Receptacles – Closures – With condition responsive vent or valve
Patent
1995-08-09
1997-11-11
Cronin, Stephen
Receptacles
Closures
With condition responsive vent or valve
22020301, 220264, 220326, 220335, 220 891, B65D 5116
Patent
active
056854480
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed towards an apparatus for compensation or equalization of pressure surges in the course of possible dust, dirt or gas explosions in closed systems, such as silos, pipelines or the like with a hinged cover or lid in lightweight construction pivotable around a pivot axis at an outlet stub.
2. Summary of the Invention
In order to divert pressure surges in containers through pipelines prior to their striking for instance downstream elements such as filters or the like, so-called explosion protection covers or lids are known, as for instance from the DE-A-24 55 325, the DE-A-30 42 026 or the DE-A 31 06 138. This lastly mentioned explosion protection lid in lightweight construction has given a good account of its self in actual practice, especially the system for damping of the lid when it opens as intended. A refinement of the damping system is shown in the DE-A-36 26 946.
It was seen that in particular in pipelines due to the extremely high propagation velocity of pressure surges or waves, which can normally only propagate in one direction in pipelines, the lastly mentioned arrangement can still be improved, in particular as far as the design of the hinged lid itself is concerned.
It is a task of the invention to design such a hinged cover or lid in an even more lightweight manner, so that it can be moved by the pressure surge in particular at an even higher velocity without being destroyed in the open position.
SUMMARY OF THE INVENTION
This task is solved by the invention in an arrangement of the previously described type in that the hinged lid is configured at least partially as a hollow member.
The design as partial hollow member entails a large number of advantages. Thus thinner sheet metal plates can overall be used for the construction of the lid, the cavity can be used for additional purposes as this is described further below and more of the like.
It is provided in the design that the hinged lid or cover has a planar outer surface, wherein the surface of the hinged lid pointing towards the inside of the stub and located opposite the inner-and outer-surface is configured in an arched or domed manner.
This design provides additional considerable advantages, as tests have shown, namely that the impacting pressure surge does not hit a planar surface, rather an arched or domed one, which on the one hand results in an improved initiation of the opening forces and on the other hand to a better diversion of the gases striking in an explosion-like manner.
Thus the cavity of the hinged lid or cover can be foamed out with insulation foam material, the lid can additionally be equipped with a hinge bracket and/or with a heating device or more of the like.
It can also be provided in the invention, to thermally separate the internal and external surface of the hinged cover, for instance to rivet or bond said surfaces against one another with interposition of a plastics insulation ring. This is expedient especially if formation of condensation water is to be avoided. It is also advantageous to equip the apparatus in the invention with damping elements for the opening hinged cover, such as spring element, which supports the flexural disk or plate of the lid.
According to the invention it is also provided that the recovery dish be equipped with a clamping spring lock for fixation of the swiveled out lid or cover in the open state, in order to prevent the lid from swiveling back in an uncontrolled manner. It is also achieved in case of an explosion, by the fixation or fastening in the open position that this disturbance can be optically determined from the outside due to the open and kept open lid.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following the invention is described with particularity with the help of examples shown on the drawing, which show on:
FIG. 1. a side view of the arrangement partially in section,
FIG. 2. plan view along arrow II in FIG. 1 as well on
FIGS. 3a. to 3c. a portion of the valve in the invention with a part
REFERENCES:
patent: 876000 (1908-01-01), Hyatt
patent: 934792 (1909-09-01), Card
patent: 1312892 (1919-08-01), Cashen
patent: 1629747 (1927-05-01), Stathes et al.
patent: 1930841 (1933-10-01), Miniere
patent: 2105735 (1938-01-01), Hodge
patent: 2729416 (1956-01-01), Waas
patent: 3334770 (1967-08-01), Stanback
patent: 3788514 (1974-01-01), Giacoma, Jr. et al.
Silo-Thorwesten, Air-cushioned explosion doors, brochure published Jul. 1994.
Photograph of a "Light-construction explosion hinged lid", in closed position of the drain-pipe socket, nozzle, stub connection date unknown.
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