Transport container with coolable thermal shield
The invention relates to a transport container ( 1 ) for helium (He), comprising an inner container ( 6 ) for receiving the helium (He); a coolant container ( 14 ) for receiving a cryogenic fluid (N 2 ); an outer container ( 2 ) in which the inner container ( 6 ) and the coolant container ( 14 ) are received; a thermal shield ( 21 ) in which the inner container ( 6 ) is received and which can be actively cooled using the cryogenic fluid (N 2 ), said thermal shield ( 21 ) having at least one cooling line ( 26 ) which is fluidically connected to the coolant container ( 14 ) and in which the cryogenic fluid (N 2 ) can be received in order to actively cool the thermal shield ( 21 ); and at least one return line ( 34, 35 ), by means of which the at least one cooling line ( 26 ) is fluidically connected to the coolant container ( 14 ) in order to return the cryogenic fluid (N 2 ) back to the coolant container ( 14 ).
1. A transport container ( 1 ) for helium (He) comprising:
an inner container ( 6 ) for receiving the helium (He), a coolant container ( 14 ) for receiving a cryogenic fluid (N 2 ), an outer container ( 2 ) in which the inner container ( 6 ) and the coolant container ( 14 ) are received, and a thermal shield ( 21 ) in which the inner container ( 6 ) is received and which can be actively cooled using the cryogenic fluid (N 2 ),
said thermal shield ( 21 ) having at least one cooling line ( 26 ), which is fluidically connected to the coolant container ( 14 ) and in which the cryogenic fluid (N 2 ) can be received in order to actively cool the thermal shield ( 21 ), and at least one return line ( 34 , 35 ), by means of which the at least one cooling line ( 26 ) is fluidically connected to the coolant container ( 14 ) in order to return the cryogenic fluid (N 2 ) back to the coolant container ( 14 ),
wherein an inside diameter (d 34 , d 35 ) of the at least one return line ( 34 , 35 ) is larger than an outside diameter (d 26 ) of the at least one cooling line ( 26 ).
2. The transport container according to claim 1 , wherein the at least one cooling line ( 26 ) is fluidically connected to a liquid zone ( 19 ) of the coolant container ( 14 ), and wherein the at least one return line ( 34 , 35 ) is fluidically connected to a gas zone ( 18 ) of the coolant container ( 14 ).
3. The transport container according to claim 1 , wherein the at least one return line ( 34 , 35 ) opens into the coolant container ( 14 ) above, with respect to a direction of gravity (g), the at least one cooling line ( 26 ).
4. The transport container according to claim 1 , wherein a lowest point of the at least one cooling line ( 26 ) is fluidically connected to the coolant container ( 14 ).
5. The transport container according to claim 1 , wherein a highest point of the at least one cooling line ( 26 ) is fluidically connected to the coolant container ( 14 ) with the aid of the at least one return line ( 34 , 35 ).
6. The transport container according to claim 1 , wherein the inside diameter (d 26 ) of the at least one cooling line ( 26 ) is larger than 10 millimeters.
7. The transport container according to claim 1 , wherein the at least one return line ( 34 , 35 ) is inclined in the direction of the coolant container ( 14 ) at an angle of inclination (β).
8. The transport container according to claim 1 , wherein the at least one return line ( 34 , 35 ) is connected to the thermal shield ( 21 ) and arranged between the thermal shield ( 21 ) and the outer container ( 2 ).
9. The transport container according to claim 1 , wherein, during operation of the transport container ( 1 ), the cryogenic fluid (N 2 ) boils to actively cool the thermal shield ( 21 ) in the at least one cooling line ( 26 ), so that gas bubbles, arising in the at least one cooling line ( 26 ), of a gaseous phase (GN 2 ) of the cryogenic fluid (N 2 ) convey a liquid phase (LN 2 ) of the cryogenic fluid (N 2 ) into the at least one return line ( 34 , 35 ), so as to return the gaseous phase (GN 2 ) of the cryogenic fluid (N 2 ) and/or the liquid phase (LN 2 ) of the cryogenic fluid (N 2 ) back to the coolant container ( 14 ).
10. The transport container according to claim 1 , wherein a first return line ( 34 ) and a second return line ( 35 ) are provided which run parallel to one another.
11. The transport container according to claim 1 , wherein the coolant container ( 14 ) has a bleed valve ( 36 ) for bleeding off a gaseous phase (GN 2 ) of the cryogenic fluid (N 2 ) from the coolant container ( 14 ).
12. The transport container according to claim 1 , wherein the inner container ( 6 ) is completely surrounded by the thermal shield ( 21 ).
13. The transport container according to claim 12 , wherein the thermal shield ( 21 ) has a cover section ( 24 ) which is separate from the coolant container ( 14 ) and is arranged between the inner container ( 6 ) and the coolant container ( 14 ).
14. The transport container according to claim 1 , wherein the coolant container ( 14 ) is arranged outside the thermal shield ( 21 ).
15. The transport container according to claim 1 , wherein an intermediate space ( 12 ) is provided between the outer container ( 2 ) and the inner container ( 6 ) and between the outer container ( 2 ) and the coolant container ( 14 ).
16. The transport container according to claim 1 , wherein the thermal shield ( 21 ) is fluid-permeable and a gap ( 25 ) is provided between the inner container ( 6 ) and the thermal shield ( 21 ), and said gap ( 25 ) is fluidically connected to the intermediate space ( 12 ).
17. The transport container according to claim 1 , wherein the at least one cooling line ( 26 ) comprises two perpendicular sections ( 27 , 28 ), extending in a direction of gravity (g), and two oblique sections ( 29 , 30 ).
18. The transport container according to claim 1 , wherein two oblique sections ( 29 , 30 ) have an angle of inclination α of 3° to 15° relative to a horizontal.
19. The transport container according to claim 1 , wherein the at least one return line ( 34 , 35 ) is inclined at an angle of inclination β of 4° to 15° relative to a horizontal.
20. The transport container according to claim 10 , wherein the first return line ( 34 ) and the second return line ( 35 ) are inclined at an angle of inclination β of 4° to 15° relative to a horizontal.