Cryogenic Pressure Container

Abstract

A cryogenic pressure container for a motor vehicle has an inner container and an outer container. An evacuated space is arranged between the inner container and the outer container at least in some regions. The inner container has a synthetic material layer. A barrier layer is arranged at least in some regions between the synthetic material layer and the evacuated space. The barrier layer is designed and arranged so as to at least reduce the transfer of constituents leaking out of the synthetic material layer into the evacuated space, wherein a gap is formed at least in some regions between the barrier layer and the synthetic material layer.

Claims

1. A cryogenic pressure container for a motor vehicle, comprising: an inner container having a synthetic material layer; an outer container; an evacuated space provided, at least in certain regions, between the inner container and the outer container; a barrier layer arranged, at least in certain regions, between the synthetic material layer and the evacuated space; a gap formed at least in certain regions between the barrier layer and the synthetic material layer, wherein the barrier layer is formed and arranged so as to at least reduce a transition of constituents escaping from the synthetic material layer into the evacuated space.

2. The pressure container as claimed in claim 1, wherein the synthetic material layer is a fiber-reinforced synthetic laminate which surrounds a liner.

3. The pressure container as claimed in claim 2, wherein the barrier layer separates the fiber-reinforced synthetic laminate from the evacuated space in an essentially gas-tight manner.

4. The pressure container as claimed in claim 1, wherein the barrier layer has an outgassing-free material facing the evacuated space.

5. The pressure container as claimed in claim 2, wherein the barrier layer has an outgassing-free material facing the evacuated space.

6. The pressure container as claimed in claim 1, wherein the barrier layer is made of a metal.

7. The pressure container as claimed in claim 3, wherein the barrier layer is made of a metal.

8. The pressure container as claimed in claim 1, wherein the gap forms a gas-tight space, and the pressure container is formed such that a composition of gas in the gas-tight space is evaluatable from outside the pressure container.

9. The pressure container as claimed in claim 8, wherein the gas-tight space comprises at least one testing connection, and the testing connection leads out of the outer container.

10. The pressure container as claimed in claim 1, wherein the gas-tight space comprises at least one testing connection, and the testing connection leads out of the outer container.

11. The pressure container as claimed in claim 1, further comprising at least one radiation insulation arranged outside the barrier layer.

12. The pressure container as claimed in claim 3, further comprising at least one radiation insulation arranged outside the barrier layer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is a schematic cross section view of a cryogenic pressure container 40.

[0019] FIG. 1A is an enlarged view of detail A in FIG. 1.

[0020] FIG. 2 is another schematic cross section view of the pressure container 40.

DETAILED DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 shows a cryogenic pressure container 40 which, in this case, is attached to the vehicle body (not shown) by two mounts 50. The pressure container 40 has an inner container 10 and an outer container 30. The inner container 10 is arranged inside the outer container 30. An evacuated space V is arranged between the inner container 10 and the outer container 30. The two ends of the inner container 10 connect the latter to the outer container 30.

[0022] FIG. 1A is an enlarged view of the structure of the inner container 10. The barrier layer 16, which in this case surrounds the fiber-reinforced synthetic laminate 14 entirely and in a leak-tight manner, is arranged radially outward. It can also be provided that only one part, for example the cylindrical region, of the liner 12 is surrounded by the synthetic laminate 14. It would then also be sufficient for only this region to be surrounded by the barrier layer 16. The synthetic laminate 14 surrounds the liner 12, which in this case takes the form of an aluminum liner 12. For example, this laminate layer 14 can have been applied using a winding method. The barrier layer 16 prevents any inclusions or locally present constituents with a disadvantageous vapor pressure curve, which may be present in the synthetic laminate 14, from passing into the evacuated space V. This makes it possible to create a cryogenic pressure container 40 with a relatively large fluid storage volume and relatively good long-term heat insulation.

[0023] FIG. 2 shows a similar pressure container 40 to that in FIGS. 1 and 1A. Therefore, only the differences and additions are set out below. One difference with respect to the first example is that here a gap is formed between the barrier layer 16 and the synthetic material layer 14. This gap can extend over the entire circumferential or jacket region of the inner container 10, and project into the side regions of the inner container 30. Here, the gap forms a gas-tight space R. Gases, which for example have diffused out of the synthetic material layer 14, can collect in the space R. Expediently, the pressure container 40 is formed such that the gas composition in the gas-tight space R can be evaluated from the outside. To that end, sensors installed in the space R could be used. Particularly preferably, the gas-tight space R includes at least one testing connection R.sub.A which further leads out of the outer container 30. This makes it easy to monitor the outgassing. Alternatively or in addition, this testing connection can be used to evacuate the gas-tight space R, at least to a certain degree. It then serves as an evacuation connection. At least one radiation insulation 18 can be arranged outside the barrier layer 16. A synthetic liner 12 can, for example, be used here as the liner 12.

[0024] The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.