DE8223557U1 - Clamp connection for smooth round bodies, especially pipes and rods - Google Patents

Description

■ · ft ·· ·· ■ ·

I Al ElNlAiNWALiL. DIETRICH LEWINSKY HclNZ-JOACHIM HUBER REINER PRIETSCH MDNCHEN 21

GOTTHARDSTR. 81 2O.Augu _S t 1982

GEORG FISCHER AKTIENGESELLSCHAF T, 8201 Schaffhausen 2307 / FIT / August 12, 1982 / Li-ba /

Clamp connection for smooth round bodies, especially pipes and rods

The invention relates to a clamp connection according to the preamble of the claim

When laying pipes but also rods, these are usually connected to one another via a union nut screwed.

This design has the disadvantage that each Rohrbzw. Rod ends often threaded in place must be provided, which is cumbersome at assembly points that are difficult to access, possibly without an electrical connection is.

In an existing embodiment (DE-OS 28 35 274) this problem is solved in that the tubes in a Sleeve placed and then clamped together in the radial direction by pressing.

This solution has the disadvantage that the pipe or

Rod connections can only withstand a 'limited mechanical load. The radially uneven one Loading of the pipe seal impairs its function, so that leaks / especially at higher Medium pressures can arise.

Another disadvantage of this design is that the mechanical strength is difficult or not at all can be increased because the cutting action of the clamping body can destroy the pipe wall or that The moment of resistance of the pipe against a rotational movement over more than 90 is practically prevented.

The object of the present invention is to create a clamping connection for smooth round bodies, in particular Tubes and rods that do not have the disadvantages of existing designs.

The solution sought should ensure a mechanically very strong connection that is also very high Can withstand pressures.

It is also a solution with a steadily increasing resistance to pressure being exerted on the To look for clamp bodies.

So that the function of the seal is not impaired, its symmetrical loading is also in the to ensure created clamp connection. 30th

This task is according to the invention with the teaching according to the characterizing features of claim 1

solved.

Embodiments of this teaching are in the further, dependent claims circumscribed. 5

The solution described is characterized by high mechanical strength and, in the case of pipes, by absolute Tightness, even with high medium pressures.

The pipe or rod connection can be produced quickly, easily and inexpensively.

If necessary, the connection can be easily released, using the connecting members again can be.

An exemplary embodiment of the clamp connection according to the invention is explained in more detail below with reference to the drawing.
20th

Show it:

Fig. 1 is a longitudinal section through the one

Half of a pipe clamp connection, 25

FIG. 2 shows a detail II from FIG. 1,

however, according to a modified embodiment, and

FIG. 3 shows a variant of FIG. 1.

In Fig. 1 two pipe ends 1, 2 and a thread

C t

-A-

Tube body 3, a screw body 4, preferably one Union nut 4, a seal 5 and a grip ring 6 shown. To connect the second tube 2, the tubular body 3 is designed symmetrically, wherein another union nut and a gripping ring are provided in the part of the clamp connection, not shown are.

To produce the clamping connection, first the union nut 4 and then the gripping ring 6 are pushed onto the first tube 1. The pipe body 3 is then pushed onto the pipe 1 until the entire seal 5 rests against the outer surface of the pipe.
15th

To ensure that the pipe body 3 is of the correct length at least up to line 7 on the The first tube 1 is pushed on, a color marking or the like for this purpose on the tube 1 can be arranged.

The gripping ring 6 is preferably made of spring steel and is dimensioned so that it is against the outer surface of the pipe 1 or 2 is in a form-fitting manner. The grip ring 6 is not completely closed but has a Gap so that it can be pressed together when compressed during the clamping process. This However, the gap can also run obliquely to the plane of the ring, so that the two ends of the not closed Overlap each other.

When the parts 3 to 6 are arranged on the pipe 1,

the union nut is brought into engagement with an external thread 8 on the tubular body 3 and tightened. As a result, the gripping ring 6 is pressed against a projection on the tubular body 3. At the same time one presses frustoconical surface 10 on the inside of the union nut 4 the gripping ring 6 radially inwards, The radial inner section of the gripping ring 6 has three sharp edges 11, which are located in the outer surface of pipe 1 or 2, so that a solid pipe connection is created that can withstand high medium pressures.

Instead of the three edges 11 shown, two j

or more than three can be provided. The Anj

number of edges 11 is e.g. from the used \

Materials as well as the intended load. Instead of the round starting cross-section & 2S gripping ring, it is also possible, for example, to use a ring with a frustoconical outer surface which rests against the surface 10. The version shown is a particularly inexpensive choice. Starting from a wire, the two grooves 12 between the edges 11 can be produced very inexpensively.

The seal 5 can, under certain circumstances, be omitted entirely if the grip ring 6 is designed accordingly and no flowable medium is used. In addition, the seal can be pressed together in such a way that that an absolutely pressure-independent seal is created. The dashed line shows the cross-sectional shape of the seal 5 before the tube 1 is pushed in.

^ jfcyfok sfes. ' β.ζ * ζ £}

In Fig. 2, a slightly modified embodiment of the clamp connection is shown. In this embodiment, the tubular body 3 is provided radially on the inside with a circular extension 14, the inner radius of which corresponds to that of the tube 1, 2. The circular surface 15 can bear against the end face of the tube 1, 2 . This approach 14 serves, among other things, for the correct positioning of the tubular body 3.

When assembling the connection, it is also possible to use parts 2, 4, 5 and 6 as an assembled unit to push on the round body 1/2, with the grip ring 6 is biased radially outward, e.g. by means of spring force. To manufacture the The union nut 4 now only has to be tightened.

In Fig. 3 an embodiment is shown in which the screw body as a ring 21 with an external thread 23 is formed, which engages in an internal thread 27 on the tubular body 24. When screwing in the Ring 21 in the raw body 24 is the gripping ring 26, which rests on the outside against the frustoconical surface 10 on the ring 21, in the outer surface of the tube or pipe end 1 pressed in, as in connection with this with Fig. 1 was described.

In order to increase the force on the cutting edge or edge 11, only two are available, opposite one another three in the embodiment according to FIG. 1.

In order to improve the seal, the sealing

till ItII IIII
■ · I

til I · · ·

I 11 111 I ■

a »ii ii ill)

" ⁷ "

device 25 provided on the cross-sectional circumference with a large number of indentations. When pressing the Seal against the outer surface of the pipes 1, 2 thereby a large number of points of contact between the seal and the one to be sealed Surfaces. As a result, the effect of this seal 25 compared to that in Fig. 1 is greatly increased.

The cross-sectional shape of the seal before insertion of the pipe 1 is represented by the line 20. The seal has two tongues 30 on the inside which are pressed against this when the tube 1 is pushed in. So that these tongues 30 do not get stuck between the pipe body 24 and the pipe 1, the wall 29 runs obliquely to the pipe axis, so that a space for receiving the tongues 30 is created.

On the radially outer surface of the seal 25, grooves 31 are provided which run in the circumferential direction of the seal 25 .

The ring 21 is designed at the outer end, e.g. as a castle nut, with regular projections 22 are interrupted by incisions. To tighten the ring 21 is a perpendicular in this embodiment Loose tool used to attach to the pipe axis, which is ashed with at right angles attached to it pegs, which in the incisions between the projections 22 intervene. The pins are expediently arranged on a semicircular plate, which when screwing against the tube 1 serving as a guide. This guidance facilitates or accelerates connecting pipes 1 and 2.

. ·· "·· •» •• IllltlllllJItl

I I <(I <<· »· III ■ I I I I · ·

• ·

tic

- 8th -

Instead of the crown shape, however, the outer end of the ring 21 can also have other shapes, e.g. normal Nut shape or other shape, which ensures quick screwing. 5

The designs shown can be used in particular for tubes, but also for rods. the individual parts 3 to 6 or 21, 24, 25, 26 are relatively inexpensive to manufacture in large numbers. Above all, it is important that there are no threads on pipes or rods at the assembly point must be attached.

Claims (10)

r- ■ t claims 2307 / FIT 1. Clamp connection for smooth round bodies, in particular Tubes or rods, with a threaded tubular body and a screw body, characterized that between the round body (1, 2), a frusto-conical inner surface (10) of the Screw body (4, 21) and a stop (9) on the tubular body (3, 24) a gripping ring (6, 26) is arranged is, on its radially inwardly directed surface section edges (11) to Has clamping into the outer surface of the round body (1). 2. Clamping connection for pipes according to claim 1, characterized in that the pipe body (3, 24) has a circular extension (14) extending up to the inner wall of the pipe, which as Stop between the tubes (1, 2) is used. 3. Clamping connection according to claim 1, characterized in that that the gripping ring (6, 26) is a wire, on the radial inside at least C rr ^ * - 10 a groove (12) is incorporated. I. 4. Clamping connection for pipes according to claim 1, characterized in that a seal (5 ₇ 25) I 5 in an annular, from the screwing space I separate recess on the inner surface of the * Tubular body (3, 24) is arranged. 5. Clamping connection according to claim 4, characterized marked-10 shows that the seal (5, 25) can be pressed together by pushing in the tube (1, 2). r 6. Clamping connection according to claim 1, characterized in that that the screw body is an Ueber-15 nut (4), which is in an external thread (8) engages the tubular body (3) (Fig. 1). 7. Clamping connection according to claim 1, characterized in that the screw body is a ring (21) '< 20 with an external thread (23) which is inserted into an internal . thread (27) of the tubular body (24) engages (Fig. 3). 8. Clamping connection according to claim 7, characterized in that the outer end (22) of the ring (21) is designed like a crown to accommodate a socket wrench, for which the round body (1, 2) serves as a guide. 30th 9. Clamping connection according to claim 5, characterized marked ¹ characterized in that the seal (25) along two pressable tongues resting against the tube (1) ι. - 11 (30) (Fig. 3). 10. Clamping connection according to claim 5, characterized / that the against the inner wall of the Tubular body (24) adjacent surface of the seal (25) in axial section is undulating (31) (Fig. 3).