GAS CYLINDER, IN PARTICULAR HIGH-PRESSURE GAS CYLINDER

• US 20140230645A1
• Filed: 10/31/2012
• Published: 08/21/2014
• Est. Priority Date: 11/14/2011
• Status: Active Grant

• Current Assignee: Hydac Technology Gmbh (HYDAC International GmbH)
• Original Assignee: Hydac Technology Gmbh (HYDAC International GmbH)
• Inventors: Bauer, Frank, Feld, Daniel
• Granted Patent: US 10,451,137 B2
• Time in Patent Office: Days
• US Class Current: 92/109
• CPC Class Codes: F15B 1/24 with rigid separating means, e.g. pistons
• CPC Class Codes: F15B 15/1461 Piston rod sealings
• CPC Class Codes: F16F 9/0209 Telescopic F16F9/04 takes precedence
• CPC Class Codes: F16F 9/0236 characterised by having a hollow piston rod
• CPC Class Codes: F16F 9/3278 for lubrication lubricating per se F16N
• CPC Class Codes: F16F 9/362 Combination of sealing and guide arrangements for piston rods F16F9/361, F16F9/365 take precedence
• CPC Class Codes: F16F 9/365 the sealing arrangement having a pressurised chamber separated from the damping medium
• CPC Class Codes: F16J 15/40 by means of fluid
• CPC Class Codes: F16J 15/46 with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings connection of valves to inflatable elastic bodies B60C29/00; for sealing arrangements in vehicles B60J10/244; for sealing arrangements of openings in buildings E06B7/2318; for tube connections F16L

Abstract

The invention relates to a gas cylinder, in particular a high-pressure gas cylinder, the cylinder tube (1) of which has a piston rod (9) that is passed through a sealing arrangement (13) by which the gas pressure prevailing in the pressure chamber (23) of the cylinder tube (1) is sealed off against the ambient pressure. The invention is characterised in that the scaling arrangement (13) has a compressed oil chamber (33) between at least one sealing element (31) adjacent to the pressure chamber (23) and at least one more sealing element further away from the pressure chamber (23), into which oil chamber oil can be pressed in by means of a supply device (51) at a pressure that is equal to or higher than the respective gas pressure prevailing in the pressure chamber (23) of the cylinder tube (1).

Claims

1. A gas cylinder, in particular high-pressure gas cylinder, the cylinder tube of which (1) has a piston rod (9) that is passed through a sealing arrangement (13), which seals the gas pressure prevailing in the pressure chamber (17, 23) of the cylinder tube (1) against the ambient pressure, characterized in that the sealing arrangement (13) has a pressurized oil chamber (33) between at least one sealing element (31) adjacent to the pressure chamber (17, 23) and at least one additional sealing element (35) further away from the pressure chamber (17, 23), into which compressed oil can be compressed by means of a supply device (37, 51) at a pressure that is equal to or higher than the respective gas pressure prevailing in the pressure chamber (17, 23) of the cylinder tube (1).

2. The gas cylinder according to claim 1, characterized in that the piston rod (9) has a movable sliding element (19) in the cylinder tube (1).

3. The gas cylinder according to claim 1, characterized in that the sealing elements (31, 35) of the sealing arrangement (13) and the pressurized oil chamber (33) located between these sealing elements are disposed in a fixed positional relationship to one another.

4. The gas cylinder according to claim 1, characterized in that the supply device has a hydraulic accumulator (37;

51), the oil side (39) of which, which contains sealing oil, can be connected to the pressurized oil chamber (33) and the gas side (43) of which can be connected to the pressure chamber (17, 23) of the cylinder tube (1).

5. The gas cylinder according to claim 1, characterized in that the supply device has an oil connection (47), by means of which the sealing oil for the oil side (39) of the hydraulic accumulator (37, 51) can be refilled.

6. The gas cylinder according to claim 1, characterized in that the supply device has a device (63;

67, 69) for monitoring the quantity of sealing oil.

7. The gas cylinder according to claim 1, characterized in that the monitoring device has at least one pressure sensor (67, 69).

8. The gas cylinder according to claim 1, characterized in that the hydraulic accumulator of the supply device is designed in the form of a piston accumulator (51).

9. The gas cylinder according to claim 1, characterized in that the piston (55;

61) of the piston accumulator (51) is mechanically preloaded for movement towards the oil side (39).

10. The gas cylinder according to claim 1, characterized in that the piston accumulator (51) in the end piece (7) of the cylinder tube (1) containing the sealing arrangement (13) is integrated in such a way that the gas side (43) of the accumulator cylinder (53;

59) is open to the pressure chamber (17, 23) of the cylinder tube (1).

11. The gas cylinder according to claim 1, characterized in that the accumulator cylinder is formed in the end piece (7) by an annular space (59) adjacent to the pressure chamber (17, 23), said annular space enclosing the piston rod (9) and containing an annular piston (61).

12. The gas cylinder according to claim 1, characterized in that a hollow piston rod (9) is provided in the form of a straight length of tubing, the inner end (15) of which is open to the pressure chamber (17) of the cylinder tube (1).

13. The gas cylinder according to claim 1, characterized in that the sliding element at the end (15) of the piston rod (9) has a piston-like guide component (19).

14. The gas cylinder according to claim 1, characterized in that the guide component (19) is formed such that it is non-circular, and is guided along the wall of the cylinder tube (1) at corner regions (71) by means of sliding guides (73;

75).

15. The gas according to claim 1, characterized in that the force-stroke characteristic of the gas cylinder can be adjusted by means of the selection of the outer and inner diameter of the piston rod (9) and the inner diameter of the cylinder tube (1).