DE102016121011A1 - Pipe connection between two pipes - Google Patents

Abstract

The invention relates to a pipe connection between two pipes (1, 2), in particular between two exhaust pipes of an internal combustion engine of a motor vehicle. According to the invention, the pipe connection comprises a circumferentially closed straight connecting pipe (6) in an overlapping arrangement with the axially spaced and coaxially arranged pipe ends (3, 4) of the two pipes (1, 2). An annular gap (21) between the respective pipe end (3, 4) and the connecting pipe (6) is in each case formed by an outer jacket surface (19) of the connecting pipe (6) and / or an outer jacket surface (20) of the respective pipe end (20). 3, 4) adjacent circumferential seal (7) sealed.

Description

The invention relates to a pipe connection between two pipes, in particular between two exhaust pipes of an internal combustion engine of a motor vehicle.

Pipe connections between two pipes, in particular between two exhaust pipes of an internal combustion engine of a motor vehicle, are well known in practice. In this case, the pipe ends of the two pipes to be connected are usually connected to each other by appropriately designed pipe clamps or flanges. However, it has been shown that the pipe clamps increasingly have leaks through which the now increased, in particular legal, requirements regarding the tightness of the exhaust system are insufficient to meet. In addition, it proves to be disadvantageous in the commonly used flanges that an axial tolerance compensation between the pipes to be joined is not possible.

Such a clamp for connecting two exhaust pipes is already out of the DE 10 2010 037 318 A1 known. The pipe clamp consists of an outer shell and an inner shell, which each have a longitudinal slot, wherein the longitudinal slot of the outer shell relative to the longitudinal slot of the inner shell is arranged offset in the circumferential direction. By means arranged on the outer shell pressure clamps, a clamping force is introduced into the outer shell, which fixes the existing on the outer shell and the inner shell pipe clamp frictionally connected to the exhaust pipes.

The US 2006/0175837 A1 also already describes a device for connecting two exhaust pipes of an internal combustion engine of a motor vehicle. In this case, the pipe ends of the exhaust pipes engage in each other and in the overlap region between the two pipe ends is equipped with a seal pipe clamp. Here, the pipe ends of the exhaust pipes and equipped with the gasket pipe clamp must be arranged in a defined position or position relative to each other in order to establish a connection between the exhaust pipes can. For this purpose, the exhaust pipes in their respective end portions profilings and / or recesses, which must interlock with one another when inserted exhaust pipes. If the exhaust pipes are not arranged properly, the tightness of the connection is not guaranteed, even small distance tolerances, in particular too large distances between the pipe ends, ensure that pipe connections have leaks.

Against this background, the present invention seeks to provide a gas-tight pipe connection available by means of which simultaneously axial distance tolerances between the pipe ends can be compensated for the connecting pipes.

This object is achieved with a pipe joint according to the features of claim 1. The respective subclaims relate to particularly expedient developments of the invention.

According to the invention a pipe connection between two pipes, in particular between two exhaust pipes of an internal combustion engine of a motor vehicle is provided with a circumferentially closed straight connecting pipe in overlapping arrangement with the axially spaced and coaxially arranged pipe ends of the two tubes, wherein an annular gap between the respective pipe end and the connecting tube is sealed in each case by a voltage applied to an outer circumferential surface of the connecting tube and / or on an outer circumferential surface of the respective tube end circumferential seal. As a result, a gas-tight pipe connection between two pipes without leaks is provided, which is easy and inexpensive to install. In addition, by means of the straight connecting pipe and the associated seals and a resulting variable overlap region between the connecting pipe and the respective pipe ends, spacing tolerances between the pipe ends can be compensated without causing leaks in the pipe joint. As a result, the tightness of the pipe connection is ensured even with different axial distances between the two pipe ends of the pipes to be joined. Preferably, the connecting pipe is made of the same material as the pipe ends or pipes to be connected, in particular of a suitable steel, so that the connecting pipe and the pipe ends have the same coefficient of thermal expansion. The seal preferably consists of one, in particular elastically, deformable graphite. The pipe connection according to the invention can be used in exhaust systems of motor vehicles and wherever, especially hot, media or fluids are passed through pipes. Examples include power plants, swimming pools, heating systems, etc. called.

For fixing the connecting tube and the seal at the tube ends, a tubular outer shell having at least one longitudinal slot is provided, which encloses the connecting tube, the seals and the two tube ends, wherein the outer shell can be fixed by reducing the diameter at the tube ends. hereby it is ensured that the connecting tube and the seals are arranged in a defined position relative to the tube ends or to the annular gap between the connecting tube and the respective tube ends. The over the entire axial length of the outer shell extending and formed as a continuous gap longitudinal slot in the outer shell ensures the mountability of the outer shell to be connected pipe ends, as well as to the connecting pipe and the seals. At the same time, a reduction in the diameter of the outer shell, in which the dimensions of the longitudinal slot are reduced, ensures a reliable fixing of the outer shell to the tube ends and a defined arrangement of the seals in the region of the annular gap between the connecting tube and the respective tube end. Preferably, the outer shell is formed as a bent steel sheet.

An alternative embodiment of the outer shell, however, provides that the longitudinal slot is formed as an overlap slot. In this case, the end portions of the outer shell overlap, wherein in a diameter reduction for fixing the outer shell at the pipe ends, an overlap region is increased.

Another modified embodiment of the invention provides that the outer shell has two or more longitudinal slots. The outer shell is thus formed in two or more parts and consists of a plurality of segments which are fixable together at the tube ends and together enclose the connecting tube and the seals.

It is also provided that the outer shell has a connecting portion surrounding the central portion, two provided for fixing to the respective pipe ends outer portions and two extending between the central portion and the outer portions, the seals enclosing sealing portions. In this case, the diameter in the outer sections is matched to the diameter of the pipe ends to be connected, in the sealing sections to the outer diameter of the seals and in the middle section to the diameter of the connecting pipe, so that the outer shell has several gradations. By dividing the outer shell into different sections, it is ensured that the seals are arranged in the force shunt, ie are not arranged in the sections in which the fixing of the outer shell to the pipe ends is provided.

To ensure a process-reliable fixation of the outer shell at the pipe ends, the two outer sections of the outer shell and the respective pipe ends are non-positively connectable to each other, wherein the non-positive connection between the outer portions of the outer shell and the respective pipe ends by a respective outer portion encompassing pipe clamp. By operating the pipe clamps, the inner diameter of the pipe clamps and thereby also the diameter of the outer portions of the outer shell is successively reduced until a process-safe frictional connection is formed.

A particularly advantageous embodiment of the invention is also achieved in that the sealing portions of the outer shell each have a chamber for receiving the peripheral seal, wherein the chamber is configured such that a reduction in the diameter of the outer shell leads to a reduction of the volume of the chamber. As a result, the seals are deformed or shifted so that they come to rest against the transition between the straight pipe and the respective pipe ends and thereby seal the annular gap. The sealing effect is enhanced by the fact that the seals are pressed in this transition with a defined force against the outer surface of the connecting tube and the outer surface of the respective pipe end.

Furthermore, it proves to be particularly expedient that the central portion of the outer shell encloses an overlap region between the connecting tube and the tube ends without contact. By a circumferential annular space between the central portion of the outer shell and the overlap region a conditioning of the central portion of the outer shell is prevented at the connecting pipe or at the pipe ends in the overlapping region. This ensures that a clamping action of the pipe clamps optimally acts on the pipe ends to be connected and thus optimum force and torque transmission between the pipe ends or pipes to be joined and the outer shell takes place.

Another feature of the invention is that the connecting tube, the seals, the outer shell and the pipe clamps form a preassemblable and jointly manageable connection element. The seals, the connecting pipe and the pipe clamps are, in particular captive integrated in the integrally formed outer shell or fixed to this, so that the connecting element for producing the pipe joint can be arranged as a structural unit between the pipe ends to be connected. As a result, a simple reliable assembly of the connecting element is made possible. At the same time the assembly time for the production of the gas-tight pipe connection is optimized.

In this case, it proves to be particularly appropriate that the pipe ends to be joined in each case engage in the connecting pipe. As a result, the assembly of the connecting element or the production of the pipe connection is substantially simplified. The pipe ends must be inserted during assembly in the enclosed by the outer shell connecting pipe, so that an overlap region between the respective pipe end and the connecting pipe is formed. Of course, it can also be provided in an alternative embodiment that the connecting tube engages in the respective pipe ends.

A further modified embodiment of the pipe connection according to the invention is also provided in that the connecting pipe is fixed by a respective flange connection, in particular non-positively, at the respective pipe end.

In this case, a first flange of the respective flange is fixed to the connecting tube and a second flange of the flange each fixed to a longitudinal slot having a tubular outer shell, wherein the respective outer shell longitudinally slidably engages around the respective tube end and can be fixed by reducing the diameter at the respective tube end. The fixation of the first flange on the connecting tube and the second flange on the respective outer shell takes place, for example, by a welded connection. Due to the longitudinal displaceability of the outer shell on the respective tube end, the second flanges can be moved continuously on the respective tube end and fixed in the desired position relative to the first flange of the connecting tube, so that distance tolerances between the tube ends can be compensated. The fixing of the respective outer shell to the pipe ends is non-positively by a the outer shell on the outside encompassing pipe clamp.

An advantageous embodiment of the invention is also achieved in that in each case a seal is arranged in a chamber between the flanges to be connected of the respective flange, wherein the seal and the chamber are configured and arranged such that a production of frictional flange to reduce a Volume of the chamber leads. The frictional flange is generated by one or more both flanges by cross, for example, as screws, formed fastening means, wherein the seal is arranged in the force shunt. Due to the volume reduction of the chambers arranged in this seals are deformed or shifted so that they come to rest on the lateral surface of the respective pipe ends and seal the annular gap between the connecting pipe and the respective pipe end gas-tight. The sealing effect is enhanced by the fact that the seals are pressed with a defined force against the outer surface of the pipe ends.

• 1 eine erste Ausführungsform einer Rohrverbindung zwischen zwei Rohren in einer Prinzipdarstellung;
• 2 eine zweite Ausführungsform einer Rohrverbindung zwischen zwei Rohren in einer Prinzipdarstellung.

The invention allows numerous embodiments. To further clarify its basic principle, one of which is shown in the drawing and will be described below. This shows in

• 1 a first embodiment of a pipe joint between two tubes in a schematic representation;
• 2 a second embodiment of a pipe joint between two pipes in a schematic diagram.

1 shows a first embodiment of a gas-tight pipe connection between two pipes 1 . 2 , in particular between two exhaust pipes of an internal combustion engine of a motor vehicle. The pipe ends 3 . 4 the coaxially arranged tubes 1 . 2 are with a connecting element 5 connected in a gastight manner.

The pre-assembled and jointly handled assembly existing connection element 5 includes a rigid, circumferentially closed and straight connecting pipe 6 , two circumferential seals 7 , a one-piece tubular outer shell 8th , as well as two pipe clamps 9 ,

The tubular outer shell 8th has a longitudinal slot 10 on and surrounds the connecting pipe 6 and the two seals 7 while the clamps 9 the outer shell 8th enclose. The connecting pipe 6 and the seals 7 So are inside the outer shell 8th arranged or fixed in this. The outer shell 8th includes a connecting pipe 6 enclosing middle section 11 , two for fixing at the respective pipe ends 3 . 4 provided outside sections 12 and two between the middle section 11 and the two outer sections 12 extending sealing sections 13 ,

In the area of the outer sections 12 are the clamps 9 captive on the outer shell 8th arranged and embrace this outside. In the area of the sealing sections 13 has the outer shell 8th circulating chambers 14 on, in which the seals 7 are inserted.

To produce the pipe connection according to the invention, the pipe ends 3 . 4 the pipes 1 , 2 and the connecting element 5 moved and arranged relative to each other so that an overlapping arrangement between the connecting pipe 6 and the two pipe ends to be connected 3 . 4 formed. This will be the pipe ends 3 . 4 in the connecting pipe 6 pushed in, and Although such that between the respective pipe end 3 . 4 and the surrounding connection tube 6 an overlap area 15 and that is between the end faces 16 the pipe ends 3 . 4 an axial distance 17 formed. The axial distance 17 should be chosen such that the in the connecting pipe 6 engaging or projecting pipe ends 3 . 4 do not touch. This allows axial distance tolerances between the pipe ends 3 . 4 the pipes 1 . 2 be compensated.

Subsequently, a diameter 18 or a clear width of the outer shell 8th through the in the outer sections 12 the outer shell 8th arranged clamps 9 reduced. The reduction of the diameter 18 gets through in the outer shell 8th provided longitudinal slot 10 allows. In the area of the outer sections 12 becomes the outer shell 8th from the clamps 9 non-positively at the pipe ends 3 . 4 fixed. At the same time leads to a reduction of the diameter 18 the outer shell 8th also to reduce the volume of the seals 7 receiving chambers 14 in the sealing sections 13 , The volume of the chamber 14 or the cross section of the seals 7 is designed so that the seals 7 by changing the volume of the chambers 14 to an outer lateral surface 19 of the connecting pipe 6 and on an outer lateral surface 20 of the respective pipe end 3 . 4 create, so that an annular gap 21 between the respective pipe end 3 . 4 and the connecting pipe 6 each by a circumferential seal 7 is sealed gas-tight. Here are the two seals 7 arranged in the force shunt and be with a defined force to the lateral surfaces 19 . 20 pressed.

According to the invention, it is provided that the middle section 11 the outer shell 8th the connecting pipe 6 encloses contactless, so that a circumferential annular space 22 between the connecting pipe 6 and the outer shell 8th in the area of the middle section 11 formed. Because of the middle section 11 the outer shell 8th not on the connecting pipe 6 comes to rest, it is ensured that the clamping effect of the pipe clamps 9 optimal on the pipe ends to be connected 3 . 4 acts and thus optimal force and torque transmission between the pipe ends to be connected 3 . 4 or pipes 1 . 2 through the connecting element 5 he follows.

An alternative embodiment of the pipe connection according to the invention between two pipe ends 3 . 4 is in 2 shown. The respective pipe ends 3 . 4 are in the circumferentially closed straight connecting pipe 6 inserted, so that this in overlapping arrangement with the two pipe ends 3 . 4 located. The two pipe ends 3 . 4 enclosing connecting pipe 6 is by a respective flange connection 23 at the respective pipe end 3 . 4 is fixed. It is at the opposite end portions of the connecting pipe 6 each a first flange 24 in particular fixed by a welded joint. A second flange 25 the respective flange connection 23 is each on an outer shell 26 fixed, which in each case one of the two pipe ends 3 . 4 embrace. The two outer shells 26 each have a longitudinal slot 27 on and are longitudinally displaceable on the respective pipe end 3 . 4 arranged. The longitudinal slot 27 in the outer shells 26 can go up through the respective second flange 25 pass through. Through the outer shells 26 encompassing pipe clamps 28 can the diameter 29 the outer shells 26 be reduced so that the respective outer shells 26 independently frictionally in the desired positions at the respective pipe end 3 . 4 can be fixed. Here are the outer shells 26 such at the respective pipe end 3 . 4 fixed that the two flanges 24 . 25 the respective flange connections 23 abut each other and that between the facing end faces 30 the pipe ends 3 . 4 an axial distance 31 formed. The axial distance 31 should be chosen such that the two end faces 30 the pipe ends 3 . 4 do not touch. Between the two adjacent flanges 24 . 25 the flange connections 23 each forms a circumferential chamber 32 out, in each of which a seal 7 is arranged. The chamber 32 is by a circumferential recess 33 in the first flange 24 and one of this recess 33 opposite wall surface 34 of the second flange 25 educated.

For the production of the flange connection 23 become the two adjacent flanges 24 . 25 each by one or more in 2 by dashed lines only indicated fasteners 35 positively connected with each other. Here are the chamber 32 and the seal 7 between the flanges 24 , 25 arranged in the force shunt and configured such that in the manufacture of the flange connection 23 for reducing the volume of the respective chamber 32 comes. This is where the seals come from 7 each for engagement with an outer circumferential surface 20 of the respective pipe end 3 . 4 and close an annular gap 21 between the connecting pipe 6 and the respective pipe end 3 . 4 gas-tight.

LIST OF REFERENCE NUMBERS

1

pipe

2

pipe

3

pipe end

4

pipe end

5

connecting member

6

connecting pipe

7

poetry

8th

outer shell

9

pipe clamp

10

longitudinal slot

11

midsection

12

outer portion

13

sealing portion

14

chamber

15

overlap area

16

front

17

distance

18

diameter

19

Lateral surface connecting pipe

20

Lateral surface pipe end

21

annular gap

22

free space

23

flange

24

first flange

25

second flange

26

outer shell

27

longitudinal slot

28

pipe clamp

29

diameter

30

front

31

distance

32

chamber

33

recess

34

wall surface

35

fastener

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102010037318 A1 [0003]
• US 2006/0175837 A1 [0004]

Claims (15)

Pipe connection between two pipes (1, 2), in particular between two exhaust pipes of an internal combustion engine of a motor vehicle, with a circumferentially closed straight connecting pipe (6) in overlapping arrangement with the axially spaced and coaxially arranged pipe ends (3, 4) of the two pipes (1, 2), wherein an annular gap (21) between the respective tube end (3, 4) and the connecting tube (6) in each case by an outer jacket surface (19) of the connecting tube (6) and / or on an outer lateral surface ( 20) of the respective pipe end (3, 4) adjacent circumferential seal (7) is sealed. Pipe connection to Claim 1 characterized by at least one longitudinal slot (10) having tubular outer shell (8), which surrounds the connecting tube (6), the seals (7) and the two pipe ends (3, 4), wherein the outer shell (8) by a reduction the diameter (18) at the pipe ends (3, 4) is fixable. Pipe connection according to claims 1 or 2, characterized in that the longitudinal slot (10) is designed as a lap slot. Pipe connection according to at least one of the preceding claims, characterized in that the outer shell (8) has two or more longitudinal slots (10). Pipe connection according to at least one of the preceding claims, characterized in that the outer shell (8) a the connecting tube (6) enclosing the central portion (11), two for fixing to the respective pipe ends (3, 4) provided outer portions (12) and two between Having the central portion (11) and the outer portions (12) extending, the seals (7) enclosing sealing portions (13). Pipe connection according to at least one of the preceding claims, characterized in that the two outer sections (12) of the outer shell (8) and the respective pipe ends (3, 4) are non-positively connectable to each other. Pipe connection according to at least one of the preceding claims, characterized in that the frictional connection between the outer sections (12) of the outer shell (8) and the respective pipe ends (3, 4) by a respective outer portion (12) encompassing pipe clamp (9). Pipe connection according to at least one of the preceding claims, characterized in that the sealing portions (13) of the outer shell (8) each have a chamber (14) for receiving the peripheral seal (7), wherein the chamber (14) is designed such that a Reducing the diameter (18) of the outer shell (8) leads to a reduction of the volume of the chamber (14). Pipe connection according to at least one of the preceding claims, characterized in that the middle section (11) of the outer shell (8) encloses an overlapping area (15) between the connecting pipe (6) and the pipe ends (3, 4) without contact. Pipe connection according to at least one of the preceding claims, characterized in that the connecting pipe (6), the seals (7), the outer shell (8) and the pipe clamps (9) form a preassemblable and jointly manageable connecting element (5). Pipe connection according to at least one of the preceding claims, characterized in that the pipe ends (3, 4) to be connected in each case engage in the connecting pipe (6). Pipe connection according to at least one of the preceding claims, characterized in that the connecting pipe (6) is fixed by a respective flange connection (23) to the respective pipe end (3, 4). Pipe connection to Claim 1 characterized in that a first flange (24) of the respective flange connection (23) is fixed to the connection pipe (26) and a second flange (25) of the flange connection (23) is in each case attached to a tubular outer shell (26) having a longitudinal slot (27) ), wherein the respective outer shell (26) the respective tube end (3, 4) engages longitudinally displaceable and by a reduction of the diameter (29) at the respective tube end (3, 4) is fixable. Pipe connection to Claim 13 , characterized in that the respective outer shell (26) by a pipe clamp (28) non-positively on the respective pipe end (3, 4) is fixable. Pipe connection according to at least one of Claims 13 and 14 , characterized in that in each case a seal (7) in a chamber (32) between the flanges to be connected (24, 25) of the respective flange (23) is arranged, wherein the seal (7) and the chamber (32) configured and arranged that a production of the non-positive flange connection (23) leads to a reduction of a volume of the chamber (32).

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