DE102006001052A1 - Pressure container for storing fluid or gaseous medium, has gap formed between collar and core container, and filled with buffer ring that has outer contour connecting contiguous outer contours of core container and collar - Google Patents

Abstract

The container has a plastic core container (1) with neck arranged in a radial interstice between a connecting ring (3) and a support flange (4). The flange encloses the neck on its periphery and has a collar (5) that projects radially outward. A gap formed between the collar and the core container is filled with a buffer ring (8) that has an outer contour connecting contiguous outer contours of the core container and the collar.

Description

The The invention relates to a pressure vessel for storing liquid or gaseous Media comprising a plastic core container having at least one collar, in the radial gap between one inserted therein Connection ring for a pressure line and the collar surrounding the outside support flange with a radially outward protruding collar is arranged, wherein the connecting ring and / or the support flange Made of metal and at least one open in the direction of the collar Having groove which contains a sealingly pressed to the collar O-ring and wherein at least the plastic core container and the federal government from a support shell a fiber composite material are at least partially enclosed.

State of technology

Such a pressure vessel is out of the DE 197 51 411 C1 known. The metallic collar ends at its outer periphery in a sharp edge that touches the plastic core container adjacent. It also forms part of a neck piece, which is screwed onto a thread of the collar and in which a collar engaging in the hollow cone is screwed, which causes a radial contact pressure of the collar to the neck piece and an O-ring seal embedded therein. The design requires a great deal of technical effort in the production and leads to a large weight.

presentation the invention

Of the Invention is based on the object, such a pressure vessel such continue to develop, that is a reduced manufacturing costs and gives a reduced weight.

These Task is according to the invention in a pressure vessel of the type mentioned above with the characterizing features of Claim 1 solved. In advantageous embodiments, the dependent claims relate.

at the pressure vessel according to the invention it accordingly provided that between the collar and the plastic core container at least in which is on the outer circumference radially inwardly adjoining Area provided in the radial direction outwardly wedge-shaped widening distance is that the gap formed by the distance by a plastic deformable buffer ring made of polymeric material is completely filled and that the buffer ring has an outer contour has, which the axially adjoining outer contours of the plastic core container and of the Federation while avoiding a sudden change of direction merging into one another combines. The while the intended use in the inner of the plastic core container effective pressure forces thereby optimally consisting of the fiber composite Support cover caught, without it being too dysfunctional Relative displacements of the items of the pressure vessel comes. The support shell can in terms of carrying capacity and to be optimized in terms of weight and pressure Breathing movements can no longer cause that the outer edge the federal incorporated in the wall of the plastic core container or the Wall at the contact parts plastically deformed.

there It is essential that the federal government is particularly resistant to deformation is. He has for this purpose a substantially triangular profile, in which the maximum extent in the radial direction in the range one to two times the maximum measured at the root Extension in the axial direction is advantageous in the region of 1.3 to 1.5 times.

To an advantageous embodiment, it is provided that the federal government at the radial outer edge in a circumferential nose terminating the buffer ring in a subarea in a circumferential recess adapted profile radially outside encloses. The facing the support shell surface is substantially uniformly arched and smooth. Even with extremely changing internal pressures achieved in that the manufacturing conditionally evenly into one another outer contours the buffer ring, the federal and the plastic core container stay and separation risks in terms of the adhesive Connection of the support shell be avoided the fiber composite.

Of the Buffer ring has mainly the purpose, the operationally inside of the plastic core container prevailing pressure in the manner of a hydraulic pressure distributor so evenly on the support shell and the support flange to distribute that a lifting of the support envelope in the area of the transition zone avoided becomes. The radially outward pointing end of the covenant can in no direct physical contact with the plastic core container reach. Even changing internal pressures can therefore no longer be cut the metallic outer edge lead the federal in the plastic core container.

The fiber composite forming the support shell expediently contains fiber strands embedded in synthetic resin which extend one over the other and extend substantially in the longitudinal and circumferential directions. The fiber strands are dependent the intended use of the pressure vessel made of glass, carbon, aramid, boron and / or Al2O3 fibers. They are applied after prior impregnation with a synthetic resin or thermoplastic in a winding process under pre-stress on the prefabricated and already provided with the fittings plastic core container and permanently fixed by solidification of the synthetic resin or thermoplastic.

Of the the supporting sheath forming Fiber composite can be complementary or alternatively crossing each other fiber strands include the longitudinal and circumferential direction inclined and expedient at the same time the longitudinal axis of the plastic core container are associated with a mirror image inclined. The longitudinal and circumferential personnel can thereby be absorbed in an optimal way. In addition, will the possibilities improves the ratio of the opening cross-section a frontal opening in relation to the inner diameter of the plastic core container size Values of at least 30%, preferably at least 50%, without that functional impairments result. This is a great advantage with regard to the installation of secondary valves.

Of the Collar, the connecting ring and the support flange are useful in the facing surface areas limited by threadless cylindrical surfaces. The production This makes it particularly easy and weight saving. Nevertheless, will an excellent mutual seal and durability reached

Of the O-ring can be made of any of the relevant, permanently elastic, polymeric sealing materials consist, for example, of natural or synthetic rubber.

Of the Plastic liner and / or the buffer ring expediently consist of polyamide. Other polymers Materials can for their manufacture, if necessary, also be used, for example PE, HDPE or PTFE. The selection is reserved for the user and arises mainly from the chemical, physical and thermal requirements of the application.

Summary the drawing

In attached to the appendix Drawing is an exemplary embodiment of the pressure vessel according to the invention in longitudinal section Representation given again. Show it:

1 a pressure vessel in longitudinal section

2 an enlarged section of the front end of a pressure vessel after 1 in half-cut representation

Execution of the invention

Of the in the figures reproduced pressure vessel is used for storage of liquid or gaseous Media that are under a pressure of up to 2,000 bar. He is at both ends with connection openings for pressure lines and / or valves provided that are differently dimensioned, but in Essential to the invention are designed identically.

The pressure vessel comprises a plastic core container 1 made of polyamide and is integrally formed on both ends collar 2 Mistake. It can be generated by a blow molding process or rotational sintering. To illustrate the invention, only the construction in the region of one of the two collars will be described, wherein the embodiments can be transferred to the other collar.

The collar 2 is in the radial gap between a connection ring inserted therein 3 for a pressure line and a collar 2 Outside enclosing support flange 4 with a radially outwardly projecting collar 5 arranged, with the connecting ring 3 and / or the support flange 4 Made of metal. The support flange 4 and the connection ring 3 surround each other at the same time with abutting, cylindrical guide surfaces in the adjoining the front end of the collar area. They are thus each other and the collar 2 assigned concentrically. In addition, the support bottle overlaps 4 the connection ring 3 with a radially inwardly extending stop surface, the connecting ring 3 touched adjacent and prevents relative tilting. This provides additional security against relative displacements of the connection ring 3 with respect to the support flange 4 and the collar 2 receive. The collar 2 , the connection ring 3 and the support flange 4 are limited in all facing surface areas by thread-free cylindrical surfaces.

In the embodiment shown, only the connection ring 3 with one in the direction of the collar 2 open groove, one on the collar 2 sealingly pressed O-ring 6 made of rubber. Relative displacements of the plastic core container caused by the changing operating pressure 1 with respect to the connection ring 3 are thereby absorbed elastically, without causing leakage. Of course, it is also possible, if necessary, to bring several such O-directional seals for application and, for example, alternatively or additionally in corresponding grooves of the support flange to accommodate. The security against possible leaks can thereby be further increased. Furthermore, the O-ring seals may consist of sealing materials that are particularly adapted to the physical and / or chemical conditions of use. The same applies to the materials that make up the plastic core container 1 is made.

The Bund 5 and the plastic core container 1 are shared by one of a support shell 7 from a fiber composite material at least partially enclosed, wherein between the collar 5 and the plastic core container 1 in the region adjoining the outer circumference, radially inward, a wedge-shaped widening outward in the radial direction is provided, wherein the gap formed by the gap is formed by a plastically deformable buffer ring 8th is filled from polymeric material and wherein the buffer ring 8th has an outer contour, which is the axially adjoining outer contours of the plastic core container 1 and the federal government 5 while avoiding a sudden change in direction connects into each other. The support shell 7 from the fiber composite material enclosing the overall resulting outer contour with the static thickness required in each case, the front ends are integrally overlapped in one another. The pressure vessel thereby has the required strength not only in the radial but also in the axial direction. The radial width of the buffer ring 8th takes up at least 50% of the radial width of the covenant 5 one.

The metallic waistband 5 ends at the radial outer edge in a circumferential nose 9 containing the polymeric buffer ring 8th , consisting of polyamide, encloses radially outside in a partial area. As a result, a good guidance of the buffer ring is obtained, which contributes to a faulty mounting or a pressure-related relative displacement with respect to the plastic core container 1 to prevent.

The supporting shell 7 forming fiber composite contains intersecting, embedded in synthetic fiber strands, which are stacked in multiple layers and which are associated with the longitudinal direction at an angle of plus / minus -10 to 90 °, advantageously at an angle of 35-88 °. The winding angles within each layer can be identical. They diverge in successive layers to meet the required strength requirements.

The fiber strands contained in the fiber composite contain fibers of carbon, in the pretensioned state in a resin matrix made of epoxy resin are embedded.

at the embodiment consists of the plastic core container and the buffer ring made of polyamide. The use of dissimilar, polymeric materials is also possible.

In the pressure vessel shown, the plastic core container has an inner diameter of 240 mm and the connecting ring one of 140 mm. This results in a pole ratio, ie a ratio of the inner diameter of the plastic core container 1 and the inner diameter of the connection ring 3 of 58%, ie, greater than 50%, which makes it easier to accommodate internals in the plastic core container.

Claims (10)

Pressure vessel for storing liquid or gaseous media, comprising a plastic core container ( 1 ) with at least one collar ( 2 ) located in the radial gap between a connecting ring ( 3 ) for a pressure line and a collar ( 2 ) outside surrounding support flange ( 4 ) with a radially outwardly projecting collar ( 5 ) is arranged, wherein the connecting ring ( 3 ) and / or the support flange ( 4 ) consist of metal and at least one in the direction of the collar ( 2 ) have an open groove, one on the collar ( 2 ) sealingly pressed O-ring ( 6 ) and wherein at least the plastic core container ( 1 ) and the federal government ( 5 ) of a support shell ( 7 ) are at least partially enclosed by a fiber composite material, characterized in that between the collar ( 5 ) and the plastic core container ( 1 ) is provided at least in the region radially inwardly adjoining the outer circumference a radially outwardly wedge-shaped widening distance that the gap formed by the gap by a plastically deformable buffer ring ( 8th ) is filled from polymeric material and that the buffer ring ( 8th ) has an outer contour which the axially adjoining outer contours of the plastic core container ( 1 ) and the Federal ( 5 ) merges into one another while avoiding a sudden change of direction. Pressure vessel according to claim 1, characterized in that the collar ( 5 ) at the radial outer edge in a circumferential nose ( 9 ) ending the buffer ring ( 8th ) encloses in a partial area radially outside. Pressure vessel according to claim 1 or 2, characterized in that the support shell ( 7 ) forming fiber composite contains each other crossing, embedded in synthetic fiber strands extending in the longitudinal and circumferential directions. Pressure vessel according to one of claims 1 to 3, characterized in that the support shell ( 7 ) forming fiber composite comprises cross-over fiber strands, which are associated with the longitudinal and circumferential direction inclined. pressure vessel according to one of the claims 1 to 4, characterized in that in the fiber composite contained fiber strands Glass fibers, carbon fibers and / or aramid fibers. Pressure vessel according to one of claims 1 to 5, characterized in that collar ( 2 ), the connecting ring ( 3 ) Support flange ( 4 ) are limited at least in the mutually facing surface areas by thread groove-free cylindrical surfaces. Pressure vessel according to one of claims 1 to 6, characterized in that O-ring ( 6 ) consists of elastomeric material. pressure vessel according to one of the claims 1 to 7, characterized in that the plastic core container and / or the buffer ring is made of polyamide. pressure vessel according to one of the claims 1 to 8, characterized in that the ratio of the opening cross-section of a frontal opening in relation to the inner diameter of the plastic core container at least 30%. pressure vessel according to one of the claims 1 to 9, characterized in that the ratio of the opening cross-section of a frontal opening in relation to the inner diameter of the plastic core container at least 50%.