DE313893C

DE313893C -

Info

Publication number: DE313893C
Application number: DENDAT313893D
Authority: DE

Description

Bei den aus schlecht wärmeleitendem, sprödem i(keramischem) Material, besonders Glas, bestehenden Aufbewahrungsgefäßen für verflüssigte Gase von tiefer Temperatur, insbesondere flüssiger Luft u. dgl., auch bei den doppelwandigen Glasgefäßen (Dewarschen Flaschen), macht sich der Übelstand bemerkbar, daß zuweilen schon bei der ersten Einfüllung der Flüssigkeit, häufiger nachEspecially with those made of poorly thermally conductive, brittle i (ceramic) material Glass, existing storage vessels for liquefied gases of low temperature, in particular liquid air and the like, also with the double-walled glass vessels (Dewarschen Bottles), the inconvenience becomes noticeable, sometimes even with the first Filling the liquid, more often after

ίο einiger Zeit der Benutzung, kleinere. * oder größere Sprünge in dem spröden Material auftreten, die das Gefäß unbrauchbar machen. Der Vorgang ist -wahrscheinlich der, daß schon bei der ersten Einfüllung, infolge der bei der Einfüllung im unteren Teil des Gefäßes plötzlich auftretenden Zusammenziehung des Wandmaterials,' während der obere Teil noch verhältnismäßig warm und in seiner Struktur unverändert bleibt, gegenseitige Spannungen auftreten, die zunächst zu ganz kleinen, meist unmerklichen Rissen führen, welche bei der Wiederholung der Benutzung sich dann allmählich steigern und schließlich größere Sprünge und Undichtigkeiten verursachen.ίο some time of use, minor. * or larger cracks occur in the brittle material, which make the vessel unusable. The process is - probably that already with the first filling, as a result of the Sudden contraction of the wall material when filling in the lower part of the vessel, while the upper part Part still relatively warm and unchanged in its structure, mutual Tensions occur which initially lead to very small, mostly imperceptible cracks, which when the Use then gradually increase and finally larger cracks and leaks cause.

Gemäß der Erfindung wird dieser Ubel-According to the invention, this evil

- stand dadurch vermieden, daß in das Innere des Aufbewahrungsgefäßes Einlagen aus besser wärmeleitendem Material eingebracht werden, welche verschiedene Teile der Wandung bzw. des Bodens miteinander verbinden, so daß beim Eingießen der kältet! Flüssigkeit eine schnelle Wärmeübertragung, zwischen den verschiedenen Teilen der Innenwandung stattfindet, die das Auftreten schädlicher Spannungen verhindert. Metallbelegungen sind bei doppelwandigen Gefäßen nach Weinhold-Dewar, insbesondere in Form von Verspiegelung-en, bereits· benutzt worden. Dabei befindet sich die Metallbelegung indes im Gegensatz zum Erfindungsgegenstand im Innern des evakuierten Hohlraumes und dient lediglich dem Zweck, durch Erzielung einer stark reflektierenden Oberfläche den Wärmeverlust durch Strahlung zu verhindern. Da sich der Überzug, nicht an der Innenseite des Innengefäßes, sondern an der Außenseite des Innengefäßes und an der Innenseite des Außengefäßes, d. h. in demVakuumzwischenraum befindet, so kann die Wirkung, eine schnelle Wärmeübertragung beim Eingießen der kalten Flüssigkeit zwischen den verschiedenen Teilen der Inrienwandurig zu erreichen, wie sie beim Gegenstand der Erfindung auftritt, durch diese bekannten Anordnungen nicht, erzielt werden.- stood thereby avoided that deposits from inside the storage vessel better thermally conductive material are introduced, which different parts of the wall or the floor with each other, so that it is cold when pouring! liquid rapid heat transfer between the different parts of the inner wall takes place, which prevents the occurrence of harmful tension. Metal coverings are for double-walled vessels according to Weinhold-Dewar, especially in the form of Mirror coatings, already · been used. In contrast to the subject matter of the invention, the metal coating is in the Inside the evacuated cavity and only serves the purpose of achieving a highly reflective surface to prevent heat loss due to radiation. There the coating, not on the inside of the inner vessel, but on the outside of the Inner vessel and on the inside of the outer vessel, d. H. in the vacuum gap is located, it can have the effect of rapid heat transfer when pouring to reach the cold liquid between the different parts of the inrien wall, as occurs in the subject matter of the invention, by these known arrangements not to be achieved.

Die wärmeleitende Verbindung gemäß der Erfindung- wird zweckmäßig insbesondere zwischen dem Boden und dem oberen Teil der Wandung hergestellt und kann aus einem der Form des Gefäßes entsprechenden Metalleinsatz, der z. B. aus Metallstreifen gebildet ist, bestehen. Zweckmäßig wird der Metalleinsatz federnd gestaltet, wodurch unerwünschte Druckbeanspruchungen durch ungleiche Zusammenziehung bei der Abkühlung zwischen Gefäßwand und Einsatz vermieden werden. . Auch wird dadurch ermöglicht,The thermally conductive connection according to the invention is particularly useful between the bottom and the upper part of the wall and can be made of one the shape of the vessel corresponding metal insert, the z. B. formed from metal strips is exist. The metal insert is expediently designed to be resilient, which makes it undesirable Pressure stresses due to unequal contraction during cooling between the vessel wall and the insert are avoided will. . This also enables

Claims

to be able to introduce the metal insert into a vessel with a narrowed mouth. In order to avoid that the liquid touches the glass bottom directly when it is poured, the S insert can have a closed bottom. You can also use intermediate layers made of less conductive material, such. B. thin slices of asbestos o. The like. Insert, which prevent direct contact between the metal and the glass and slow down the heat balance somewhat. In the accompanying drawing, an embodiment of a storage vessel ■ X5 is shown, which is provided with an insert according to the invention, namely FIG. 1 shows a Dewarsches vessel made of glass, which is provided with the insert, while FIG Illustration shows. In the illustrated embodiment, the cylindrical Dewar glass vessel α is provided on the inside with an insert b made of sheet metal. This has a closed base c, which is connected to the upper edge d by sheet metal strips. is bound, and adapts its shape and size to the interior of the Dewar's vessel α. By means of an incision e or other suitable means, the insert is made somewhat resilient so that it yields easily when the outer vessel is contracted and damage to it is avoided. The resilient design also allows the use of these inserts in vessels that are not completely cylindrical in shape, but have a narrowed mouth or neck, in that the insert is pressed together sharply for insertion so that it can be pushed through the neck and then under the spring action inside the vessel assumes its old form. The bottom c is made of a coherent piece of sheet metal. Wires o. The like. Are formed. In order to achieve a softer contact with the insert and a more gradual heat transfer, in the illustrated embodiment, pads made of a flexible, less conductive material are connected to the insert b. Such intermediate layers are in the illustrated embodiment at / on the bottom, and at g The lateral strips of the insert are provided. These intermediate layers can also be omitted if rapid heat transfer is important. l Due to the different thermal conductivity of the various metals, you have it in your hand, with a suitable selection. The insert can be made from a highly conductive metal, such as sheet copper or the like, or entirely or partially from a poorly conductive material, such as tin (e.g. tinfoil, etc.). You also have it in your hand, the heat transfer by application more or less thick To change materials. The use can z. B. can also be made of fine wires, wire mesh, corrugated sheet metal or the like. In the form of the insert, one can take into account the particularly endangered points of the vessel to be protected and, for example, make the device so that the thermally conductive contact is only made with those points which experience has shown to have the greatest voltage differences. · Ρλ τ en τ claims:

1. From poorly thermally conductive, brittle material, ■ in particular glass, existing storage vessel for liquid air and thermally conductive connection is established.

2. Storage vessel according to claim i, characterized in that the thermally conductive compound made of a metal insert corresponding to the shape of the vessel, z. B. made of metal strips.

3. Storage vessel according to claim i, characterized in that the thermally conductive connection, consists of a resilient metal insert.

4. Storage vessel according to claim, ι and 2, characterized in that that the insert 'has a closed bottom. ■

5. Storage vessel according to claim i, characterized in that between the insert and the glass bottom _t or glass wall is an intermediate layer preventing the immediate system of 'poorly conductive material ^ z. B. thin asbestos slices or strips, is inserted.

1 sheet of drawings.