Polytetrafluoroethylene lining pipe with corrosion-resistant function

Abstract

The utility model discloses a polytetrafluoroethylene lining pipe with a corrosion-resistant function, which relates to the field of polytetrafluoroethylene lining pipes and comprises a pipe body, a plurality of slots are annularly arranged on the outer wall of the pipe body at intervals along the length direction, and insertion strips are slidably connected in the slots. And at least one end cover is inserted into the end part of the pipe body along the direction parallel to the axis. After the lining pipe is inserted into the steel pipe, the insertion strips matched with the insertion grooves are sequentially inserted into the steel pipe, so that the insertion strips are in close contact with the inner walls of the insertion grooves and the inner wall of the steel pipe, and the situation that the steel pipe cannot be inserted into the polytetrafluoroethylene lining pipe in a matched mode due to the too long steel pipe is avoided.

Description

Technical Field

[0001] The utility model relates to the field of polytetrafluoroethylene lined pipes, and specifically relates to a polytetrafluoroethylene lined pipe with corrosion resistance function. Background Art

[0002] The polytetrafluoroethylene lined pipe is a kind of steel-polytetrafluoroethylene composite pipe, which can resist strong acids and alkalis.

[0003] The manufacturing process of the polytetrafluoroethylene lined steel pipe includes inserting the made polytetrafluoroethylene lined pipe into the steel pipe, and flanging the end of the polytetrafluoroethylene lined pipe after heating.

[0004] In view of the above related technologies, when the existing polytetrafluoroethylene lined pipe is installed into some pipes with longer lengths, due to the large friction force between the inner wall of the pipe and the polytetrafluoroethylene lined pipe, it is easy to increase the installation difficulty. And in order to avoid gaps between the polytetrafluoroethylene lined pipe and the pipe, the polytetrafluoroethylene lined pipe and the pipe often need to be closely matched, which further increases the installation difficulty of the polytetrafluoroethylene lined pipe. To sum up, the existing polytetrafluoroethylene lined pipe is prone to installation difficulties when installed into a longer pipe. Content of the Utility Model

[0005] Based on this, the purpose of the utility model is to provide a polytetrafluoroethylene lined pipe with corrosion resistance function to solve the technical problem that the existing polytetrafluoroethylene lined pipe is prone to installation difficulties when installed into a longer pipe.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A polytetrafluoroethylene lined pipe with corrosion resistance function, including a pipe body. Along the length direction, a plurality of slots are arranged at intervals in a ring shape on the outer wall of the pipe body. An insertion strip is slidably connected in the slot, and at least one end cover is inserted into the end of the pipe body along the direction parallel to the axis.

[0007] By adopting the above technical solution, after the lined pipe is inserted into the steel pipe, the insertion strips matching the slots are inserted in turn, so that the insertion strips are in close contact with the inner wall of the slot and the inner wall of the steel pipe, avoiding the situation that the polytetrafluoroethylene lined pipe cannot be inserted and matched due to the too long length of the steel pipe.

[0008] The utility model is further arranged as follows: One end of the pipe body is fixedly connected with an end cover, and a ring groove is arranged on the ring surface of the other end. The end cover corresponding to the other end of the pipe body is fixedly connected with a matching insertion ring towards the ring groove direction.

[0009] By adopting the above technical solution, the assembly speed of the pipe body and the steel pipe is further improved.

[0010] The present utility model is further configured such that annular grooves are provided on the annular surfaces at both ends of the pipe body, and end caps are inserted at both ends of the pipe body.

[0011] By adopting the above technical solution, the situation where the insert bar cannot be smoothly inserted due to excessive frictional force is effectively avoided.

[0012] The present utility model is further configured such that the cross-section of the annular groove is in a trapezoidal structure, and the cross-section of the insertion ring is in a trapezoidal structure matching the annular groove.

[0013] By adopting the above technical solution, the fluid inside the steel pipe is effectively prevented from leaking from the joint between the end cap and the pipe body.

[0014] The present utility model is further configured such that a graphite layer is coated on the inner wall of the insertion slot.

[0015] By adopting the above technical solution, the graphite layer plays a lubricating role, further improving the smoothness of the insert bar sliding along the length direction after being inserted into the insertion slot.

[0016] The present utility model is further configured such that heat insulation layers, a strengthening layer, and heat insulation layers are sequentially arranged at intervals along the length direction inside the pipe body.

[0017] By adopting the above technical solution, the phenomenon that the pipe body is bent during transportation and installation is avoided.

[0018] The present utility model is further configured such that both the heat insulation layer and the strengthening layer are provided with annular protrusions at intervals along the length direction.

[0019] By adopting the above technical solution, the annular protrusions play a limiting role, and can effectively prevent the heat insulation layer and the strengthening layer from sliding along the length direction inside the pipe body.

[0020] The present utility model is further configured such that the length of the insert bar is the same as that of the insertion slot, and can be completely accommodated inside the insertion slot.

[0021] By adopting the above technical solution, the insert bar fills the gap inside the insertion slot, avoiding excessive deformation of the pipe body itself caused by the reciprocating change of the internal pressure of the pipe body.

[0022] In summary, the present utility model mainly has the following beneficial effects:

[0023] 1. By arranging an insertion slot along the length direction on the outer wall of the polytetrafluoroethylene lining pipe, the present utility model reduces the frictional resistance of the polytetrafluoroethylene lining pipe inserted into the steel pipe. After the lining pipe is inserted into the steel pipe, the insert bar matching the insertion slot is inserted in sequence, so that the insert bar is in close contact with the inner wall of the insertion slot and the inner wall of the steel pipe, avoiding the situation where the steel pipe is too long to be inserted and matched with the polytetrafluoroethylene lining pipe;

[0024] 2. The utility model effectively improves the sealing performance of the inner lining pipe at the connection of adjacent steel pipes while playing a role in limiting the insertion strip by arranging a plug-in matching end structure at the end of the polytetrafluoroethylene inner lining pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a perspective view of the utility model;

[0026] Figure 2 is a perspective view of Embodiment 1 of the utility model;

[0027] Figure 3 of the utility model Figure 2 is an enlarged view of A in;

[0028] Figure 4 is a perspective view of Embodiment 2 of the utility model;

[0029] Figure 5 is a perspective view of the pipe body of the utility model;

[0030] Figure 6 is a cross-sectional view of the utility model;

[0031] Figure 7 of the utility model Figure 6 is an enlarged view of B in.

[0032] In the figure: 1, pipe body; 101, slot; 102, annular groove; 2, insertion strip; 3, end cover; 301, insertion ring; 4, strengthening layer; 5, heat insulation layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as limiting the present utility model.

[0034] The embodiments of the present utility model will be described below according to its overall structure.

[0035] Embodiment 1

[0036] A polytetrafluoroethylene inner lining pipe with corrosion resistance function, such as Figures 1-7As shown in the figure, it includes a tube body 1. The tube body 1 is specifically a polytetrafluoroethylene lined tube. The tube body 1 is used to be inserted into a steel pipe to play a lining role. A plurality of slots 101 are arranged at intervals in a ring shape along the length direction of the outer wall of the tube body 1. An insert bar 2 is slidably connected in the slots 101. At least one end cap 3 is inserted into the end of the tube body 1 along the direction parallel to the axis. The outer edge of the end cap 3 is provided with bolt connection holes distributed at intervals in a ring shape. One end of the tube body 1 is fixedly connected to the end cap 3, and a ring groove 102 is arranged on the ring surface at the other end. The insert ring 301 that cooperates with it is fixedly connected to the end cap 3 corresponding to the other end of the tube body 1 facing the ring groove 102. The insert bar 2 is directly inserted from the end of the tube body 1 where the end cap 3 can be inserted, reducing the subsequent steps of connecting the end cap 3 and further improving the assembly speed of the tube body 1 and the steel pipe. The length of the insert bar 2 is the same as that of the slot 101 and can be completely accommodated inside the slot 101, so that the insert bar 2 fills the gap in the slot 101, avoiding excessive deformation of the tube body 1 itself caused by the reciprocating change of the internal pressure of the tube body 1.

[0037] Please refer to Figures 2-7 , a graphite layer is coated on the inner wall of the slot 101. The graphite layer plays a lubricating role and further improves the smoothness of the insert bar 2 sliding along the length direction after being inserted into the slot 101. Heat insulation layers 5 and a strengthening layer 4 are arranged at intervals in sequence along the length direction inside the tube body 1. The heat insulation layer 5 plays a role in preventing the temperature of the fluid inside the tube body 1 from losing too fast, while the strengthening layer 4 can effectively improve the structural strength of the tube body 1 and avoid the phenomenon of the tube body 1 being bent during transportation and installation.

[0038] Embodiment 2

[0039] A polytetrafluoroethylene lined tube with corrosion resistance function, as Figures 1-7 shown. On the basis of Embodiment 1, the difference from Embodiment 1 is that ring grooves 102 are arranged on the ring surfaces at both ends of the tube body 1, and end caps 3 are inserted at both ends of the tube body 1. When the length of the steel pipe itself is relatively long, after inserting the tube body 1 into the steel pipe, a guide rope can be used to connect the end of the insert bar 2. First, pass the guide rope through the slot 101, and then push the insert bar 2 into the slot while pulling the guide rope at the other end, effectively avoiding the situation where the insert bar 2 cannot be inserted smoothly due to excessive friction. The cross-section of the ring groove 102 is in a trapezoidal structure, and the cross-section of the insert ring 301 is in a trapezoidal structure that matches the ring groove 102, forming a sealing structure between the end cap 3 and the tube body 1 and effectively preventing the fluid inside the steel pipe from leaking from the joint between the end cap 3 and the tube body 1.

[0040] Please refer to Figures 2-7, both the heat insulation layer 5 and the strengthening layer 4 are provided with annular protrusions at intervals along the length direction. Specifically, in the pipe body 1, a matching annular concave part and a convex part are arranged at the parts of the heat insulation layer 5 and the strengthening layer 4 where the annular protrusions are located. The annular protrusions play a role in limiting positions, and can effectively prevent the heat insulation layer 5 and the strengthening layer 4 from sliding along the length direction in the pipe body 1.

[0041] The working principle of the present utility model is as follows: When installing the polytetrafluoroethylene lined pipe, the pipe body 1 is inserted along the axial direction of the steel pipe. Since the contact area between the outer wall of the pipe body 1 and the inner wall of the steel pipe is small, the pipe body 1 will not be subjected to excessive resistance when inserted into the interior of the steel pipe. After the pipe body 1 is inserted into the interior of the steel pipe, the inserts 2 are successively inserted into the slots 101 along the direction parallel to the axis of the pipe body 1. Finally, the end cap 3 is inserted into the end of the pipe body 1 along the axial direction of the pipe body 1, and then the adjacent two steel pipes are connected to conveniently complete the installation work of the polytetrafluoroethylene lined pipe of the longer steel pipe.

[0042] Although the embodiments of the present utility model have been shown and described, the specific embodiments are only explanations of the present utility model, and they are not limitations to the utility model. The specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can, without departing from the principle and purpose of the present utility model, make modifications, substitutions and variations that do not make creative contributions to the embodiments according to needs. However, as long as it is within the scope of the claims of the present utility model, it is protected by the patent law.

Claims

1. A polytetrafluoroethylene-lined pipe with corrosion-resistant function, comprising a pipe body (1), characterized in that: A plurality of slots (101) are annularly and spaced along the length direction on the outer wall of the tube body (1), an inserting strip (2) is slidably connected in the slot (101), and at least one end cover (3) is inserted into the end of the tube body (1) along a direction parallel to the axis.

2. The polytetrafluoroethylene lined pipe with corrosion resistance function according to claim 1, characterized in that: One end of the tube body (1) is fixedly connected with an end cover (3), and an annular groove (102) is arranged on the annular surface at the other end. An inserting ring (301) which is matched with the annular groove (102) is fixedly connected to the end cover (3) corresponding to the other end of the tube body (1) towards the direction of the annular groove (102).

3. The polytetrafluoroethylene lined pipe with corrosion-resistant function according to claim 2, characterized in that: Annular grooves (102) are arranged on the annular surfaces at both ends of the tube body (1), and end covers (3) are inserted at both ends of the tube body (1).

4. The polytetrafluoroethylene lined pipe with corrosion resistance function according to claim 3, characterized in that: The cross section of the annular groove (102) is in a trapezoidal structure, and the cross section of the inserting ring (301) is in a trapezoidal structure matched with the annular groove (102).

5. The polytetrafluoroethylene lined pipe with corrosion-resistant function according to claim 1, characterized in that: A graphite layer is coated on the inner wall of the slot (101).

6. The polytetrafluoroethylene lined pipe with corrosion-resistant function according to claim 1, wherein: Heat insulation layers (5), reinforcing layers (4), and heat insulation layers (5) are sequentially and spaced along the length direction in the tube body (1).

7. The polytetrafluoroethylene lined pipe with corrosion resistance function according to claim 6, characterized in that: Both the heat insulation layer (5) and the reinforcing layer (4) are provided with annular protrusions at intervals along the length direction.

8. The polytetrafluoroethylene lined pipe with corrosion resistance function according to claim 1, characterized in that: The length of the inserting strip (2) is the same as that of the slot (101), and it can be completely accommodated inside the slot (101).

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