KR20230105292A - Vacuum insulated pipes - Google Patents

Abstract

The present invention discloses a vacuum insulated pipe. Specifically, a spool composed of an inner tube for transporting cryogenic LNG and an exterior in which a vacuum is formed inside while surrounding the inner tube, and both ends are combined with the exterior of both sides while surrounding a junction where the spool is joined to each other, and a vacuum is formed inside In the vacuum insulated double pipe comprising a jacket sleeve formed thereon and a support provided between the inner tube and the outer tube to support the inner tube, the coupling part for coupling both ends of the outer tube to the outer circumferential surface of the inner tube includes both ends of the outer tube. A ring-shaped large-diameter ring coupled to the inner circumference; A ring-shaped small-diameter ring coupled to the outer circumference of the inner tube; It consists of a circular pipe-shaped connecting pipe inserted between the exterior and the inner tube and connecting the large-diameter ring and the small-diameter ring, and the cross section is made of a shape such as 'd', and the support has a semicircular shape and the inner tube A first contact part in close contact with the outer circumferential surface, a first assembly part bent from both ends of the first contact part, a first elastic part extending inwardly from the first assembly part, and extending from the first elastic part, A belt-shaped first support consisting of a first pressing portion in contact with the inner circumferential surface of the exterior; A second contact portion having a semicircular shape and in close contact with the outer circumferential surface of the inner tube, a second assembly portion bent from both ends of the second contact portion and facing the first assembly portion, and extending inwardly from the second assembly portion, respectively. a band-shaped second support member comprising a second elastic part and a second pressing part extending from the second elastic part and contacting the inner circumferential surface of the outer shell; And a first fastening bar seated in the first assembly part, a second fastening bar seated in the second assembly part, and fastened while penetrating both ends of the first fastening bar and the second fastening bar, thereby connecting the first fastening bar and the second fastening bar. It is composed of a tightening bolt for applying a tightening force to the fastening bar, and assembly means for coupling the first assembly part and the second assembly part to each other; characterized in that it comprises a.

Description

Vacuum insulated pipes {Vacuum insulated pipes}

The present invention relates to a vacuum insulated pipe, and more particularly, to a vacuum insulated pipe that has a double pipe structure of an inner pipe and an outer pipe so as to transfer cryogenic LNG from a ship without heat loss, and insulates the pipe by vacuuming the space between the inner pipe and the outer pipe. it's about

In general, in order to supply fuel gas such as LNG to the engine room of a ship, a vacuum insulation pipe having a double pipe structure is used to wrap an inner pipe supplied with fuel gas with an outer surface at a certain space.

In addition, a vacuum is created between the inner tube and the exterior to insulate the inner tube to minimize heat transfer.

Since it is difficult to directly process and install the vacuum insulation pipe at the site, a spool of a double pipe structure is processed in advance at the factory, and then a plurality of spools are connected and piped at the site.

The connection method of the vacuum insulation pipe includes a bayonet method and a method of welding a jacket sleeve, and it is common to use a jacket sleeve mainly.

1 is a cross-sectional view showing a schematic structure of a conventional vacuum insulation pipe.

Conventional vacuum insulation piping is piped by continuously connecting an inner tube (1) for transporting cryogenic LNG and a spool (3) composed of an outer tube (2) in which the inner tube is inserted and accommodated to surround the inner tube in the field. And a vacuum insulation layer is formed between the exterior and the inner tube.

At this time, since the inner tube is exposed to the outside of both sides of the exterior, when connecting each spool in the field, the exposed inner tubes are joined by butting and welding.

In addition, the portion where the inner tube is connected is coupled to be surrounded by the cylindrical jacket sleeve 4, and a vacuum insulation layer is also formed inside the jacket sleeve.

In addition, a bellows 1a is formed in the middle of the inner tube to correspond to contraction and expansion.

However, in the case of the conventional vacuum insulation pipe, heat transfer occurs from the outer pipe to the inner pipe through the connection portion 5 in which the end of the outer pipe and the inner pipe are coupled, and the shorter the length, the faster the transfer.

In addition, since the jacket sleeve is welded to the external pipe in the field, there is a problem that the welding heat is directly transmitted to the external pipe and may affect the vacuum state in the external pipe.

In addition, a structure capable of improving the insulation effect of the vacuum insulation layer is further required.

Republic of Korea Patent Publication 10-2017-0059269 Korean Registered Patent No. 10-2111473 Korean Registered Patent No. 10-1448240 Korean Registered Patent No. 10-2050809 Republic of Korea Patent Publication 10-2019-0075657 Republic of Korea Patent Publication 10-2016-0074724

Therefore, the present invention was developed to solve the above-mentioned conventional problems, and an object of the present invention is to provide a vacuum insulation pipe having a structure in which heat transfer from the outside is minimized by extending the length of the coupling portion where the outer and inner pipes are coupled.

Another object of the present invention is to provide a vacuum insulation pipe having a structure that minimizes the transfer of welding heat generated during welding of the jacket sleeve to the exterior by positioning the position of the sleeve ring coupling the jacket sleeve and the exterior to the coupling portion. .

Another object of the present invention is to provide a vacuum insulation pipe capable of improving the insulation effect by inserting an insulation material into the vacuum insulation layer.

The vacuum insulation pipe according to the present invention for achieving the above object is a spool composed of an inner tube for transporting cryogenic LNG and an exterior in which a vacuum is formed inside while surrounding the inner tube, and a junction in which the spool is joined to each other In the vacuum insulated double pipe comprising a jacket sleeve having both ends coupled to the exterior of both sides and forming a vacuum inside, and a support provided between the inner tube and the exterior to support the inner tube, on the outer circumferential surface of the inner tube Coupling part for coupling both ends of the exterior, a ring-shaped large-diameter ring coupled to the inner circumference of both ends of the exterior; A ring-shaped small-diameter ring coupled to the outer circumference of the inner tube; It consists of a circular pipe-shaped connecting pipe inserted between the exterior and the inner tube and connecting the large-diameter ring and the small-diameter ring, and the cross section is made of a shape such as 'd', and the support has a semicircular shape and the inner tube A first contact part in close contact with the outer circumferential surface, a first assembly part bent from both ends of the first contact part, a first elastic part extending inwardly from the first assembly part, and extending from the first elastic part, A belt-shaped first support consisting of a first pressing portion in contact with the inner circumferential surface of the exterior; A second contact portion having a semicircular shape and in close contact with the outer circumferential surface of the inner tube, a second assembly portion bent from both ends of the second contact portion and facing the first assembly portion, and extending inwardly from the second assembly portion, respectively. a band-shaped second support member comprising a second elastic part and a second pressing part extending from the second elastic part and contacting the inner circumferential surface of the outer shell; And a first fastening bar seated in the first assembly part, a second fastening bar seated in the second assembly part, and fastened while penetrating both ends of the first fastening bar and the second fastening bar, thereby connecting the first fastening bar and the second fastening bar. Consisting of a tightening bolt for applying a tightening force to the fastening bar, assembly means for coupling the first assembly part and the second assembly part to each other; may be configured to include.

Here, a ring-shaped sleeve ring is coupled and sealed between the outer circumferential surface of the exterior and the end of the jacket sleeve, and the sleeve ring may be positioned between the large-diameter ring and the small-diameter ring.

In addition, a powder insulation material in a powder state is filled between the inner tube and the outer tube and between the jacket sleeve and the junction, and any one of pearlite, diatomaceous earth, and aluminum powder may be used as the powder insulation material.

Alternatively, the outer circumferential surface of the inner tube may be insulated by surrounding it with a multi-layer insulation material in which aluminum foil and glass wool are alternately laminated.

On the other hand, in order to reduce the resistance of the air flowing between the exterior and the inner tube, the first fastening bar and the second fastening bar are the first curved portion and the second curved portion facing the first assembly portion and the second assembly portion, respectively. , It consists of a first flat portion and a second flat portion facing the exterior may have a semicircular cross section.

In this case, the first support and the second support may be made of CFRP (Carbon Fiber Reinforced Plastic), and GFRP (Glass Fiber Reinforced Plastic) may be coated on outer surfaces of the first and second supports.

According to the present invention described above, there are the following effects.

First, it is possible to minimize heat transfer by maximally delaying the transfer of heat from the exterior to the inner tube by extending the length of the coupling part connecting the exterior and the interior tube in the shape of 'ㄹ'.

Second, by placing the sleeve ring that hermetically connects the jacket sleeve and the exterior to the joint, the welding heat generated when welding the jacket sleeve is delayed from being transferred to the exterior, and the transfer of heat from the jacket sleeve to the inner tube through the exterior is also delayed. Heat transfer can be minimized by delaying as much as possible.

Third, it is possible to improve the insulation effect compared to simple vacuum insulation by filling the exterior and the jacket sleeve with powder insulation or wrapping the inner tube with a multi-layer insulation.

Fourth, it is possible to block heat transferred from the support to the inner tube by inserting a support insulation material between the inner tube and the support.

1 is a cross-sectional view showing a schematic structure of a conventional vacuum insulation pipe
Figure 2 is a cross-sectional view showing a vacuum insulation pipe according to an embodiment of the present invention
Figure 3 is a perspective view showing the support of the present invention shown in Figure 2
Figure 4 is a longitudinal cross-sectional view showing a pipe supported by the support of the present invention shown in Figure 2
5 is a cross-sectional view showing a vacuum insulation pipe according to another embodiment of the present invention
6 is a cross-sectional view showing a vacuum insulation pipe according to another embodiment of the present invention
7 is a cross-sectional view showing a vacuum insulation pipe according to another embodiment of the present invention
8 to 10 are cross-sectional views showing a vacuum insulation pipe to which a diaphragm unit is applied in another embodiment of the present invention.

Hereinafter, an embodiment according to the present invention will be described in more detail with reference to the accompanying drawings.

For reference, the description with reference to the drawings is for easier understanding of the present invention, and the scope of the present invention is not limited thereto. And, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

2 is a cross-sectional view showing a vacuum insulation pipe according to an embodiment of the present invention.

In the present invention, a spool 100 composed of an inner tube 110 and an outer tube 120, a jacket sleeve 200 that vacuums the junction 112 of the two spools 100, and a support 300 supporting the inner tube 110 ) can be configured including.

First, the spool 100 will be described.

The spool 100 may be composed of an inner tube 110 and an outer tube 120 of a certain length.

The inner tube 110 and the outer tube 120 may have a pipe shape, and the inner diameter of the outer tube 120 is larger than the outer diameter of the inner tube 110 so that the inner tube 110 is inserted into the outer tube 120. , is accepted.

And the length of the inner tube 110 is formed longer than the exterior 120, so that the inner tube 110 protrudes from both ends of the exterior 120 and is exposed.

At this time, the coupling part 130 for coupling both ends of the exterior 120 to the outer circumferential surface of the inner tube 110, respectively, may be composed of a large diameter ring 131, a small diameter ring 132, and a connecting pipe 133. there is.

The large-diameter ring 131 is formed in a ring or washer shape, has an outer diameter identical to the inner diameter of the outer tube 120, and is coupled to the inner circumference of both ends of the outer tube 120, and the inner diameter is the outer diameter of the inner tube 110 formed larger.

And the small diameter ring 132 is made of a ring or washer shape, the inner diameter is formed the same as the outer diameter of the inner tube 110 is coupled to the outer circumferential surface of the inner tube 110, the outer diameter of the outer tube 120 formed smaller than the inner diameter.

The connection pipe 133 is formed in a circular pipe shape and is inserted between the outer pipe 120 and the inner pipe 110 . That is, the inner diameter of the connecting pipe 133 is larger than the outer diameter of the inner pipe 110, and the outer diameter of the connecting pipe 133 is smaller than the inner diameter of the outer pipe 120.

And, one end of the connection pipe 133 is coupled to the large-diameter ring 131, and the other end is coupled to the small-diameter ring 132.

At this time, the inner diameter of the large-diameter ring 131 and the outer diameter of the small-diameter ring 132 are formed identically, so that one end of the connection pipe 133 is coupled to the inner diameter of the large-diameter ring 131, and the other end is the same. It is preferable to be coupled to the outer diameter of the small diameter ring 132.

Accordingly, the coupling portion 130 may have a cross section of an approximate 'd' shape as shown.

Since the coupling part 130 is made of this structure, heat of the outer tube 120 exposed to the atmosphere is prevented from being rapidly transferred to the inner tube 110 .

In other words, since the length of the coupling part 130 is long, the transfer of heat to the inner tube 110 along the path of the coupling part 130 can be delayed.

This is because, since cryogenic LNG is being transported to the inner tube 110, it is necessary to block even minute heat transfer as much as possible.

For reference, a plurality of the spools 100 are manufactured in a factory and transported to an installation site to perform piping work.

At this time, the spools 100 are butt welded to each other. That is, the exposed inner tubes of the spool 100 face each other and butt welding is performed to join the inner tubes to each other.

In addition, a part of the inner tube 110 may be formed as a bellows 111 to respond to expansion and contraction.

In addition, a vacuum port 121 is formed on the outer circumferential surface of the exterior 120 to extract air by connecting a vacuum device. A powder filling port 122 is formed.

For reference, the vacuum pressure inside the exterior 120 is lowered to about 10 ^-3 Torr.

8 to 10 are cross-sectional views showing a vacuum insulation pipe according to another embodiment of the present invention.

Here, (a) of FIG. 8 is a view showing a cross section A-A' of FIG. 9, and (b) of FIG. 8 is a view showing a cross section B-B' of FIG.

Another embodiment of the present invention supports the spool 100 composed of the inner tube 110 and the outer tube 120, the jacket sleeve 200 that vacuums the junction 112 of the two spools 100, and the inner tube 110. It may be configured to include a support 300 that does.

As described above, the spool 100 may be composed of an inner tube 110 and an outer tube 120 of a certain length.

The inner tube 110 and the outer tube 120 may have a pipe shape, and the inner diameter of the outer tube 120 is larger than the outer diameter of the inner tube 110 so that the inner tube 110 is inserted into the outer tube 120. , is accepted.

And the length of the inner tube 110 is formed longer than the exterior 120, so that the inner tube 110 protrudes from both ends of the exterior 120 and is exposed.

On the other hand, the diaphragm portion 130A for blocking the cross section between the inner tube 110 and the outer tube 120 by contacting the inner circumference of both ends of the exterior 120 and the outer circumference of the inner tube 110, respectively, is a first diaphragm unit 131A , a second diaphragm portion 132A and a silicon material 133A.

That is, as shown in FIG. 8, the diaphragm portion 130A covering the cross section between the inner tube 110 and the outer tube 120 includes a first diaphragm portion 131A, a second diaphragm portion 132A, and a silicon material ( 133A).

The first diaphragm portion 131A is made of PEEK material, and has a donut shape or an annular half surface of a half surface sealing one end surface between the inner tube 110 and the outer tube 120, and half of the cross section ( 1/2) is occupied.

For reference, the first diaphragm portion 131A proposed by the present invention is characterized by being made of PEEK material having heat resistance, hydrolysis resistance, mechanical strength, flame retardancy, or electrical characteristics.

In more detail, as shown in FIGS. 8 to 10, the first diaphragm portion 131A has an end cap shape dividing a donut shape in half, and one side cross section between the inner tube 110 and the outer tube 120 The heat transfer from the exterior 120 to the inner tube 110 is minimized while maximizing the insulation effect and support function.

The second diaphragm portion 132A is made of PEEK material, and is a half donut that seals the other end surface between the inner tube 110 and the outer tube 120 in a symmetrical manner corresponding to the first diaphragm portion 131A. It occupies half (1/2) of the cross section in the shape of a half face or annular shape.

As shown in FIGS. 8 to 10, the second diaphragm portion 132A has an end cap shape in which a donut shape corresponding to the other end surface of the first diaphragm portion 131A is divided in half, and the inner tube 110 and the outer tube ( 120) to minimize heat transfer from the exterior 120 to the inner tube 110 while maximizing the insulation effect and the function of supporting.

As shown in FIG. 8 , the silicone material 133A is an insulating material having high elasticity and high adhesive strength, and is applied along the periphery of the first diaphragm portion 131A and the second diaphragm portion 132A to reliably seal the gap. let it

Accordingly, each of the diaphragm portions 130A may be in contact with each other to form an annular shape having a predetermined thickness.

Since the diaphragm part 130A has this structure, it prevents heat from the outer tube 120 exposed to the atmosphere from being rapidly transferred to the inner tube 110 .

In other words, since the diaphragm portion 130A is a non-conductor, transfer of heat to the inner tube 110 along the path of the diaphragm portion 130A can be minimized.

This is because, since cryogenic LNG is being transported to the inner tube 110, it is necessary to block even minute heat transfer as much as possible.

For reference, a plurality of the spools 100 are manufactured in a factory and transported to an installation site to perform piping work.

At this time, the spools 100 are butt welded to each other. That is, the exposed inner tubes of the spool 100 face each other and butt welding is performed to join the inner tubes to each other.

In addition, a part of the inner tube 110 may be formed as a bellows 111 to respond to expansion and contraction.

A vacuum port 121 is formed on the outer circumferential surface of the exterior 120 to extract air by connecting a vacuum device, and a powder charging port to inject and charge the powder insulation material 400 into the exterior 120. (122) is formed.

For reference, the vacuum pressure inside the exterior 120 is lowered to about 10 ^-3 Torr.

Next, the jacket sleeve 200 will be described.

The jacket sleeve 200 has a circular tubular configuration installed to surround the junction 112 where the spool 100 is joined to each other.

The jacket sleeve 200 has the same outer diameter as the exterior 120 .

In addition, one end of the jacket sleeve 200 is joined to an end of the exterior 120 of the spool 100 on one side by welding or the like, and the other end is bonded to the end of the exterior of the spool 100 on the other side.

In addition, a vacuum port 220 is also formed in the jacket sleeve 200 to form a vacuum therein, and a powder filling port 230 is formed to inject and charge the powder insulating material 400 therein.

Next, the support 300 will be described with reference to FIGS. 3 and 4 together. 3 is a perspective view showing the support of the present invention shown in FIG. 2, and FIG. 4 is a longitudinal cross-sectional view showing a pipe supported by the support of the present invention shown in FIG.

The support 300 is installed between the inner tube 110 and the outer tube 120 to support the inner tube 110, and includes a first support body 310, a second support body 320, and an assembly means 330. may consist of

First, the first support 310 may have a strap shape having a certain width, and is generally bent in a semicircular shape to support half of the inner tube 110. 312), the first elastic part 313, and the first pressing part 314 may be continuously connected.

As shown in the drawing, the first contact portion 311 has a structure in which a cross section is bent in a semicircular shape so as to be in close contact with and circumscribed to the outer circumferential surface of the inner tube 110 .

Both ends of the first contact portion 311 are bent at 180° toward the inner circumferential surface of the exterior 120 to form a first assembly portion 312 . Thus, the first assembly part 312 has a semicircular cross section.

In addition, each of the first assembly parts 312 formed at both ends of the first contact part 311 extends outward in a round arc shape to form a first elastic part 313 .

The first elastic part 313 has an elastic force to spread from both ends of the first contact part 311 .

In addition, the first pressing portion 314 extends from the first elastic portion 313 and makes surface contact or line contact with the inner circumferential surface of the exterior 120 .

Therefore, in a state in which the first pressing parts 314 are in contact with the inner circumferential surface of the exterior 120, the first elastic part 313 is opened by the elastic force to open the outer surface 120. ) is strongly pressed on the inner circumferential surface of the In addition, the first contact portion 311 may be more strongly adhered to the outer circumferential surface of the inner tube 110 by the elastic reaction force.

Next, the second support body 320 may have the same shape and structure as the first support body 310, and are installed symmetrically when facing each other with respect to the inner tube. That is, the first supporter 310 is installed to be in close contact with one half of the inner tube 110 and the second supporter 320 is installed to be in close contact with the other half of the inner tube 110 .

Specifically, the second support body 320 may be composed of a second contact portion 321, a second assembly portion 322, a second elastic portion 323, and a second pressing portion 324, respectively. Since it has the same shape and structure as the close contact part 311, the first assembly part 312, the first elastic part 313, and the first pressing part 314, a detailed description thereof will be omitted.

However, the first assembly part 312 and the second assembly part 322 are installed so as to come into contact with each other.

Therefore, the first assembly part 312 and the second assembly part 322 are fastened to each other by the assembly means 330 to be described later.

In the present invention, the first support body 310 and the second support body 320 are preferably made of CFRP (Carbon Fiber Reinforced Plastic) material.

In addition, it is preferable to coat the outer surfaces of the first support 310 and the second support 320 with GFRP (Glass Fiber Reinforced Plastic). Because, although CFRP is weaker than steel, it is an insulator, so the insulation effect is excellent by coating GFRP.

Meanwhile, it is preferable that antistatic insulators 315 and 325 having a predetermined thickness are further attached to the first pressing part 314 and the second pressing part 324 .

Since the first pressing part 314 and the second pressing part 324 continuously move while in contact with the inner circumferential surface of the exterior 120, friction constantly occurs. This presents a risk of abrasion and static electricity generation.

To this end, the insulators 315 and 325 are made of a GFRP material to minimize wear due to friction and to prevent generation of static electricity.

Next, the assembly means 330 is a configuration for assembling the first support body 310 and the second support body 320 by fastening the first assembly part 312 and the second assembly part 322 to each other. , It may be composed of a first fastening bar 331, a second fastening bar 332 and a tightening bolt 333.

The first fastening bar 331 and the second fastening bar 332 may each have a circular bar shape, and are seated on the first assembly part 312 and the second assembly part 322 .

In addition, the length of the first fastening bar 331 and the second fastening bar 332 may be formed to be the same as the widths of the first assembly part 312 and the second assembly part 322, but as shown Likewise, it is preferable that the width of the first assembly part 312 and the second assembly part 322 is formed longer so that the tightening bolt 333 can pass through.

The first fastening bar 331 and the second fastening bar 332 are arranged in parallel, and fastening bolts 333 pass through and fasten at both ends, thereby forming the first assembly part 312 and the second assembly part 322. Tighten up.

On the other hand, in order to quickly discharge the leaked gas in an emergency in which fuel leaks from the inner pipe 110 to prevent explosion and fire, air can generally be forced to flow between the outer pipe 120 and the inner pipe 110 .

At this time, in order to minimize air resistance, it is preferable that the first fastening bar 331 and the second fastening bar 332 form a semicircular cross section.

That is, the cross sections of the first fastening bar 331 and the second fastening bar 332 are the first curved part 331a and the second assembly part 331a respectively interviewed by the first assembly part 312 and the second assembly part 322. It may be composed of two curved portions 332a and a first flat portion 331b and a second flat portion 332b in contact with air.

The first curved portion 331a and the second curved portion 332a are formed to have the same or similar inner curvatures as the first assembly portion 312 and the second assembly portion 322, so that the first fastening bar 331 ) and the second fastening bar 332 are inserted into and seated in the first assembly part 312 and the second assembly part 322, respectively. That is, if there is no gap between the first flat part 331b and the first assembly part 312 or between the second flat part 332b and the second assembly part 322, the flow of air is not affected by the first flat part 331b. ) and the second flat portion 332b, the resistance is minimized.

In addition, the head of the tightening bolt 333 is buried in the first fastening bar 331 and the second fastening bar 332 so that it does not protrude from the first flat portion 331b and the second flat portion 332b. In this way, air resistance can be minimized. That is, the top surface of the head of the tightening bolt 333 and the first flat portion 331b and the second flat portion 332b are disposed on the same plane.

Preferably, as shown in Figure 4 (a), it is preferable that the support insulation 600 is further inserted between the inner tube 110, the first adhesion portion 311, and the second adhesion portion 321.

The support insulation 600 is to block the transfer of heat from the exterior 120 to the inner tube 110 through the support 300, and is made of a circular ring shape as shown in the first close contact. It may have the same width as that of the portion 311 and the second contact portion 321 .

In addition, it is preferable to use a special insulation material rather than a general insulation material for the support insulation material 600. For reference, when the heat transfer rate of steel is 1, the heat transfer rate of CFRP is approximately 1/5, but in the case of special insulation materials, it is as low as 1/400, so the insulation effect is very excellent.

Another embodiment of the present invention will be described with reference to FIG. 5 . 5 is a cross-sectional view showing a vacuum insulation pipe according to another embodiment of the present invention.

Another embodiment of the present invention is a structure provided with a powder insulation material 400 or a multi-layer insulation material 500 for insulation between the inner pipe 110 and the outer pipe 120.

First, as shown in FIG. 2 , a powdered insulating material 400 in a powder state may be filled between the inner tube 110 and the outer tube 120 and between the jacket sleeve 200 and the joint 112 .

The powdered insulating material 400 may use any one of powdered pearlite, diatomaceous earth, and aluminum.

In this case, it is possible by filling the inside of the exterior 120 and the jacket sleeve 200 through the powder charging ports 122 and 230 and performing vacuum work using the vacuum ports 121 and 220 . At this time, a vacuum pressure of about 10 ⁻³ Torr can be maintained.

Therefore, in addition to thermal insulation by vacuum, since the thermal insulation function of the powder thermal insulation material 400 can be obtained, the thermal insulation effect is improved.

Alternatively, as shown in FIG. 5, it may be a structure in which the multi-layer insulation 500 is wrapped around the outer circumferential surface of the inner tube 110 as a whole.

The multi-layered insulation 500 may use an alternately laminated aluminum foil and glass wool.

Also, by vacuuming the exterior 120 and the inside of the jacket sleeve 200, the effect can be maximized by vacuum insulation and double insulation by the multi-layer insulation 500.

In addition, when using the multi-layer insulation 500, the support insulation 600, as shown in Figure 4 (b), the multi-layer insulation 500 and the first adhesion portion 311 and the second adhesion portion ( 321) can be inserted between them.

Next, another embodiment of the present invention will be described with reference to FIGS. 6 and 7 .

Another embodiment of the present invention may largely include the spool 100, the jacket sleeve 200, and the support 300.

Since the spool 100 and the support 300 are substantially the same as those described above, a detailed description thereof will be omitted, and only the jacket sleeve with a difference will be described in detail.

The inner diameter of the jacket sleeve 200 is larger than the outer diameter of the outer diameter 120 so that the outer diameter 120 is drawn into and accommodated inside.

At this time, in order to seal the jacket sleeve 200 , the sleeve ring 210 may be coupled between the outer circumferential surface of the exterior 120 and both ends of the jacket sleeve 200 .

The sleeve ring 210 has a ring or washer shape, and when assembling the jacket sleeve 200 in the field, the sleeve ring 210 can be combined by welding in an inserted state. That is, the outer circumference of the sleeve ring 210 is coupled to the inner circumferential surface of the jacket sleeve 200, and the inner circumference of the sleeve ring 210 is coupled to the outer circumferential surface of the exterior 120.

Importantly, it is preferable that the position of the sleeve ring 210 be positioned on the coupling part 130, that is, between the large-diameter ring 131 and the small-diameter ring 132.

Therefore, after welding the sleeve ring 210 to the coupling part 130 first, the jacket sleeve 200 and the sleeve ring 210 are welded together.

Similar to the above description, since the jacket sleeve 200 is also exposed to the air, the heat of the jacket sleeve 200 can be transferred to the inner tube through the exterior 120 and the coupling portion 130, and thus the coupling portion 130 ) is preferably located on the coupling part 130 so that heat transfer is delayed.

Representative embodiments of the present invention have been described above with reference to the drawings, but those skilled in the art will be able to make various applications and modifications within the scope of the present invention based on the above information. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, but should be defined by not only the claims to be described later, but also those equivalent to these claims.

100: spool
110: inner tube 111: bellows
112: junction 120: exterior
121: vacuum port 122: powder charging port
130: coupling part 131: large-diameter ring
132: small diameter ring 133: connector
130A: diaphragm part 131A: first diaphragm part
132A: 2nd diaphragm part 133A: silicon material
200: jacket sleeve 210: sleeve ring
220: vacuum port 230: powder charging port
300: support
310: first support 311: first contact part
312: first assembly part 313: first elastic part
314: first pressing part 315: insulator
320: second support 321: second contact part
322: second assembly part 323: second elastic part
324: second pressing part 325: insulator
330: assembly means 331: first fastening bar
331a: first curved portion 331b: first flat portion
332: second fastening bar 332a: second curved portion
332b: second flat part 333: tightening bolt
400: powder insulation
500: multi-layer insulation
600: support insulation

Claims (8)

A spool consisting of an inner tube for transporting cryogenic LNG and an exterior in which a vacuum is formed inside while surrounding the inner tube, and both ends are combined with the exterior of both sides while surrounding a junction where the spool is joined to each other, and a vacuum is formed in the interior In the vacuum insulation double pipe comprising a jacket sleeve and a support provided between the inner tube and the outer tube to support the inner tube,
Coupling parts for coupling both ends of the exterior to the outer circumferential surface of the inner tube,
A ring-shaped large-diameter ring coupled to the inner circumference of both ends of the exterior;
A ring-shaped small-diameter ring coupled to the outer circumference of the inner tube;
It is inserted between the exterior and the inner tube and has a circular tube-shaped connecting tube connecting the large-diameter ring and the small-diameter ring;
The support is
A first contact part having a semicircular shape and in close contact with the outer circumferential surface of the inner tube, a first assembly part bent from both ends of the first contact part, and a first elastic part extending inwardly from the first assembly part, respectively; A strip-shaped first support member extending from the first elastic portion and comprising a first pressing portion contacting the inner circumferential surface of the exterior;
A second contact portion having a semicircular shape and in close contact with the outer circumferential surface of the inner tube, a second assembly portion bent from both ends of the second contact portion and facing the first assembly portion, and extending inwardly from the second assembly portion, respectively. a band-shaped second support member comprising a second elastic part and a second pressing part extending from the second elastic part and contacting the inner circumferential surface of the outer shell; and
A first fastening bar seated in the first assembly part and a second fastening bar seated in the second assembly part are fastened while penetrating both ends of the first fastening bar and the second fastening bar, thereby engaging the first fastening bar and the second fastening bar. A vacuum insulation pipe comprising: a tightening bolt for applying a clamping force to a bar, and assembly means for coupling the first assembly part and the second assembly part to each other. According to claim 1,
A ring-shaped sleeve ring is coupled and sealed between the outer circumferential surface of the exterior and the end of the jacket sleeve, wherein the sleeve ring is positioned between the large-diameter ring and the small-diameter ring. A spool consisting of an inner tube for transporting cryogenic LNG and an exterior in which a vacuum is formed inside while surrounding the inner tube, and both ends are combined with the exterior of both sides while surrounding a junction where the spool is joined to each other, and a vacuum is formed in the interior In the vacuum insulation double pipe comprising a jacket sleeve and a support provided between the inner tube and the outer tube to support the inner tube,
The diaphragm portion covering the cross section between the inner tube and the outer tube,
A first diaphragm portion of an annular half surface for sealing one end surface between the inner tube and the outer tube; and a second diaphragm portion of an annular half surface sealing the other end surface between the inner tube and the outer tube symmetrically corresponding to the first diaphragm portion. And an insulating silicon material applied along the circumferences of the first diaphragm portion and the second diaphragm portion; to form a diaphragm,
The support is
A first contact part having a semicircular shape and in close contact with the outer circumferential surface of the inner tube, a first assembly part bent from both ends of the first contact part, and a first elastic part extending inwardly from the first assembly part, respectively; A strip-shaped first support member extending from the first elastic portion and comprising a first pressing portion contacting the inner circumferential surface of the exterior;
A second contact portion having a semicircular shape and in close contact with the outer circumferential surface of the inner tube, a second assembly portion bent from both ends of the second contact portion and facing the first assembly portion, and extending inwardly from the second assembly portion, respectively. a band-shaped second support member comprising a second elastic part and a second pressing part extending from the second elastic part and contacting the inner circumferential surface of the outer shell; and
A first fastening bar seated in the first assembly part and a second fastening bar seated in the second assembly part are fastened while penetrating both ends of the first fastening bar and the second fastening bar, thereby engaging the first fastening bar and the second fastening bar. A vacuum insulation pipe comprising: a tightening bolt for applying a clamping force to a bar, and assembly means for coupling the first assembly part and the second assembly part to each other. According to claim 1 or 3,
A powdered insulating material is filled between the inner tube and the outer tube and between the jacket sleeve and the joint,
The powder insulation material is a vacuum insulation pipe, characterized in that any one of pearlite, diatomaceous earth, aluminum powder. According to claim 1 or 3,
The outer circumferential surface of the inner tube is surrounded by a multilayer insulation material in which aluminum foil and glass wool are alternately laminated. According to claim 1 or 3,
In order to reduce the resistance of the air flowing between the exterior and the inner tube, the first fastening bar and the second fastening bar are respectively a first curved surface and a second curved surface facing the first assembly part and the second assembly part, A vacuum insulation pipe, characterized in that the cross section is a semicircular shape consisting of a first flat portion and a second flat portion facing the exterior. According to claim 6,
The first support and the second support are made of CFRP (Carbon Fiber Reinforced Plastic) material, and the outer surfaces of the first support and the second support are coated with GFRP (Glass Fiber Reinforced Plastic) Vacuum insulation pipe, characterized in that. According to claim 1 or 2,
A vacuum insulation pipe, characterized in that a circular ring-shaped support insulation is inserted between the inner tube and the first and second adhesion portions.

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