Inner pipe support unit for double pipe

Abstract

The present invention provides an inner pipe support unit having a brace of a leaf spring structure for supporting an inner pipe disposed in an inner space of an outer pipe constituting a double pipe that may be provided in a gas transfer system or the like of a ship using LNG, LPG, or the like as fuel gas. The inner pipe support unit for a double pipe according to the present invention, as described above, provides: 1) a structure in which a pair of braces surrounding the inner pipe are connected by direct wide-area surface contact in a predetermined area range; 2) a structure in which the pair of braces are fastened to each other by bolts and nuts coupled to each other outside the braces through fastening holes formed only on both ends of fastening guides having a width greater than that of the braces; and 3) a structure in which the pair of braces surround the inner pipe with a pair of bushings disposed therein. Accordingly, structural stability and material mechanical stability are maximized, deformation / cracking / twisting / fatigue failures are minimized / suppressed by high durability, and manufacturing / assembly / installation works are facilitated.

Description

Inner pipe support unit for double piping

[0001] The present invention relates to an inner pipe support unit having a leaf spring structure brace that supports an inner pipe placed in the inner space of an outer casing constituting a double pipe that can be equipped in a gas transfer system of a ship using LNG, LPG, etc. as fuel gas. More specifically, the invention relates to an inner pipe support unit for a double pipe that maximizes structural stability and material mechanical stability, minimizes or suppresses deformation, cracking, twisting, or fatigue failure with high durability, and improves ease of manufacturing, assembly, and installation work by providing: 1) a structure in which a pair of braces surrounding an inner pipe are connected by direct wide-area surface contact within a certain area; 2) a structure in which a pair of braces are connected by a bolt-nut that is joined to each other from the outside of the brace through fastening holes formed only at both ends of a fastening guide with a width greater than that of the brace; and 3) a structure in which a pair of braces surrounds an inner pipe while a pair of bushings are placed inside.

[0002]

[0003] Generally, ships using fuel gases such as LNG or LPG are installed with a double-pipe system consisting of an outer pipe and an inner pipe to supply fuel gas from the storage tank to the engine or from the storage tank to the boiler. In the case of such a double-pipe system, where a pipe-shaped inner pipe is housed inside a pipe-shaped outer pipe, a structure capable of supporting the inner pipe in the space between the outer and inner pipes prevents the inner pipe from moving or colliding with the outer pipe.

[0004]

[0005] Technologies related to this include Korean Registered Patent Publication No. 10-2198220 "Inner pipe support unit for gas transfer pipes," No. 10-2644893 "Support for double piping," and No. 10-2604436 "Support for double piping," which have been developed and are in use.

[0006]

[0007] In the case of conventional inner pipe support units, including the aforementioned registration number 10-2604436 "Support for double pipes," as shown in FIG. 5, the structure is generally such that the braces (100) are joined to each other by a fastening bolt (300) passing through a fastening hole formed in the brace (100) while in line contact with each other. However, such a line contact structure / fastening hole formation structure of the brace has limitations in 1) effectively absorbing load and securing structural stability. In addition, 2) as force is concentrated at the line contact area, the risk of deformation / damage / breakage due to stress concentration increases, and fatigue life becomes poor. In particular, 3) as the fastening hole is formed in the brace (100) itself, deformation and cracking of the brace occur during use, and the risk of fatigue failure also increases.

[0008]

[0009] And when twisting occurs due to thermal shrinkage / expansion of the inner tube (P1), the line contact structure of the structurally unstable brace (100) causes 1) irregular deformation or twisting of the brace (100), so the performance of the inner tube support unit is not guaranteed, 2) the direction of displacement caused by thermal deformation of the inner tube (P1) and the direction of reaction force of the plate spring structure do not match, so the straightness of the inner tube (P1) decreases, and 3) the brace (100), which has become loose due to repeated thermal deformation of the inner tube (P1), slides away from the inner tube (P1) which is vertically arranged, and there is a high risk that the inner tube support unit will detach from the inner tube (P1).

[0010]

[0011] In addition, in the case of a conventional inner pipe support unit such as the "double pipe support" of Fig. 5, structural design and assembly work are essential to strictly maintain a constant spacing between braces (100) at the line contact area, and accordingly, the assembly work time becomes longer.

[0012]

[0013] Meanwhile, conventional inner tube support units use a brace (10) made of SUS301 material with high magnetic properties, which causes problems such as iron powder, dust, and other foreign substances adhering during storage / installation.

[0014]

[0015] Accordingly, the present invention aims to provide a new type of inner pipe support unit for double piping that improves upon the problems of such conventional technology by supporting the inner pipe with a pair of braces having a shape structure that effectively absorbs load without stress concentration, and thereby enabling structural stability, high durability, and stable performance under repeated loading conditions.

[0016]

[0017] Furthermore, the present invention aims to provide a new type of inner pipe support unit for a double pipe, wherein a pair of braces surrounding the inner pipe are connected by direct wide-area surface contact within a certain area, thereby preventing stress concentration caused by vibration or movement due to external forces on the inner / outer pipes constituting the double pipe, or by the internal load of the inner / outer pipes themselves, inducing uniform load distribution, and enabling an extension of fatigue life through improved overall structural rigidity.

[0018]

[0019] In addition, the present invention aims to provide a new type of inner pipe support unit for double piping in which fastening holes are formed only at both ends in the width direction of a fastening guide that is wider than the brace, and the surface contact portions between a pair of braces are tightly joined by the tightening force of a fastening bolt and a fastening nut that are joined to each other from the outside of the brace through the fastening holes, thereby eliminating the fastening holes that were conventionally formed in the brace itself, so that structural weakness is reduced and the risk of fatigue failure is minimized, while durability is increased and the possibility of deformation or cracking occurs even when the brace is used for a long period of time is lowered.

[0020]

[0021] Furthermore, the present invention aims to provide a new type of inner pipe support unit for double piping that facilitates fastening, reduces assembly time, and improves work efficiency by providing a fastening guide structure in which a fastening bolt and a fastening nut are coupled to a pair of fastening pieces arranged vertically.

[0022]

[0023] Furthermore, the present invention aims to provide a new type of inner pipe support unit for double piping in which deformation or twisting of the components of the inner pipe support unit is minimized and structural stability is enhanced by providing a structure in which a surface-contacting brace and a fastening guide are joined by surface contact on both the upper and lower sides, and long-term performance is guaranteed while maintaining a stable structural-functional shape even against twisting caused by thermal shrinkage / expansion of the inner pipe.

[0024]

[0025] The present invention aims to provide a new type of inner tube support unit for double piping that minimizes the phenomenon of unnecessary elastic force being generated in multiple directions by designing a shape structure in which a pair of braces surrounding the inner tube are connected by direct wide-area surface contact within a certain area, thereby aligning the direction of displacement caused by thermal deformation of the inner tube with the direction of reaction force generated by the brace of the plate spring structure, and thereby increasing the straightness of the inner tube.

[0026]

[0027] Furthermore, the present invention aims to provide a new type of inner pipe support unit for double piping that, unlike the braces of conventional inner pipe support units that make line contact, has a surface contact structure, thereby eliminating the need for structural design and assembly work to strictly maintain a constant spacing between braces in the line contact area, and thereby enabling a reduction in assembly time.

[0028]

[0029] The present invention aims to provide a new type of inner tube support unit for double piping that 1) offers structural design advantages as described above and 2) provides a structure in which a pair of braces surrounds an inner tube while a pair of bushings are positioned on the inside, thereby preventing the connection from becoming loose even with repeated thermal deformation of the inner tube, and thereby preventing the braces from sliding away from the inner tube while being vertically positioned.

[0030]

[0031] In addition, the present invention aims to provide a new type of inner pipe support unit for double piping that prevents the adhesion of iron powder, dust, and other foreign substances during storage, installation, and use by using a brace made of SUS304 material with low magnetism, unlike the prior art which used a brace made of SUS301 material with high magnetism.

[0032]

[0033] According to the features of the present invention for achieving the above-described purpose, the present invention relates to an inner tube support unit for supporting an inner tube (20) disposed in the inner space of an outer tube (10) constituting a double pipe (1), comprising: an inner tube-side semicircular body (110) that surrounds one side and the other side of the outer surface of the inner tube (20), respectively, and is connected to the inner tube (20); and an outer tube-side curved body (130) that surrounds a part and the other side of the inner surface of the outer tube (10), respectively, and is connected to the outer tube (10), and the entire portion including the inner tube-side semicircular body (110) and the outer tube-side curved body (130) is formed as a continuous single flat body, and a pair of braces (100); The present invention provides an inner pipe support unit for a double pipe, characterized by comprising: a pair of fastening guides (200) that each bring a pair of braces (100) into surface contact at both sides of the space area between the inner pipe (20) and the outer pipe (10), and tightly connect the surface-contacted portions of the braces (100).

[0034]

[0035] In the inner pipe support unit for a double pipe according to the present invention, the brace (100) comprises: an inner pipe-side semicircular body (110) formed in a semicircular shape that surrounds the outer surface of the inner pipe (20); a first contact surface body (120a) formed by extending in a straight line from one end portion of the inner pipe-side semicircular body (110); a second contact surface body (120b) formed by extending in a bent direction toward the inner pipe-side semicircular body (110) from the end portion of the first contact surface body (120a); and a third contact surface body (120c) formed by extending in a straight line from the other end portion of the inner pipe-side semicircular body (110). The configuration may include an outer surface curved body (130) that is extended and bent in the opposite direction of the inner surface semicircular body (110) from the end portion of the third contact surface body (120c) and is formed with a curved shape corresponding to the inner circumference of the outer surface (10).

[0036]

[0037] In the inner pipe support unit for a double pipe according to the present invention, the fastening guide (200) is composed of a pair of fastening pieces (210) that are arranged vertically and joined together, having a width (W) greater than the width (w) of the brace (100).

[0038] A pair of the above-mentioned braces (100) are inserted through the space between a pair of upper and lower-arranged fastening pieces (210) to make surface contact, and the pair of fastening pieces (210) are joined to each other at a spaced-out portion outside the widthwise end portions of the brace (100), so that the brace (100) itself does not require a separate processing portion for surface contact connection.

[0039]

[0040] The inner pipe support unit for a double pipe according to the present invention may include a fastening bolt (300a) that passes through a fastening hole formed at both ends in the width direction of the fastening piece (210), and a fastening bolt (300a) that is coupled to the end portion of the fastening bolt (300a), and a fastening member (300) that combines a pair of the fastening pieces (210) according to a tightening operation between the fastening bolt (300a) and the fastening bolt (300a).

[0041]

[0042] The inner pipe support unit for a double pipe according to the present invention may include a pair of bushings (400) that are arranged between a pair of braces (100) and an inner pipe (20) and are formed in a semicircular shape that surrounds the outer surface of the inner pipe (20).

[0043]

[0044] According to the inner pipe support unit for double piping of the present invention, structural stability and material mechanical stability are maximized, and deformation, cracking, twisting, fatigue failure, etc. are minimized or suppressed due to high durability.

[0045]

[0046] FIG. 1 is a front view of an inner pipe support unit for a double pipe according to an embodiment of the present invention;

[0047] FIG. 2 is a drawing for showing the shape structure and coupling structure of a brace according to an embodiment of the present invention;

[0048] FIG. 3(a) and (b) are perspective views of an inner pipe support unit for a double pipe according to an embodiment of the present invention;

[0049] FIG. 4 is a drawing for showing a brace surface contact coupling structure by a fastening guide constituting an inner pipe support unit for a double pipe according to an embodiment of the present invention;

[0050] FIG. 5 is an example diagram of the configuration of Korean Registered Patent Publication No. 10-2604436.

[0051]

[0052] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. Meanwhile, in the drawings and detailed description, the illustration and mention of configurations and operations that are easily understood by those skilled in the art have been simplified or omitted. In particular, in the drawings and detailed description, detailed descriptions and illustrations of specific technical configurations and operations of elements not directly related to the technical features of the present invention have been omitted, and only the technical configurations related to the present invention have been briefly illustrated or described.

[0053]

[0054] The present invention relates to an inner pipe support unit having a leaf spring structure brace (100) that supports an inner pipe (20) disposed in the inner space of an outer pipe (10) that forms a double pipe that can be provided in a gas transfer system of a ship that uses LNG, LPG, etc. as fuel gas. The inner pipe support unit for a double pipe according to an embodiment of the present invention is composed of a configuration including a pair of braces (100), a pair of fastening guides (200), a fastening member (300), a pair of bushings (400), and a pair of sliding bearings (500), as shown in FIGS. 1 and FIGS. 3.

[0055]

[0056] A pair of braces (100) are connected to the inner tube (20) by having 1) an inner tube-side semicircular body (110) that surrounds one side and the other side of the outer surface of the inner tube (20), respectively, and 2) an outer tube-side curved body (130) that surrounds a part of the inner surface and the other side of the outer tube (10), respectively, and the entire portion including the inner tube-side semicircular body (110) and the outer tube-side curved body (130) is formed as a leaf spring structure consisting of a continuous single facet. As it has a shape structure that effectively absorbs load without stress concentration, it is possible to maintain structural stability, high durability, and stable performance under repeated load conditions of the inner tube support unit.

[0057] The brace (100) according to an embodiment of the present invention is made of SUS304 material with low magnetism, so that iron powder, dust, and other foreign substances do not adhere to it during storage / installation / use.

[0058]

[0059] Here, the brace (100) according to an embodiment of the present invention is composed of an inner semicircular body (110), a first contact surface body (120a), a second contact surface body (120b), a third contact surface body (120c), and an outer curved surface body (130) as shown in FIG. 2.

[0060] The inner viewing semicircular body (110) is a portion formed in a semicircular shape that surrounds the outer surface of the inner tube (20). Such an inner viewing semicircular body (110) can be formed to have an inner radius that is the size of the outer radius of the inner tube (20) plus the thickness of the bushing (400).

[0061] The first contact surface (120a) is a portion formed by extending in a straight line from one end portion of the internally observed semicircular body (110). Such a first contact surface (120a) can be formed by extending in a normal direction from one end portion of the internally observed semicircular body (110).

[0062] The second contact surface (120b) is a portion that is extended and bent from the end portion of the first contact surface (120a) toward the inner semicircular body (110). The end portion of the inner semicircular body (110), the first contact surface (120a), and the second contact surface (120b) can form a "∪" shape as shown in FIG. 2.

[0063] The third contact surface (120c) is a portion formed by extending in a straight line from the other end portion of the internally observed semicircular body (110). Such a third contact surface (120c) can be formed by extending in a normal direction from the other end portion of the internally observed semicircular body (110).

[0064] The outer curved body (130) is formed by extending from the end portion of the third contact surface (120c) in a direction opposite to the inner semicircular body (110) and is a portion formed in a curved shape corresponding to the inner circumference of the outer surface (10). Such an outer curved body (130) can be formed to have a radius of the inner radius of the outer surface (10) minus the thickness of the sliding bearing (500).

[0065]

[0066] A pair of braces (100) configured as described above are joined facing each other, and 1) a pair of internal semicircular bodies (110) are joined together to form a circular line.

[0067] In particular, 1) the first contact surface body (120a) of one side brace (100) facing each other and the third contact surface body (120c) of the other side brace (100), and the third contact surface body (120c) of one side brace (100) and the first contact surface body (120a) of the other side brace (100) are in close contact and joined together, and 2) the second contact surface body (120b) of one side brace (100) facing each other and the outer surface curved body (130) of the other side brace (100), and the second contact surface body (120b) of the other side brace (100) and the outer surface curved body (130) of one side brace (100) are also in close contact and joined together.

[0068] In this way, since a pair of braces (100) surrounding the inner tube (20) are connected by direct wide-area surface contact within a certain area, vibration or movement caused by external forces on the inner tube (20) and outer tube (10) constituting the double pipe (1), or stress concentration caused by the self-weight of the inner tube (20) or outer tube (10), is prevented, uniform load distribution is induced, and an extension of fatigue life can be expected due to the improvement of overall structural rigidity. Furthermore, the shape structure design of the brace (100) as described above aligns the direction of displacement caused by thermal deformation of the inner tube (20) with the direction of reaction force generated by the plate spring structure brace, thereby minimizing the phenomenon of unnecessary elastic force being generated in multiple directions, and thereby increasing the straightness of the inner tube (20). In addition, unlike the braces of conventional inner tube support units that make line contact, the surface contact structure eliminates the need for structural design and assembly work to strictly maintain a constant spacing between braces in the line contact area, thereby allowing for a reduction in assembly time.

[0069]

[0070] A pair of fastening guides (200) each make surface contact with a pair of braces (100) at both sides of the space area between the inner tube (20) and the outer tube (10), and tightly join the surface-contacted portions of the braces (100). Here, the fastening guide (200) according to an embodiment of the present invention is composed of a pair of fastening pieces (210) that are arranged vertically and joined to each other, having a width (W) greater than the width (w) of the brace (100) as shown in FIG. 4. The pair of braces (100) make surface contact by penetrating and being inserted between the pair of fastening pieces (210) arranged vertically. To this end, the fastening piece (210) of the fastening guide (200) according to an embodiment of the present invention forms a fitting groove (211) through which the brace (100) passes and is inserted, as shown in FIG. 4.

[0071] Meanwhile, a pair of fastening pieces (210) are joined to each other at a portion spaced apart from the outer side of both ends in the width direction of the brace (100), so that the brace (100) itself does not require a separate processing portion for surface contact joining. The fastening pieces (210) according to the embodiment of the present invention form fastening holes at both ends in the width direction, and a pair of fastening pieces (210) are joined to each other through a fastening member (300) placed in the fastening hole.

[0072]

[0073] The fastening member (300) is composed of a fastening bolt (300a) that passes through a fastening hole formed at both ends of the fastening piece (210) in the width direction, and a fastening bolt (300a) that is coupled to the end portion of the fastening bolt (300a), and a pair of fastening pieces (210) are coupled according to the tightening operation between the fastening bolt (300a) and the fastening bolt (300a).

[0074]

[0075] As described above, fastening holes are formed only at both ends of the width direction of the fastening guide (200), which is wider than the brace (100), and a structure is provided in which the surface contact portions between a pair of braces (100) are closely joined by the tightening force of the fastening bolt (300a) and fastening nut (300b) that are joined to each other from the outside of the brace (100) through the fastening holes, thereby eliminating the fastening holes that were previously formed in the brace itself, so that structural weakness is reduced and the risk of fatigue failure is minimized, while durability is increased and the possibility of deformation or cracking occurring is lowered even when the brace (100) is used for a long period of time.

[0076] In addition, a structure is provided in which a fastening bolt (300a) and a fastening nut (300b) are coupled to a pair of upper and lower fastening pieces (210), thereby facilitating the fastening process, shortening assembly time, and improving work efficiency. Furthermore, a structure is provided in which a surface-contacting brace (100) and a fastening guide (200) are coupled by making surface contact on both the upper and lower sides, thereby minimizing deformation or twisting of the components of the inner tube support unit, increasing structural stability, and ensuring long-term performance while maintaining a stable structural and functional shape even against twisting caused by thermal shrinkage / expansion of the inner tube.

[0077]

[0078] A pair of bushings (400) are positioned between a pair of braces (100) and an inner tube (20), and are formed in a semicircular shape that surrounds the outer surface of the inner tube (20). The bushings (400) may be formed in an arc shape closer to a semicircle with a shorter circumference than a semicircle, taking into account volume expansion due to thermal deformation.

[0079] By providing a structure in which a pair of braces (100) surround an inner tube (20) with a pair of bushings (400) positioned on the inside, the phenomenon of the connection becoming loose even with repeated thermal deformation of the inner tube (20) is prevented, and thereby, the phenomenon of the braces (100) sliding away from the inner tube (20) which is vertically positioned above and below is prevented.

[0080]

[0081] A pair of sliding bearings (500) are positioned between the brace (100) and the outer surface (10), and consist of a base (520) that contacts the inner surface of the outer surface (10), side covers (530) that protrude on both sides in the width direction of the base (520), and a fixing bolt (510) that protrudes from the surface of the base (520). A curved body (130) on the outer surface of the brace (100), through which the fixing bolt (510) passes, is formed as shown in FIG. 4, and is fixed to the sliding bearing (500) by a brace fixing bolt (600).

[0082]

[0083] Through the inner pipe support unit for double piping according to the embodiment of the present invention configured as described above, structural stability and material mechanical stability can be maximized, deformation, cracking, twisting, and fatigue failure can be minimized or suppressed due to high durability, and ease of manufacturing, assembly, and installation work can also be improved.

[0084]

[0085] Although an inner pipe support unit for a double pipe according to an embodiment of the present invention as described above has been illustrated in accordance with the description and drawings above, this is merely for illustrative purposes, and those skilled in the art will understand that various changes and modifications are possible within the scope of the technical concept of the present invention.

[0086]

[0087] According to the inner pipe support unit for double piping of the present invention, ease of manufacturing / assembly / installation work can be improved.

Claims

1. An inner pipe support unit for supporting an inner pipe (20) disposed in the inner space of an outer pipe (10) constituting a double pipe (1), A pair of braces (100) having a plate spring structure in which the entire portion including the inner-side semicircular body (110) and the outer-side curved body (130) is connected to the inner tube (20) by having an inner-side semicircular body (110) that surrounds one side and the other side of the outer surface of the inner tube (20), and the outer-side curved body (130) that surrounds a part and the other side of the inner surface of the outer tube (10), respectively, is formed as a continuous single flat body; A double-pipe inner tube support unit characterized by including: a pair of fastening guides (200) that each bring a pair of braces (100) into surface contact at both sides of the space area between the inner tube (20) and the outer tube (10), and tightly connect the surface-contacted portions of the braces (100).

2. In Paragraph 1, The above brace (100) is, An inner tube-side semicircular body (110) formed in a semicircular shape that surrounds the outer surface of the inner tube (20); A first contact surface (120a) formed by extending in a straight line from one end portion of the above-mentioned internal semicircular body (110); A second contact surface (120b) that is extended and bent from the end portion of the first contact surface (120a) toward the inner semicircular surface (110); A third contact surface (120c) formed by extending in a straight line from the other end portion of the above-mentioned internal semicircular body (110); An inner pipe support unit for a double pipe, characterized by comprising: an outer side curved body (130) that is formed by extending from the end portion of the third contact surface body (120c) in a direction opposite to the inner pipe side semicircular body (110) and having a curved shape corresponding to the inner circumference of the outer surface (10).

3. In Paragraph 1, The above-mentioned fastening guide (200) is composed of a pair of fastening pieces (210) that are arranged vertically and joined together, having a width (W) greater than the width (w) of the brace (100). A pair of the above braces (100) are inserted through the space between a pair of upper and lower fastening pieces (210) and come into surface contact. The above pair of fastening pieces (210) are joined to each other at a portion spaced apart from the outer side of the widthwise end portions of the brace (100), so that the brace (100) itself does not require a separate processing portion for surface contact joining, thereby forming an inner pipe support unit for a double pipe.

4. In Paragraph 3, A double-pipe inner pipe support unit characterized by comprising: a fastening bolt (300a) passing through a fastening hole formed at both ends in the width direction of the fastening piece (210), and a fastening bolt (300a) coupled to the end portion of the fastening bolt (300a), and a fastening member (300) that combines a pair of the fastening pieces (210) according to a tightening operation between the fastening bolt (300a) and the fastening bolt (300a).

5. In Paragraph 1, A double pipe inner tube support unit characterized by including a pair of bushings (400) that are positioned between a pair of braces (100) and an inner tube (20) and are formed in a semicircular shape that surrounds the outer surface of the inner tube (20).

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