Conveying pipeline

Abstract

The conveying pipeline comprises a conveying pipe (10), a clamping and fixing assembly (50) and a sealing gasket (70). The conveying pipe comprises an outer pipe (11) and a lining pipe (13). The outer tube has a flange (112). The conveying pipes are connected through the flange plates. The radial inner edge of the flange plate is recessed in the axial direction to form an annular groove (C1). An annular sealing flange (T1) is arranged on the axial end face of the flange plate in a protruding mode and located on the radial outer side of the annular groove. The liner tube has a tubular portion (131) and a sealing portion (133). The tubular part is attached to the inner surface of the outer tube. The sealing part is attached to the axial end face of the flange plate and located on the radial inner side of the sealing flange. The sealing part is provided with an annular boss (T2) embedded in the annular groove. And the sealing parts of the two connected conveying pipes are mutually extruded along the axial direction. The clamping and fixing assembly can clamp the two flange plates. And the sealing gasket is clamped between the sealing flanges of the two connected flange plates in a sealing manner. The conveying pipeline can achieve good sealing performance.

Description

Technical Field

[0001] The invention relates to the field of pipeline transportation, in particular to a transportation pipeline. Background Art

[0002] With the development of long-distance slurry pipeline transportation technology, the transportation distance of slurry pipeline transportation is getting longer and longer, and the transportation pressure is getting higher and higher. During the slurry transportation process, the solid particles in the slurry will cause wear on the steel pipe. At the same time, the pH value of some slurry transportation carriers is acidic, or contains more chloride ions and sulfate ions, which will accelerate the corrosion of steel pipes. Therefore, more and more slurry pipelines use non-metallic materials (such as rubber, high molecular weight polyvinyl chloride, ultra-high molecular weight polyvinyl chloride, etc.) to line the steel pipe to increase the service life of the pipeline.

[0003] At the connection between steel pipes, non-metallic lining materials are sealed by mutual extrusion, and their sealing performance cannot meet the requirements of higher conveying pressure. Summary of the invention

[0004] The object of the present invention is to provide a conveying pipeline with better sealing performance.

[0005] The present invention provides a conveying pipeline, which comprises a conveying pipe, a clamping and fixing assembly and a sealing gasket. The conveying pipe comprises an outer pipe and an inner liner pipe. The outer pipe has a flange at the end thereof. The conveying pipes are connected to each other through the flange. The radial inner edge of the flange is recessed along the axial direction of the flange to form an annular groove. The axial end surface of the flange is provided with an annular sealing flange protruding radially outward of the annular groove. The inner liner pipe comprises a tubular portion and an annular sealing portion. The tubular portion is attached to the inner surface of the outer pipe. The sealing portion is attached to the axial end surface of the flange and is located radially inward of the sealing flange. The sealing portion has an annular boss embedded in the annular groove. The sealing portions of the two connected conveying pipes are pressed against each other along the axial direction of the flange to form a first annular seal. The clamping and fixing assembly can clamp and fix the two flanges along the axial direction of the flange. The sealing gasket is in the shape of an annular sheet and is sealedly clamped between the sealing flanges of the two connected flanges to form a second annular seal.

[0006] The delivery pipeline can form two annular seals at the connection of the delivery pipe, thereby achieving better sealing performance.

[0007] In another exemplary embodiment of the delivery pipe, the axial bottom surface of the annular groove is a truncated cone side surface, and the large diameter end of the truncated cone side surface is located at the axial bottom end of the annular groove. The axial bottom surface of the annular groove in the form of a truncated cone side surface can apply a radially outward force to the sealing portion through the annular boss. For a delivery pipe manufactured by a tube drawing process, this helps prevent the sealing portion from turning radially inward under the pulling of the tubular portion, which is beneficial to maintaining the stability of the structure.

[0008] In another exemplary embodiment of the conveying pipeline, the angle between the side surface of the frustum and its axis is 75 degrees to 85 degrees.

[0009] In another exemplary embodiment of the conveying pipeline, the axial end face of the flange is also protruded with an annular limiting flange. The limiting flange is located between the annular groove and the sealing flange along the radial direction of the flange. The sealing portion is provided with an annular limiting groove corresponding to the limiting flange. The limiting flange is embedded in the limiting groove. For the conveying pipe manufactured by the tube drawing process, the cooperation between the limiting flange and the limiting groove helps to prevent the sealing portion from turning radially inward under the pulling of the tubular portion, which is beneficial to maintaining the stability of the structure. In addition, the limiting flanges of the two connected conveying pipes relatively squeeze the sealing portion in the axial direction, which is beneficial to further improve the sealing performance.

[0010] In another exemplary embodiment of the conveying pipeline, the sealing flange and the limiting flange are formed by protruding from a base surface of the flange perpendicular to its axis, and the protruding height of the sealing flange is higher than the protruding height of the limiting flange. The annular groove is formed by concavely forming from the base surface, thereby facilitating processing.

[0011] In another exemplary embodiment of the delivery pipeline, the clamping force from the sealing flange on the sealing gasket is greater than the extrusion force between the sealing parts of the two delivery pipes. The second annular seal formed between the sealing gasket and the sealing flange plays a major sealing role, and the first annular seal formed between the sealing parts of the two delivery pipes plays an auxiliary sealing role. The main purpose of the first annular seal is to prevent the liquid in the delivery pipeline from contacting and corroding the sealing flange. This is conducive to improving the sealing performance.

[0012] In another exemplary embodiment of the conveying pipeline, the clamping and fixing assembly includes a plurality of bolt connection pairs. The bolts of each bolt connection pair are inserted into two connected flanges. The plurality of bolt connection pairs are distributed radially outside the sealing gasket along the circumference of the flange. The outer edge of the sealing gasket is tangent to the bolts of the plurality of bolt connection pairs. This facilitates the positioning of the sealing gasket during assembly.

[0013] In another exemplary embodiment of the delivery pipeline, the radially outer portions of the two connected flanges on the sealing flange are spaced apart in the axial direction of the flanges to form a gap, thereby facilitating the improvement of the sealing performance between the sealing gasket and the sealing flange.

[0014] In another exemplary embodiment of the conveying pipeline, the sealing gasket is a non-metallic flat gasket, a polytetrafluoroethylene coated gasket, a metal spiral wound gasket, a metal coated gasket, or a toothed composite gasket with a covering layer.

[0015] In another exemplary embodiment of the transport pipeline, the outer pipe is made of carbon steel, stainless steel or alloy steel.

[0016] In another exemplary embodiment of the transport pipeline, the material of the liner pipe is rubber, high molecular weight polyethylene, ultra-high molecular weight polyethylene or polyurethane.

[0017] In another exemplary embodiment of the conveying pipeline, the sealing gasket is made of metal, non-metal, or a combination of metal and non-metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are only used to schematically illustrate and explain the present invention, and do not limit the scope of the present invention.

[0019] Figure 1 The figure is a cross-sectional structural diagram of a schematic implementation of a conveying pipeline.

[0020] Figure 2 for Figure 1 Enlarged view of part II.

[0021] Figure 3 for Figure 1 Exploded view of the delivery tube shown.

[0022] Figure 4 For along Figure 1 Cross-sectional view of IV-IV.

[0023] Description of symbols 10 Delivery pipe 11 External tube 112 Flange C1 Annular groove 1121 Axial bottom 1122 Side T1 sealing flange T3 stop flange F Basic surface 13 Lined pipe 131 Tubular part 133 Sealing part T2 Annular boss C2 limit slot 50 Clamping and fixing components 51 Bolt connection pair 511 Bolt 70 Sealing gasket X Clearance L Axis of flange A Axial direction of flange R is the radial direction of the flange. DETAILED DESCRIPTION

[0024] In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific embodiments of the present invention are now described with reference to the accompanying drawings. The same reference numerals in the drawings represent components with the same structure or similar structures but the same functions.

[0025] In this document, “exemplary” means “serving as an example, instance or illustration”, and any diagram or implementation described in this document as “exemplary” should not be interpreted as a more preferred or more advantageous technical solution.

[0026] In order to simplify the drawings, each figure only schematically shows the parts related to the present invention, which do not represent the actual structure of the product.

[0027] Figure 1 FIG. 1 is a schematic cross-sectional view of a schematic embodiment of a conveying pipeline, wherein an axial cross section of the main structure of the conveying pipeline is shown. Figure 1 As shown, the delivery pipeline includes a delivery pipe 10, a clamping and fixing assembly 50 and a sealing gasket 70. Every two fixedly connected delivery pipes 10 are fixedly connected to each other through a clamping and fixing assembly 50. A sealing gasket 70 is arranged between every two fixedly connected delivery pipes 10. In this exemplary embodiment, a delivery pipeline consisting of two delivery pipes 10, a clamping and fixing assembly 50 and a sealing gasket 70 is taken as an example for specific description. In other exemplary embodiments, the number of delivery pipes 10, clamping and fixing assemblies 50 and sealing gaskets 70 of the delivery pipeline can be adjusted as needed.

[0028] like Figure 1 As shown, each delivery pipe 10 includes an outer pipe 11 and an inner liner pipe 13. The material of the outer pipe 11 is, for example, carbon steel, stainless steel or alloy steel, and the material of the inner liner pipe 13 is, for example, non-metallic materials such as rubber, high molecular polyethylene, ultra-high molecular polyethylene or polyurethane, but is not limited thereto. The end of the outer pipe 11 has a flange 112. The two delivery pipes 10 are connected to each other through the flange 112 of their outer pipes 11. In this illustrative embodiment, in order to clarify the description, the axis L, axial direction A, and radial direction R of the flange 112 are used to assist in the explanation. In the following text, "axial direction" not explicitly stated refers to the axial direction of the flange 112, "radial direction" not explicitly stated refers to the radial direction of the flange 112, and "circumferential direction" not explicitly stated refers to the circumferential direction of the flange 112.

[0029] Figure 2 for Figure 1 Enlarged view of part II. Figure 3 for Figure 1 Exploded view of the delivery pipe shown. Figure 3As shown, the radial inner edge of the flange 112 is recessed along the axial direction A of the flange 112 to form an annular groove C1. The annular groove C1 is annular and extends along the circumferential direction of the flange 112. An annular sealing flange T1 is protruded from the axial end surface of the flange 112 on the radial outer side of the annular groove C1. The sealing flange T1 is annular and extends along the circumferential direction of the flange 112.

[0030] like Figure 2 and Figure 3 As shown, the inner liner pipe 13 has a tubular portion 131 and an annular sealing portion 133. The tubular portion 131 is in the shape of a circular tube and is attached to the inner surface of the outer tube 11. The sealing portion 133 connects the end of the tubular portion 131 and is in the shape of an annulus extending along the circumference of the flange 112. The sealing portion 133 is attached to the axial end surface of the flange 112 and is located radially inside the sealing flange T1. The attachment of the sealing portion 133 to the axial end surface of the flange 112 is, for example, seamless, that is, there is no gap between the two. The sealing portion 133 has an annular boss T2 embedded in the annular groove C1. The sealing portions 133 of the two connected conveying pipes 10 are pressed against each other along the axial direction A of the flange 112 to form a first annular seal.

[0031] The clamping and fixing assembly 50 can clamp and fix the two flanges 112 along the axial direction A of the flanges 112. Specifically, in this exemplary embodiment, Figure 1 As shown, each clamping and fixing assembly 50 includes 8 bolt connection pairs 51 ( Figure 1 Only two of them can be seen in the figure). Each bolt connection pair 51 is composed of, for example, a bolt, a nut and a washer. The bolts 511 of each bolt connection pair 51 are inserted into the two connected flanges 112. The eight bolt connection pairs 51 are evenly distributed along the circumference of the flange 112. This structure has good stability. In other exemplary embodiments, the number of bolt connection pairs 51 of each clamping and fixing assembly 50 can be adjusted as needed.

[0032] like Figure 1 and Figure 2 As shown, the sealing gasket 70 is in the shape of an annular sheet extending along the circumference of the flange 112 and is sealed between the sealing flanges T1 of the two connected flanges 112 to form a second annular seal. The sealing gasket 70 is, for example, a non-metallic flat gasket, a polytetrafluoroethylene coated gasket, a metal spiral wound gasket, a metal coated gasket, or a toothed combined gasket with a covering layer, but is not limited thereto. The material of the sealing gasket 70 is, for example, metal, non-metal, or a combination of metal and non-metal.

[0033] The delivery pipeline can form two annular seals at the connection of the delivery pipe, thereby achieving better sealing performance.

[0034] The axially thickened structure of the annular boss T2 helps prevent the sealing parts 133 of the two connected conveying pipes 10 from excessively deforming when they are squeezed against each other, thereby forming a bulge on the inner wall of the conveying pipe. Such a bulge will accelerate the wear of the inner liner and cause leakage.

[0035] In addition, the outer tube 11 and the inner liner 13 of the conveying pipe 10 are combined together, for example, by a tube drawing process. During the tube drawing process, a sealing portion 133 is first connected to one end of the tubular portion 131, and then the tubular portion 131 is stretched to elastically deform to reduce the diameter, and then the other end of the tubular portion 131 is pulled through the outer tube 11, and another sealing portion 133 is connected after passing through (the traction force is maintained during the process to prevent the tubular portion 131 from shrinking in the axial direction). Finally, the traction force is removed, and the tubular portion 131 shrinks in the axial direction under the action of its own elastic restoring force, and at the same time, the sealing portion 133 will snap to the axial end face of the flange 112 at a very fast speed under the pulling of the tubular portion 131, and finally achieves the fit with the axial end face of the flange 112. During the snapping process, the corner of the inner liner 13 (i.e., the radial inner edge of the sealing portion 133) will be subjected to a large force. In this exemplary embodiment, the provision of the annular groove C1 and the annular boss T2 improves the strength of the inner liner tube 13 at the corner, which helps prevent structural damage during the above-mentioned snapping process.

[0036] like Figure 3 As shown, in the exemplary embodiment, the annular groove C1 is surrounded by a side surface 1122 and an axial bottom surface 1121. The side surface 1122 of the annular groove C1 is, for example, an inner cylindrical surface. The axial bottom surface 1121 of the annular groove C1 is a truncated cone side surface, and the large diameter end of the truncated cone side surface is located at the axial bottom end of the annular groove C1 (i.e. Figure 3 The axial bottom surface 1121 of the annular groove C1, which is a truncated cone side surface, can apply a radially outward force to the sealing portion 133 through the annular boss T2. For a delivery pipe manufactured by a tube drawing process, this helps prevent the sealing portion 133 from turning radially inward under the pulling of the tubular portion 131, thereby maintaining the stability of the structure.

[0037] In the exemplary embodiment, the angle between the truncated cone side surface as the axial bottom surface 1121 of the annular groove C1 and its axis is 75 to 85 degrees, which is conducive to improving stability. This angle should not be too small, otherwise it will cause stress concentration in the sealing part 133.

[0038] like Figure 2 and Figure 3As shown, in the schematic embodiment, the axial end face of the flange 112 is also protruded with an annular limiting flange T3. The limiting flange T3 is annular and extends along the circumference of the flange 112. The limiting flange T3 is located between the annular groove C1 and the sealing flange T1 along the radial direction R of the flange 112. The sealing portion 133 is provided with an annular limiting groove C2 corresponding to the limiting flange T3. The limiting groove C2 is annular and extends along the circumference of the flange 112. The limiting flange T3 is embedded in the limiting groove C2. For the conveying pipe manufactured by the pipe drawing process, the cooperation between the limiting flange T3 and the limiting groove C2 helps to prevent the sealing portion 133 from turning radially inward under the pulling of the tubular portion 131, which is beneficial to maintaining the stability of the structure. In addition, the limiting flanges T3 of the two connected conveying pipes 10 relatively squeeze the sealing portion 133 along the axial direction A, which is beneficial to further improve the sealing performance.

[0039] like Figure 3 As shown, in the exemplary embodiment, the sealing flange T1 and the limiting flange T3 are formed by protruding from a base surface F of the flange 112 perpendicular to its axis, and the protruding height of the sealing flange T1 is higher than the protruding height of the limiting flange T3. The annular groove C1 is formed by being concave from the base surface F. This facilitates processing. In the exemplary embodiment, the height of the sealing flange T1 from the base surface F is, for example, 5mm-9mm; the height of the limiting flange T3 from the base surface F is, for example, 3mm-7mm; the depth of the annular groove C1 from the base surface F is, for example, 20mm-28mm.

[0040] In the exemplary embodiment, the clamping force from the sealing flange T1 borne by the sealing gasket 70 is greater than the extrusion force between the sealing parts 133 of the two conveying pipes 10. That is, the second annular seal formed between the sealing gasket 70 and the sealing flange T1 plays a major sealing role, and the first annular seal formed between the sealing parts 133 of the two conveying pipes 10 plays an auxiliary sealing role. The main purpose of the first annular seal is to prevent the liquid in the conveying pipe from contacting and corroding the sealing flange T1. This is conducive to improving the sealing performance.

[0041] Figure 4 For along Figure 1 The cross-sectional view of IV-IV in the figure. Figure 4 As shown, in the exemplary embodiment, eight bolt connection pairs 51 (only the bolts 511 of the eight bolt connection pairs are visible in the figure) are distributed radially outside the sealing gasket 70. The outer edge of the sealing gasket 70 is tangent to the bolts 511 of the eight bolt connection pairs 51. This facilitates the positioning of the sealing gasket 70 during assembly.

[0042] like Figure 1 and Figure 2As shown, in the exemplary embodiment, the radially outer portions of the two connected flanges 112 on the sealing flange T1 are spaced apart to form a gap X along the axial direction A of the flanges 112. In this way, the clamping force of the clamping and fixing assembly 50 on the two flanges 112 can produce a lever effect at the sealing flange T1, which is beneficial to improving the sealing performance between the sealing gasket 70 and the sealing flange T1.

[0043] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0044] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation scheme or changes that do not deviate from the technical spirit of the present invention, such as combination, division or repetition of features, should be included in the scope of protection of the present invention.

Claims

1. A conveying pipeline, characterized in that: include: The delivery pipe (10) comprises: An outer tube (11) having a flange (112) at its end, the delivery tubes (10) being connected to each other via the flange (112), the radial inner edge of the flange (112) being recessed along the axial direction (A) of the flange (112) to form an annular groove (C1), and an axial end surface of the flange (112) being provided with an annular sealing flange (T1) protruding radially outward of the annular groove (C1), and An inner liner pipe (13) comprising a tubular portion (131) and an annular sealing portion (133), wherein the tubular portion (131) is attached to the inner surface of the outer pipe (11), the sealing portion (133) is attached to the axial end surface of the flange (112) and is located radially inward of the sealing flange (T1), the sealing portion (133) having an annular boss (T2) embedded in the annular groove (C1), and the sealing portions (133) of the two connected conveying pipes (10) are pressed against each other along the axial direction (A) of the flange (112) to form a first annular seal; A clamping and fixing assembly (50) capable of clamping and fixing the two flanges (112) along the axial direction (A) of the flanges (112); and The sealing gasket (70) is in the shape of an annular sheet and is sealingly clamped between the sealing flanges (T1) of the two connected flanges (112) to form a second annular seal.

2. The delivery pipeline according to claim 1, characterized in that: The axial bottom surface (1121) of the annular groove (C1) is a truncated cone side surface, and the large diameter end of the truncated cone side surface is located at the axial bottom end of the annular groove (C1).

3. The delivery pipeline according to claim 2, characterized in that: The angle between the side surface of the truncated cone and its axis is 75 degrees to 85 degrees.

4. The delivery pipeline according to claim 1, characterized in that: The axial end surface of the flange (112) is also provided with an annular limiting flange (T3) protruding therefrom. The limiting flange (T3) is located between the annular groove (C1) and the sealing flange (T1) along the radial direction (R) of the flange (112). The sealing portion (133) is provided with an annular limiting groove (C2) corresponding to the limiting flange (T3), and the limiting flange (T3) is embedded in the limiting groove (C2).

5. The delivery pipeline according to claim 4, characterized in that: The sealing flange (T1) and the limiting flange (T3) are formed by protruding from a base surface (F) of the flange (112) perpendicular to the axis thereof, and the protruding height of the sealing flange (T1) is higher than the protruding height of the limiting flange (T3), and the annular groove (C1) is formed by being concave from the base surface (F).

6. The delivery pipeline according to claim 1, characterized in that: The clamping force from the sealing flange (T1) that the sealing gasket (70) bears is greater than the squeezing force between the sealing portions (133) of the two conveying pipes (10).

7. The delivery pipeline according to claim 1, characterized in that: The clamping and fixing assembly (50) comprises a plurality of bolt connection pairs (51), wherein the bolts (511) of each of the bolt connection pairs (51) are inserted through the two connected flanges (112), and the plurality of bolt connection pairs (51) are distributed radially outwardly of the sealing gasket (70) along the circumference of the flange (112), and the outer edge of the sealing gasket (70) is tangent to the bolts (511) of the plurality of bolt connection pairs (51).

8. The delivery pipeline according to claim 1, characterized in that: Portions of the two connected flanges (112) on the radially outer side of the sealing flange (T1) are spaced apart to form a gap (X) along the axial direction (A) of the flanges (112).

9. The delivery pipeline according to claim 1, characterized in that: The sealing gasket (70) is a non-metallic flat gasket, a polytetrafluoroethylene coated gasket, a metal spiral wound gasket, a metal coated gasket, or a toothed combined gasket with a covering layer.

10. The delivery pipeline according to claim 1, characterized in that: The outer tube (11) is made of carbon steel, stainless steel or alloy steel; The material of the inner lining tube (13) is rubber, high molecular weight polyethylene, ultra-high molecular weight polyethylene or polyurethane; and / or The sealing gasket (70) is made of metal, non-metal, or a combination of metal and non-metal.

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