Bimetal composite pipeline for fluid transportation

Abstract

The utility model discloses a bimetal composite pipeline for fluid transportation, which comprises a bimetal composite pipe and a connecting part, the end parts of a carbon steel base pipe and a lining stainless steel pipe of the bimetal composite pipe are welded together, a locking groove is arranged on the peripheral surface of the carbon steel pipe, and the locking groove is provided with an inclined extrusion surface; a locking ring of the connecting part comprises two locking semi-rings which are connected together through a bolt, an inclined pushing surface is arranged on a flange of each locking semi-ring, and the flanges are inserted into the locking grooves; the sealing ring is installed in a V-shaped end face gap between the two bimetal composite pipes, the locking bolt, the pushing face and the extruding face are matched, the sealing ring can be extruded, and sealing is formed. When the two locking semi-rings are locked through the bolt, the pushing face applies axial pushing force to the extruding face, the two bimetal composite pipes are made to be close to each other, the sealing ring is extruded to deform, sealing is formed, the bimetal composite pipes do not need to be pushed in the axial direction through external equipment any more, the installation steps are simplified, and the installation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of bimetallic composite pipelines for fluid transport. BACKGROUND

[0002] Fluid transport pipeline is usually connected by multiple steel pipes, adjacent steel pipes are connected by connector, to reduce the corrosion of fluid to pipeline, and to reduce the manufacturing cost of steel pipe, composite steel pipe is started to be used as fluid transport pipeline, composite steel pipe is composed of carbon steel base pipe and stainless steel pipe lined in carbon steel base pipe, for example, in the application number 202023263368.7, a kind of composite pipe transport pipeline is disclosed, which includes composite pipeline and connector, composite pipeline includes carbon steel pipe and stainless steel pipe, carbon steel pipe is sleeved on the outside of stainless steel pipe, the end of carbon steel pipe and stainless steel pipe is welded together, the outer periphery of the end of carbon steel pipe is provided with positioning groove;Connector includes two connecting shells and sealing sleeve, the whole connecting shell is semicircular structure, the inner surface of connecting shell is formed with semicircular mounting groove, the two sides of mounting groove are provided with protruding rib, the inner wall of sealing sleeve is provided with annular gasket;For two adjacent composite pipelines, sealing sleeve is wrapped outside the connecting part formed between two composite pipelines, annular gasket covers the welding part formed between carbon steel pipe and stainless steel pipe.The annular gasket in the application is clamped between two adjacent composite pipelines, and covers the welding part formed between carbon steel pipe and stainless steel pipe.The composite pipeline in the application needs to be pushed by external machinery along the axial direction when installing two adjacent composite pipelines, so that the annular gasket can be deformed to seal the gap between two adjacent composite pipelines, and then connecting shell and sealing sleeve are installed, resulting in complicated installation process. SUMMARY

[0003] To solve the problem that the existing composite pipeline needs to be pushed by external machinery along the axial direction when installing two adjacent composite pipelines, so that the annular gasket can be deformed to seal the gap between two adjacent composite pipelines, resulting in complicated installation process, the application provides a kind of bimetallic composite pipelines for fluid transport, which includes a plurality of bimetallic composite pipes and connecting part for connecting two adjacent bimetallic composite pipes, the bimetallic composite pipe includes carbon steel base pipe and stainless steel pipe lined inside carbon steel base pipe, the end of carbon steel base pipe and stainless steel pipe is welded together, the end surface gap between two adjacent bimetallic composite pipes is V-shaped, the large end of the end surface gap faces the radial outer side, locking groove is provided on the outer peripheral surface of the end of carbon steel pipe, the locking groove extends around the outer peripheral surface of carbon steel pipe;Two adjacent locking grooves of two adjacent bimetallic composite pipes form a groove group, in each groove group, the side surface of each locking groove adjacent to another locking groove forms extrusion surface, the extrusion surface is inclined to another locking groove direction from inside to outside along radial direction;

[0004] The connecting part comprises a locking ring, the locking ring comprises two semicircular locking half-rings, the two locking half-rings of the same locking ring are bolted together, and two semicircular flanges protruding radially inward are formed on the inner surfaces of the locking half-rings; the flanges of the same locking ring are one-to-one corresponding, and each flange of the two one-to-one corresponding flanges is formed as a pushing surface, which is inclined from outside to inside in the radial direction and away from the other flange; the flanges on the two locking half-rings of the same locking ring are one-to-one corresponding, and each two one-to-one corresponding flanges jointly form a locking flange, each locking flange corresponds to a locking groove, and the locking flange is inserted into the corresponding locking groove; a sealing ring in the form of a V-shaped ring body is installed in the end face gap, when the two locking half-rings of the same locking ring are clamped on the adjacent two double-metal composite pipes, the pushing surface is pressed against the extrusion surface, the locking bolt can push the adjacent two double-metal composite pipes close to each other, extrude the sealing ring to seal the end face gap, and the sealing ring covers the welding position between the carbon steel pipe and the stainless steel pipe.

[0005] In the application, when the two locking half-rings are locked by using the bolt, the pushing surface can exert an axial pushing force on the extrusion surface, the adjacent two double-metal composite pipes are pushed close to each other, and the sealing ring is extruded, so that the sealing ring is deformed to seal the end face gap, without the need to use external equipment to push the double-metal composite pipes in the axial direction, thereby simplifying the installation steps of the pipeline and improving the installation efficiency of the pipeline.

[0006] In the application, the end face gap between the two double-metal composite pipes and the sealing ring are designed in the form of a V-shaped ring body, when the sealing ring is deformed under pressure, the deformation of the sealing ring mainly extends outward, avoiding the deformation of the sealing ring extending into the pipeline cavity and hindering the fluid in the pipeline.

[0007] Further, in order to generate a larger axial pushing force between the extrusion surface and the pushing surface, the included angle between the extrusion surface and the radial direction is 25-40°, and the extrusion surface is parallel to the pushing surface.

[0008] Further, a limiting ring is sleeved on the sealing ring, a locking cavity is formed between the locking ring and the double-metal composite pipe, and the sealing ring is located in the locking cavity. The limiting ring is used to limit the outward expansion amount of the sealing ring when the sealing ring is deformed under pressure, so that the sealing ring has a relatively balanced deformation in the entire end face gap.

[0009] Further, in order to improve the corrosion resistance of the end face of the double-metal composite pipe, the end face of the carbon steel pipe has a cladding layer, the end face of the stainless steel pipe extends outward beyond the end face of the carbon steel pipe, the cladding layer extends outward to the outer peripheral surface of the carbon steel pipe, and the cladding layer is connected inward to the stainless steel pipe. Specifically, the thickness of the cladding layer is 1.2-2.5 mm.

[0010] Further, the radially inner end of the stainless steel tube extends axially outwardly and forms a step portion, and the step portions of the two adjacent bimetallic composite tubes abut against each other. Specifically, the length of the step portion is 2-5 mm in the axial direction. In the radial direction, the thickness of the step portion is 20-50% of the thickness of the stainless steel tube. The step portion is used to close the inner side of the end face gap, so as to avoid the sealing ring extending into the pipeline after being compressed and deformed, and improve the smoothness of the inner wall of the pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a structural schematic diagram of an embodiment of the present application.

[0012] Figure 2 is Figure 1 is an enlarged view of part A in

[0013] Figure 3 is Figure 2 is an exploded view of

[0014] Figure 4 is Figure 3 is an enlarged view of part B in

[0015] Figure 5 is Figure 1 is a view in the direction of C-C in DETAILED DESCRIPTION

[0016] Referring to Figures 1-5 A bimetallic composite pipeline for fluid transportation includes a plurality of bimetallic composite tubes 10 and a connecting portion for connecting two adjacent bimetallic composite tubes, the bimetallic composite tube 10 includes a carbon steel base tube 11 and a stainless steel tube 12 lined inside the carbon steel base tube 11, and the end of the carbon steel base tube 11 and the end of the stainless steel tube 12 are welded together. The end face of the carbon steel tube has a cladding layer 113, the end face of the stainless steel tube extends outwardly beyond the end face of the carbon steel tube, the cladding layer extends outwardly to the outer peripheral surface of the carbon steel tube, and the cladding layer is connected inwardly to the stainless steel tube. In the present embodiment, the material of the cladding layer is Inconel 600, and the thickness of the cladding layer is 2.1 mm. It can be understood that in other embodiments, the thickness of the cladding layer can also be 1.2 mm, 1.6 mm, 2.3 mm or 2.5 mm, or other data between 1.2-2.5 mm.

[0017] The end faces of two adjacent bimetal composite pipes have a V-shaped end face gap 13, the large end of the end face gap faces the radial outer side, a locking groove 111 is arranged on the outer circumferential surface of the end of the carbon steel pipe 11, and the locking groove 111 extends around the outer circumferential surface of the carbon steel pipe 11. The adjacent locking grooves 111 of two adjacent bimetal composite pipes form a groove group, and in each groove group, the side surface of each locking groove 111 adjacent to the other locking groove 111 forms a pressing surface 112, which is inclined from the inside to the outside in the radial direction and faces the other locking groove.

[0018] The connecting part comprises a locking ring 31, the locking ring 31 comprises two semicircular locking half-rings 311, bolt holes 312 are arranged on each locking half-ring 311, and the two locking half-rings of the same locking ring are connected by bolts to form a locking ring.

[0019] The cross section of the locking half-ring is C-shaped, and two semicircular flanges 313 protruding in the radial direction are formed on the inner surface of the locking half-ring, and in the embodiment, the flanges are located on both sides in the axial direction of the locking half-ring. In the two flanges of the same locking half-ring, the side surface of each flange facing the other flange forms a pushing surface 314, which is inclined from the outside to the inside in the radial direction and faces away from the other flange.

[0020] The flanges 313 on the two locking half-rings 311 of the same locking ring 31 correspond to each other, and each two corresponding flanges 313 form a locking ridge together, and each locking ridge corresponds to a locking groove 111 and is inserted into the corresponding locking groove 111. A sealing ring 21 in the form of a ring body V is installed in the end face gap 13, when the two locking half-rings of the same locking ring are clamped on the adjacent two bimetal composite pipes, the pushing surface 314 is pressed on the pressing surface 112, the locking bolt can push the two adjacent bimetal composite pipes close to each other, and the sealing ring is extruded to seal the end face gap, and the sealing ring covers the welding position between the carbon steel pipe and the stainless steel pipe. In the embodiment, the pressing surface and the pushing surface are parallel, and the included angle α between the pressing surface 112 and the radial direction is 32°, and it can be understood that in other embodiments, the included angle α is 25°, 30°, 35° or 40°, and of course it can also be other angles between 25-40°.

[0021] In the embodiment, in order to ensure the sealing performance of the end face gap 13, a limiting ring 22 is sleeved on the sealing ring. A locking cavity 32 is formed between the locking ring and the bimetal composite pipe, and the limiting ring 22 is located in the locking cavity 32. The limiting ring limits the outward extension of the sealing ring when it is extruded.

[0022] In this embodiment, the radially inner end of the stainless steel tube extends axially outward and forms a step portion 121, and the axial end surface 122 of the step portion extends radially. The step portions of the two adjacent bimetal composite tubes are pressed against each other. In the axial direction, the length of the step portion is 3 mm. In the radial direction, the thickness of the step portion is 30% of the thickness of the stainless steel tube. The step portion is used to limit the deformation amount of the sealing ring 21. When the step portions of the two adjacent bimetal composite tubes are pressed against each other, the deformation amount of the sealing ring reaches the set deformation amount, avoiding excessive compression or insufficient compression of the sealing ring.

Claims

1. A bimetallic composite pipe line for fluid transport, characterized by The connecting part comprises a locking ring, the locking ring comprises two semicircular locking half-rings, the two locking half-rings of the same locking ring are integrally connected through bolts, and two semicircular flanges protruding in the radial direction are formed on the inner surfaces of the locking half-rings; in the two flanges of the same locking half-ring, the side surface of each flange facing the other flange is formed into a pushing surface, and the pushing surface is inclined in the radial direction from the outside to the inside and away from the other flange; the flanges on the two locking half-rings of the same locking ring correspond to each other, and each two corresponding flanges jointly form a locking convex edge, each locking convex edge corresponds to a locking concave groove, and the locking convex edge is inserted into the corresponding locking concave groove; a sealing ring in the form of a ring body with a V shape is arranged in the end face gap, when the two locking half-rings of the same locking ring are clamped on the adjacent two double-metal composite pipes, the pushing surface is pressed against the extrusion surface, the locking bolt can push the two adjacent double-metal composite pipes close to each other, extrude the sealing ring, seal the end face gap, and the sealing ring covers the welded part between the carbon steel pipe and the stainless steel pipe. The angle between the extrusion surface and the radial direction is 25-40°, and the extrusion surface is parallel to the pushing surface.

2. The bimetallic composite pipe for fluid transport according to claim 1, wherein A limiting ring is sleeved on the sealing ring, a locking cavity is formed between the locking ring and the double-metal composite pipe, and the sealing ring is located in the locking cavity.

3. The bimetallic composite pipe for fluid transport according to claim 1, wherein The end surface of the stainless steel pipe outwardly exceeds the end surface of the carbon steel pipe, the surfacing layer extends outwardly to the outer circumferential surface of the carbon steel pipe, and the surfacing layer is connected to the stainless steel pipe inwardly.

4. The bimetallic composite pipe for fluid transport according to claim 1, wherein The thickness of the surfacing layer is 1.2-2.5 mm.

5. The bimetallic composite pipe for fluid transport according to claim 4, wherein The radially inner end of the stainless steel pipe extends outwardly in the axial direction and forms a step part, and the step parts of the two adjacent double-metal composite pipes are pressed against each other.

6. The bimetallic composite pipe for fluid transport according to claim 4, wherein In the axial direction, the length of the step part is 2-5 mm.

7. The bimetallic composite pipe for fluid transport according to claim 6, wherein In the radial direction, the thickness of the step part is 20-50% of the thickness of the stainless steel pipe.

8. The bimetallic composite pipe for fluid transport according to claim 6, wherein ​

Images