DE1525515A1 - Elastic seal - Google Patents

Description

, PATENT LAWYERS

DIPL.-ING. FRITZ THIELEKE DR.-INQ. RUDOLF DÖRING DR. JOACHIM FRICKE

BRAUNSCHWEIG - MUNICH

ö? he A.P.V. GOMPAIY LIMITED, of Manor Royal, Crawley,

Sussex, England

"Elastic seal"

The invention "relates to an elastic gasket for! Liquids leading fittings pipes od. The like. You" refers insfre-% sondere M seals for devices such as "heat exchanger, heater, pipes, and connecting means.

In the following, reference is made in particular to plate-shaped heat exchangers or liquid heaters. These two "special ones." Shapes of devices are given as examples of applicability to "consider the seal designed according to the invention," without restricting the field of application through the exclusive treatment of these plate-shaped embodiments to take place on such devices.

In many devices that are used for heating and cooling as well as pumping liquids, seals "are required to the Liquids in the devices, fittings or the like. To keep or separate liquids that are rarely opposite each other such devices flow to separate from each other. Examples for this 3ind, heat exchangers in plate form or plate-shaped Heater.

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Essentially, shaped elastic seals are used for this purpose. The elastic materials currently available for making such seals are essentially several types of different rubbers, which can cover a relatively wide temperature range, and these types of rubbers also have adequate chemical resistance to attack by the, even at the higher temperatures Own liquids. However, the elastic sealing materials currently available have a weakness in terms of their poor resistance to the corrosive effects of some solvents. B ₀ Viton gum very sensitive to attack by ketones. However, all types of gumin are attacked by nitric acid. Low molecular weight esters> Turpentine and aromatic compounds such as benzenes and naphthalene are just as difficult to hold back for a reasonably long period of time using elastic seals made of conventional materials, because the rubber is chemically softened and dissolved. It is known that many liquids which cause problems with regard to their solvent character can be retained by inert materials, for example by asbestos. Unfortunately, however, very great difficulties arise when using asbestos as a sealing material for plate-shaped heat exchangers, because asbestos is not at all elastically compressible. There is therefore the need to generate high compression forces or clamping forces when using asbestos,

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making the cost of frame and housing very high or become unsustainable.

The invention is based on the object of creating a seal by means of which the difficulties described can be overcome.

To solve this problem, the one mentioned at the beginning is characterized Seal according to the invention by a core made of an elastic Material, which over its entire length by a flexible, thin-walled and tubular casing made of a corrosion-resistant Material is surrounded, with the ends of the sheath fixed to form a seal in the form of a closed loop and are tightly connected to each other.

Any rubber, preferably a rubber, is suitable as the core material temperature-resistant rubber like e.g. ITitryl rubber, silicone- ' gum / ai or buty! rubber hardened with plastic.

The outer tubular envelope can be made from one material which the given conditions of the is adapted to the procedure to be carried out. Materials or materials with very high corrosion resistance that are particularly suitable sinks, "form fluorinated ethylene-propylene-Iiarze. Under less yc: i..i <-ri; en working conditions can use materials such as ΙοΙ, πγinylohlorid ', polyethylene, polypropylene or nylon i.a. bew-tnäe.t '.veriJen.

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The invention finally relates to a device for Durohführung a treatment of liquids, which is characterized in that it is designed according to the invention with a Seal is equipped.

An embodiment of the seal designed according to the invention is shown in the drawings.

The figur.1 shows a view of a heat exchanger in plate form with a cut housing and with two execution forms of the seal designed according to the invention.

FIG. 2 shows a sonity along the line II-II in FIG on a larger scale »

Figure 3 shows a child by the new seal for explanation a manufacturing step.

FIG. 4 shows a sonity along the line IY-IV in FIG on a larger scale in a further embodiment of the seal.

In the figure 1 is a typical example for the application of a according to the invention, formed seal shown. A heat exchanger 1 in plate form supported with a rod 2 and a rail 3 forming a frame is provided with a seal

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4 equipped, which in a comprehensive to take the Seal 4 serving recess 4a is added. The ■ Deepening 4a also surrounds openings 5, 6, 7 and 8. The main seal 4 separates openings 6 and 8 from the flow space, and these "two openings serve as thermoset openings. They are · j by means of annular seals 4b, which between themselves and the seal 4 and each of the openings 6 and 8 a gap left, surrounded. The sealing of this gap is not ^ j absolutely necessary, but the flat support of the plates can make the insertion of g-ummistüokohen 4c of suitable length advantageous appear. These small pieces of rubber 4o can be placed in the recess with or without a nylon or other covering 4a can be introduced in the normal way. Since at these points where these seals or G-ummistreifen 4c are located, there is no Attack by the process fluids is to be feared also no special precautions to be taken. The openings 5 and 7 communicate with the flow space and act as inlet and outlet openings for the flowing liquid.

In FIG. 2 there is the recess 4a for receiving the seal 4 reproduced in section and on an enlarged scale. It can be seen that the seal 4 has a core made of a suitable elastic Has material which is surrounded by an outer tubular casing 10 made of corrosion-resistant material. the Ends of this tubular sheath are closed to the elastic Core material from the possibility of corrosive / attack

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to protect by the liquid in the flow space. The seals 4b are designed in the same way.

The tubular sheath 10 can, for example, be an outer diameter diameter from about 6.35 to 8.39 mm and have a wall thickness of about 0.254 to 0.762mm *

^ For connecting or "closing the ends of the tubular shell 10 can be committed numerous ways, but in particular" i sondere when using a fluorinated ^{Ithylen-propylene-Har-!} Zes can difficulties. A satisfactory connection, however, can be produced, when the core 9 is wrapped by means of a tape 11 (see Figure 3) made of a copper foil in the area of the abutting ends of the tubular casing 10. Thereafter, the abutting ends 12 of the casing 10 are heated, ie by induction heating by means of the copper foil 11 from An induction heating coil 13 is used for induction heating of the strip 11. This process is preferably carried out in the substantial absence of oxygen by removing air from the interior of the envelope 10 and adding an inert gas, for example: Nitrogen or argon.

Induction heating can be used to bond the inside surfaces the sheath 10 can be used at the abutment while an additional heating can be applied to the too

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To connect the outer sides or outer surfaces of the shell. To this For example, hot air or heated inert gas can be used like nitrogen inside a pod that adjoins each other Ends of the sheath 10 surrounds, are brought into use.

The still shapeless double ring of the prepared length is then through Heat application on a mold to the desired diohtungsform convicted.

In general, adhesives prove to be used for fixing seals, but in particular for fixing corrosion-resistant Enclosure of the new seal are suitable as being less resistant to solvents than the tubular envelope itself. Before it is not possible by welding, d, h. Application of heat or similar measures, which can be used, for example, with nylon connections, etc., a definition of the seal To educate in deepening new ways have to be found.

One way to overcome these difficulties is that another cover 14 (see left side of Figure 1 and Figure 4) is wrapped substantially around the sheath 10 from a corrosion-resistant material. This further sheath 14 is with a radially outwardly directed flange or several lugs 15, which extend laterally outward over the seal and 'also extend the plate-shaped heat exchanger · out. The-

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Be Jahnen 15 can be "at 16" around the hand of the plate-shaped Austausoners flex and grip when heat is applied thus the edges, so that a connection on the base of the mold is created, by which the diohtung is retained in the recess. This position maintains the seal 4 even if in the example shown, the stack of plate-shaped heat exchangers is opened. Instead of the flags 15 shown in the example and described in detail, a single, Flange-like extension extending over the entire length the further wrapping can be provided.

The seal described can be within the scope of the invention vary widely and adapt to special conditions.

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Claims (9)

1525516 claims 1. Blastic sealing for fittings carrying liquids Pipeline or the like, d u r o h marked i c h net, that the seal (4) has a core (9) made of an elastic * - has rule material, which on its entire length of a flexible thin-walled and tubular hall (10) is surrounded by a corrosion-resistant material, the ends of the shell to form a seal in a lorm closed loop firmly and tightly connected to each other are. 2. Seal according to claim 1, d ad u r c hg e ke η nz eic hn e t that the tubular casing (10) with an outer diameter from about 6.25 to 8.89 mm a wall thickness of about 0.254 up to 0.762 mm. 3. Seal according to claim 1 and / or 2, since durchgek en η ζe I η et that the thin-walled tubular casing (10) is made of a fluorinated ethylene-propylene resin. 4. Seal according to claim 5, dadurchgek e τι η ζ ei without t that the ends of the shell (10) on the inside by induction heating by means of a core (9) at the joint of the shell ends surrounding copper tape (11) or a similar 9D982i / 079e are connected to each other without electrically conductive foil. 5.. Seal after. Claim 4, characterized in that g e k e η η ζ e ic hn e t that the interior of the envelope (10) enclosed air "is freed and filled with an inert gas. 6. Seal after. Claim. 4 and / or 5, d u r eh. Ge - £ denote i e hη et that the ends of the sheath (10) are on the outside are connected by means of a further heat treatment. 7 · Seal according to one or more of claims 1 to 6, d a d u r c h g e k e η η ζ e ic h η e t that means for mechanical - Close holding of the seal (4) in one for receiving the Seal serving recess (4a) are provided. 8. Seal naoh claim 7, d a you r c h ge k e η η ζ e ic h net that for mechanical fixing of the seal (4) outside the shell (10) a further outer shell (14) made of corrosion-resistant material is provided, which has a flange or has attached flags (15 »16). 9. For the treatment of liquids serving device, d a by g e k e η η ζ ei c h η e t that they with an or . several seals according to one or more of claims 1 to 8 is equipped. 9 0 9824/0 7SS ^{& A} °