Corrosion and high temperature resistant steel lined PFA reducing pipe

Abstract

The utility model discloses a kind of corrosion-resistant, high-temperature-resistant steel lining PFA reducing pipe, including reducing steel pipe, combined steel skeleton and corrosion-proof lining.The corrosion-resistant, high-temperature-resistant steel lining PFA reducing pipe in corrosion-proof lining adopts PFA plastic, PFA plastic can be meltable polytetrafluoroethylene, its material property gives corrosion-proof lining excellent corrosion resistance and high temperature resistance, corrosion-proof lining covers the inner wall of reducing steel pipe and wraps split cone pipe and enhanced straight pipe, meet the demand of reducing pipe corrosion resistance high-temperature resistance;Combined steel skeleton is located in the side wall of corrosion-proof lining, provides support for corrosion-proof lining, compared with the existing steel pipe and lining combined pipeline, this reducing pipe has higher structural strength, is less affected by high pressure generated in working process, can withstand greater pressure without breakage.

Description

Technical Field

[0001] This utility model relates to a reducer, and more particularly to a corrosion-resistant and high-temperature resistant steel-lined PFA reducer. Background Technology

[0002] Reducers are used to connect two pipes of different diameters and are widely used in industries such as petrochemicals, pharmaceuticals, chemicals, and food processing to transport water, oil, natural gas, and other liquids or gases. Some of these gases or liquids are highly corrosive; therefore, reducers usually require a liner, such as the fluoropolymer-lined reducer in existing technology, which has good corrosion resistance and high-temperature resistance. However, the liner is usually bonded or hot-pressed onto the inner wall of the reducer and is easily damaged by the high pressure generated during operation, causing liquid to enter the gap between the liner and the reducer and corrode the reducer. Utility Model Content

[0003] Purpose of the utility model: To provide a corrosion-resistant and high-temperature resistant steel-lined PFA reducer with high structural strength of the corrosion-resistant inner lining, which is not easily damaged by the high pressure generated during operation.

[0004] Technical solution: The corrosion-resistant and high-temperature resistant steel-lined PFA reducer provided by this utility model includes a reducer, a composite steel frame, and an anti-corrosion liner; the composite steel frame includes a spliced ​​tapered tube and a reinforcing straight tube; the spliced ​​tapered tube and the reinforcing straight tube are coaxially installed inside the reducer, and the inner end of the spliced ​​tapered tube is connected to the inner end of the reinforcing straight tube; the anti-corrosion liner covers the inner wall of the reducer and has a uniform thickness; the anti-corrosion liner wraps around the spliced ​​tapered tube and the reinforcing straight tube.

[0005] Furthermore, the assembled tapered tube includes multiple sector-shaped segments; a snap-fit ​​protrusion is provided on one straight edge of each sector-shaped segment, and a snap-fit ​​groove is provided on the other straight edge; the snap-fit ​​protrusions of each sector-shaped segment snap into the snap-fit ​​grooves of adjacent sector-shaped segments to form a conical assembled tapered tube; multiple main fixing strips are fixed at intervals and at an angle on the inner wall of the tapered section of the reducing steel pipe, with adjacent main fixing strips having opposite inclination directions; a main positioning strip is fixed at an angle on the outer wall of each sector-shaped segment; the edges of each main positioning strip snap into the inner wall of the tapered section of the reducing steel pipe.

[0006] Furthermore, several limiting holes are provided on the reinforced straight pipe and each sector plate, and the anti-corrosion lining penetrates and fills each limiting hole.

[0007] Furthermore, multiple arc-shaped grooves are provided on the inner end edge of the reinforced straight tube; and arc-shaped protrusions are respectively inserted into each arc-shaped groove on the inner end of the assembled tapered tube.

[0008] Furthermore, multiple pairs of fixing strips are obliquely fixed on the inner wall of the straight section of the reducing steel pipe; the two fixing strips in the same pair are obliquely inclined in opposite directions; multiple positioning strips are fixed at intervals on the outer wall of the reinforcing straight pipe; the edge of each positioning strip is respectively snapped between each fixing strip and the inner wall of the straight section of the reducing steel pipe.

[0009] Furthermore, limiting rings are installed on the inner walls of both ends of the reducing steel pipe; the two limiting rings are pressed tightly against the outer ends of the spliced ​​tapered pipe and the reinforced straight pipe respectively; the two limiting rings are wrapped with an anti-corrosion lining.

[0010] Furthermore, mounting flanges are fixed on both ends of the reducing steel pipe; sealing flanges are integrally installed at both ends of the anti-corrosion lining, pressing tightly against the corresponding mounting flanges.

[0011] Compared with the prior art, the advantages of this utility model are as follows: the anti-corrosion lining is made of PFA plastic, which is fusible polytetrafluoroethylene. Its material properties give the anti-corrosion lining excellent corrosion resistance and high temperature resistance. The anti-corrosion lining covers the inner wall of the reducing steel pipe and wraps the spliced ​​tapered pipe and the reinforced straight pipe, meeting the requirements of corrosion resistance and high temperature resistance of the reducing pipe. The combined steel frame is located inside the side wall of the anti-corrosion lining, providing support for the anti-corrosion lining. Compared with the existing pipes that combine steel pipe and lining, this reducing pipe has higher structural strength, is less affected by the high pressure generated during operation, and can withstand greater pressure without breaking. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a cross-sectional view of the present invention;

[0014] Figure 3 This is a partially enlarged cross-sectional view of the present invention;

[0015] Figure 4 This is a drawing of the sector-shaped part of this utility model;

[0016] In the diagram: 1. Reducing steel pipe; 2. Reinforced straight pipe; 3. Fan-shaped plate; 4. Sealing flange; 5. Limiting ring; 6. Mounting flange; 7. Anti-corrosion lining; 9. Limiting hole; 10. Arc-shaped convex strip; 11. Main positioning strip; 12. Main fixing strip. Detailed Implementation

[0017] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings, but the protection scope of this utility model is not limited to the described embodiments.

[0018] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0019] In the description of this utility model, it should be understood that the terms "left", "right", "front", "back", "up", "down", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Example 1:

[0021] like Figure 1-4 As shown, the present invention provides a corrosion-resistant and high-temperature resistant steel-lined PFA reducer, comprising: a reducing steel pipe 1, a combined steel frame, and an anti-corrosion liner 7; the combined steel frame includes a spliced ​​tapered pipe and a reinforced straight pipe 2; the spliced ​​tapered pipe and the reinforced straight pipe 2 are coaxially installed in the tapered and straight sections of the reducing steel pipe 1, respectively, and the inner end of the spliced ​​tapered pipe is connected to the inner end of the reinforced straight pipe 2; the anti-corrosion liner 7 covers the inner wall of the reducing steel pipe 1 and has a uniform thickness; the anti-corrosion liner 7 wraps around the spliced ​​tapered pipe and the reinforced straight pipe 2.

[0022] The anti-corrosion liner 7 is made of PFA plastic, which is fusible polytetrafluoroethylene. Its material properties give the anti-corrosion liner 7 excellent corrosion resistance and high temperature resistance. The anti-corrosion liner 7 covers the inner wall of the reducing steel pipe 1 and wraps the spliced ​​tapered pipe and the reinforced straight pipe 2, meeting the requirements of corrosion resistance and high temperature resistance of the reducing pipe. The composite steel frame is located inside the side wall of the anti-corrosion liner 7, providing support for the anti-corrosion liner 7. Compared with the existing pipes that combine steel pipes and liner, this reducing pipe has higher structural strength, is less affected by the high pressure generated during operation, and can withstand greater pressure without breaking.

[0023] Furthermore, the assembled tapered tube includes multiple sector-shaped pieces 3; the sector-shaped pieces 3 have an arc; a snap-fit ​​protrusion 13 is provided on one straight edge of the sector-shaped piece 3, and a snap-fit ​​groove is provided on the other straight edge; the snap-fit ​​protrusion 13 of each sector-shaped piece 3 snaps into the snap-fit ​​groove of the adjacent sector-shaped piece to form a conical assembled tapered tube; multiple main fixing strips 12 are fixed at intervals and at an angle on the inner wall of the tapered section of the reducing steel pipe 1, and the adjacent main fixing strips 12 are inclined in opposite directions; a main positioning strip 11 is fixed at an angle on the outer wall of each sector-shaped piece 3; the edges of the main positioning strips 11 on each sector-shaped piece 3 are snapped between each main fixing strip 12 and the inner wall of the tapered section of the reducing steel pipe 1.

[0024] The cooperation between the main fixing strip 12 and the main positioning strip 11 can limit the position of the sector piece 3 and provide radial and axial positioning for the assembled tapered tube. The assembled tapered tube is formed by combining multiple sector pieces 3, which facilitates segmented installation and allows each sector piece to slide along the main fixing strip 12. After installation, the mating edges of two adjacent sector pieces are welded to further improve the structural strength of the assembled tapered tube. The main positioning strip 11 can act as a reinforcing rib to improve the structural strength of the sector piece 3.

[0025] Furthermore, several limiting holes 9 are provided on the reinforced straight pipe 2 and each sector plate 3, and the anti-corrosion lining 7 penetrates and fills each limiting hole 9. By using the anti-corrosion lining 7 to penetrate and fill the limiting holes 9, the bonding between the combined steel frame and the anti-corrosion lining 7 can be improved, further ensuring the supporting effect of the combined steel frame on the anti-corrosion lining 7.

[0026] Furthermore, multiple arc-shaped protrusions 10 are spaced apart on the inner end of the assembled tapered tube; each arc-shaped protrusion 10 is distributed on each fan-shaped piece 3; multiple arc-shaped grooves are provided on the inner end edge of the reinforced straight tube 2; each arc-shaped protrusion 10 is inserted into each arc-shaped groove.

[0027] By using the insertion fit between the arc-shaped protrusion 10 and the arc-shaped groove, the spliced ​​tapered tube and the reinforced straight tube 2 can be connected. After installation, the inner ends of the spliced ​​tapered tube and the reinforced straight tube 2 can be welded to enhance the connection strength.

[0028] Furthermore, multiple pairs of retaining strips are obliquely fixed on the inner wall of the straight section of the reducing steel pipe 1, and the length direction of the retaining strips is parallel to the axis of the reducing steel pipe 1; the two retaining strips in the same pair are obliquely inclined; multiple oblique positioning strips are fixed at intervals on the outer wall of the reinforcing straight pipe 2; the edge of each positioning strip is respectively snapped between each retaining strip and the inner wall of the straight section of the reducing steel pipe 1.

[0029] The cooperation between the fixing strip and the positioning strip can achieve circumferential and radial limiting of the reinforced straight pipe 2, preventing the reinforced straight pipe 2 and the anti-corrosion lining 7 from rotating circumferentially. At the same time, the positioning strip can act as a reinforcing rib, further improving the structural strength of the reinforced straight pipe 2 and reducing the possibility of deformation and damage to the reinforced straight pipe 2 and the anti-corrosion lining 7.

[0030] Furthermore, limiting rings 5 ​​are provided on the inner walls of both ends of the reducing steel pipe 1; the outer ends of the spliced ​​tapered pipe and the reinforcing straight pipe 2 are respectively pressed tightly against the opposite sides of the two limiting rings 5; the anti-corrosion lining 7 wraps around the two limiting rings 5. The limiting rings 5 ​​are used to limit the spliced ​​tapered pipe and the reinforcing straight pipe 2, preventing axial displacement of the spliced ​​tapered pipe, the reinforcing straight pipe 2, and the anti-corrosion lining 7.

[0031] Furthermore, mounting flanges 6 are fixed to both ends of the reducing steel pipe 1; sealing flanges 4 are integrally installed at both ends of the anti-corrosion lining 7; the two sealing flanges 4 are pressed onto the mounting flanges 6 on the corresponding sides. The mounting flanges 6 facilitate butt joint installation; during butt joint installation, the sealing flanges 4 are squeezed by the mounting flanges 6, tightly fitting with the sealing flanges of the external pipe, achieving a good sealing effect.

[0032] In the corrosion-resistant and high-temperature resistant steel-lined PFA reducer provided by this utility model, the corrosion-resistant inner lining 7 is made of PFA plastic.

[0033] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and detail may be made to the present invention without departing from the spirit and scope of the appended claims.

Claims

1. A corrosion-resistant and high-temperature-resistant steel-lined PFA reducer, characterized in that: It includes a reducing steel pipe (1), a composite steel frame and an anti-corrosion lining (7); the composite steel frame includes a spliced ​​tapered pipe and a reinforced straight pipe (2); the spliced ​​tapered pipe and the reinforced straight pipe (2) are coaxially installed inside the reducing steel pipe (1), and the inner end of the spliced ​​tapered pipe is connected to the inner end of the reinforced straight pipe (2); the anti-corrosion lining (7) covers the inner wall of the reducing steel pipe (1) and has a uniform thickness; the anti-corrosion lining (7) wraps the spliced ​​tapered pipe and the reinforced straight pipe (2).

2. The corrosion-resistant and high-temperature-resistant steel-lined PFA reducer according to claim 1, characterized in that: The assembled conical tube includes multiple fan-shaped pieces (3); a snap-fit ​​protrusion (13) is provided on one straight edge of the fan-shaped piece (3), and a snap-fit ​​groove is provided on the other straight edge; the snap-fit ​​protrusion (13) of each fan-shaped piece (3) snaps into the snap-fit ​​groove of the adjacent fan-shaped piece to form a conical assembled conical tube; multiple main fixing strips (12) are fixed at intervals on the inner wall of the conical section of the reducing steel pipe (1), and the adjacent main fixing strips (12) are inclined in opposite directions; a main positioning strip (11) is fixed at an angle on the outer wall of each fan-shaped piece (3); the edges of each main positioning strip (11) snap into each main fixing strip (12) and the inner wall of the conical section of the reducing steel pipe (1).

3. The corrosion-resistant and high-temperature-resistant steel-lined PFA reducer according to claim 2, characterized in that: Several limiting holes (9) are provided on the reinforced straight pipe (2) and each sector plate (3), and the anti-corrosion lining (7) penetrates and fills each limiting hole (9).

4. The corrosion-resistant and high-temperature-resistant steel-lined PFA reducer according to claim 1, characterized in that: Multiple arc-shaped grooves are provided on the inner end edge of the reinforced straight tube (2); and arc-shaped protrusions (10) are respectively inserted into each arc-shaped groove on the inner end of the spliced ​​tapered tube.

5. The corrosion-resistant and high-temperature-resistant steel-lined PFA reducer according to claim 1, characterized in that: Multiple pairs of retaining strips are fixed obliquely on the inner wall of the straight section of the reducing steel pipe (1); the two retaining strips of the same pair are inclined in opposite directions; multiple positioning strips are fixed at intervals on the outer wall of the reinforcing straight pipe (2); the edges of each positioning strip are respectively snapped between each retaining strip and the inner wall of the straight section of the reducing steel pipe (1).

6. The corrosion-resistant and high-temperature-resistant steel-lined PFA reducer according to claim 1, characterized in that: Limiting rings (5) are provided on the inner walls of the two openings of the reducing steel pipe (1); the two limiting rings (5) are pressed tightly on the outer ends of the spliced ​​tapered pipe and the reinforced straight pipe (2); the anti-corrosion lining (7) wraps the two limiting rings (5).

7. The corrosion-resistant and high-temperature-resistant steel-lined PFA reducer according to claim 1, characterized in that: Mounting flanges (6) are fixed on both ends of the reducing steel pipe (1); sealing flanges (4) are integrally installed on the two ends of the anti-corrosion lining (7) and pressed tightly against the corresponding mounting flanges (6).

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