heat insulating layer 100 and the structure in which the primary spacer 320 is installed on the upper part of the primary heat insulating layer 300 are respectively shown. there is.

Referring to FIG. 7 , in consideration of the fact that the lower wrinkle of the secondary membrane 200 is accommodated in the boundary between the secondary thermal insulation panels 110 in the secondary thermal insulation layer 100 , the boundary portion of the secondary thermal insulation panel 110 is The secondary spacer 120 may be installed in the excluded region. That is, the secondary spacer 120 installed on the secondary heat insulating layer 100 is located on the second insulating panel 110 in the remaining area except for the installation area of the secondary membrane fixing part 500 and the fixing device 700 . It can be installed to correspond.

Referring to FIG. 9 , the primary spacer 320 installed on the primary heat insulating layer 300 corresponds to the remaining area except for the installation area of the primary membrane fixing part 600 on the primary insulating panel 310 . can be installed.

The installation structure of the spacers 120 and 320 shown in FIGS. 7 and 9 is only a description of a preferred embodiment, and the present invention is not necessarily limited thereto. In the present invention, the spacers 120 and 320 can be applied to supplement the space wherever space is generated in the vertical direction inside the insulation system, and, as shown in FIG. 6 , the fixing device 700 is installed. In the region, heat flow in the microspace generated in the periphery of the spring washer 780 or the periphery of the lower rod 720 is reduced. A spacer (S) may be disposed for the purpose of blocking. In this case, it will be possible to determine whether the mechanical properties of the spacer S are necessary and to apply a material equivalent to or less than the material constituting the surface layer portions 112 and 312 of the heat insulating panels 110 and 310 .

In addition, when the secondary membrane 200 in the present thermal insulation system has a flat plate structure, there is no need to leave a boundary between the secondary thermal insulation panels 110 adjacent to each other, and the secondary spacers 120 are adjacent to each other. It may be configured to simultaneously cover the secondary heat insulation panel 110 that is.

According to the structure of the present invention, in which the spacers 120 and 320 composed of materials equivalent to or higher than the surface layer portions 112 and 312 of the insulation panels 110 and 310 are disposed in the space generated on the thermal insulation system of the laminate type as described above. , it has the effect of increasing the structural safety of the insulation system by performing a supporting role for various load conditions experienced by the insulation system.

In addition, since it is possible to supplement the space generated within the insulation system by arranging the spacers 120 and 320, the membrane fixing parts 500 and 600 and the fixing device are located on the upper surfaces of the insulation panels 110 and 310. In that a separate processing for installation of the 700 is not required, the advantages in terms of manufacturing, installation and management of the insulation system can be further maximized.

On the other hand, in this insulation system, between the insulation panels 110 and 310 constituting each insulation layer 100 and 300, the installation space of the fixing device 700, the wrinkle accommodation space of the secondary membrane 400, installation tolerance, etc. The arrangement is made with a predetermined gap in consideration. Since such a gap is a factor that may cause heat loss due to convection, a gap insulation is usually disposed in the space between the adjacent insulation panels 110 and 310 for the purpose of preventing heat loss. That is, if the above-described spacers 120 and 320 are filled in the space generated in the vertical direction in the thermal insulation system of the stacked structure, the gap insulating material is filled in the space generated in the horizontal direction in the thermal insulation system.

The present invention provides two types of gap insulators (800, 900) according to whether a load bearing function is required for the space generated between the insulating panels (110, 310).

First, referring to FIGS. 5 and 13 , the boundary between the secondary insulating panels 110 constituting the secondary insulating layer 100 is a space in which the folds of the secondary membrane 200, which is an upper structure thereof, are accommodated, and the secondary The need to have a load-bearing function for the membrane 200 is not great.

That is, in the gap between the secondary insulating panels 110, the heat insulating function rather than the load bearing function is the top priority, so the present invention arranges the insulating gap insulating material 800 between the secondary insulating panels 110 adjacent to each other. The insulation system can be configured to do this.

The insulating-type gap insulator 800 may be configured by combining the foam-type core 810 and the elastic material 820 with high elasticity, or may be configured as a single elastic material 820, and 2 adjacent to each other in a compressed state. It may be inserted into the space between the car insulation panels 110 . In this case, a film (film, etc.) may be attached to the elastic material 820 to limit or prevent ventilation of the material itself.

When the insulating gap insulating material 800 is composed of a combination of the foam-type core material 810 and the elastic material 820, the elastic material 820 may be provided in a form surrounding the outer surface of the core material 810. , As shown in (a) of FIG. 14, the elastic material 820 surrounds all the upper and lower surfaces and all four sides of the core 810, and as shown in FIG. 14 (b), the elastic material 820 is the core material. The upper and lower surfaces of the core 810 are all open by surrounding only the four sides of the 810 , and the elastic material 820 surrounds the upper and four sides of the core 810 as shown in FIG. 14 ( c ). , or as shown in (d) of FIG. 14 , the elastic material 820 may be provided in any one of the forms surrounding the lower surface and four sides of the core material 810 . In addition, when the insulating gap insulating material 800 is disposed in the space between the secondary insulating panels 110, as shown in FIG. The height of the 810 is reduced and the upper end of the elastic material 820 may be provided in a form including an inclined surface.

In the above, it has been described as a preferred embodiment that the heat insulating gap insulator 800 is disposed between the secondary heat insulating panels 110, but this is an example of a preferred arrangement position of the heat insulating gap insulator 800. However, the arrangement position of the insulating gap insulating material 800 is not necessarily limited thereto. When the gap space generated in the insulation system does not require a load-bearing function, for example, when it is built on the side or upper surface of the storage container, the insulation-type gap insulation 800 is also provided in the space between the primary insulation panels 310. batch can be applied.

Insulation-type gap insulator 800 is a method of compressing and inserting materials with relatively high elasticity into the space between the insulation layers. 820), it is possible to minimize heat loss through the space by filling the space additionally generated by the expansion action.

Next, referring to FIGS. 5 and 15 , at the boundary between the primary insulating panels 310 constituting the primary insulating layer 300 , there is a possibility that a flat part of the primary membrane 400 , which is the upper structure, will be positioned. And, in this case, there is a need to have a load-bearing function for the primary membrane 400 .

That is, when the flat portion of the primary membrane 400 is disposed above the gap between the primary insulation panels 310, it is structurally advantageous to have a load bearing function as well as a thermal insulation function, so the present invention provides a method for adjacent 1 The insulation system may be configured to dispose the support-type gap insulation 900 between the car insulation panels 310 .

The support-type gap insulator 900 has a core material 910 composed of a material equivalent to or higher than glass fiber reinforced polyurethane foam, which is the core material 111 and 311 of the insulation panels 110 and 310 with mechanical properties, is disposed in the central portion, and the side portion thereof It may be configured by combining an elastic material 920 with a high degree of elasticity capable of being compressed, and may be inserted into the space between the adjacent primary heat insulating panels 310 in a compressed state. In this case, a film (film, etc.) may be attached to the elastic material 920 to limit or prevent ventilation of the material itself.

In the above, it has been described as a preferred embodiment that the support-type gap insulator 900 is disposed between the primary insulation panels 310, but this presents an embodiment for a preferred arrangement position of the support-type gap insulator 900 However, the arrangement position of the support-type gap insulator 00 is not necessarily limited thereto. In this insulation system, the support-type gap insulation 900 can be applied to any area that requires a load bearing function as well as the space between the primary insulation panels 310, for example, the secondary membrane 200 is corrugated. In the case of being composed of a flat membrane without a gap, the support-type gap insulator 900 may be disposed even between the secondary insulation panels 110 .

In addition, it has been described above that the above-described insulating-type gap insulating material 800 can be disposed between the primary insulating panels 310 in an area that does not require a load-bearing function (eg, the side or upper surface of the storage container). , even when the corrugations of the primary membrane 400 are disposed on the upper part of the gap between the primary insulating panels 310 , the insulating gap insulating material 800 may be applied.

That is, in the present thermal insulation system, the arrangement position of the insulating type gap insulating material 800 and the supporting type gap insulating material 900 is not determined by whether the primary insulating layer 300 or the secondary insulating layer 100 is a load bearing function. It can be said that it depends on whether or not this is necessary.

The support-type gap insulator 900 is a method of compressing and inserting a core material 910 having relatively high mechanical properties (strength, etc.) and an elastic material 920 having high elasticity into the space between the heat insulating layers, and functions as a structural member. The core material 910 not only enables a load bearing function for the upper structure in the space between the heat insulation layers, but also expands the elastic material 920 even if an additional space is generated between the heat insulation layers due to deformation of the panel due to various loads such as heat shrinkage. Heat loss through the space can be minimized by filling the space additionally generated by the

Membrane type liquefied gas insulation system having a double metal barrier structure according to the present invention applies a metal membrane as both a primary and a secondary barrier to form a seal by welding, thereby providing not only liquid tightness but also perfect gas tightness (gas tightness) ) is possible.

In addition, the membrane-type liquefied gas insulation system of the double metal barrier structure according to the present invention has an advantage in that the insulation layer is composed of an insulation panel based on a polyurethane foam-based insulation material, so that the insulation performance is excellent.

In addition, the membrane type liquefied gas insulation system of the double metal barrier structure according to the present invention has a structure in which the primary insulation layer and the secondary insulation layer are cross-arranged with each other, and can minimize thermal bridges occurring in the insulation layer, Alternatively, it may have an effect of dispersing/reducing deformation in the thickness direction of the heat insulating layer with respect to various loads generated inside the fuel tank.

In addition, in the membrane type liquefied gas insulation system of the double metal barrier structure according to the present invention, the size of the insulation panel constituting the first insulation layer and the second insulation layer is designed to be the same, and a hole for installing a fixing device in each insulation panel Alternatively, by deleting machining other than the groove, there is an effect of avoiding an increase in the number of hours and a decrease in strength due to step machining or the like.

At this time, in the membrane type liquefied gas insulation system of the double metal barrier structure according to the present invention, a spacer that can serve as a structural support while blocking the heat flow in the space generated by the fixing device installed on the insulation layer is disposed. By doing so, it is possible to design the insulation system so that no processing other than holes or grooves is made in the insulation panel constituting the insulation layer, thereby further maximizing the effect of avoiding the problem of increasing the number of hours as described above.

In addition, the present invention has a structure capable of absorbing hull deformation through a double-actuated ball joint structure capable of rotational movement in connecting and fixing the insulation layer and the membrane in the insulation system of the double metal barrier structure, and has a structure capable of absorbing deformation of the hull through a spring , by providing a fixing device to which the primary insulation layer and the membrane fixing part can be slidably fixed, it is possible to easily respond to hull deformation and to build a structurally stable insulation system.

The present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, it should be said that such modifications or variations belong to the claims of the present invention.

100: secondary insulation layer
110: secondary insulation panel
111: heartwood
112: surface layer
114: first through hole
115: second through hole
120: secondary spacer
200: secondary barrier
300: primary insulation layer
310: primary insulation panel
311: heartwood
312: surface layer
314: fixed groove
320: primary spacer
400: primary barrier
500: secondary membrane fixing part
501: bending unit
600: primary membrane fixing part
610: arm rail strip
611: arm rail
620: wagon strip
621: wagon
700: fixture
710: base socket
720: lower rod
730: connector
750: upper rod
760: flat washer
770: fixing nut
780: spring washer
790: plug member
791: insulation material
792: Plywood
793: fastening part
794: anchoring plate
800: adiabatic gap insulation material
810: heartwood
820: elastic material
900: supported gap insulation
910: heartwood
920: elastic material

Claims (10)

a secondary thermal insulation layer composed of a plurality of secondary thermal insulation panels arranged on the inner wall of the storage container;
a secondary membrane installed on the second insulating layer;
a primary insulating layer composed of a plurality of primary insulating panels arranged on the secondary membrane;
a first membrane installed on the first insulating layer; and
and a fixing device installed to pass through the secondary insulating panel from the inner wall surface of the storage container to fix the primary insulating panel,
The fixing device is
a base socket installed on the inner wall surface of the storage container;
a lower rod coupled to the base socket by a ball joint and extending upwardly through the secondary insulation panel;
a connector coupled to the upper end of the lower rod and seated on the upper surface of the secondary insulation panel;
an upper rod coupled to a socket provided on the connector by a ball joint and extending upward;
a flat washer fitted to the upper rod and supported on the lower surface layer of the primary insulating panel to constrain the primary insulating panel in a vertical direction; and
Containing a fixing nut fastened on the upper rod to fix the flat washer,
Membrane type liquefied gas insulation system with double metal barrier structure. The method according to claim 1,
The fixing device is
Further comprising a spring washer interposed between the flat washer and the fixing nut to absorb deformation,
Membrane type liquefied gas insulation system with double metal barrier structure. The method according to claim 1,
A through hole is formed in the center of the secondary insulation panel so that the lower rod can be inserted therethrough,
It characterized in that fixing grooves are formed in the four corners of the primary insulation panel so that the lower surface layer part is partially exposed to support the flat washer,
Membrane type liquefied gas insulation system with double metal barrier structure. 4. The method according to claim 3,
The secondary insulating panel and the primary insulating panel are characterized in that the size is manufactured to be the same except for the processing shape of the through hole and the fixing groove,
Membrane type liquefied gas insulation system with double metal barrier structure. 4. The method according to claim 3,
The primary thermal insulation panel and the secondary thermal insulation panel are alternately arranged such that a corner portion of the primary thermal insulation panel is located in the upper center of the secondary thermal insulation panel,
characterized in that the secondary insulating panel and the primary insulating panel are fixed at the same time by the fixing device installed through the central portion of the secondary insulating panel,
Membrane type liquefied gas insulation system with double metal barrier structure. 6. The method of claim 5,
The fixing device is
Further comprising a plug member for closing the empty space generated in the forming portion of the fixing groove between the adjacent primary heat insulating panels,
The plug member,
Insulation material made of polyurethane foam or glass fiber reinforced polyurethane foam;
Upper and lower plywood attached to the upper and lower surfaces of the insulating material;
a fastening part fixed to the lower end of the lower plywood attached to the lower surface of the insulating material and bolted to the upper end of the upper rod; and
Comprising an anchoring plate fixed to the upper surface of the upper plywood attached to the upper surface of the insulating material,
Membrane type liquefied gas insulation system with double metal barrier structure. 7. The method of claim 6,
a strip-shaped secondary membrane fixing part disposed over an upper surface of the neighboring secondary insulating panels and fixing the secondary membrane by welding; and
It is installed at the boundary between the adjacent primary insulation panels and further comprises a strip-shaped primary membrane fixing part to which the primary membrane is fixed by welding,
The end of the secondary membrane fixing part is fixed by the connector,
The first membrane fixing part, characterized in that the end is fixed by the anchoring plate,
Membrane type liquefied gas insulation system with double metal barrier structure. 8. The method of claim 7,
The secondary membrane fixing part is fixed in such a way that the end is welded to the connector or inserted into a groove formed in the side of the connector,
The primary membrane fixing part is characterized in that the end is welded to the anchoring plate or fixed in such a way that it is inserted into a groove formed in the side of the anchoring plate,
Membrane type liquefied gas insulation system with double metal barrier structure. 8. The method of claim 7,
The connector and the secondary membrane fixing part are seated on the upper surface of the secondary insulation panel, and the connector and the secondary membrane fixing part are seated in a protruding form without separate processing on the upper surface of the secondary insulation panel,
The primary membrane fixing part is seated on the upper surface of the edge of the primary insulating panel, and the primary membrane fixing part is mounted on the upper surface of the primary insulating panel in a protruding form without additional processing,
Due to the protruding structure of the connector, the secondary membrane fixing part, and the primary membrane fixing part, the space generated between the secondary insulating layer and the secondary membrane and between the primary insulating layer and the primary membrane has a corresponding space. characterized in that the structure is supplemented by arranging a spacer having a thickness corresponding to
Membrane type liquefied gas insulation system with double metal barrier structure. 10. The method of claim 9,
The spacer is characterized in that it is composed of a composite or plywood material reinforced with glass fiber,
Membrane type liquefied gas insulation system with double metal barrier structure.

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