KR100729217B1 - Cryogenic liquid gas cylinder for natural gas of vehicle - Google Patents

Abstract

A cryogenic cylinder for natural gas of a vehicle is provided to prevent breakage caused due to shock generated according to the increase of internal pressure by keeping a space corresponding to the height separated between the upper side of an inner wall of a main storage tank and the upper side of an auxiliary storage tank, and the inner extra space of the auxiliary storage tank all the time. The cryogenic cylinder for natural gas of a vehicle is composed of a main storage tank(10) storing cryogenic fluid with making a space between inner and outer walls(11,12) vacuum; an auxiliary storage tank(20) formed with an inflow hole(21) at the upper side and installed adjacently to the upper side of the inner wall of the main storage tank; a fluid supply line(30) penetrating through the inside of the main storage tank from the outside so as to feed the cryogenic fluid into the main storage tank; an opening and closing tool(40) combined through the lower side of the auxiliary storage tank and opened and closed by buoyancy according to the level of the cryogenic fluid supplied from the fluid supply line so as to deliver the cryogenic fluid and vaporized gas into the auxiliary storage tank or discharge the cryogenic fluid and vaporized gas; a discharge line(50) installed with penetrating through the inside of the main storage tank from the outside so as to discharge the cryogenic fluid and vaporized gas stored in the main storage tank; and a line combining unit(70) joined through the main storage tank with integrally surrounding parts of the fluid supply line and the discharge line penetrating through the inside of the main storage tank so as to cut off heat transferred from the outside to the inside of the main storage tank.

Description

Cryogenic Liquid Gas Cylinder for Natural Gas of Vehicle

1 is an overall perspective view showing a cryogenic container according to an embodiment of the present invention,

2 is an overall cross-sectional view of FIG.

3 is an enlarged cross-sectional view of portion A of FIG.

Figure 4 is an enlarged cross-sectional view showing the opening and closing in accordance with another embodiment of the present invention,

5 is an enlarged cross-sectional view of portion B of FIG.

Figure 6 is an enlarged cross-sectional view showing another embodiment of the line coupling portion and the fluid supply line and the discharge line of the components of the cryogenic container according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: main reservoir 11: inner wall

12: outer wall 20: auxiliary storage tank

21,72: Inlet hole 30: Fluid supply line

31: spray nozzle 40: opening and closing

41,41a: Distributors 42,42a, 75: Through holes

43, 43a: flow shaft 44, 44a: fixed plate

45, 45a: buoyancy plate 46: elastic body

47: communication hole 50: discharge line

51: gas discharge pipe 52: fluid discharge pipe

60: level gauge 70: line coupling

71: binder 73: discharge hole

74: outer wall connector 76: inner wall connection

77: bonding cover

The present invention relates to a cryogenic container of a natural gas for a vehicle, and more particularly to a cryogenic container of a natural gas for a vehicle for stably storing a fluid converted into a liquid at a very low temperature, such as natural gas, nitrogen, oxygen, carbon dioxide, hydrogen, argon.

In general, gases having low boiling points, such as natural gas, nitrogen, oxygen, carbon dioxide, hydrogen, argon, helium, and neon, are converted to a liquid state below -150 ° C.

The container for storing the cryogenic liquid needs to be kept at a low temperature in order to keep the stored fluid in a liquid state. Therefore, the container for storing the cryogenic liquid is formed of a double wall that can maintain a vacuum in both an empty state and a filled state. It will effectively prevent heat intrusion.

However, even if cryogenic liquid is stored in a cryogenic vessel having a double wall structure in a vacuum state, the cryogenic liquid may not be completely insulated, and the cryogenic liquid is partially formed due to the heat generated by friction with the cryogenic vessel surface due to the shaking of the cryogenic liquid. As it vaporizes, it transforms into a gaseous state.

Therefore, the conventional cryogenic vessel increases the internal pressure while part of the cryogenic liquid is converted into a gas in a state where the cryogenic liquid is full.

In other words, when the cryogenic container is filled with the cryogenic liquid in liquid state, as time passes, the gas is converted into a gaseous state as part of it is vaporized, and the internal pressure rises sharply compared with the initial liquid filled state. There is a problem inherent in the risk of being broken.

The present invention has been made to solve the above-mentioned problems, the vehicle is able to prevent the risk of damage even if an impact occurs by keeping the internal pressure stable even if some liquid is converted to gas in a state filled with cryogenic liquid therein It is an object to provide a cryogenic container of natural gas.

In the present invention, by processing the fluid supply line and the discharge line by twisting 360 °, the overall length of the line is extended to reduce the heat loss to improve the thermal insulation performance of the container, the risk of rupture due to the strain of the line itself during the vibration test is greatly It is an object of the present invention to provide a cryogenic container of natural gas for a vehicle that can be reduced.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention.

Furthermore, the objects and advantages of the present invention can be realized by means and combinations indicated in the claims.

Cryogenic container of the natural gas for a vehicle of the present invention for achieving the above object, the main storage tank for storing the cryogenic fluid therein in a state formed between the inner wall and the outer wall as a vacuum space; An auxiliary storage tank installed adjacent to an upper side of an inner wall of the main storage tank in an inlet hole formed at an upper side thereof; A fluid supply line penetrating into the main reservoir from the outside and supplying cryogenic fluid to the main reservoir; An opening and closing mechanism for allowing the cryogenic fluid and the vaporized gas to be discharged into the auxiliary storage tank while being opened and closed by buoyancy according to the level of the cryogenic fluid supplied from the fluid supply line in a state of being penetrated through the lower one side of the auxiliary storage tank; A discharge line penetrating into the main reservoir from the outside to discharge the cryogenic fluid and vaporized gas stored in the main reservoir to the outside; And a line coupling part penetratingly coupled to the main storage tank to integrally surround a portion passing through the inner portion of the main storage tank of the fluid supply line and the discharge line to block heat from being transferred from the outside into the main storage tank. do.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, the terms or words used in this specification and claims should not be limited to the usual or dictionary meanings, and the inventors will be required to properly define the concepts of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is an overall perspective view showing a cryogenic container according to an embodiment of the present invention, Figure 2 is a full cross-sectional view of FIG.

As illustrated, the cryogenic container of the present embodiment includes a main storage tank 10, an auxiliary storage tank 20, a fluid supply line 30, an opening and closing port 40, a discharge line 50, and a line coupling part 70. .

The main storage tank 10 is a tank for storing a cryogenic fluid that becomes a liquid in a cryogenic state, such as natural gas, nitrogen, oxygen, carbon dioxide, hydrogen, argon, helium, neon.

The main reservoir 10 forms a vacuum space between the inner wall 11 and the outer wall 12 so as to prevent heat penetration and to keep the cryogenic fluid stored in the low temperature state efficiently.

In addition, a heat insulating material may be filled in the vacuum space between the inner wall 11 and the outer wall 12 of the main storage tank 10 to increase the heat penetration prevention effect.

In addition, a level gauge 60 may be installed in the main reservoir 10 so as to determine the level of the cryogenic fluid to be stored.

The auxiliary storage tank 20 is a tank installed in the main storage tank 10 to provide a space in which the gas vaporized by the temperature rise among the cryogenic fluids stored in the main storage tank 10 can be stored.

The auxiliary storage tank 20 is installed to be adjacent to the upper side of the inner wall 11 of the main storage tank 10, the cryogenic fluid and vaporized gas supplied to the main storage tank 10 is introduced into the upper one side. Form a small inlet hole 21 as much as possible.

Therefore, when the cryogenic fluid is supplied to the main storage tank 10 while the supply is blocked, the ultra low temperature of the inner wall 11 of the main storage tank 10 and the upper side of the auxiliary storage tank 20 are separated. The fluid is introduced into the auxiliary storage tank 20 through the inlet hole 21. As a result, a space equal to the height of the inner wall 11 of the main storage tank 10 and the upper side of the auxiliary storage tank 20 and the remaining space of the auxiliary storage tank 20 are always maintained so that the vaporized gas is introduced. It will provide a space where it can be.

The fluid supply line 30 is a pipe for supplying cryogenic fluid to the main storage tank 10, and is installed through the main storage tank 10 from the outside.

One end of the fluid supply line 30 introduced into the main reservoir 10 is installed to be adjacent to the upper side of the inner wall 11 of the main reservoir 10 in a vertical state.

In addition, one end portion of the fluid supply line 30 introduced into the main storage tank 10 is provided with an injection nozzle 31 to spray supply cryogenic fluid to the main storage tank 10 in a spray state.

Therefore, the cryogenic fluid sprayed upward in the main reservoir 10 through the injection nozzle 31 of the fluid supply line 30 may collapse the source of pressure while compressing the gas in the main reservoir 10. By reducing the internal pressure, the cryogenic fluid can be easily supplied to the main reservoir (10).

The opening and closing port 40 is coupled to the lower side of the auxiliary storage tank 20 to be opened and closed by buoyancy according to the storage water level of the cryogenic fluid supplied from the fluid supply line 30 to assist the cryogenic fluid and vaporized gas. It is a member to be discharged to the reservoir 20.

As shown in FIG. 3, the opening and closing port 40 has a through-hole 42 having a stepped portion formed therein in the longitudinal direction and vertically coupled to the lower one side of the auxiliary storage tank 20 by a through pipe 41. It includes a flow shaft 43 is inserted into the through hole 42 of the distribution pipe 41 in a state in which the fixing plate 44 and the buoyancy plate 45 is coupled to the upper end and the lower end, respectively.

Here, the fixing plate 44 of the flow shaft 43 is fixed so as not to be separated by gravity in the state in which the flow shaft 43 is inserted into the through hole 42 of the distribution pipe 41, the buoyancy plate 45 causes the flow shaft 43 to rise by the buoyancy of the cryogenic fluid supplied to the main reservoir 10.

In addition, the opening and closing port 40 is introduced into the through hole 42 in a state of being caught on the stepped portion of the distribution pipe 41, the flow shaft 43 inserted into the through hole 42 of the distribution pipe 41. An elastic body 46 to be extrapolated is provided.

The elastic body 46 creates a spring between the inner circumferential surface of the flow pipe 41 and the outer circumferential surface of the flow shaft 43 so that the fluid and gas can be easily flowed through the through hole 42. It is preferable to use.

Therefore, the elastic body 46 is a fixed plate 44 and the buoyancy plate (the buoyancy plate of the fluid shaft 43) when the level of the cryogenic fluid supplied to the main reservoir 10 is located below the buoyancy plate 45 45) are respectively kept spaced apart from the upper end and the lower end of the distribution pipe 41, respectively.

That is, the opening and closing port 40 is the vaporized gas when the level of the cryogenic fluid supplied to the main reservoir 10 is lower than the buoyancy plate 45 of the flow shaft 43 through the through hole 42 To be introduced into the secondary storage (20).

When the water level continues to rise from the point where the cryogenic fluid is in contact with the buoyancy plate 45 of the flow shaft 43, the buoyancy plate 45 is raised by buoyancy while being in contact with the lower end of the distribution pipe 41. This prevents the flow of fluid and gas through the through hole 42.

4 is a view showing another embodiment of the opening and closing port 40.

The opening and closing hole 40 has a through hole 42a having a stepped length formed therein, and the auxiliary storage tank having a communication hole 47 communicating with the auxiliary storage tank 20 and the through hole 42a. The distribution pipe 41a which is vertically coupled to the lower one side of the 20 and the buoyancy plate 45a having the fixing plate 44a and the locking portion 46 are respectively coupled to the upper end and the lower end of the distribution pipe 41a. It includes a flow shaft (43a) is inserted into the through hole (42a) of.

Therefore, when the water level of the cryogenic fluid supplied to the main storage tank 10 is lower than the buoyancy plate 45a of the flow shaft 43a, the opening and closing port 40 communicates with the through hole 42a. Through the ball 47 is to be introduced into the auxiliary reservoir (20).

When the water level continues to rise from the point where the cryogenic fluid comes into contact with the buoyancy plate 45a of the flow shaft 43a, the buoyancy plate 45a rises due to the buoyancy while the through-hole 42a of the flow pipe 41a rises. The secondary storage tank 20 of the fluid and gas through the through hole 42a and the communication hole 47 by sealing the through hole 42a while the engaging portion 46 of the flow shaft 43a is inserted into the through hole 42a. It blocks the inflow into the interior.

The discharge line 50 is a pipe for discharging the cryogenic fluid and vaporized gas stored in the main storage tank 10 to the outside, and is installed through the main storage tank 10 from the outside.

The discharge line 50 has one end portion bent in a vertical state adjacent to the upper side of the inner wall 11 of the main storage tank 10 to discharge the vaporized gas to the outside and one end portion thereof. A fluid discharge pipe 52 is formed to be bent adjacent to the bottom of the inner wall 11 of the main reservoir 10 in a vertical state to discharge the cryogenic fluid to the outside.

The line coupling part 70 is penetrated and coupled to the main storage tank 10 while integrally surrounding a portion passing through the inner portion of the main storage tank 10 of the fluid supply line 30 and the discharge line 50. It is a member that blocks heat from being transferred from the outside into the main reservoir 10.

This, the line coupling portion 70 is a state in which the inlet hole 72 and the pair of outlet holes 73 connected to the fluid supply line 30 and the discharge line 50 is formed as shown in FIG. Combination body 71 is penetratingly coupled to the outer wall 12 of the main storage tank 10 from the outside of the furnace, and inner wall 11 and outer wall of the main storage tank 10 in a state of being coupled to one end of the assembly 71 ( A plurality of through-holes 75 are formed in one side portion located between the 12 and the outer wall connection pipe 74 into which the fluid supply line 30 and the discharge line 50 are inserted.

In addition, the line coupling part 70 has an inner wall connection pipe 76 which surrounds the outer wall connection pipe 74 in a state where one end thereof is penetrated and coupled to the inner wall 11 in the interior of the main reservoir 10; Coupling cover through which the fluid supply line 30 and the discharge line 50 pass in a state in which one end of the outer wall connecting pipe 74 and the inner wall connecting pipe 76 introduced into the main storage tank 10 are hermetically coupled. (77).

At this time, since the inner wall connection pipe 76 and the outer wall connection pipe 74 and the inside of the outer wall connection pipe 74 communicate with the vacuum space between the inner wall 11 and the outer wall 12 of the main storage unit 10. A vacuum state such as between the inner wall 11 and the outer wall 12 of the main storage unit 10 may be used to block heat transfer from the outside into the main storage unit 10.

In addition, a heat insulating material may be filled between the inner wall connection pipe 76 and the outer wall connection pipe 74 and inside the outer wall connection pipe 74 to increase an external heat transfer effect.

That is, each of the gas discharge pipe 51 and the fluid discharge pipe 52 of the fluid supply line 30 and the discharge line 50 penetrates the coupling cover 77 of the line coupling portion 70 while the outer wall connection pipe 74 is connected to the inlet hole 72 and the outlet hole 73 of the combination 71 in the state introduced into the interior to block the heat transfer from the outside to the main reservoir (10).

As described above, the cryogenic fluid storage and discharging process of the cryogenic container according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 5.

First, when looking at the cryogenic fluid storage in the cryogenic container, the cryogenic fluid is sprayed and supplied into the main reservoir 10 through the fluid supply line 30.

Then, the water level of the cryogenic fluid supplied to the main storage tank 10 gradually rises, and the vaporized gases pass through the inlet hole 21 of the auxiliary storage tank 20 and the through hole 42 of the opening and closing port 40. It is introduced into the auxiliary storage tank 20 through.

Subsequently, when the level of the cryogenic fluid supplied is continuously raised in contact with the buoyancy plate 45 of the opening and closing hole 40, the buoyancy plate 45 is raised and the lower end of the distribution pipe 41 of the opening and closing hole 40. It is in contact with the through-hole 42 to close and through the through-hole 42 of the opening and closing 40 so that the cryogenic fluid does not flow into the auxiliary storage tank (20).

When the cryogenic fluid is filled in the main storage tank 10, the cryogenic fluid having the height of the inner wall 11 of the main storage tank 10 and the upper side of the auxiliary storage tank 20 is separated from the inflow hole ( 21 is introduced into the auxiliary storage tank (20).

Therefore, even when the main storage tank 10 is filled with the cryogenic fluid, the space of the inner wall 11 of the main storage tank 10 and the space above the auxiliary storage tank 20 is separated by the height and the auxiliary storage tank 20. Since the remaining space of) is always maintained, it provides a space for the vaporized gas to enter.

Then, when looking at the discharge of the cryogenic fluid and vaporized gas stored in the cryogenic container, vaporization of the upper and lower inside the main reservoir 10 through the gas discharge pipe 51 and the fluid discharge pipe 52 of the discharge line 50 Gas and cryogenic fluid to the outside.

At this time, the gas of the auxiliary storage tank 20 is first discharged through the inlet hole 21, the level of the cryogenic fluid of the main storage tank 10 is lower than the buoyancy plate 45 of the opening and closing port 40 When lowered, the through-hole 42 of the opening and closing port 40 is opened, and the cryogenic fluid and vaporized gas stored in the auxiliary storage tank 20 are completely discharged to the discharge line 50.

As described above, the cryogenic container has a space equal to a spaced height between the upper side of the inner wall 11 of the main storage tank 10 and the upper side of the auxiliary storage tank 20 even though the cryogenic fluid is filled in the main storage tank 10. Since the remaining space of the auxiliary storage tank 20 is always maintained, it provides a space in which vaporized gas can be introduced, thereby preventing a risk of damage due to internal pressure rise even if a part of the cryogenic fluid is vaporized and converted into gas.

Figure 6 is an enlarged cross-sectional view showing another embodiment of the line coupling portion and the fluid supply line and the discharge line of the components of the cryogenic container according to an embodiment of the present invention.

As shown in Figure 6, the line coupling portion may be configured differently the fluid supply line, the discharge line and the coupling cover.

That is, the main storage tank from the outside in a state in which the inlet hole 172 and the pair of outlet holes 173a and 173b which are connected to the fluid supply line 130, the gas discharge pipe 151, and the fluid discharge pipe 152 are formed. Located between the inner wall 11 and the outer wall 12 of the main reservoir 10 in a state of being coupled to the coupling body 171 through the outer wall 12 of the (10) and the one end of the coupling body 171 A plurality of through holes 175 are formed at one side thereof and include an outer wall connection pipe 174 into which the fluid supply line 130, the gas discharge pipe 151, and the fluid discharge pipe 152 are inserted. The assembly 171 and the outer wall connection pipe 174 is coupled by welding.

In addition, the fluid supply line 130, the gas discharge pipe 151, and the fluid discharge pipe 152, which are built into the outer wall connection pipe 174, are all twisted by 360 ° is installed after twisting. That is, the fluid supply line 130, the gas discharge pipe 151, and the fluid discharge pipe 152 is installed in an intertwined twisted state. By doing so, the total length is longer than that of the conventional straight type, which reduces the heat loss, thereby improving the heat insulation performance of the entire container, and also by twisting 360 °, which is the strain of the line itself, resulting in rupture caused by vibration. Will reduce the risk.

In addition, the line coupling portion 170 has an inner wall connecting pipe 176 which is surrounded by the outer wall connecting pipe 174 with one end penetrated into the inner wall 11 in the interior of the main reservoir 10, Coupling cover through which the fluid supply line 130 and the discharge line 50 pass in a state in which one end of the outer wall connection pipe 174 and the inner wall connection pipe 176 introduced into the main reservoir 10 are hermetically coupled. (177).

The coupling cover 177 is not integral, but consists of three separate caps. That is, the coupling cover 177 is a small cap 177a for sealing one end of the outer wall connection pipe 174, a medium type for sealing one end between the outer wall connection pipe 174 and the inner wall connection pipe 176. Cap 177b, and a large cap 177c for supporting one end of the inner wall connection pipe 176. The diameter of the small cap 177a is smaller than the medium cap 177b, and the diameter of the medium cap 177b is smaller than the large cap 177c.

As such, after the coupling cover 177 is composed of three separate caps, welding is performed at the rear portions of the respective caps, thereby reducing the stress during vibration, thereby preventing the welding site from being easily ruptured. .

At this time, the inner wall connecting pipe 176 and the outer wall connecting pipe 174 and the inside of the outer wall connecting pipe 174 is in communication with the vacuum space between the inner wall 11 and the outer wall 12 of the main storage unit 10; It becomes a vacuum state, such as between the inner wall 11 and the outer wall 12 of the main storage unit 10 can block the heat transfer to the inside of the main storage unit 10 from the outside.

In addition, the inner wall connecting pipe 176 and the outer wall connecting pipe 174 and the inside of the outer wall connecting pipe 174 may be filled with a heat insulating material to increase the heat transfer effect of the outside.

That is, the twisted fluid supply line 130, the gas discharge pipe 151 and the fluid discharge pipe 152 penetrates through the coupling cover 177 of the line coupling portion 170 into the outer wall connection pipe 174 In the retracted state, the inlet hole 172 and the pair of outlet holes 173a and 173b of the assembly 171 are respectively connected to block heat transfer from the outside into the main reservoir 10.

In the cryogenic container of the present invention as described above, even if the cryogenic fluid is filled in the main reservoir, the space of the inner wall of the main reservoir and the upper space of the secondary reservoir and the inner remaining space of the auxiliary reservoir are always maintained. It provides a space for the gas to be introduced, so that even if a part of the cryogenic fluid is vaporized and converted into gas, it provides an effect of preventing the risk of damage due to impact due to an internal pressure increase.

In addition, by processing the fluid supply line and the discharge line by twisting 360 °, the overall length of the line is extended to reduce heat loss, thereby improving the thermal insulation performance of the container, and greatly reduces the risk of rupture due to the strain of the line itself during the vibration test. It is an object of the present invention to provide an ultra low temperature container of natural gas for a vehicle.

As mentioned above, although this invention was demonstrated by the limited embodiment and drawing, this invention is not limited by this, The person of ordinary skill in the art to which this invention belongs, Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

Claims (12)

A main storage tank for storing the cryogenic fluid therein with a vacuum space formed between the inner wall and the outer wall; An auxiliary storage tank installed adjacent to an upper side of an inner wall of the main storage tank in an inlet hole formed at an upper side thereof; A fluid supply line penetrating into the main reservoir from the outside and supplying cryogenic fluid to the main reservoir; An opening and closing mechanism for allowing the cryogenic fluid and the vaporized gas to be discharged into the auxiliary storage tank while being opened and closed by buoyancy according to the level of the cryogenic fluid supplied from the fluid supply line in a state of being penetrated through the lower one side of the auxiliary storage tank; A discharge line penetrating into the main reservoir from the outside to discharge the cryogenic fluid and vaporized gas stored in the main reservoir to the outside; And, And a line coupling part penetratingly coupled to the main reservoir to block heat transfer from the outside into the main reservoir in a state of integrally surrounding a portion passing through the inner portion of the main reservoir of the fluid supply line and the discharge line. Cryogenic container of natural gas for vehicles. The method of claim 1, Cryogenic vessel of the natural gas for a vehicle, characterized in that the level gauge is further installed to determine the level of the cryogenic fluid flowing into the main reservoir. The method of claim 1, One end of the fluid supply line is a cryogenic container of the natural gas for a vehicle, characterized in that installed adjacent to the upper side of the inner wall of the main reservoir in a vertical state. The method according to claim 1 or 3, One end of the fluid supply line is a cryogenic container of a natural gas for a vehicle, characterized in that the injection nozzle for spraying and supplying the cryogenic fluid in the spray state into the main reservoir. The method of claim 1, The opening and closing is A through pipe having a stepped through hole vertically coupled to one side of the lower side of the auxiliary storage tank in a longitudinal direction; A flow shaft inserted into the through hole of the distribution pipe in a state in which a fixed plate and a buoyancy plate are coupled to an upper end and a lower end, respectively; Cryogenic vessel of the natural gas for a vehicle, characterized in that it comprises an elastic body extrapolated to the flow shaft in the state introduced into the through-hole of the distribution pipe. The method of claim 5, The cryogenic container of the natural gas for a vehicle, characterized in that the elastic body is a spring. The method of claim 1, The opening and closing is A through-hole provided with a stepped length in a longitudinal direction, and having a through-hole communicating with the inside of the sub-storage and communicating with the through-hole perpendicularly to the lower side of the sub-storage; Cryogenic container of a natural gas for a vehicle, characterized in that it comprises a flow shaft which is inserted into the through-holes of the distribution pipe in a state in which the buoyancy plate formed with a fixed plate and a locking portion, respectively, the upper end and the lower end. The method of claim 1, The discharge line is A gas discharge pipe having one end bent adjacent to the upper side of the inner wall of the main storage tank in a vertical state to discharge the vaporized gas to the outside; And a fluid discharge pipe having one end bent in a vertical state adjacent to a bottom side of the inner wall of the main reservoir to discharge the cryogenic fluid to the outside. The method of claim 1, The line coupling portion A combination penetratingly coupled to the outer wall of the main storage tank from the outside in a state where an inlet hole and an outlet hole connected to the fluid supply line and the discharge line are formed; A plurality of through-holes are formed at one side between the inner wall and the outer wall of the main storage tank in a state of being coupled to one end of the assembly, and an outer wall connection pipe into which the fluid supply line and the discharge line are inserted; An inner wall connecting pipe having one end penetrated into an inner wall of the main reservoir in a state surrounding the outer wall connecting pipe; And a coupling cover through which the fluid supply line and the discharge line pass in a state in which one end of the outer wall connection pipe and the inner wall connection pipe introduced into the main reservoir are hermetically coupled to each other. The method of claim 9, The inner wall connection pipe and the outer wall connection pipe and the inside of the outer wall connection pipe is in communication with the vacuum space between the inner wall and the outer wall of the main storage part, so that the vacuum state such as between the inner wall and the outer wall of the main storage part is maintained. Cryogenic container of natural gas. The method of claim 1, The line coupling portion A combination penetratingly coupled to the outer wall of the main storage tank from the outside in a state where an inlet hole and an outlet hole connected to the fluid supply line and the discharge line are formed; A plurality of through-holes are formed at one side between the inner wall and the outer wall of the main storage tank in a state of being coupled to one end of the assembly, and an outer wall connection pipe into which the fluid supply line and the discharge line are inserted; An inner wall connecting pipe having one end penetrated into an inner wall of the main reservoir in a state surrounding the outer wall connecting pipe; A coupling cover through which the fluid supply line and the discharge line pass in a state in which one end of the outer wall connection pipe and the inner wall connection pipe introduced into the main reservoir are sealed. The coupling cover seals one end of the outer wall connection pipe 174. Small cap (177a), a medium cap (177b) for sealing one end between the outer wall connecting pipe 174 and the inner wall connecting pipe 176, and for supporting one end of the inner wall connecting pipe (176) Cryogenic container of a natural gas for a vehicle comprising a; a coupling cover having a large cap (177c). The method of claim 11, The fluid supply line and the discharge line embedded in the line coupling portion are all twisted by 360 °, the cryogenic container of the natural gas for a vehicle, characterized in that installed after being twisted.

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