CZ96793A3 - Cover for containers - Google Patents

Description

Technical field

The invention relates to a lid for containers, wells and the like which are under positive pressure and have no aggressive or corrosive contents, and a seal is provided between the lid and the container.

BACKGROUND OF THE INVENTION

Such caps are usually mounted on bottles and secured with screws, bolts or the like. The fastening aids must in this case transmit the forces due to internal pressure from the lid to the flange, being tensile and therefore elongated. This elongation relieves the seal and tends to leak.

For this reason, the fastening aids must be preloaded so that the seal is not unacceptably relieved even at the highest assumed internal pressure, which in turn exposes the fastening aids to a much stronger load than would be necessary. In the depressurized state, the gasket is also too compressed, which reduces its service life.

In kitchen pressure cookers, it is known to form oval-shaped lids and insert them through a corresponding opening in a rotatable manner inside the pot, where they are straightened and pressed against the seal from the inside. These lids are held by a lever which lies from the outside and which in most cases simultaneously forms the ear of the closed pot.

In round or round containers, the oval formation of the lid is undesirable due to the uneven stress on the adjacent parts of the container, so that such a design has not been known yet

SUMMARY OF THE INVENTION

It is an object of the invention to take advantage of the known solution in the above-mentioned technical field, the invention being based on the finding that the use of a lost lid is possible with a non-aggressive container content.

The invention is based on the fact that the lid is substantially round and has a larger diameter than the opening to be closed, and that in the closed state it is inside the container with respect to the opening it covers.

These measures make it possible that the lid fastening has to bear only the weight of the lid without the need for greater preload of the seal. With increasing internal pressure, the lid is pushed against the seal, thereby relieving the lid attachment, so that the lid weight represents the maximum attachment load.

According to one embodiment of the invention, the lid in its central region consists of a material similar to the material of the adjacent wall of the vessel, the lid having an annular flange substantially corresponding to the vessel flange, the interface between the two flanges having a frustoconical shape.

In this embodiment, the stresses of the wall of the container or of the lid resulting from the internal pressure are at best passed further so that the lid does not form a weak part of the container.

In this case, the lid is preferably formed from a portion of the container wall, bent in two dimensions, which has been cut from the container to form a lid opening. For this purpose, the lid is optionally introduced into the interior of the container and provided there with a circular flange corresponding to the container flange. This measure is also applicable if the lid region of the container is not rotationally symmetrical. The advantage is that waste parts are prevented from entering and that the cover plate becomes unnecessary.

In a variation of the last two embodiments, an embodiment is used that the angle of the seat cone alpha is chosen so great that even after long periods of time when the lid has not been removed, the seat does not become self-locking.

A preferred seal is a circular seal, possibly in a double seal, which is preferably provided in the container flange in one or two circumferential grooves.

The lid is introduced into the container prior to assembly of the container, or, if the container has other larger openings, transported in its place through these openings.

The invention will be explained below with reference to the drawings, which show two embodiments of the invention.

Overview of the drawings

Giant. 1 is a cross-sectional view of the edge region of the lid with the respective wall of the conical seat, and FIG. 2 shows a variation with a planar seat.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows a portion of the container wall 7 in the region of its flange 2 from the container. In total, the axis of symmetry of the lid coincides with at least the local axis of rotation of the container, for example with the eccentric shell of the container in the form of a lying cylinder. The flange 2 of the container is in sealing engagement with the flange j3 lid which is formed in substantially annular and is disposed inside that region of £ ² vrcnlíkovitá material comparable to the material wall of the first container.

The container wall 7 is welded to the container flange 2, similarly the top heading 9 is welded to the lid flange. Preferably, the calotte 9 lies in a continuation of the container wall 7. This achieves as little damage as possible to the mechanical strength of the entire container. The lid does not have to be spherical in shape, but is quite rotationally symmetrical, but at least twice.

In this case, it is advantageous that, as shown, the calotte 2 is arranged lying on the side of the annular protrusion 10 projecting radially inside the container, so that as the internal pressure increases, the calotte 4 is more and more abutting on the flange 15.

The contact surface between the container flange 2 and the lid flange 8 is a truncated conical surface, the cone widening towards the interior of the container. This makes it impossible to remove the lid from the container without breaking, but it is achieved that with increasing internal pressure the sealing properties improve or at least do not deteriorate.

The angle of the alpha cone that occurs between each forming line 11 and the axis of the cone or between each line 12 parallel to the axis of the cone and intersecting the respective forming line 11 is preferably selected such that the seat does not tend to become self-locking even after a long time. facilitates opening the container

Preferably, the alpha angle is about 10 °.

In the illustrated example, the seal itself consists of two annular rings 2 which are seated in the circumferential grooves in the frustoconical surface of the container flange. As a result, they are very well protected from damage and their sealing function is not reduced by the possible minimum displacements of the two flange parts along the contact surface.

In order to keep the lid in place in the non-pressurized container, fastening devices 4 and 7 are provided which, as mentioned above, must at most bear the weight of the lid and the sealing, compared to the insignificant sealing bias. The fastening devices consist of shafts 4 whose ends extend parallel to the plane of the opening, the holes of these ends passing through bolts or threaded rods 5 and nuts 6 and seated in respective threads of the container flange.

To inspect or clean the tank, it is sufficient to hold the lid on the retaining ring (not shown) with a hoist or the like, release the fastening device, usually in three pieces, and then lower the lid into the interior of the vessel.

In areas of application, particularly in the case of liquid gas containers, there is no need to worry about any unacceptable corrosion on the lid over the life of the container, so that the fact that the lid cannot be removed from the container without disturbing it does not present any disadvantages.

Giant. 2 shows a further embodiment which, except for the shape of the lid seat, corresponds to the embodiment of FIG. 1. This seat in the illustrated embodiment is planar and lies in a plane perpendicular to the lid axis (not shown). The seal 3 preferably lies in the groove of the flange j) of the lid in order to facilitate its insertion or replacement.

The invention may be varied in various ways, for example, other fastening devices may be used for the lid or flat surfaces may be used in place of the top heading. Other forms of gasket may also be used, especially when an improvement in gasket is desirable as the internal pressure increases.

The lid may be provided with any of the known fittings and conduit bushings as known in the art without losing the invention.

Claims (9)

PATENT CLAIMS <Λ3 π o co - <r * X- ·>; O 5 6 i <x * o t o · CO co «O cr oc A lid for a round receptacle filled with a non-corrosive environment, in particular liquid gas, and standing under increased internal pressure, wherein a seal is provided between the receptacle and the lid, characterized in that the lid (8, 9) and its opening are substantially round shape, wherein the lid diameter is larger than the diameter of the opening and that the largest lid diameter in the closed state of the container lies within the smallest diameter of the container opening. Lid according to claim 1, characterized in that the contact surface between the lid (8, 9) and the container (1, 2) is frustoconical. Lid according to claim 2, characterized in that the angle alpha between each forming line (11) of the contact surface and between the line (12), this forming line intersecting and parallel to the cone axis, is so great that self-locking does not occur. Lid according to claim 2, characterized in that the angle alpha between each forming line (11) of the contact surface and between the line (12) forming the line intersecting and parallel to the cone axis is of the order of 10 °. Lid according to any one of claims 2 to 4, characterized in that at least one annular ring (3) is provided as a seal. Lid according to claim 5, characterized in that the annular ring (3) is seated in the circumferential groove of the contact surface of the container (2). Lid according to any one of claims 1 to 6, characterized in that the lid consists of a round lid flange (8) into which the top heading (9) is welded, preferably consisting of a material substantially corresponding to the wall material (1). container and has substantially the same wall thickness. Lid according to claim 7, characterized in that the lid (9) lies in a continuation of the vessel wall (1) and consists in particular of that part of the vessel wall which has been removed to form the lid opening. Lid according to any one of claims 7 or 8, characterized in that the edge of the cap (9) lies on that side of the annular, radially inwardly projecting projection (10) of the lid flange (2) facing the container (1).