# US 8,998,024 B2 · Device for storing low-molecular gases

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- Number: US 8,998,024 B2
- Document ID: US8998024B2
- Status: Granted
- Kind: B2
- Application number: 13/814,307
- Filed: 2011-07-26
- Published: 2013-07-11
- Granted: 2015-04-07
- Earliest claimed: 2010-08-06
- Assignees: Daimler AG
- Applicants: Jens Franzen; Gerardo Friedlmeier; Kai Kioschis; Detlef Zur Megede
- Inventors: Jens Franzen; Gerardo Friedlmeier; Kai Kioschis; Detlef Zur Megede
- Web page: https://patentgrep.com/patent/US8998024B2

## CPC

- F16K 15/021: {the valve member being a movable body around which the medium flows when the valve is open (F16K15/025 - F16K15/12 take precedence)}
- F17C 1/16: constructed of plastics materials {(shaping of plastics B29C)}
- F17C 2201/0109: with exteriorly curved end-piece
- F17C 2201/056: Small (<1 m3)
- F17C 2203/0604: Liners
- F17C 2203/0619: with two layers
- F17C 2203/066: Plastics
- F17C 2203/0663: in form of fibers or filaments
- F17C 2205/0335: Check-valves or non-return valves
- F17C 2205/0391: inside the pressure vessel
- F17C 2205/0397: on both sides of the pressure vessel
- F17C 2221/012: Hydrogen
- F17C 2223/0123: gaseous, e.g. CNG, GNC
- F17C 2223/036: Very high pressure (>80 bar)
- F17C 2260/037: Handling leaked fluid
- F17C 2270/0168: by vehicles
- F17C 2270/0184: Fuel cells
- Y02E 60/32: Hydrogen storage
- Y10T 137/3149: Back flow prevention by vacuum breaking [e.g., anti-siphon devices]
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}
- F17C: VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES (storing fluids in natural or artificial cavities or chambers in the earth B65G5/00; construction or assembling of bulk storage containers employing civil-engineering techniques E04H7/00; variable-capacity gas-holders F17B; liquefaction or refrigeration machines, plants, or systems F25)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A device that stores a low molecular gas, such as hydrogen (H2), under high pressure includes having an inner shell and at least one outer sleeve surrounding the inner shell. The region between the inner shell and the outer sleeve is connected via at least one valve with a backflow prevention capability to the region surrounded by the inner shell. The valve is thereby formed so that low molecular gas which has diffused through the inner shell can flow back into the inner shell when there are suitable pressure conditions.

## Claims

### Claim 1

A device for storing low molecular gases under high pressure, the device comprising:
an enclosed inner shell;
at least one enclosed outer sleeve having an inner side surrounding the inner shell and an outer side exposed to an environment outside of the device;
a connection element having a first side exposed to the environment outside of the device and a second side exposed to an inside of the enclosed inner shell, wherein the connection element is configured to allow filling and removing the low molecular gas from the inside of the enclosed inner shell;
a backflow prevention valve arranged in the connection element in a region between the enclosed inner shell and enclosed outer sleeve so that it connects the region between the enclosed inner shell and enclosed outer sleeve to the inside of the enclosed inner shell in such a way that low molecular gas that diffused through the enclosed inner shell flows back into the enclosed inner shell under certain pressure conditions.

### Claim 2 (depends on 1)

The device according to claim 1, wherein the valve is pre-tensioned via a spring in a closed state of the valve.

### Claim 3 (depends on 1)

The device according to claim 1, wherein the valve is a non-return valve.

### Claim 4 (depends on 1)

The device according to claim 1, wherein the enclosed inner shell is plastic.

### Claim 5 (depends on 1)

The device according to claim 1, wherein the at least one enclosed outer sleeve is composed of a fiber-reinforced material.

### Claim 6 (depends on 1)

The device according to claim 1, wherein the low molecular gas is hydrogen.

### Claim 7 (depends on 1)

The device according to claim 1, wherein the device is configured to store the low molecular gas at a pressure of more than 350 bar.

### Claim 8 (depends on 1)

The device according to claim 1, wherein the low molecular gas is fuel for a vehicle.

### Claim 9 (depends on 8)

The device according to claim 8, wherein the vehicle is a fuel cell vehicle.