High-corrosion-resistance stainless steel seamless steel tube for refining

Abstract

The utility model discloses a high-corrosion-resistance stainless steel seamless steel pipe for refining, which comprises a main body, the main body comprises a seamless steel pipe and a ceramic inner pipe, a plurality of raised lines are arrayed on the periphery of the ceramic inner pipe, two ends of the ceramic inner pipe are respectively provided with an external thread end, and the high-corrosion-resistance stainless steel seamless steel pipe further comprises two ceramic plugs respectively arranged at two ends of the seamless steel pipe. A connecting ring is arranged at the inner end of the ceramic plug, a circle of limiting ring is further arranged on the ceramic plug on the inner circumference of the connecting ring, a first graphite sealing ring is further arranged at the joint of the limiting ring and the connecting ring, the connecting ring is connected to the external thread end in a threaded mode, a second graphite sealing ring is further arranged on the outer side of the connecting ring, and the outer circumference of the second graphite sealing ring abuts against the inner wall of the seamless steel pipe. The corrosion-resistant high-temperature-resistant heat-preservation pipe fitting has the advantages that the corrosion-resistant high-temperature-resistant heat-preservation pipe fitting is high in corrosion resistance and simple to assemble, and a certain heat-preservation function can be realized by the corrosion-resistant high-temperature-resistant heat-preservation pipe fitting.

Description

TECHNICAL FIELD

[0001] The utility model relates to a high corrosion -resistant stainless steel seamless tube for refining. BACKGROUND

[0002] The stainless steel seamless tube is often used for conveying refining products in the prior art, some of these media have certain corrosiveness, the inner wall of the stainless steel seamless tube is easy to be corroded for long time in this environment, which results in low service life of the stainless steel seamless tube. SUMMARY

[0003] The utility model aims at overcoming the insufficient of prior art, provide a high corrosion -resistant stainless steel seamless tube for refining, can improve its service life.

[0004] The utility model discloses a high corrosion -resistant stainless steel seamless tube for refining, including the main part, the main part includes the seamless tube and sets up the ceramic inner tube in the seamless tube,

[0005] The outer periphery of the ceramic inner tube is provided with a plurality of convex strips, the ceramic inner tube is inserted into the seamless tube, each convex strip abuts against the inner part of the seamless tube, and the two ends of the ceramic inner end are respectively provided with external thread ends, and the two ends of each convex strip are respectively spaced apart from the two external thread ends of the ceramic inner tube.

[0006] Further comprising two ceramic plugs respectively arranged at both ends of the seamless tube, the ceramic plug is annular, the inner end of the ceramic plug is provided with a connecting ring corresponding to the external thread end, the ceramic plug on the inner periphery of the connecting ring is further provided with a limiting ring protruding inward, the connecting part of the limiting ring and the connecting ring is further provided with a first graphite sealing ring, the connecting ring is screwed on the external thread end, the outer side of the connecting ring is further provided with a second graphite sealing ring, the outer periphery of the second graphite sealing ring abuts against the inner wall of the seamless tube, and the end part of the ceramic inner tube abuts against the limiting ring and the first graphite sealing ring.

[0007] The outer wall of the seamless tube is further provided with a corrosion -resistant coating.

[0008] Specifically, the outer diameter of the ceramic plug is consistent with the outer diameter of the seamless tube.

[0009] Specifically, the end part of the convex strip and the connecting ring are spaced apart.

[0010] Further, the first sealing ring is further arranged between the ceramic plug and the end part of the seamless tube.

[0011] Specifically, the outer end of the ceramic plug is further provided with an arc chamfer.

[0012] Further, the connecting piece is further connected to the two main parts.

[0013] Further, the two ends of the main body are respectively provided with connecting parts, and the two connecting parts and the connecting piece are respectively provided with corresponding connecting holes.

[0014] Further, the connecting piece is a ring-shaped connecting piece, and the two ends of the connecting piece are respectively provided with insertion ends corresponding to the ceramic plugs.

[0015] Further, the outer ends of the two ceramic plugs are respectively provided with a circle of mounting grooves, the mounting grooves are provided with second sealing rings, and the two ends of the connecting part are respectively provided with sealing grooves corresponding to the second sealing rings, and the end portions of the second sealing rings are clamped into the sealing grooves.

[0016] Further, the connecting part is provided with a third graphite sealing ring.

[0017] The utility model discloses a ceramic inner tube and seamless steel pipe are connected through the ceramic plug, and the ceramic plug is provided with two graphite sealing rings, and the ceramic plug is provided with a circle of mounting grooves, and the mounting grooves are provided with second sealing rings, and the two ends of the connecting part are respectively provided with sealing grooves corresponding to the second sealing rings, and the end portions of the second sealing rings are clamped into the sealing grooves. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the sectional view of the utility model;

[0019] Figure 2 is the sectional view of the two main bodies connected in the utility model;

[0020] Figure 3 is Figure 2 the enlarged view of A part in the utility model.

[0021] In the drawing: seamless steel pipe 1, ceramic inner tube 2, convex strip 3, outer thread end 4, ceramic plug 5, connecting ring 6, limiting ring 7, first graphite sealing ring 8, second graphite sealing ring 9, corrosion -resistant coating 10, connecting piece 12, connecting part 13, insertion end 14, first sealing ring 15, second sealing ring 16, third graphite sealing ring 17. DETAILED DESCRIPTION

[0022] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0023] Combination Figures 1-3 As shown, a high corrosion resistant stainless steel seamless steel pipe for refining and chemical processing includes a main body, which includes a seamless steel pipe 1 and a ceramic inner tube 2 disposed inside the seamless steel pipe 1.

[0024] The outer periphery of the ceramic inner tube 2 is arrayed with multiple protrusions 3. The ceramic inner tube 2 is inserted into the seamless steel tube 1. Each of the protrusions 3 abuts against the interior of the seamless steel tube 1. The two ends of the ceramic inner tube 2 are respectively provided with external threaded ends 4. The two ends of each of the protrusions 3 are respectively kept at a distance from the two external threaded ends 4 of the ceramic inner tube 2.

[0025] It also includes two ceramic plugs 5 respectively disposed at both ends of the seamless steel pipe 1. The ceramic plugs 5 are annular. The inner end of the ceramic plugs 5 has a connecting ring 6 corresponding to the external thread end 4. The ceramic plugs 5 on the inner circumference of the connecting ring 6 are also provided with a limiting ring 7 protruding inward. The connection between the limiting ring 7 and the connecting ring 6 is also provided with a first graphite sealing ring 8. The connecting ring 6 is screwed onto the external thread end 4. The outer side of the connecting ring 6 is also provided with a second graphite sealing ring 9. The outer circumference of the second graphite sealing ring 9 abuts against the inner wall of the seamless steel pipe 1. The end of the ceramic inner tube 2 abuts against the limiting ring 7 and the first graphite sealing ring 8.

[0026] The outer wall of the seamless steel pipe 1 is also provided with a corrosion-resistant coating 10.

[0027] In the above structure, the ceramic inner tube 2 has high corrosion resistance. After the ceramic inner tube 2 is inserted into the seamless steel pipe 1, both ends are limited by ceramic plugs 5. The ceramic plugs 5 seal the gap between the ceramic inner tube 2 and the seamless steel pipe 1 through themselves and the two graphite sealing rings, which can effectively prevent the transported medium from entering the gap between the ceramic inner tube 2 and the seamless steel pipe 1 and causing corrosion to the inner wall of the seamless steel pipe 1. The outer wall of the seamless steel pipe 1 is provided with a corrosion-resistant coating 10, which can effectively improve the service life of the seamless steel pipe 1. In addition, the above structure also has the advantage of simple assembly. During assembly, after the ceramic inner tube 2 is placed into the seamless steel pipe 1, due to the setting of the limiting rings 7, the two ceramic plugs 5 can be directly screwed to the two ends of the main body. Finally, the ceramic inner tube 2 abuts against the inner wall of the steel pipe through the protrusions 3, forming multiple cavities, which also has a good heat preservation effect.

[0028] In another embodiment, such as Figure 1 As shown, the outer diameter of the ceramic plug 5 is consistent with the outer diameter of the seamless steel pipe 1.

[0029] In another embodiment, such as Figure 1 As shown, a gap is maintained between the end of the protrusion 3 and the connecting ring 6.

[0030] In another embodiment, a first sealing ring 15 is further arranged between the ceramic plugs 5 and the end of the seamless steel pipe 1.

[0031] In another embodiment, as shown in Figure 1 , the outer end of the ceramic plug 5 is further provided with an arc-shaped chamfer to avoid damage to the outer end of the ceramic plug 5 caused by impact.

[0032] In another embodiment, as shown in Figure 2 and Figure 3 , a connecting piece 12 is further included, which connects the two main bodies.

[0033] In another embodiment, as shown in Figure 2 and Figure 3 , the two ends of the main body are respectively provided with connecting parts 13, and the two connecting parts 13 and the connecting piece 12 are respectively provided with corresponding connecting holes, and the two connecting parts 13 and the connecting piece 12 are connected by bolts and nuts to ensure the reliability of the connection between the two main bodies.

[0034] In another embodiment, as shown in Figure 2 and Figure 3 , the connecting piece 12 is a ring-shaped connecting piece, and the two ends of the connecting piece 12 are respectively provided with insertion ends 14 corresponding to the ceramic plugs 5, and the two insertion ends 14 are respectively inserted into the corresponding ceramic plugs 5 to further ensure the reliability of the connection between the two main bodies.

[0035] In another embodiment, as shown in Figure 2 and Figure 3 , the outer end of the two ceramic plugs 5 is further provided with a ring-shaped mounting groove, and the mounting groove is provided with a second sealing ring 16, and the two ends of the connecting part 13 are respectively provided with sealing grooves corresponding to the second sealing ring 16, and the end of the second sealing ring 16 is clamped into the sealing groove to ensure the reliability of the connection between the ceramic plug 5 and the connecting piece 12.

[0036] In another embodiment, as shown in Figure 2 and Figure 3 , a third graphite sealing ring 17 is further arranged at the connection between the insertion end 14 and the ceramic plug 5 to further ensure the reliability of the connection between the ceramic plug 5 and the connecting piece 12.

Claims

1. A high corrosion-resistant seamless steel pipe for refining, comprising a main body, characterized in that, The main body comprises a seamless steel pipe (1) and a ceramic inner pipe (2) arranged in the seamless steel pipe (1); The ceramic inner pipe (2) is provided with a plurality of protrusions (3) on the outer periphery, the ceramic inner pipe (2) is inserted into the seamless steel pipe (1), each protrusion (3) abuts against the inner portion of the seamless steel pipe (1), and the two ends of the ceramic inner pipe (2) are respectively provided with external threaded ends (4), the two ends of each protrusion (3) are spaced apart from the two external threaded ends (4) of the ceramic inner pipe (2). The main body further comprises two ceramic plugs (5) arranged at the two ends of the seamless steel pipe (1) respectively, the ceramic plug (5) is annular, the inner end of the ceramic plug (5) is provided with a connecting ring (6) corresponding to the external threaded end (4), the ceramic plug (5) is further provided with a limiting ring (7) protruding inwardly at the inner periphery of the connecting ring (6), a first graphite sealing ring (8) is further arranged at the connecting position of the limiting ring (7) and the connecting ring (6), the connecting ring (6) is screwed on the external threaded end (4), a second graphite sealing ring (9) is further arranged outside the connecting ring (6), the outer periphery of the second graphite sealing ring (9) abuts against the inner wall of the seamless steel pipe (1), and the end portion of the ceramic inner pipe (2) abuts against the limiting ring (7) and the first graphite sealing ring (8). The outer wall of the seamless steel pipe (1) is further provided with a corrosion-resistant coating (10).

2. The high corrosion-resistant seamless steel pipe for refining according to claim 1, wherein the steel pipe is characterized by The outer diameter of the ceramic plug (5) is consistent with the outer diameter of the seamless steel pipe (1).

3. The high corrosion-resistant stainless steel seamless pipe for refining and chemical processing as described in claim 2, characterized in that, The end portion of the protrusion (3) is spaced apart from the connecting ring (6).

4. The high corrosion-resistant stainless steel seamless pipe for refining and chemical processing as described in claim 3, characterized in that, The ceramic plug (5) is further provided with a first sealing ring (15) between the end portion and the seamless steel pipe (1).

5. The high corrosion-resistant seamless steel pipe for use in oil refining according to claim 4, wherein the steel pipe is used in a hydrogen gas line of a hydrogen compressor. The outer end of the ceramic plug (5) is further provided with an arc-shaped chamfer.

6. The high corrosion-resistant seamless steel pipe for use in oil refining according to claim 5, wherein the steel pipe is used in a hydrogen reformer. The main body further comprises a connecting piece (12) connecting two main bodies.

7. The high corrosion-resistant stainless steel seamless pipe for refining and chemical processing as described in claim 6, characterized in that, The two ends of the main body are respectively provided with connecting portions (13), the connecting piece (12) and the two connecting portions (13) are respectively provided with corresponding connecting holes, and the connecting piece (12) and the two connecting portions (13) are connected through bolts and nuts.

8. The high corrosion-resistant stainless steel seamless pipe for refining and chemical processing as described in claim 7, characterized in that, The connecting piece (12) is an annular connecting piece, the two ends of the connecting piece (12) are respectively provided with insertion ends (14) corresponding to the ceramic plugs (5), and the two insertion ends (14) are respectively inserted into the corresponding ceramic plugs (5).

9. The high corrosion-resistant stainless steel seamless pipe for refining and chemical processing as described in claim 8, characterized in that, The outer end of the ceramic plug (5) is further provided with a mounting groove, the mounting groove is provided with a second sealing ring (16), the two ends of the connecting portion (13) are respectively provided with sealing grooves corresponding to the second sealing ring (16), and the end portion of the second sealing ring (16) is clamped into the sealing groove.

10. The high corrosion-resistant stainless steel seamless pipe for refining and chemical processing as described in claim 9, characterized in that, The connecting position of the insertion end (14) and the ceramic plug (5) is further provided with a third graphite sealing ring (17).

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