DE2606554A1 - BOILER - Google Patents

Description

26CH5J4

DR. FRIEDRICH E. MAYER 753 pforzheim

DIPL.-ING. A. PANTENBURG western 24

KABELi TRIPATENT PFORZHEIM PATENT LAWYERS phone <o 72 to ι a4 60

Koninklijke Metaalwarenfabrieken Daalderop BV Tiel , The Netherlands.

boiler

The invention relates to a boiler of the type with an outside boiler made of metal and an inner jacket made of plastic and to a method for manufacturing such a boiler.

It is known a metal boiler of a boiler with an operating temperature of about 80 C and an operating pressure of about 8 atm to be provided with a lining on the inside. This cladding can be made of enamel or cement exist, but also inner linings made of plastic are known, which are baked in some way on the metal outer boiler.

These known boiler constructions have the following disadvantage. Due to the temperature gradient through the boiler wall, the vapor tension of the water and the gases in the water, such as carbonic acid and oxygen, are higher inside the boiler than outside the boiler. It is inevitable, therefore, that such gases through diffuse through the inner shell, which can lead to local accumulations between the metal outer vessel and the plastic inner lining, which can use at this point corrosion of the Off s Enke seiwand.

B0983S / 0662

ORIOINAU INSPECTED

The present invention is intended to prevent such a boiler Harmful gases, steam and the like can reach the space between the plastic inner jacket and the metal outer boiler in an uncontrolled manner.

A material that only allows gas diffusion to a very limited extent, is e.g. polypropylene. This has a rather great rigidity, so that it is almost impossible to use an inner jacket made of this material to be introduced into the outer kettle via the kettle neck opening without the Inner jacket is damaged e.g. by kinks in the wall.

From DT Auslegeschrift 1 911 316 a method for producing a Boiler boiler known, with one of two shell-shaped end parts and one cylindrical intermediate part made of metal and a composite outer shell as insert:, formed inner jacket made of plastic, in which the parts of the Outer boiler arranged around the inner jacket and welded to one another be attached. In this method, namely, the lower shell-shaped end part is welded to the cylindrical intermediate part, whereupon over the wide opening at the free end of the cylindrical intermediate part of the relatively Stiff, thermoplastic material made inner jacket introduced whereupon the shell-shaped end part closing the outer vessel is attached to the intermediate part by means of a flange connection.

Not only is it very difficult to seal this flange connection well to train, but such a flange connection is also expensive and has a detrimental effect on the exterior of the boiler.

According to the invention, all of the above-mentioned disadvantages associated with known processes can be avoided if the parts of the outer boiler are connected to one another only by welding and for the or for each weld that is carried out after the inner jacket is arranged in the outer shell, in the inner jacket in the area of the or each Weld previously forms an inwardly directed penetration and / or Forms protuberances in the outer boiler wall in order to locally isolate To obtain a space that can be filled with heat-insulating material, if necessary, in order to prevent the heat from welding Attacks the material of the inner jacket.

609836/0662

The invention "also relates, of course, to one using this method manufactured boiler boiler, with an outer boiler, which consists of either two shell-shaped end parts rat there is a cylindrical intermediate part, or only of two end parts that are directly attached to one another in a manner according to the invention are welded.

Oxygen can not only diffuse through the inner jacket, but also via the opening in the outer boiler into the space between the inner jacket and get to the outside boiler.

To avoid this, the inner shell of a boiler, which is equipped with an im essentially cylindrical middle part, a closed, essentially spherical upper part and a lower part having a central opening and made up of an outer shell made of metal and an inner jacket Plastic is composed, according to the invention with an axially through the kettle neck opening outwardly extending part with on the radial outside be provided at least one recess opposite an axial part of the outer vessel, while in the annular space between the axial parts of the Inner jacket and outer sinker where a seal is provided. Furthermore, an elastic one can be pressed on by a metal pressure ring in the gap Packing ring arranged ain.

The elastic packing ring can be made of rubber with a Shore hardness of 1 * 0- ^ 5 be made. A highly compressible, e.g. plastic foam material can also be selected for this.

In the annular space between the axial parts of the inner jacket and the outer shell A metal filler ring can also be fitted to the kettle neck opening, e.g. by screws on the axial part of the outer kettle is attached.

As far as oxygen can reach the gap, it does so through Diffusion through the polypropylene inner jacket, i.e. mirimal and also controlled.

609836/0662

In order to further restrict this diffusion through the inner jacket, can according to a more detailed elaboration of the invention between the inner jacket and a heating element can be arranged in the outer boiler, through which the temperature the gap can be increased a few degrees, thereby increasing the temperature gradient is lifted over the inner jacket, so that diffusion from the inside to the outside is effectively avoided.

To explain the invention, with reference to the drawing, some Embodiments of the boiler described.

Show it:

Fig. 1 is a schematic, axial section of the boiler and

Fig. 2 shows a detailed section of a varied embodiment of the seal in the Opening.

According to the drawing, the boiler consists of an outer boiler 1 made of metal, e.g. steel, and an inner jacket 2 made of plastic, e.g. polypropylene. The boiler has an essentially cylindrical central part A, a closed, substantially spherical upper part B and one substantially spherical Lower part C, in which a central opening for the passage of the necessary Lines, e.g. a water inlet line, a water drain line, an electrical heating element, a thermostat, etc. is provided.

The cylindrical middle part A can, as shown, to the end parts B and C belong, but also as a single, cylindrical intermediate part be trained.

After the two essentially shells for mi gene halves / from which the outer boiler consists are arranged around the inner jacket 2 made individually and from one part, they are connected to one another by a weld 3. In order to enable the halves of the outer vessel to be welded together without the material of the inner jacket 2 being attacked by the welding heat, there is an inwardly directed recess U in the inner jacket 2, so that an annular groove is formed on the outside.

609836/0662

260Ü554

which forms a heat-insulating space and can optionally be filled with asbestos or another heat-insulating material in the form of a ring 5 before the weld 3 is arranged. The ring 5 forms an effective heat shield for the underlying zone h of the inner jacket 2. The heat-insulating space can also be obtained by bulging the outer boiler parts in the area of the welding zone.

To close the space between the steel outer boiler 1 and the inner jacket 2 when the boiler opens, a packing ring 6 is used, which is preferably made of elastic material such as rubber with a Shore hardness of U0-U5. The packing ring is accommodated in an annular space which is delimited by a part T of the inner casing extending axially through the boiler opening, the part of the inner casing adjoining the axial part T, a radial flange part 8 of the inner casing and an axial part of the outer casing. In the exemplary embodiment shown, the axial part 9 is the inner edge of a steel flange ring 10, the flange 11 of which is fastened to the outer boiler 1 by a weld 12. In addition, in the illustrated embodiment, a steel pressure ring 13 is used which is provided with a flange Lh around which the radial flange part 8 of the inner jacket extends.

The pressure ring 13 has spaced apart in the circumferential direction Openings for the passage of bolts 15 through which the ring 13 can be screwed against the flange ring 10. For this purpose, the flange ring 10 is provided with threaded bores 16. For sealing the bolts a separate rubber packing 17 is used,

Next is a schematic in the right part of the lower part C of the boiler Heating element 18 indicated by that the temperature in the space between the Inner jacket 2 and the outer boiler 1 can be increased a few degrees. Through this the temperature gradient across the inner jacket is reduced, whereby diffusion through the inner jacket is eliminated or at least reduced to one Minimum is restricted.

£ 09838/0662

ORfGiNAL WSPECTED

In the preferred embodiment according to FIG. 2 there is between the axial Part T of the inner jacket 2 and the axial part 9 of the outer vessel 1 metallic filler ring 20 fitting between the stepped part 9 and the a radial recess 19 having part T is added. The fill ring 20 compresses a compressible packing 21 a.n and can be secured by screws 22 or be attached by local deformation of the part 9.

609835/0662

Claims (1)

Expectations / 1Λ Process for the production of a boiler boiler with one of two bowl-shaped End parts and a cylindrical intermediate part composed of an outer shell made of metal and an inner jacket designed as an insert Plastic, in which the parts of the outer boiler are around the inner jacket arranged and fastened to one another by welding, characterized in that that the parts of the outer boiler are connected to one another only by welding and for or for each weld that is carried out is, after the inner jacket is arranged in the outer boiler, in the inner jacket in the area of the or each weld before an inward directed deepening forms and / or protuberances in the outer boiler wall forms in order to locally obtain an insulating space that can be filled with heat-insulating material if necessary, to prevent the heat of welding from attacking the material of the inner jacket. 2. A boiler made by using the method of claim 1. 3. Boiler with an essentially cylindrical central part, a closed, essentially spherical upper part and a lower part having a central opening, which boiler consists of an outer boiler is composed of metal and an inner jacket made of plastic, characterized in that the inner jacket with an axially the boiler neck opening outwardly extending part with on the radial Outside at least one recess is provided opposite an axial part of the outer vessel, while in the annular space between the axial Parts of the inner jacket and the outer boiler a seal is provided. k. Boiler according to Claim 3, characterized in that an elastic packing ring pressed on by a metal pressure ring is arranged in the intermediate space. 609836/0662 0-554 5. Boiler according to claim U, characterized in that the packing ring made of an elastic material, such as rubber with a Shore hardness of UO-U5 is manufactured. 6. Boiler according to claim U, characterized by a metal filler ring, which fits in the inner space between the axial parts of the inner jacket and the outer kettle at the kettle neck opening and "attached" is. 7. Boiler, composed of an inner jacket made of plastic and a Metal outer boiler, characterized by a between the inner jacket and the heating element arranged in the outer boiler. 809836/0662
ORIGINAL INSPECTED Blank page