DE19500952C1 - Arcuate tube section for replaceable arrangement in piping used for hydraulic or pneumatic conveying of solid materials - Google Patents

Abstract

The section (1) has a jacket tube (2) welded between end coupling flanges (6), and an abrasion-resistant inner split fitting with radial clearance (A) from it. The fitting is formed from at least one outer dish segment (15) of semicircular cross-section in the centre (14) of the curve, stressed between the coupling flanges. The centre line (16) of the outer dish segment extends along the central longitudinal plane in the direction of the longitudinal axis (17). There is an inner dish segment (21) of semicircular cross-section with a radial clearance from the jacket tube. The wall thickness of the inner segment is less than that of the outer one.

Description

The invention relates to a pipe bend for interchangeable Integration into a hydraulic or pneumatic pipe transport for solids according to the features in the preamble of claim 1.

Such a pipe bend counts through DE 40 10 556 C2 the state of the art. It consists of a ver wear-resistant casing, from which the casing is reversed pipe made of weldable steel and end side coupling flanges together with the jacket pipe are welded. The outer diameter of the chuck tubes and the inner diameter of the jacket tube are the Art coordinated that the casing and the Jacket tube can be inserted into each other without deformation can. The fact that the casing is only between the coupling flanges is clamped, the Areas between the casing pipe and the casing pipe with  add to the transported solid. To this The casing pipe is inserted into the casing pipe or in this manner pressure equalization layer formed by the solid almost embedded.

When transporting solids it is the curvature area of the lining facing away from the pipe bend tubes almost exclusively from friction wear puts. In order to increase the service life of the pipe bend zen, it would be conceivable that the material wears out firmer casing with different circumferences To provide wall thicknesses and the wear volume in the we noticeably in the center away from the center of curvature Focus circumferential area. This thought can ever but can only be put into practice to a limited extent because Especially significant with a cast iron casing Difficulty pouring when larger Un Differences exist in the wall thicknesses.

In the scope of DE 35 10 840 A1 is a manifold for pneumatic conveying lines, especially for underground Blow displacement lines, known from having a housing end flanges. In the flanges Wear rings embedded. Owns between the flanges the housing both on the radially inner circumference also closable on the radially outer circumference Openings. Over the lying on the radially outer circumference Opening can be curved when the cover is removed Wear insert and with the help of a lid assigned bolt after fixing the position Lids are attached as intended.

The invention is based on the prior art The task is to create a pipe bend that also with strongly abrasive solids a noticeably longer one Has service life.

According to the invention, this object is achieved in those listed in the characterizing part of claim 1 Characteristics.

After that, the center of curvature of the Circumferential area facing away from the pipe bend only one outer shell segment with radial distance to the jacket arranged tube and between the coupling flanges curious; excited. Such a shell segment has a semicircle shaped cross section, with the thigh end faces extend in a plane through the longitudinal axis of the Transport cross-section runs and to the curvature  point is arranged vertically. This shell segment can now be targeted in all areas with one respective application and the expected ver wear matched optimal wall thickness. Since there are no major differences in wall thickness ten, the shell segment can comparatively easily manufactured, in particular cast. It can the total weight of the shell segment is kept that the permissible maximum weight of the pipe bend, esp especially when it is incorporated into a pipe run of a vehicle concrete conveyor (truck-mounted concrete pump) is not exceeded becomes.

To the extent of FR-PS 11 35 039 it is known ver more wear-resistant shell segments in the Mitmitungsmit telpunkt of a pipe bend facing peripheral area assign. For this, however, a specially trained Jacket tube with one-piece end coupling lungs flanges used. It also requires entry Change the shell segments of an assembly opening in the Area of the shell segments oval tube bend.

The invention allows in principle that only in the circumferential area facing away from the center of curvature of the pipe bend a shell segment or possibly several Shell segments are provided one behind the other. By doing the circumferential region facing the center of curvature ge is actually sufficient for purely technical reasons the casing tube. However, in order to ensure that the Ver increase wear resistance without significant effort, is in accordance with the features of claim 2 Neren shell segment semicircular cross section seen. This inner shell segment is supported his thigh faces on the thigh faces of the outer shell segment and forms together with this a casing pipe in the casing pipe. The inner shell segment  can be provided with a minimal wall thickness. It can be made of cast iron or steel. In the Manufacturing from steel can be done, for example, by cutting of a closed arcuate steel tube or are generated by pressing or forging technology. It lies at a radial distance from the casing tube.

For a pipe bend with at least one outer shell it will segment according to the features of the claim 3 regarded as advantageous that the end faces of the Casing tube and the outer shell segment each in extend the same transverse planes and the coupling flanges have inner wear rings. While the one weldable steel existing outer layers of the coupling flanges by means of overlapping ends of the casing tube Welded sockets are welded, butt the end faces of the shell segment on the inner end faces of the outside and the wear rings of the coupling flanges. The Wear rings have wear resistance, that of the service life of the outer shell segment largely is adjusted.

Comes in the um facing away from the center of curvature at least one outer shell lens segment for use, so it is according to claim 4 an advantage if the wear rings in the Circumference region facing away from the center of curvature greater wall thickness than in the center of curvature have facing circumferential area. Here, the Wall thickness of the wear rings specifically the wall thickness of the Shell segments in the inlet and outlet area or the Jacket tube are adjusted.

In the case of the embodiment of claim 5 extend the end faces of the outer as well as the in nere shell segments in the same transverse planes, where the  Face of the casing tube to the two-layer coupling flanges. The outer layers of the coupling flanges are ver with the outer surface of the casing tube welds. In this case, the wear rings have over a uniform wall thickness over the entire circumference.

In the embodiment characterized in claim 6 the core of the invention is that on the outlet side End of the pipe bend both the outer shell segment as also the inner shell segment which only has one layer here and the coupling flange welded to the casing tube grasp. The end faces of the shell segments are blue fen then in a transverse plane with the face of the dome flange. The axial position of the shell segments is ensured at the inlet end that their faces against the inner faces of a two-layer coupling flange while pushing out the shell-side end of the shell-side end jumps, for example in the form of cams or sweat score, own that on the inside of the single layer Coupling flange get to the system. With this out the outlet ends of the Scha lens segments, especially the outer shell segment, so to speak the function of a wear ring.

For fixing the position of the outer shell segment in the jacket pipe, especially during assembly and up to formation a pressure compensation layer between the shell segment and the jacket tube, it can be advantageous according to claim 7 be, the outer shell segment with circumferential front jumps, for example in the form of part with the wall leaden cams to equip that on the inner surface of the jacket pipe can get to the system. Especially can end of the shell segment and in the middle such projections may be provided. But it is conceivable  also that in other lengths such jumps are provided.

According to claim 8, it is also in the inner shell ment imaginable, this end, in the longitudinal center or in other length sections facing the casing pipe Allocate tabs located on the inner surface can support the jacket tube.

The invention is based on in the drawings gene illustrated embodiments explained in more detail. Show it:

Figure 1 in longitudinal section a pipe bend.

FIG. 2 shows an end view of the pipe bend of FIG. 1 according to arrow II;

3 shows a cross section through the bent pipe of Figure 1 along the line III-III..;

Fig. 4 to 9 different stages in the manufacture of the pipe bend of Fig. 1;

Fig. 10 to 13 in longitudinal section, four men Ausführungsfor a pipe bend, and

Fig. 14 is an end view of the tube sheet of FIG. 13 according to the arrow XIV.

With 1 in FIGS. 1 to 3 and 9, a pipe bend is distinguished, which can be incorporated into an otherwise not shown pipe string for the hydraulic transport of a solid material, in particular concrete.

The pipe bend 1 has (see FIGS. 1 to 3) a cylindrical jacket tube 2 made of a weldable steel and extending over an angle of 90 °. The wall thickness D of the casing tube 2 is the same everywhere.

At the ends 3 , 4 , the jacket tube 2 is welded by 5 overlapping two coupling flanges 6 , which serve the releasable connection with adjacent straight or curved transport pipes. The coupling flanges 6 each have an outer layer 7 made of weldable steel and inner wear rings 8 made of a material which is more wear-resistant than the material of the outer layers 7 . The end faces 9 , 10 of the outer layers 7 and the wear rings 8 each extend in the same perpendicular to each other standing planes EE.

The outer layers 7 of the coupling flanges 6 are composed of end-face annular collars 11 , adjacent coupling grooves 12 and the weld-on socket 5 , which are welded to the outer surface 13 of the tubular casing 2 .

In the area of the pipe bend 1 facing away from the center of curvature 14, an outer shell segment 15 extends between the coupling flanges 6 and has a semicircular cross-section with a radial distance A from the tubular casing 2 . The sides of the thigh end 16 facing the center of curvature 14 of the outer shell segment 15 extend in the longitudinal longitudinal axis 17 of the circular transport cross section TQ, which extends to the center of curvature 14 perpendicular to the longitudinal median plane ME-ME.

The outer shell segment 15 has an initially increasing and then decreasing wall thickness D1. It has from the outer surface 18 in one piece from standing cam-like projections 19 which can come to rest on the inner surface 20 of the casing tube 2 . As a result, the outer shell segment 15 is at a predetermined distance A from the casing tube 2 .

As give further to see FIGS. 1 to 3 and 9, in which a clamped between the coupling flanges 6 inner shell segment seen the center of curvature 14 of the bent pipe 1 facing portion 21 semi-circular cross-section in the radial distance Al to the casing tube 2 before. Its leg end faces 22 also extend in the central longitudinal plane ME-ME that extends in the longitudinal axis 17 of the transport cross section TQ and is perpendicular to the center of curvature 14 . The wall thickness D2 of the inner shell segment 21 is significantly less than the smallest wall thickness D1 of the outer shell segment 15 be measure.

The material of the outer shell segment 15 is cast iron, while the material of the inner shell segment 21 is a weldable steel, such as. B. St 37.

Still see Figs. 1 and can 9, 21 that a lumpy projections 24 collar from the outer surface 23 of the inner shell segment in the direction of the casing tube 2 before. These projections 24 can be supported on the inner surface 20 of the casing tube 2 .

. In the manufacture of the pipe bend 1 of Figure 1 and 9 as the procedure follows (see Figures 4 to 9.):
First, the arcuate jacket tube 2 is formed ( Fig. 4). Is in this casing tube 2 is then as shown in FIG. 5 inserted, the outer shell segment 15 until the end faces 25 and 26 of casing 2 and outer Schalenseg element 15 lie in the same transverse plane respectively EI-EI. Subsequently, Fig also the inner shell segment 21 accordingly. 6 inserted into the casing tube 2, again so far are to its end faces 27 in each weils a transverse plane E1-E1.

Now, as can be seen from FIG. 7, a coupling flange 6 is tacked to one end 3 of the casing tube 2 and then, according to FIG. 8, the second coupling flange 6 is tacked to the other end 4 of the casing tube 2 .

Ultimately, according to FIG. 9, the coupling flanges 6 are welded to the outer upper surface 13 of the casing tube 2 via the welded socket 5 .

The embodiment of the pipe bend 1 a of FIG. 10 differs from that of FIGS. 1 and 9 in that instead of a one-piece outer shell segment 15, two outer shell segments 15 a, 15 b of equal length are provided one behind the other. Otherwise, the embodiment from FIG. 10 corresponds to that of FIGS. 1 and 9, so that a further explanation is unnecessary.

In the embodiment of a pipe bend 1 b of FIG. 11, three outer shell segments 15 c, 15 d, 15 e are incorporated between the coupling flanges 6 . Also here speaks the other design of the design of FIGS. 1 and 9, so that a further explanation is not necessary.

In Fig. 12, an embodiment of a pipe bend 1 c is illustrated, in which an outer shell segment 15 f made of cast iron is incorporated into the jacket pipe 2 welded to the end with coupling flanges 6 a only in the center of curvature 14 of the pipe bend 1 c from the area facing away. This outer shell segment 15 f extends between the coupling flanges 6 a, the end faces 28 of the shell segment 15 f and 25 of the casing tube 2 each running at right angles to one another on the standing transverse planes E1-E1. The wall thickness Dl of the shell segment 15 f is greatest in its middle length region and decreases towards the ends. One-piece projections 19 protrude from the outer surface 18 of the shell segment 15 f in the direction of the inner surface 20 of the casing tube 2 .

The coupling flanges 6 a are formed in two layers, where the outer layers 7 a with welded socket 5 a overlap the ends of the casing tube 2 and are welded to the outer upper surface 13 . The outer layers 7 a comprise wear rings 8 a, which have a greater wall thickness in the center of curvature facing away from the circumferential region than in the region 14 facing the center of curvature. The wall thickness is adapted on the one hand to the end wall thickness of the outer shell segment 15 f and on the other hand to the wall thickness of the casing tube 2 .

The outer end faces 9 a, 10 a of the outer layers 7 a and the wear rings 8 a run in the same transverse planes EE.

In the case of the embodiment of a pipe bend 1 d of FIGS. 13 and 14, a 90 ° curved cylindrical jacket pipe 2 made of a weldable steel is welded to the end 29 of the pipe bend 1 d in the transport direction TR of the solid with a double-layer coupling flange 6 . For this purpose, the coupling flange 6 has an outer layer 7 with an annular collar 11 , coupling groove 12 and welding socket 5 , which overlaps the inlet-side end 3 of the casing tube 2 . The outer layer 7 comprises a wear ring 8 made of a more wear-resistant material. The wear ring 8 has seen over the entire order to the same wall thickness. The outer Stirnsei th 9 , 10 of the outer layer 7 and the wear ring 8 duri fen in the same transverse plane EE.

The lying in the transport direction TR outlet 4 of the casing tube 2 is overlapped by a single-layer coupling flange 6 b made of a weldable steel with a collar 11 , coupling groove 12 and welded socket 5 . On welded socket 5 and outer surface 13 of the casing tube 2 are welded.

From the inlet-side coupling flange 6 extends in the area facing away from the center of curvature 14 of the pipe bend 1 d, an outer shell segment 15 g made of cast iron, which holds the single-layer coupling flange 6 b. The leg end faces 16 of the outer shell segment 15 g extend in the central longitudinal plane MEME, which runs in the longitudinal axis 17 of the circular transport cross section TQ and is perpendicular to the center of curvature 14 .

To secure the position, the outer shell segment 15 g at the outlet-side end 32 has at least one protrusion 30 projecting from the outer surface 18 , which reaches the position on the inner end face 31 of the coupling flange 6 b. The wall thickness D1 of the outer shell segment 15 g increases starting from the two-layer coupling flange 6 to the middle and decreases again at the outlet-side end 32 of the pipe bend 1 d up to the end face 33 , which is in the same transverse plane EE as the end face 34 of the coupling flange 6 b runs.

In the center of curvature 14 of the pipe bend 1 d facing a region between the coupling flanges 6 , 6 b clamped inner shell segment 21 a made of a weldable steel semicircular cross-section at a radial distance A1 to the casing pipe 2 is provided. The leg end faces 22 of this inner shell segment 21 a extend in the longitudinal axis 17 of the trans port cross-section TQ, point 14 of curvature perpendicular to the central longitudinal plane ME-ME. Its wall thickness D2 is less than the smallest wall thickness D1 of the outer shell segment 15 g.

The inner shell segment 21 a extends from the double-layered coupling flange 6 to the end 32 of the pipe bend 1 d auslaufsei term and also includes the single-layer coupling flange 6 b so far that its end face 35 extends in the transverse plane EE, in which the end faces 33rd , 34 of the coupling flange 6 b and the outer shell segment 15 g.

It is further seen that the wall thickness D2 of a wall thickness D2 of the wear 8 corresponds to the inner shell segment 21 of the double coupling flange. 6

To secure the position of the inner shell segment 21 a, this has at least one welding point 36 at the outlet-side end 32 of the pipe bend 1 d, which is supported against the inner end face 31 of the coupling flange 6 b. A welding spot 37 at the inlet end 29 of the casing tube 2 can be used to distance the casing tube 2 .

Reference list

1 elbow
1 a elbow
1 b elbow
1 c elbow
1 d elbow
2 jacket tube v. 1
3 end of 2nd
4 end of 2nd
5 welded socket v. 6
5 a welding socket
6 coupling flanges
6 a coupling flanges
6 b coupling flanges
7 outer layers from 6
7 a outer layers of 6 a
8 wear rings
8 a wear rings
9 end faces from 7
9 a end faces
10 end faces from 8th
10 a end faces
11 Rungbunde v. 7
12 coupling grooves
13 outer surface of 2nd
14 center of curvature
15 outer shell segment
15 a outer shell segment
15 b outer shell segment
15 c outer shell segment
15 d outer shell segment
15 e outer shell segment
15 f outer shell segment
15 g outer shell segment
16 front sides of thigh 15
17 longitudinal axis v. 1
18 outer surface v. 15
19 tabs on 15
20 inner surface v. 2nd
21 inner shell segment
21 a inner shell segment
22 thigh front v. 21
23 outer surface of 21
24 tabs on 21
25 end faces from 2nd
26 end faces from 15
27 end faces from 21
28 end faces from 15 f
29 end of 1 d
30 head start at 15 g
31 front of v. 6 b
32 end of 1 d
33 front of v. 15 g
34 front side of 6 b
35 front side of 21 a
36 spot weld
37 spot weld
A distance between 2 u. 15
A1 distance between 2 and 21
D wall thickness v. 2nd
D1 wall thickness of 15
D2 wall thickness of 21
D3 wall thickness of 8th
EE transverse plane
E1-E1 transverse plane
ME-ME median longitudinal plane
TQ transport cross section
TR transport direction

Claims (8)

1. Elbow for interchangeable incorporation into a hydraulic or pneumatic transport of solids serving tubing, which has an inter mediate coupling flanges ( 6 , 6 a, 6 b) a welded jacket tube ( 2 ) made of a weldable steel and one with a radial distance (A ) to the jacket tube ( 2 ) arranged in its interior wear insert ( 15 , 15 a-g) made of a more wear-resistant material than the material of the jacket tube ( 2 ), characterized in that the wear insert ( 15 , 15 ag) from at least one in the center of the curvature ( 14 ) of the tubular casing ( 2 ) is arranged and between the coupling flanges ( 6 , 6 a, 6 b) clamped outer shell segment is formed semicircular cross-section ge, the leg end faces ( 16 ) of which in the in the longitudinal axis ( 17 ) of the circular trans port cross-section (TQ) extending to the center of curvature ( 14 ) perpendicular to the longitudinal center level (ME-ME). 2. Pipe bend according to claim 1, characterized in that in the center of the curvature ( 14 ) of the tubular casing ( 2 ) facing area between the coupling flanges ( 6 , 6 a, 6 b) clamped inner shell segment ( 21 , 21 a) semicircular cross-section At a radial distance (A1) to the casing tube ( 2 ) is provided, the ends of the legs ( 22 ) extending in the longitudinal plane (ME-ME) extending in the longitudinal axis ( 17 ) of the transport cross section (TQ), perpendicular to the center of curvature ( 14 ) and whose wall thickness (D2) is smaller than the wall thickness (D1) of the outer shell segment ( 15 , 15 a-g). 3. Pipe bend according to claim 1 or 2, characterized in that the end faces ( 25 , 28 ) of the tubular casing ( 2 ) and the outer shell segment ( 15 f) each extend in the same transverse planes (E1-E1) and the coupling flanges ( 6 a) have inner wear rings ( 8 a). 4. Pipe bend according to claim 3, characterized in that the wear rings ( 6 a) in the circumferential area facing away from the center of curvature ( 14 ) have a greater wall thickness than in the circumferential area facing the center of curvature ( 14 ). 5. Elbow according to one of claims 1 to 3, characterized in that the end faces ( 25 , 26 , 27 ) of the tubular casing ( 2 ), the outer shell segment ( 15 , 15 a-e) and the inner shell segment ( 21 ) each in the same Extend transverse planes (E1-E1) and have the coupling flanges ( 6 ) in inner wear rings ( 8 ). 6. Pipe bend according to claim 1 or 2, characterized in that at the inlet side in the transport direction (TR) end ( 3 ) the Stirnsei th ( 25 , 26 , 27 ) of the tubular casing ( 2 ), the outer shell segment ( 15 g) and of the inner shell segment ( 21 a) run in the same transverse plane (E1-E1) and meet the wear ring ( 8 ) and the outer layer ( 7 ) of a two-layer coupling flange ( 6 ), while the outer and inner ends ( 4 ) Shell segment ( 15 g, 21 a) grasp a single-layer coupling flange ( 6 b), with circumferential projections ( 30 , 36 ) lie axially against this coupling flange ( 6 b) and their end faces ( 33 , 35 ) as well as the end face ( 34 ) of the single-layer coupling flange ( 6 b) extend in the same transverse plane (EE). 7. Pipe bend according to one of claims 1 to 6, characterized in that the outer shell segment ( 15 , 15 a-g) via peripheral projections ( 19 ) on the inner surface ( 20 ) of the tubular casing ( 2 ) can be supported. 8. Elbow according to one of claims 1 to 6, characterized in that the inner shell segment ( 21 , 21 a) via peripheral projections ( 24 ) on the inner surface ( 20 ) of the tubular casing ( 2 ) can be supported.