JP2007046714A - Shading device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce generation of BOG (Boil Off Gas) in a container for LNG (Liquefied Natural Gas). <P>SOLUTION: This shading device disposed outside of a frame body for shading the container for liquefied natural gas, having a tank receiving the liquefied natural gas, and the frame body surrounding the tank to protect the tank, can take both of a state of covering the container for liquefied natural gas, and the other state of not covering the container for liquefied natural gas. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light shielding device.

  Liquid natural gas (hereinafter abbreviated as LNG) is a combustible natural gas mainly composed of methane gas generated from the ground, after removing impurities such as moisture, sulfur compounds, and carbon dioxide. It is cooled to 162 ° C. and liquefied. When natural gas is liquefied, its volume is about 1/600 that of gas, so it is generally used as LNG when transported or stored.

  The LNG is transported from the shipping base to a shipping base at a port, for example, via a tanker. The LNG transported to the shipping base is refined at the manufacturing base of the shipping base, and is transported by a tank truck to a satellite base that supplies gas to consumers and production facilities. Since LNG is an ultra-low temperature of −162 ° C., a vehicle having a heat insulating structure in the tank portion is used as the tank lorry vehicle.

  At the satellite base, LNG is transferred from a tank truck to a storage tank. The LNG stored in the storage tank is gasified by the vaporizer and supplied to each consumer, production facility, and the like.

  However, there is a problem that it takes time and labor to transfer the LNG from the tank truck to the storage tank.

  Therefore, in Patent Document 1, when transporting LNG from a shipping base to a satellite base, a trailer type vehicle in which a towing vehicle and a freight vehicle towed by the towing vehicle are connected and used is used instead of a tank truck. Technology has been proposed. A cargo vehicle (hereinafter referred to as a trailer) is provided with a tank having a heat insulating structure similar to that of a tank truck. Further, Patent Document 1 also proposes a technique for handling the frame and the tank as an LNG container by providing a frame that surrounds the tank portion of the trailer.

In this way, when the LNG transporting vehicle is a trailer type, when transporting LNG from the shipping base, the trailer is connected to the towing vehicle and travels. When the vehicle arrives at the satellite base, the trailer is moved to the towing vehicle. And can be used as a storage tank for LNG.
JP 2005-133735 A

  A trailer LNG container temporarily installed as a LNG storage tank at a satellite base is always BOG (Boil Off) due to, for example, direct sunlight or heat input from the outside air, even if the tank portion has a heat insulating structure. Gass) is generated.

  In particular, for example, when LNG supply facilities at a satellite base are stopped and LNG is not supplied to consumers, production facilities, etc., the amount of BOG generated increases. As described above, since the volume of LNG is 600 times that of the liquid when vaporized, the pressure in the tank increases as the amount of BOG generated increases. For this reason, the generated BOG had to be released from the tank, resulting in an economic loss.

  This invention is made | formed in view of this subject, The place made into the objective is to provide the light-shielding apparatus which can reduce the generation amount of BOG in the container for LNG than before.

  The invention for solving the above-described problems is directed to light shielding a liquefied natural gas container having a tank containing liquefied natural gas and a frame surrounding the tank to protect the tank. A light-shielding device provided on the outside, wherein the light-shielding device can take both a state of covering the liquefied natural gas container and a state of not covering the liquefied natural gas container.

  Further, in such a light shielding device, a pair of light shielding covers made of cloth or vinyl resin, and a pair of bars respectively coupled to one side of the pair of light shielding covers so as to allow the pair of light shielding covers to be pulled out and wound up A member and a base provided in a longitudinal direction of the liquefied natural gas container in the upper part of the frame body and rotatably supporting the pair of rod members, and the pair of light shielding covers includes the pair of light shielding covers. It may be made to cover the circumference | surroundings of both of the said containers for liquefied natural gas bordering on the said base by being pulled out from the state wound up by the rod member.

  In the light shielding device, it is preferable that the pair of light shielding covers be selectively pulled out.

  Moreover, in this light-shielding device, it is preferable that the base is movable in the longitudinal direction of the liquefied natural gas container.

  Further, in the light shielding device, a first light shielding surface disposed on an upper portion of the frame body, and a second light shielding surface disposed on one side portion of the frame body along a longitudinal direction of the liquefied natural gas container. A third light shielding surface disposed on the other side of the frame along the longitudinal direction of the liquefied natural gas container, and the second and third light shielding surfaces The first light shielding surface may be foldable.

  In the light shielding device, the light shielding cover further integrates a fourth light shielding surface disposed on one side of the frame that intersects the longitudinal direction of the liquefied natural gas container. The fourth light shielding surface is preferably foldable on top of the first light shielding surface.

  Moreover, it is preferable that the light shielding device further includes a spacer that provides a gap between the first light shielding surface and the upper portion of the frame.

  In the light shielding device, the first light shielding surface is a wooden plate or a metal plate having a gap between the second light shielding surface and the outer surface of the frame body to which the third light shielding surface is opposed. Is preferred.

  In the light shielding device, it is preferable that the second light shielding surface and the third light shielding surface are any one of a wooden plate, a metal plate, a cloth, and a vinyl resin.

  In the light shielding device, the fourth light shielding surface is preferably any one of a wooden plate, a metal plate, a cloth, and a vinyl resin.

  Further, in the light shielding device, a first light shielding surface disposed on an upper portion of the frame body, and a second light shielding surface disposed on one side portion of the frame body along a longitudinal direction of the liquefied natural gas container. And a third light-shielding surface disposed on the other side of the frame body along the longitudinal direction of the liquefied natural gas container, and the second and third light-shielding surfaces are opened and closed. It may be any possible curtain, blind, or shutter.

  In the light shielding device, the light shielding cover further includes a fourth light shielding surface disposed on one side portion of the frame body intersecting a longitudinal direction of the liquefied natural gas container, and the fourth light shielding. The surface is preferably one of a curtain, a blind, and a shutter that can be opened and closed.

  Moreover, it is preferable that the light shielding device further includes a spacer that provides a gap between the first light shielding surface and the upper portion of the frame.

  In the light shielding device, the first light shielding surface, the second light shielding surface, and the third light shielding surface are integrated, and the first light shielding surface includes the second light shielding surface and the third light shielding surface, respectively. It is preferable that it is a wooden board or a metal plate of a magnitude | size which has a clearance gap between the outer surface of the said said opposing frame.

  In the light shielding device, the first light shielding surface, the second light shielding surface, and the third light shielding surface are integrated, and the first light shielding surface is the second, third, and fourth light shielding surfaces. It is preferable that the surface is a wooden plate or a metal plate having a gap between the opposing outer surfaces of the frames.

  Further, in the light shielding device, the horizontal rail provided on both sides of the frame body along the longitudinal direction of the container for liquefied natural gas, and the frame body so as to slide the horizontal rail and both A light shield made of cloth or vinyl resin fixed to the plurality of bar members so as to cover the plurality of bar members hanging on the horizontal rail and the plurality of bar members arranged at predetermined intervals between both ends of the horizontal rail. And the light shielding cover may cover the liquefied natural gas container by spreading the plurality of rod members to both ends of the horizontal rail.

  Moreover, in this light-shielding device, it may be integral with the liquefied natural gas container.

  Moreover, in this light-shielding device, it is good also as being removable with respect to the said container for liquefied natural gas.

  In the light shielding device, the liquefied natural gas container may be either integral with the trailer or detachable from the trailer.

  According to the present invention, the amount of vaporized liquefied natural gas can be reduced as compared with the prior art.

  At least the following matters will become apparent from the description of the present specification and the accompanying drawings.

=== Configuration of trailer ===
FIGS. 1A, 1 </ b> B, 1 </ b> C, 1 </ b> D, and 1 </ b> E are diagrams for explaining an example of a configuration of a trailer to which a light shielding device according to an embodiment of the present invention is applied. FIG. 1A is a side view showing a case where the trailer 10 is separated from the towing vehicle 20, and FIGS. 1B and 1C are perspective views of the trailer 10, and FIGS. ) Is a rear side view of the trailer 10.

  The trailer 10 mainly includes a tank 102, a frame 104 (frame body), a connecting portion 106, support legs 108, a wheel pair 110, and a wheel pair 112. Further, the trailer 10 is provided with a light shielding device having a base 120, light shielding covers 130 and 132, and rod members 130a and 132a. Moreover, in the following description, the tow truck 20 side of the paper is defined as the front, and the opposite side of the tow truck 20 is defined as the rear. Also, the right side is the right direction with respect to the forward direction, and the left side is the left direction with respect to the forward direction.

  The tank 102 is a cylindrical container that accommodates LNG, and has a heat insulating structure so that LNG can be stored. In addition, a pipe connection (not shown) for supplying gas to the satellite base is provided inside the open / close door 103 at the rear of the tank 102.

  The frame 104 is, for example, a rectangular parallelepiped skeleton that surrounds the tank 102 to protect the tank 102. Hereinafter, a portion constituted by the tank 102 and the frame 104 is referred to as an LNG container (liquefied natural gas container). The LNG container may be integrated with the trailer 10 or may be detachable from the trailer 10. In the present embodiment, it is assumed that the LNG container is detachable from the trailer 10. By making it detachable from the trailer 10, it becomes possible to transport the LNG container on a train or ship, for example. The frame 104 has a connecting portion 106 for connecting to the towing vehicle 20 at the lower part in the vertical direction in front of the frame 104. The trailer 10 is connected to the towing vehicle 20 by connecting the connecting portion 106 and the connecting portion 202 of the towing vehicle 20.

  The wheel pair 110 is provided on a support shaft provided in a direction perpendicular to the paper surface in the lower rear portion of the frame 104 with an equal distance from the midpoint of the support shaft. The wheel pair 110 includes a wheel that is rotatably supported by the support shaft, and a tire that is provided on the outer periphery of the wheel.

  The wheel pair 112 is provided on a support shaft provided in a direction perpendicular to the paper surface at a lower portion between the rear end portion of the frame 104 and the wheel pair 110 with an equal distance from the center point of the support shaft. It is what was done. The wheel pair 112 includes a wheel that is rotatably supported by the support shaft, and a tire that is provided on the outer periphery of the wheel.

  One support leg 108 is provided in the front of the frame 104 in the vertical direction where the center line connecting the midpoints of the spindles of the wheel pairs 110 and 112 hits, or in pairs with an equal distance from the center line. . The support leg 108 is configured to be extendable and contractable in the vertical direction. The length of the support leg 108 is adjusted such that the trailer 10 is separated from the road surface when the trailer 10 is pulled by the towing vehicle 20 and is in contact with the road surface when the trailer 10 is separated from the towing vehicle 20. . Thus, when the trailer 10 is separated from the towing vehicle 20, the container is supported together with the wheel pairs 110 and 112.

  The base 120 is provided along the longitudinal direction of the LNG container with the center line on the outer surface of the upper portion of the frame 104 as a center, for example, and light shielding covers 130 and 132 are provided on the right and left sides of the base 120 in the longitudinal direction, respectively. A region is provided for storing the. Further, the base 120 is longer than the length of the LNG container in the longitudinal direction as shown in FIG. 1A, and a hole (not shown) for connecting the U-shaped member 122 is provided at the front and rear of the base 120. Are provided in the vertical direction.

  The U-shaped member 122 is inserted into the inside of the frame 104 through a hole 105 opened in the upper part of the front side surface and the rear side surface of the frame 104. The U-shaped member 122 includes, for example, an L-shaped member inserted into the frame 104 through the hole 105 on the front side surface of the frame 104 and an L-shaped member inserted into the frame 104 from the hole 105 on the rear side surface of the frame 104. The members are combined inside the frame 104. Further, both ends of the U-shaped member 122 are male screws. Then, the male screw at one end of the U-shaped member is inserted from the lower side of the base 120 into the hole for connecting the U-shaped member 122 in front of the base 120, and screwed with a nut on the upper side of the base 120. . Similarly, the male screw at the other end of the U-shaped member is inserted from the lower side of the base 120 into the hole for connecting the U-shaped member 122 at the rear of the base 120, and screwed with a nut on the upper side of the base 120. Match.

  Then, by moving the U-shaped member 122 in the longitudinal direction of the frame 104, the base 120 can move in the longitudinal direction of the LNG container. If the U-shaped member 122 is configured to be detachable from the base 120 as described above, the base 120 is not only integrated with the frame 104 but also according to weather conditions such as cloudy sky in winter, for example. If the need for light shielding is low, it may not be attached to the frame 104.

The light shielding cover 130 is made of a cloth or vinyl resin that shields direct sunlight, and one side is coupled to the bar member 130a.
The light shielding cover 132 is made of a cloth or vinyl resin that shields direct sunlight, and one side is coupled to the rod member 132a.
The rod member 130a is pivotally supported on the right side in the longitudinal direction of the base 120 so as to be rotatable in a direction in which the light shielding cover 130 is pulled out or wound up.
The bar member 132a is pivotally supported on the left side in the longitudinal direction of the base 120 so as to be rotatable in a direction in which the light shielding cover 132 is pulled out or wound up. The rod members 130a and 132a are rotated in an arbitrary direction by manual operation or electric operation, for example.

  FIG.1 (b) is a perspective view of the state which does not cover the container for LNG. In this case, the light shielding covers 130 and 132 are wound around the rod members 130a and 132a, respectively.

  FIG.1 (c) is a perspective view of the state which covers the container for LNG. By rotating the rod members 130a and 132a manually or electrically in the direction in which the light shielding covers 130 and 132 are pulled out from the state shown in FIG. 1B, the light shielding cover 130 is an LNG container with the base 120 as a boundary. The right half is covered, and the light shielding cover 132 covers the left half of the LNG container with the base 120 as a boundary. The light shielding covers 130 and 132 can be separately wound and pulled out, and when only the right side or the left side of the LNG container is exposed to direct sunlight, The side exposed to direct sunlight may be selectively pulled out. In this manner, the direct sunlight can be effectively shielded by selectively pulling out the light shielding covers 130 and 132.

  Further, when performing gas piping work at the satellite base, LNG is supplied to the satellite base via the pipe 140 by connecting a pipe connecting portion (not shown) inside the open / close door 103 and the pipe 140. If there is rain during this piping work, workers may get soaked in rain water. In addition, workers may be exposed to direct sunlight for a long time during piping work. Furthermore, there is a possibility that a pipe connection portion (not shown) inside the open / close door 103 is corroded by rainwater. Therefore, in the trailer of the present invention, the base 120 is configured to be movable back and forth along the longitudinal direction of the LNG container.

  FIG.1 (d) is a side view which shows the case where the base 120 is moved ahead of the LNG container, and FIG.1 (e) is the side which shows the case where the base 120 is moved behind the LNG container. FIG.

  When the trailer 10 is traveling, the base 120 is moved in front of the LNG container as shown in FIG. At this time, the U-shaped member 122 is fixed by the fixing member 134 so that the U-shaped member 122 does not move back and forth with respect to the frame 104. By moving the base 120 forward in this way, it is possible to prevent the base 120 from protruding into the rear part of the LNG container and obstructing traveling. As shown in FIG. 1A, since there is a space above the towing vehicle 20 side, the base 120 can be moved to the front of the LNG container.

  For example, when the trailer 10 is temporarily installed at a satellite base and supplies LNG to the satellite base, the fixing member 134 is removed and the base 120 is moved to the rear of the LNG container as shown in FIG. To do. In this way, when the base 120 is moved to the rear of the LNG container and the light shielding covers 130 and 132 are pulled out in this state, the rear side of the LNG container is covered. Thus, for example, it is possible to prevent the worker from being exposed to rainwater during piping work. Furthermore, it is possible to prevent a pipe connection portion (not shown) inside the open / close door 103 from being corroded by rainwater. As described above, the light shielding covers 130 and 132 can be used as eaves by moving the base 120 along the longitudinal direction of the LNG container. As shown in FIG. 1C, a gap is generated between the bar members 130a and 132a and the upper surface of the frame 104. Therefore, even when the LNG container is covered with the light shielding covers 130 and 132, the air permeability is maintained. A good space can be secured and the occurrence of BOG can be reduced.

<< Second Embodiment >>
FIGS. 2A, 2B, 2C, and 2D are diagrams illustrating a trailer to which the light-shielding device according to the second embodiment of the present invention is applied. FIGS. 2A, 2B, and 2C are perspective views sequentially illustrating a change from a state in which the LNG container is not covered to a state in which the LNG container is covered, and FIG. It is a perspective view which expands and shows a part of 2 (c). Note that parts having the same configuration as in FIG.

  The trailer 12 shown in FIGS. 2A, 2B, 2C, and 2D includes a light shielding surface 200 (first light shielding surface of claim 5) and a light shielding surface 200a (second light shielding surface of claim 5). A light shielding surface 200b (a third light shielding surface of claim 5), a light shielding surface 200c (a fourth light shielding surface of claim 6), a fixing member 202, and a spacer 204. The light shielding surfaces 200, 200a, 200b, and 200c are integrated and constitute a light shielding device for an LNG container.

The light shielding surface 200 is disposed on the frame 104.
The light shielding surface 200a is disposed on the left side surface of the frame 104 along the longitudinal direction of the LNG container, and is provided to be rotatable about the left end portion of the light shielding surface 200 as an axis.
The light shielding surface 200b is disposed on the right side surface of the frame 104 along the longitudinal direction of the LNG container, and is provided so as to be rotatable about the right end portion of the light shielding surface 200 as an axis.
The light shielding surface 200c is disposed on the rear side surface of the frame 104 intersecting the longitudinal direction of the LNG container, and is provided so as to be rotatable about the rear end portion of the light shielding surface 200 as an axis.
In the present embodiment, the light shielding surfaces 200, 200a, 200b, and 200c are wood plates or metal plates.

  The fixing member 202 fixes the light shielding surfaces 200a, 200b, and 200c folded on the light shielding surface 200 in a folded state. For example, as shown in FIG. 2A, a clasp is provided at a predetermined position on the right end of the upper surface of the light shielding surface 200a in the folded state, and corresponds to the clasp at the right end of the upper surface of the light shielding surface 200b in the folded state. You may provide the receiving part for inserting the said clasp in a position. In this case, the light shielding surface 200a and the light shielding surface 200b are fixed in a folded state by fitting the clasp of the light shielding surface 200a into the receiving portion of the light shielding surface 200b. In addition, when the receiving part of the light shielding surface 200b is made of a flexible material such as cloth, the light shielding surface 200b is only slightly shifted from the state where the light shielding surface 200a and the light shielding surface 200b are fixed in a folded state. The receiving part can be detached from the clasp of the light shielding surface 200a.

  Further, for example, a removable cloth tape is provided at a predetermined position on the right end of the upper surface of the light shielding surface 200a in the folded state and a predetermined position on the right end of the upper surface of the light shielding surface 200b in the folded state, so that the removable cloth on the light shielding surface 200a is provided. The light shielding surface 200a and the light shielding surface 200b may be fixed in a folded state by overlapping the tape and the removable cloth tape on the light shielding surface 200a.

  The spacer 204 is for providing a gap between the frame 104 and the upper part of the light shielding surface 200. For example, the spacer 204 has male screws (not shown) smaller than the diameter at the center at both ends, and an upper portion of the frame 104 and a hole (not shown) through which the male screws of the spacer 204 are passed through the light-shielding surface 200 at predetermined positions. Is provided. Then, one male screw of the spacer 204 is passed through the hole of the frame 104 from the upper side, and screwed with a nut on the lower side. Further, the other male screw of the spacer 204 is passed through the hole of the light shielding surface 200 from the lower side, and screwed with a nut on the upper side. A plurality of spacers 204 are provided between the upper part of the frame 104 and the light shielding surface 200 facing the upper part of the frame 104. If the spacer 204 is configured to be detachable from the frame 104 as described above, the light shielding surfaces 200, 200a, 200b, and 200c are not only integrated with the frame 104, but also in a weather condition such as a cloudy sky in winter, for example. Accordingly, when the need for light shielding is low, the frame 104 may not be attached.

  When the light shielding surfaces 200a, 200b, and 200c do not cover the LNG container, for example, as shown in FIG. 2A, the light shielding surfaces 200c, 200b, and 200a are arranged in this order. Folded on top. The light shielding surface 200a and the light shielding surface 200b are fixed in a folded state by the fixing member 202.

  When the LNG container is covered from the state shown in FIG. 2A, first, the fixing member 202 that fixes the light shielding surface 200a and the light shielding surface 200b is removed, and the light shielding surface 200a is replaced with that shown in FIG. As shown in FIG. Next, the light shielding surface 200 b is rotated toward the right side surface of the frame 104. Then, as shown in FIG. 2C, the light shielding surface 200 c is rotated toward the rear side surface of the frame 104.

  At this time, when the spacer 204 is provided as shown in FIG. 2D, a gap is generated between the light shielding surface 200 and the upper portion of the frame 104. Therefore, even if the periphery of the LNG container is covered with the light shielding cover, ventilation is performed. Space with good performance can be secured, and the occurrence of BOG can be reduced.

  In addition, the size of the light shielding surface 200 in the state where it covers the LNG container, the light shielding surface 200a and the left side surface of the frame 104, the light shielding surface 200b and the right side surface of the frame 104, and the light shielding surface 200c and the rear side surface of the frame 104, respectively. When the size is such that the gap is generated, the air permeability is further improved when the LNG container is covered.

  The light shielding surface 200a and the light shielding surface 200b may cover only the right side and the left side of the LNG container. However, by providing the light shielding surface 200c, direct sunlight to the rear of the LNG container is further shielded. In addition, rain water can be prevented from entering the rear of the LNG container. Further, the light shielding surfaces 200a, 200b, and 200c may be selectively rotated according to the direction of direct sunlight so as to selectively cover the side surfaces of the LNG container. Even when the side surface of the LNG container is selectively covered, the generation amount of BOG can be reduced as compared with the case where light shielding is not performed.

  Further, instead of the light shielding surfaces 200a, 200b, and 200c, a cover such as cloth or vinyl resin may be used. In this case, in order to keep the LNG container uncovered, it may be folded over the light shielding surface 200, or rolled over the light shielding surface 200 and fixed with, for example, a removable cloth tape. It may be. Further, in this case, a wood plate or a metal plate may be used as the light shielding surface 200. For example, when a frame that subdivides the upper surface of the frame 104 is provided, the light shielding surface 200 may be made of cloth or vinyl resin and droop due to its own weight. Therefore, a cloth or a vinyl resin can be used for the light shielding surface 200.

<< Third Embodiment >>
FIGS. 3A and 3B are views showing a trailer to which the light-shielding device according to the third embodiment of the present invention is applied. FIG. 3A is a perspective view showing a state where the LNG container is not covered, and FIG. 3B is a perspective view showing a state where the LNG container is covered. Note that parts having the same configuration as in FIG.

  The trailer 14 shown in FIGS. 3A and 3B includes a light shielding surface 300 (first light shielding surface according to claim 11), a blind 302 (second light shielding surface according to claim 11), and a blind 304 (claim). 11 third light shielding surface) and a blind 306 (fourth light shielding surface of claim 12). The light shielding surface 300 and the blinds 302, 304, and 306 constitute a light shielding device.

  The light shielding surface 300 is disposed on the frame 104. The light shielding surface 300 is between the left side surface of the frame 104 and the left end portion of the light shielding surface 300, between the right side surface of the frame 104 and the right end portion of the light shielding surface 300, and the rear side surface of the frame 104 and the rear surface of the light shielding surface 300. It is provided in a size that creates a gap between each end. In the present embodiment, the light shielding surface 300 is a wooden plate or a metal plate.

The blind 302 is disposed below the light shielding surface 300 between the left side surface of the frame 104 and the left end portion of the light shielding surface 300, and can be opened and closed in the vertical direction.
The blind 304 is disposed below the light shielding surface 300 between the right side surface of the frame 104 and the right end of the light shielding surface 300, and can be opened and closed in the vertical direction.
The blind 306 is disposed under the light shielding surface 300 between the rear side surface of the frame 104 intersecting the longitudinal direction of the LNG container and the rear end portion of the light shielding surface 300, and can be opened and closed in the vertical direction.

  When the blinds 302, 304, and 306 are opened, the blinds 302, 304, and 306 are lifted, and the LNG container is not covered as shown in FIG. From this state, by closing the blinds 302, 304, and 306, respectively, the blinds 302, 304, and 306 are lowered to cover the LNG container as shown in FIG.

  A spacer similar to the spacer 204 in the second embodiment may be provided between the light shielding surface 300 and the upper portion of the frame 104. By providing the spacer, a gap is generated between the light shielding surface 300 and the upper portion of the frame 104, so that a space with good air permeability can be secured in a state of covering the LNG container, and generation of BOG can be reduced.

  In this embodiment, the light shielding surface 300 and the blinds 302, 304, and 306 are integrally provided. However, the light shielding surface 300 and the blinds 302, 304, and 306 may be separately provided. That is, the upper ends of the blinds 302, 304, and 306 may be fixed to the upper ends of the left side surface, the right side surface, and the rear side surface of the frame 104 so as to open and close. In this case, it is not necessary to make the size of the light shielding surface 300 larger than the upper part of the frame 104. Further, in the case where a frame that subdivides the upper surface of the frame 104 is provided on the upper surface of the frame 104, for example, even if the light shielding surface 300 is made of cloth or vinyl resin, dripping due to its own weight can be prevented. Resins and the like can also be used.

  Further, when the light shielding surface 300 and the blinds 302, 304, and 306 are integrally provided, the light shielding surface 300 may be attached to and detached from the frame 104. Further, even when the light shielding surface 300 and the blinds 302, 304, and 306 are provided separately, the light shielding surface 300 and the blinds 302, 304, and 306 may be attached to and detached from the frame 104, respectively.

  In this embodiment, the blinds 302, 304, and 306 are used as the light shielding cover. For example, the front and rear of the right side surface of the frame 104, the front and rear of the left side surface, and the right and left sides of the rear side surface, respectively. For example, a metal shutter that opens and closes in the vertical direction along the shutter rail may be provided.

  Further, the lower part of the light shielding surface 300 between the left side surface of the frame 104 and the left end portion of the light shielding surface 300, the lower portion of the light shielding surface 300 between the right side surface of the frame 104 and the right end portion of the light shielding surface 300, and the rear part of the frame 104. A curtain rail may be provided at a lower portion of the light shielding surface 300 between the side surface and the rear end portion of the light shielding surface 300, and a cloth curtain that opens and closes along the curtain rail, for example, may be provided. Even when the shutter or curtain is provided, it can be provided separately from the light shielding surface 300 as in the case of the blinds 302, 304, and 306.

<< Fourth Embodiment >>
4A, 4B, and 4C are views showing a trailer according to a fourth embodiment of the present invention. 4A is a perspective view showing a state in which the LNG container is not covered, FIG. 4B is a perspective view showing a state in which the LNG container is covered, and FIG. 4C is a view in FIG. It is a perspective view which expands and shows a part of a). Note that parts having the same configuration as in FIG.

  The trailer 16 shown in FIGS. 4A, 4 </ b> B, and 4 </ b> C is provided with a light shielding cover 400, a horizontal rail 402, and a bar member 406. The light shielding cover 400, the horizontal rail 402, and the bar member 406 constitute a light shielding device.

The horizontal rail 402 is provided along the longitudinal direction at the upper part and the lower part of the left side surface and the right side surface of the frame 104.
The bar member 406 is configured to straddle the frame 104 so as to surround the upper surface, the left side surface, and the right side surface of the frame 104, and the shape may be, for example, a U-shape, a semicircle, a semi-ellipse, or the like. A plurality of bar members 406 are provided at a predetermined interval between the front end portion and the rear end portion of the horizontal rail 402. In the plurality of bar members 406, the foremost bar member 406 is fixed to the front end of the frame 104.
The plurality of bar members 406 have sliding portions 408 provided so as to be slidable with respect to the horizontal rails 402 on the right side surface and the left side surface of the frame 104. Then, as the sliding portion 408 slides on the horizontal rail 402, the bar member 406 also slides along the horizontal rail 402.
The light shielding cover 400 is, for example, cloth or vinyl resin that shields direct sunlight, and is adhered to the bar member 406 so as to cover the plurality of bar members 406.

  In the above configuration, when the LNG container is not covered, the bar member 406 is slid in front of the horizontal rail 402 as shown in FIG. In this state, the sliding portion 408 is locked so as not to slide on the horizontal rail 402 by a lock mechanism (not shown).

  On the other hand, when the LNG container is to be covered, the lock mechanism is unlocked and the bar member 406 is slid rearward of the horizontal rail 402 so that the light shielding cover 400 is removed from the front end of the horizontal rail 402. Spread to the rear edge. In this state, the LNG container can be shielded from direct sunlight. Note that even if the sliding portion 408 of the rearmost bar member 406 is detached from the horizontal rail 402 at the lower part between the rearmost bar member 406 and the bar member 406 adjacent to the rearmost bar member 406, the bar A reinforcing member may be provided so that the member 406 does not hang down. By doing so, even if the last bar member 406 reaches the rear end of the horizontal rail 402, it can be extended backward by the adjacent interval of the bar members 406. Therefore, in a state where the LNG container is covered, the rear side surface of the LNG container can be protected from oblique sunlight and rainwater. In addition, the rearmost bar member 406 is configured by a plurality of bellows that can be expanded and contracted in a bellows manner with the lower left and right sliding portions 408 as axes, and the rearmost bar member 406 is formed at the rear end of the horizontal rail 402. When it reaches, the rear side surface of the LNG container may be covered from above the frame 104 in an accordion manner.

  Even when the LNG container is covered with the light shielding cover 400, since there is a gap between the light shielding cover 400 and the frame 104, a space with good air permeability can be secured, and the occurrence of BOG can be reduced.

  The light shielding cover 400 may be detachable from the frame 104 by making the sliding portion 408 detachable from the rail 402.

  As described above, the light-shielding device of the present invention is provided with the light-shielding cover that can take both the state where the LNG container is covered and the state where the LNG container is not covered. The amount of generation can be reduced as compared with the prior art.

  In addition, when the light shielding device is configured integrally with the LNG container, for example, when the LNG is transported or when the LNG is stored, either the state of covering the LNG container or the state of not covering the LNG container It can be. Further, when the light shielding device is attached to and detached from the LNG container, for example, the light shielding device can be stored in the satellite base, and the light shielding device can be attached after the LNG container is installed in the satellite base. Further, by removing the light shielding device when the LNG container is transported by the trailer, the light shielding device can be prevented from interfering with the travel of the trailer.

  In the above embodiment, the case where the LNG container is detachable from the trailer has been described. However, the LNG container may be integrated with the trailer. When the LNG container is integrated with the trailer, the LNG is transported by being pulled by the towing vehicle from the shipping base, and when it arrives at the satellite base, it is separated from the towing vehicle and temporarily used as a storage tank. Can be installed. Also, when the LNG container is integrated with the trailer, the light shielding device may be integrated with the LNG container, or may be detachable from the LNG container.

  The above-described embodiment is intended to facilitate understanding of the present invention, and is not intended to limit the present invention. The present invention is changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

It is a figure which shows the trailer to which the light-shielding device of 1st Embodiment concerning this invention is applied. FIG. 1 (a) is a side view showing a case where the trailer is separated from the towing vehicle, FIGS. 1 (b) and 1 (c) are perspective views of the trailer, and FIGS. 1 (d) and 1 (e) are trailers. FIG. It is a figure which shows the trailer to which the light-shielding device of 2nd Embodiment concerning this invention is applied. FIGS. 2A, 2B, and 2C are perspective views sequentially illustrating a change from a state in which the LNG container is not covered to a state in which the LNG container is covered, and FIG. It is a perspective view which expands and shows a part of 2 (c). It is a figure which shows the trailer to which the light-shielding device of 3rd Embodiment concerning this invention is applied. FIG. 3A is a perspective view showing a state where the LNG container is not covered, and FIG. 3B is a perspective view showing a state where the LNG container is covered. It is a figure which shows the trailer to which the light-shielding device of 4th Embodiment concerning this invention is applied. 4A is a perspective view showing a state in which the LNG container is not covered, FIG. 4B is a perspective view showing a state in which the LNG container is covered, and FIG. 4C is a view in FIG. It is a perspective view which expands and shows a part of a).

Explanation of symbols

10, 12, 14, 16 Trailer 20 Towing vehicle 102 Tank 103 Open / close door 104 Frame 105 Hole 106 Connecting portion 108 Supporting leg 110, 112 Wheel pair 120 Base 122 U-shaped member 130, 132, 400 Light shielding cover 130a, 132a, 406 Bar member 140 Pipe 200, 200a, 200b, 200c, 300 Shading surface 202 Fixing member 204 Spacer 302, 304, 306 Blind 402 Horizontal rail 408 Sliding part

Claims (19)

A light-shielding device provided outside the frame to shield light from a liquefied natural gas container having a tank containing liquefied natural gas and a frame surrounding the tank to protect the tank;
A light-shielding device characterized by being capable of taking both a state of covering the liquefied natural gas container and a state of not covering the liquefied natural gas container. A pair of shading covers made of cloth or vinyl resin;
A pair of bar members respectively coupled to one side of the pair of light shielding covers to enable drawing and winding of the pair of light shielding covers;
A base that is provided in the longitudinal direction of the liquefied natural gas container in the upper part of the frame body and rotatably supports the pair of rod members;
The pair of light-shielding covers covers both the liquefied natural gas containers with the base as a boundary by being drawn out from the state wound around the pair of rod members,
The light-shielding device according to claim 1.   The light-shielding device according to claim 2, wherein the pair of light-shielding covers are selectively pulled out.   The light shielding device according to claim 2, wherein the base is movable in a longitudinal direction of the liquefied natural gas container. A first light shielding surface disposed on an upper portion of the frame, a second light shielding surface disposed on one side of the frame along a longitudinal direction of the liquefied natural gas container, and the liquefied natural gas container. A third light-shielding surface disposed on the other side of the frame body along the longitudinal direction of the
The light shielding device according to claim 1, wherein the second and third light shielding surfaces are foldable on an upper portion of the first light shielding surface. The light shielding cover further includes:
A fourth light-shielding surface disposed on one side of the frame that intersects the longitudinal direction of the container for liquefied natural gas; and
The light shielding device according to claim 5, wherein the fourth light shielding surface is foldable on an upper portion of the first light shielding surface.   The light-shielding device according to claim 5, further comprising a spacer that provides a gap between the first light-shielding surface and an upper portion of the frame.   6. The first light-shielding surface is a wood plate or a metal plate having a gap between the second light-shielding surface and the third light-shielding surface and the outer surface of the frame body facing each other. The light shielding apparatus in any one of thru | or 7.   9. The light shielding device according to claim 8, wherein the second light shielding surface and the third light shielding surface are any one of a wooden board, a metal plate, a cloth, and a vinyl resin.   The light-shielding device according to claim 9, wherein the fourth light-shielding surface is any one of a wooden plate, a metal plate, a cloth, and a vinyl resin. A first light shielding surface disposed on an upper portion of the frame, a second light shielding surface disposed on one side of the frame along a longitudinal direction of the liquefied natural gas container, and the liquefied natural gas container. A third light-shielding surface disposed on the other side of the frame body along the longitudinal direction of the light-shielding cover,
The light-shielding device according to claim 1, wherein the second and third light-shielding surfaces are any of curtains, blinds, and shutters that can be opened and closed. The shading cover is
A fourth light-shielding surface disposed on one side of the frame that intersects the longitudinal direction of the liquefied natural gas container;
The light-shielding device according to claim 11, wherein the fourth light-shielding surface is one of a curtain, a blind, and a shutter that can be opened and closed.   The light shielding device according to claim 11, further comprising a spacer that provides a gap between the first light shielding surface and the upper portion of the frame. The first light shielding surface, the second light shielding surface, and the third light shielding surface are integrated.
The said 1st light-shielding surface is a wooden board or a metal plate of the magnitude | size which has a clearance gap between the said 2nd and 3rd light-shielding surfaces and the outer surface of the said frame which each opposes. The light shielding apparatus in any one of thru | or 13. The first light shielding surface, the second light shielding surface, and the third light shielding surface are integrated.
The first light-shielding surface is a wooden plate or a metal plate having a size between the second, third, and fourth light-shielding surfaces and the outer surface of the frame body facing each other. The light shielding device according to claim 12 or 13. Horizontal rails provided on both sides of the frame along the longitudinal direction of the liquefied natural gas container;
A plurality of bar members straddling the frame and hanging on both the horizontal rails to slide the horizontal rails;
A light-shielding cover made of cloth or vinyl resin that is fixed to the plurality of rod members so as to cover the plurality of rod members arranged at predetermined intervals between both ends of the horizontal rail,
2. The light shielding device according to claim 1, wherein the light shielding cover covers the liquefied natural gas container by spreading the plurality of rod members to both ends of the horizontal rail.   The light-shielding device according to any one of claims 1 to 16, wherein the light-shielding device is integral with the liquefied natural gas container.   The light-shielding device according to any one of claims 1 to 16, wherein the light-shielding device can be attached to and detached from the liquefied natural gas container. The light-shielding device according to any one of claims 1 to 18, wherein the liquefied natural gas container is either integral with a trailer or detachable from the trailer.

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