DE3237929A1 - PIPE OR HOSE CONNECTION - Google Patents

Description

Patent attorneys Dipl.-Ing. W. Beyer Dipl.-Wirtsch.-Ing. Β · Jochem

Prankfurt / Main

Staufenstrasse

Note: Giovanni FASSINA

Alessandro FASSINA Roberto FASSINA Via Monterosa 4, Agrate Conturbia Viale dei Mille 3o, Vigevano Viale dei Mille 3o, Vigevano (Italy)

PIPE OR HOSE CONNECTION

F 3689

description

The invention relates to a pipe or hose connection which two terminal ends, at least one of which is made of an elastomer, have matching profiled inner and outer surfaces and are to be brought into engagement axially overlapping.

The connection mentioned can be one between tubes made of elastomer or a tube made of elastomer and act a sleeve, a connection or directly a usage device. In particular, the invention is applicable to compounds between pipes or a pipe and a socket or an outlet or inlet connection of a usage device, which has an inlet or outlet for gases, liquids or flowable, powdery or granular substances.

As is known, it is the case with numerous devices, in particular in the case of the semi-flexible ones, it is necessary to use flexible cables, both to ensure a perfect connection as well as for ease of assembly and also to avoid the transmission of vibrations. Typical examples are all household electrical appliances and boilers for transporting liquids in general.

To ensure flexibility, all lines are made of more or less deformable and more or less reinforced Elastomer, depending on the pressure they can withstand and the flow they need to divert.

The flexibility of these lines, which enables the quick connection, also causes deflection under the pressure of the Liquid which, due to its effect, also presses along the axis in every direction and easily pulls the tube out. Around To avoid this disadvantage, the rubber holder is given a special profile and the hose is attached to the rubber holder with metal clamps that are tensioned by tightening screws or nut bolts.

This connection system has the disadvantage that the metal clamps rust and break, especially in damp rooms are exposed and therefore cannot be used several times and are not very durable. There are also metal clamps not very practical, not very beautiful, and require more cost and labor to install.

Very expensive stainless steel clamps or very tough plastic clamps have also been used; these however, were only suitable for a low pressure and a small diameter.

Efforts have also been made to reduce the times and costs of assembly by using the mounting brackets completely eliminated or reduced them to solid rings. In the Italian patent application No. 26811A / 8O there is a connection described for pipes in which the ends of the pipes or parts to be connected have different diameters, see above that the one tube is clamped in the other, and they are with beads or annular, adjacent, additional and fitted and connected recesses.

However, this type of connection does not achieve satisfactory ones Seals when the pressure of the liquid is very high and when the outer tube in relation to the inner tube or -connection is elastically very deformable. Because the liquid in this case is between the superimposed ends of the two Pipe runs, it puts pressure on both the inner and outer pipe. As a result of this pressure, the shape of the Inner tube unchanged, since both surfaces are exposed to the same pressure are, whereby the passage of the liquid and the dissolution of the outer tube are favored.

The object of the present invention is to provide an improved Establish connection of the type mentioned, in which the disadvantages do not exist, so the

is not only practical to use, but also not additional Requires costs, is rustproof and has a perfect tightness at high pressures, even with elastically deformable ones Pipes, made possible.

The above object is achieved according to the invention in that the connection end, which is larger in diameter, has an annular, axially extending pocket is formed, the radially inner peripheral wall in the insertion direction of the diameter smaller connecting end is flared and dimensioned so that the axially outer region of the in the pocket introduced into the Smaller diameter connecting end between the radially inner and radially outer walls of the pocket under radial tension is held.

When connecting two such pipes together, the free end of the pipe with the smaller diameter will fit into the the pocket forming the annular truncated cone cavity and is against the inner wall of the outer tube of the annular cavity printed, whereby the pressure of this ring is increased on the profile of the inner tube. The connection can be established as follows be: between pipes made of elastomer, in which one pipe has the end to be connected with a larger diameter and the inner surface of which is provided with annular depressions and the other tube is additionally annular on the outer surface Has ribs.

This connection can also be between a pipe made of elastomer and a socket or a pipe connection at the inlet or outlet of a Use device, such as a household appliance, are produced. In this case the socket or the pipe connection has that Profile of the inner pipe, and on its outer surface the pipe is adapted, since its end has a larger diameter and it with Inside depressions is provided. The new connection, the subject of the present invention can also be used for coupling pipes of the same diameter. In this case one uses a sleeve, the two ends of which have a larger diameter, so that the ends of the pipes to be connected there

can be used. The inner surface of each end the sleeve is corrugated and annular recesses and inside with an annular cavity extending from the surface of the Sleeve and a protruding, firmly attached to the body of this sleeve seated frustoconical ring is formed, provided accordingly the ends of the pipes to be connected on the outer surface additional Ribs and depressions that are opposite to those of the socket, The ribs and depressions can be round, be helical or otherwise. You can go through simple Grooves or raised ribs are replaced, the free The end of each pipe to be connected must be worked out accordingly and attached at a small distance from one another.

To ensure better sealing of the connection, For example, a ring made of any solid or elastic material can be used outside the connection area, which can pass through a simple sliding axial movement tightened vigorously by hand will. The connection of the pipes or the pipe with the Sleeve or the device is carried out by the sliding axial movement from one end to the other. With this sliding axial movement The ribs and depressions deform instantly, only to return to their original shape and position when each rib of one end in the corresponding recess of the other to be connected end and vice versa is clamped. In addition, the end of the inner tube fits into the outer tube in the annular truncated cone space ■, which is located on the inner surface of the End of the outer tube has been worked out and fits exactly. When the two pipes or parts are connected and these apart are to be released, you only need to remove their ends from each other after the wire snap ring, if this has previously been used, has been withdrawn.

Further properties and design features of the connection, the subject of the present invention will appear from the following description, in which on the figure Referring to the accompanying drawing, Ee shows;

Figure 1 is an external perspective view of the end portion of a larger diameter tube and having a matching ring;

Figure 2 is an external perspective view of the end portion of the internal component of the joint;

Figure 3 is a perspective view, partially in cross section, of the two components of the connection, which are nested and secured by a ring;

FIGS. 4 + 5 show the cross section of the two end parts according to FIGS. 1 and 2;

Figure 6 is an external perspective view of the end portion of the internal component of the joint, the indented and annular ribs are provided with a helical course;

Figure 7 is a schematic perspective view, partially in cross section, of the components of the connection when the ends of the tubes have the same diameter and one on the outside of the two ends to be connected attached connection and connecting sleeve is applied.

In the figures the connection between two tubes 1 and 2 made of elastomer is shown; but it goes without saying that this Connection between a pipe or hose made of elastomer 1 and a connection or a sleeve or directly with the use apparatus can be made.

With particular reference to Figures 1-6, the tube 1 of elastomer, such as rubber or plastic, has an end I ¹ which has a larger diameter in relation to that of the tube itself, so that the diameter of the inner wall of that end I ^{1 is} slightly larger than the outer diameter of the pipe 1. The inner surface of this end I ¹ has the essential feature that it has grooves or annular recesses 3 with a fixed pitch, which is preceded by a funnel-shaped widening truncated cone part 4 and a pocket or an annular cavity 5 follows,

- «τ- a ■" ■

that of the smooth inner wall of the pipe and a lip or a truncated cone ring 6 which is fixed to the body of the tube 1 sits, is formed.

The end 2 ^{1 of} the pipe 2 to be connected, which can be smooth or spiral-shaped over the remaining length, is provided with numerous ribs 7 in addition to the annular grooves 3. The inner wall of this tube 2 may preferably be in the shape of an annular groove, as shown in FIGS. 3, 5 and 7, but it can also be smooth.

The connection is made, as can be seen in FIG. 3, in that the end 2 ^{1 is} pushed into the interior of the end 1 '. When inserting the end 2 ^{1 is} guided by the initial funnel-shaped truncated cone part 4 and continues in the end 1 'until it is clamped in the annular cavity 3, while the various ribs 7 sit in the opposing seats 3.

A special feature of the present invention is the fact that the front ribs or grooves 7, i.e. the am free end of the end part 2 ', are pressed by the truncated cone wall of the annular lip 6 against the inner wall of the pipe' 1, whereby a double seal is created.

In addition, takes the end part 1 ', when it is elastically deformed under load, also the frustoconical lip 6, with the Ribs 7 remain under pressure. This leads to a reliable tightness, both as regards the passage of the liquid also as regards the axial loosening of the two tubes. If the pressure of the liquid is not too high, e.g. if the liquid drains freely household electrical appliances are found, no further action is necessary.

However, if the pressure of the liquid is very high or the pipes have a large diameter, it is better to check the tightness by a wire snap ring 8, a tension band or the like. with circular cross-Schmitt without interruption of material that is stronger than the elastomer of which the tube 1 is made, that is adjusted with force of the connection to ensure.

-Jf-40

The ribs 7 of the end piece 2 ', which were previously indicated as being parallel to one another and perpendicular to the axis of the tube, can also, as can be seen in Figure 6, run spirally; in this case, it deforms the frustoconical lip 6 elastically and lets them rest against the corresponding annular wall of the end piece 1 ·.

Fig. 7 shows a particular embodiment of the present invention of two pipes 2a and 2b to be connected with the same diameter. In this embodiment, a sleeve 9 is used with the same two end pieces ^{1'a and 1'b, which like the end piece I 1} described above have grooves or annular depressions 3 ¹ and an annular cavity 5 ¹ , which is formed by a frustoconical lip 6'a and 6'b is limited.

The end pieces 2 "a and 2'b of the two pipes 2a and 2b, which are to be connected, are inserted into the two ends 1'a and 1'b of the sleeve 9 and pressed until the free ends of these end pieces into the corresponding cavities 5 ¹ and the various ribs 7 'engage in the recesses 3'.

After assembly, the clamping ring 8 can be placed on the sleeve 9 by applying slight pressure and preferably with easy sliding adjusted before inserting the pipes.

The invention is not bound to any particular material and its application can be to various shapes of sleeves or bends be expanded. In addition, the pipe 2 can also be the pipe connection at the inlet or outlet of the usage device.

Claims (9)

- ι claims ί 1. / pipe or hose connection, in which two connection ends, at least one of which consists of an elastomer, have matching profiled inner and outer surfaces and are to be brought into engagement axially overlapping, characterized in that the connection end (I ¹ ) is formed with an annular, axially extending pocket (5), the radially inner circumferential wall of which widens conically in the direction of insertion of the connecting end (2 ') with a smaller diameter and is dimensioned so that the axially outer wall inserted into the pocket (5) Area of the connection end (2 ¹ ) with a smaller diameter between the radially inner and radially outer wall of the pocket (5) is held under radial tension » 2. pipe or hose connection according to claim 1, characterized in that the pocket (5) radially outside of an axially to the opening of the im Diameter of the larger connecting end (I ") extending ring lip (6) is arranged with a frustoconical outer surface. 3. Pipe or hose connection according to claim 1 or 2, characterized in that the larger-diameter connection end (1 ") on the inside r-side axially in front of the pocket (5) and the connection end (2 ¹ ) with a smaller diameter are profiled at least on the outside by annular grooves (3) and annular ribs (7). 4. pipe or hose connection according to claim 3, d a characterized in that the annular grooves (3) and annular ribs (7) have a rounded shape in cross section. 5. pipe or hose connection according to claim 3 or 4, characterized in that the ribs (7) and grooves (3) have a helical pitch to have- 6. Pipe or hose connection according to one of claims 1 to 5, characterized in that the ribs (7) and grooves (3) on the outer surface of the smaller diameter connecting end (2 ') have smaller diameters than the ribs and grooves on the Inside of the connection end with a larger diameter (l ¹ ) 7. Pipe or hose connection according to one of claims 1 to 6, characterized in that the larger diameter connection end (I ¹ ) is expanded funnel-shaped on the inside in the region adjoining the opening (4). 8. pipe or hose connection according to one of claims 1 to 7, characterized in that the larger-diameter connection end (l'a; IVb) part of a Coupling sleeve with two such connection ends. 9. Pipe or hose connection according to one of claims 1 to 8, characterized in that the larger diameter connection end (I ¹ ) in the coupled state by a pipe clamp, a tensioning band (8) or the like. Is held radially compressed.