DE1901257U - GAS-TIGHT PLASTIC HOSE FITTING. - Google Patents

Description

G-asdi elate plastic hose connection

Screw connections of plastic hoses with metal pipes are known. They are characterized by the fact that a support sleeve is inserted into the end piece of a plastic hose is. In previously known constructions, this support sleeve is provided with an end collar, up to which the sleeve is inserted into the Plastic hose is inserted. The plastic tube with the inserted support sleeve is inserted into a clamping screw, whose bore widened conically at its upper end is. A clamping ring protrudes into this cone and is pushed over the plastic tube. This clamping ring is cylindrical. It is pressed into the inner cone of the clamping screw when the terminal nut is tightened. It deforms in the way that it compresses the plastic hose and presses it into a recess in the support sleeve, whereby the plastic hose stuck on the support sleeve. This clamping effect first of all seals the hose on the sleeve on the latter Job. On the other hand, a force can be exerted on the support sleeve with their help, which this with its collar in a corresponding inner collar of the clamping screw presses when the terminal nut is tightened.

The disadvantage of this construction is that the collar of the support sleeve does not seal against the inner collar of the clamping screw. Since these two parts are not fitted pieces - the manufacture of which would otherwise make the construction much more expensive - the pressure exerted by the collar of the support sleeve on the inner collar of the clamping screw when the clamping nut is tightened is not sufficient to remove these two parts To be able to seal parts against each other. This allows durcfegeleitete gases between these two flange parts and still escape between plastic tube and the bore of the clamping screw and between Klem mr ing and bore of the clamping screw. A sealing of the parts mentioned against each other is therefore not guaranteed in this way.

This deficiency is a hose screw connection whose exemplary embodiments are shown in the drawings 1, 2 and 3.

Appendix 1 shows an embodiment in which a support sleeve (l) is inserted into the plastic tube (2). New to this one Support sleeve is that it has no collar. Without a collar, it is about 2.5 mm long in a hole (3) in the clamping screw (4), whose inner diameter is as large as the outer diameter of the Support sleeve (1), a snug fit is not necessary. The end of the support sleeve protruding from the hose sits against it an inner collar in the clamping screw (4).

Another new feature is that the inner bore of the clamping screw is now has two cones. One cone (5) sits as before at the upper end of the bore and serves to receive and Deformation of the clamping ring (6). The other cone (7) sits at the end of the hole into which the plastic hose (2) with support sleeve (l) is introduced and represents the transition from this large-diameter hole to the small-diameter hole Diameter into which the support sleeve protrudes without a hose. This arrangement has the opposite of the old design the following advantages:

By tightening the clamping nut (8), the glue ring presses the plastic hose into the lower cone and thus both against the walls of the clamping screw and against the outer surface of the support sleeve. In this way, due to the plastic deformability of the plastic hose, a gas-tight seal is brought about both on the outer surface of the sleeve and on the wall of the clamping screw. A gas tightness at the end of the support sleeve protruding into the small bore of the clamping screw, in particular at the inner collar in the bore, is therefore not important.

I ¹ The easiest way to assemble is the embodiment according to drawings 2) and 3). Here, too, exactly as in the embodiment according to Annex 1), the sealing effect is brought about by a conical deformation of the plastic hose. The-

Claims (2)

F.A497856 * 1-if. but se is brought about on a cone which is screwed into a collar of the support sleeve. This is designed in such a way that it simultaneously serves as a discharge pipe for the gas and has an outer collar at the point where it protrudes from the plastic tube. On the side facing the plastic hose, this is designed in such a way that it forms the aforementioned cone with the support sleeve (Figure 2) or with the inner wall of the clamping screw (Figure 3), which causes the plastic hose to deform. On its other side, the outer collar of the support sleeve is used to rest on an inner collar of the clamping screw, against which the collar of the support sleeve is pressed when the clamping nut is tightened. If the arrangement, which is otherwise unchanged compared to the embodiment according to Appendix 1), is put together, both the clamping ring and the cone on the collar of the support sleeve press the plastic tube so tightly onto the support sleeve (Figure 2) or the clamping screw (Figure 3) »that here a gas-tight seal comes about. A further sealing point does not arise in this embodiment because of the corresponding configuration of the support sleeve. The previously usual screwing in of the support sleeve, into which the clamping ring presses the plastic tube, can be omitted. Protection claims: 1) Gas-tight plastic hose screw connection characterized by that the plastic hose is deformed conically by pressure when screwing. 2) Gas-tight plastic hose screw connection according to claim l) characterized in that the support sleeve is designed as a soldering end for the pipeline.