Safety device against excess temperature

Patent metadata

Field	Value
Publication number	US-10000318-B2
Application number	US-201113261433-A
Country	US
Kind code	B2
Filing date	Feb 26, 2011
Priority date	Mar 18, 2010
Publication date	Jun 19, 2018
Grant date	Jun 19, 2018

Abstract

A safety apparatus is for containers loaded by gas pressure, in particular the gas side ( 13 ) of hydropneumatic devices such as hydraulic accumulators ( 1 ). The safety apparatus has a connection device ( 19 ) that can be attached to the pressure chamber of the container to form a passage ( 25 ) between the gas side ( 13 ) of the container and the outside. A structure ( 27 ) normally blocks the passage ( 25 ) and under the influence of temperature can be transferred into a state that allows a flow path through the passage ( 25 ) to be cleared.

First claim

What is claimed is:

1. A safety device for containers loaded by gas pressure, comprising:
a connecting device attachable to a pressure chamber of a container;
a passage extending in said connecting device connecting the pressure chamber to an outside of the container;
unmelted solder located directly in said passage and forming a sealing plug that melts due to a temperature increase and that blocks fluid communication between the pressure chamber and the outside of the container;
a sealing cap on an end region of said passage forming a spring housing;
a spring held in a tensioned state in said sealing cap by said unmelted solder;
a control element movable axially in said passage by a spring force of said spring upon melting of said solder, said control element having a mandrel; and
a rupturable disk in said passage normally blocking fluid flow through said passage, said mandrel being axially movable with said control element upon melting of said solder to piece said rupturable disk unblocking said passage for fluid flow between the pressure chamber and the outside of the container.

2. A safety device according to claim 1 wherein
said solder is made of an alloy having a desired melting point.

3. A safety device according to claim 1 wherein
said passage extends axially from an end of said connecting device bordering the gas chamber to said end region.

4. A safety device according to claim 3 wherein
said passage widens in an axial position thereof spaced from said rupturable disk.

5. A safety device according to claim 4 wherein
said spring, said solder and said control element are axially aligned in said axial section.

6. A safety device according to claim 5 wherein
said control element is coaxially between said unmelted solder and said spring.

7. A safety device according to claim 6 wherein
said mandrel extends axially through a central opening in said unmelted solder that is ring-shaped.

8. A safety device according to claim 7 wherein
said control element comprises through openings spaced radially outwardly of said mandrel.

9. A safety device according to claim 8 wherein
said sealing cap has a vent opening therein.

10. A safety device according to claim 3 wherein
said connecting device is connected to said sealing cap, said end cap having an axial section of said passage in said sealing cap spaced from said rupturable disk.

11. A safety device according to claim 10 wherein
said spring, said solder and said control element are axially aligned in said axial section.

12. A safety device according to claim 11 wherein
said control element is coaxially between said unmelted solder and said spring.

13. A safety device according to claim 12 wherein
said mandrel extends axially through a central opening in said unmelted solder that is ring-shaped.

14. A safety device according to claim 13 wherein
said control element comprises through openings spaced radially outwardly of said mandrel.

15. A safety device according to claim 14 wherein
said sealing cap has a vent opening therein.

16. A safety device according to claim 1 wherein
said connecting device extends through an opening in a housing of the pressure chamber.

Assignees

• Groben Martin
• Hydac Technology Gmbh

Inventors

• Groben Martin

Classifications

• F15B1/083 Primary

  the accumulator having a fusible plug · CPC title

• F17C2205/0394

  in direct contact with the pressure vessel · CPC title

• F17C2201/0119

  with flat end-piece · CPC title

• F17C2221/014

  Nitrogen · CPC title

• F17C2223/036

  Very high pressure (>80 bar) · CPC title