Seamless steel tube with high acid resistance

Abstract

The utility model relates to the technical field of steel pipes, and discloses a high acid-resistant seamless steel pipe, a steel pipe A and a steel pipe B are connected through a connecting assembly, the connecting assembly comprises an acid-resistant ring A fixedly installed on the left side of the steel pipe A, an acid-resistant ring B fixedly installed on the right side of the steel pipe B, a sealing ring and a fixing assembly, and a sealing groove A is formed in the left side wall of the acid-resistant ring A; a protruding ring A is fixedly arranged on the right side of the acid-resistant ring B. The sealing ring is located in the sealing groove A. The protruding ring A is inserted into the sealing groove A and connected with the sealing ring in an abutting mode. The acid-resistant ring A and the acid-resistant ring B are fixedly connected through fixing assemblies. The steel pipe A and the steel pipe B are fixedly connected through fixing assemblies. The inner side walls of the steel pipe A and the steel pipe B are each provided with an acid-resistant coating. The stainless steel pipe joint has the advantages that acid resistance is enhanced, the steel pipe A and the steel pipe B are prevented from being corroded, and the problem that chemical liquid leaks due to the fact that the joint of a seamless steel pipe is corroded most easily is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipes, in particular to a highly acid-resistant seamless steel pipe. Background Art

[0002] Seamless steel pipe is a steel pipe made by perforating a whole round steel bar. There is no weld on the surface. It is called seamless steel pipe. According to the production method, seamless steel pipe can be divided into hot-rolled seamless steel pipe, cold-rolled seamless steel pipe, extruded seamless steel pipe, etc. According to the cross-sectional shape, seamless steel pipe can be divided into round and special-shaped. Special-shaped pipes have various complex shapes such as square, triangle, hexagon, etc.

[0003] Seamless steel pipes have a wide range of applications, so their use environments are also complex and diverse. Some seamless steel pipes are used to transport chemical liquids. When the chemical liquid being transported is highly acidic, due to the limited acid resistance of seamless steel pipes, long-term use can easily lead to corrosion of seamless steel pipes, especially the joints of seamless steel pipes are most susceptible to corrosion, which can lead to leakage of chemical liquids. Utility Model Content

[0004] The utility model aims to provide a highly acid-resistant seamless steel pipe to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a highly acid-resistant seamless steel pipe, comprising a steel pipe A and a steel pipe B located on the left side of the steel pipe A, characterized in that: the steel pipe A and the steel pipe B are connected by a connecting assembly, the connecting assembly comprises an acid-resistant ring A fixedly installed on the left side of the steel pipe A, an acid-resistant ring B fixedly installed on the right side of the steel pipe B, a sealing ring, and a fixing assembly, a sealing groove A is opened on the left side wall of the acid-resistant ring A, a convex ring A is fixedly arranged on the right side of the acid-resistant ring B, the sealing ring is located inside the sealing groove A, the convex ring A is inserted into the sealing groove A and is in contact with the sealing ring, the acid-resistant ring A and the acid-resistant ring B, the steel pipe A and the steel pipe B are all fixedly connected by the fixing assembly, and the inner walls of the steel pipe A and the steel pipe B are both provided with acid-resistant coatings.

[0006] Preferably, the fixing assembly includes a flange sleeve A fixedly installed on the steel pipe A, a flange sleeve B fixedly installed on the steel pipe B, and a plurality of bolts. The outer sides of the acid-resistant ring A and the acid-resistant ring B are fixedly provided with a fixing ring A, and the inner sides of the flange sleeve A and the flange sleeve B are fixedly provided with a fixing ring B. The diameter of the fixing ring A is larger than the inner diameter of the fixing ring B. The fixing ring A is located between the fixing ring B and the steel pipe A and is fixedly connected to the steel pipe A. The flange sleeve A and the flange sleeve B are fixedly connected by bolts.

[0007] Preferably, the outer sides of the steel pipe A and the steel pipe B are both provided with threads A, the inner sides of the flange sleeve A and the flange sleeve B are both provided with threads B, and the steel pipe A is fixedly connected to the flange sleeve A through threads A and B.

[0008] Preferably, a positioning hole is formed on the flange sleeve A, and a positioning column is fixedly provided on the flange sleeve B. The positioning column is inserted into the positioning hole and is in contact and connection with the flange sleeve A.

[0009] Preferably, a convex ring B is fixedly provided on the left side of the steel pipe A and the right side of the steel pipe B, a sealing sleeve is wrapped on the convex ring B, a sealing groove B is opened on the right side wall of the acid-resistant ring A and the left side wall of the acid-resistant ring B, and after the convex ring B is inserted into the sealing groove B, the sealing sleeve is in contact with the acid-resistant ring A.

[0010] Preferably, the flange sleeve A and the flange sleeve B are both fixedly provided with a plurality of anti-slip strips.

[0011] Preferably, the sealing ring and the sealing sleeve are both made of fluororubber, the acid-resistant ring A and the acid-resistant ring B are both made of ceramic materials, and the acid-resistant coating is made of acid-resistant paint.

[0012] The beneficial effects of the utility model are as follows: when the utility model is used, the acid-resistant ring A is placed on the left side of the steel pipe A and is connected to the steel pipe A in a conflicting manner, the flange sleeve A is placed on the left side of the acid-resistant ring A, the flange sleeve A is screwed onto the steel pipe A and is fixedly connected to the steel pipe A through the thread A and the thread B, after the flange sleeve A is fixed to the steel pipe A, the fixing ring A will be fixed between the fixing ring B and the steel pipe A, so that the acid-resistant ring A is fixedly connected to the steel pipe A, and then the acid-resistant ring B is fixedly connected to the steel pipe B in the same way; the convex ring A is inserted into the sealing groove A and is connected to the sealing ring in a conflicting manner, and then the flange sleeve A is fixedly connected to the flange sleeve B through bolts, so that the acid-resistant ring A is fixedly connected to the acid-resistant ring B, and then the sealing ring is fixed between the convex ring A and the acid-resistant ring A, It plays a sealing role to prevent liquid from leaking from the connection; since acid-resistant coatings are provided on the inner walls of steel pipe A and steel pipe B, it plays a role in enhancing the acid resistance and preventing the inner walls of steel pipe A and steel pipe B from being corroded; since acid-resistant rings A and acid-resistant rings B are provided between steel pipe A and steel pipe B, it plays a role in enhancing the acid resistance and preventing the connection from being corroded; in summary, the utility model has the beneficial effect of enhancing the acid resistance and preventing the steel pipe A and steel pipe B from being corroded, and solves the problem that when the transported chemical liquid is highly acidic, the seamless steel pipe is easily corroded due to its limited acid resistance, especially the connection of the seamless steel pipe is most susceptible to corrosion, which will lead to the leakage of chemical liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a structural schematic diagram of the utility model;

[0014] Attached Figure 2 It is a front view of the utility model;

[0015] Attached Figure 3 For attachment Figure 2Sectional view at AA;

[0016] Attached Figure 4 For attachment Figure 3 Enlarged view of point A in the middle.

[0017] In the figure: steel pipe A1, steel pipe B2, acid-resistant ring A3, acid-resistant ring B4, sealing ring 5, sealing groove A6, convex ring A7, flange sleeve A8, flange sleeve B9, bolt 10, fixing ring A11, fixing ring B12, thread A13, thread B14, positioning hole 15, positioning column 16, convex ring B17, sealing sleeve 18, sealing groove B19, anti-slip strip 20. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] like Figure 1-4As shown, the utility model discloses a highly acid-resistant seamless steel pipe, comprising a steel pipe A1 and a steel pipe B2 located on the left side of the steel pipe A1, wherein the steel pipe A1 and the steel pipe B2 are connected via a connecting assembly, wherein the connecting assembly comprises an acid-resistant ring A3 fixedly installed on the left side of the steel pipe A1, an acid-resistant ring B4 fixedly installed on the right side of the steel pipe B2, a sealing ring 5, and a fixing assembly, wherein a sealing groove A6 is provided on the left side wall of the acid-resistant ring A3, a convex ring A7 is fixedly provided on the right side of the acid-resistant ring B4, the sealing ring 5 is located inside the sealing groove A6, the convex ring A7 is inserted into the sealing groove A6 and is in contact with the sealing ring 5, the acid-resistant ring A3 and the acid-resistant ring B4, the steel pipe A1 and the steel pipe B2 are all fixedly connected via the fixing assembly, and an acid-resistant coating is provided on the inner side walls of the steel pipe A1 and the steel pipe B2. When the utility model is used, the acid-resistant ring A3 is placed on the left side of the steel pipe A1 and is in contact with the steel pipe A1, the flange sleeve A8 is placed on the left side of the acid-resistant ring A3, the flange sleeve A8 is screwed onto the steel pipe A1 and is fixedly connected to the steel pipe A1 through the thread A13 and the thread B14, after the flange sleeve A8 is fixed to the steel pipe A1, the fixing ring A11 will be fixed between the fixing ring B12 and the steel pipe A1, so that the acid-resistant ring A3 is fixedly connected to the steel pipe A1, and then the acid-resistant ring B4 is fixedly connected to the steel pipe B2 in the same way; the convex ring A7 is inserted into the sealing groove A6 and is in contact with the sealing ring 5, and then the flange sleeve A8 is fixedly connected to the flange sleeve B9 through the bolt 10, so that the acid-resistant ring A3 is fixedly connected to the acid-resistant ring B4, and then the sealing ring 5 is fixed between the convex ring A7 and the acid-resistant Ring A3 plays a sealing role to prevent liquid from leaking from the connection; since acid-resistant coating is provided on the inner walls of steel pipe A1 and steel pipe B2, acid resistance is enhanced to prevent the inner walls of steel pipe A1 and steel pipe B2 from being corroded; since acid-resistant ring A3 and acid-resistant ring B4 are provided between steel pipe A1 and steel pipe B2, acid resistance is enhanced to prevent the connection from being corroded; in summary, the utility model has the beneficial effect of enhancing acid resistance and preventing steel pipe A1 and steel pipe B2 from being corroded, and solves the problem that when the transported chemical liquid is highly acidic, the seamless steel pipe is easily corroded due to limited acid resistance, especially the connection of the seamless steel pipe is most susceptible to corrosion, which will lead to leakage of chemical liquid.

[0020] Preferably, the fixing assembly includes a flange sleeve A8 fixedly mounted on the steel pipe A1, a flange sleeve B9 fixedly mounted on the steel pipe B2, and a plurality of bolts 10. A fixing ring A11 is fixedly mounted on the outside of the acid-resistant ring A3 and the acid-resistant ring B4. A fixing ring B12 is fixedly mounted on the inside of the flange sleeve A8 and the flange sleeve B9. The diameter of the fixing ring A11 is larger than the inner diameter of the fixing ring B12. The fixing ring A11 is located between the fixing ring B12 and the steel pipe A1 and is fixedly connected to the steel pipe A1. The flange sleeve A8 is fixedly connected to the flange sleeve B9 by bolts 10. Since the diameter of the fixing ring A11 is larger than the inner diameter of the fixing ring B12, the fixing ring A11 is clamped to prevent the acid-resistant ring A3 from moving. Since the flange sleeve A8 is fixedly connected to the flange sleeve B9 by bolts 10, the flange sleeve A8 is convenient for disassembly and assembly.

[0021] Preferably, the outer sides of the steel pipe A1 and the steel pipe B2 are both provided with threads A13, the inner sides of the flange sleeve A8 and the flange sleeve B9 are both provided with threads B14, and the steel pipe A1 is fixedly connected to the flange sleeve A8 through the threads A13 and B14. Since the steel pipe A1 is fixedly connected to the flange sleeve A8 through the threads A13 and B14, it is convenient to disassemble and assemble the flange sleeve A8 and the steel pipe A1.

[0022] Preferably, the flange sleeve A8 is provided with a positioning hole 15, and the flange sleeve B9 is fixedly provided with a positioning column 16, and the positioning column 16 is inserted into the positioning hole 15 and is in contact with the flange sleeve A8. Since the positioning column 16 is inserted into the positioning hole 15 and is in contact with the flange sleeve A8, the flange sleeve A8 is positioned when the flange sleeve A8 and the flange sleeve B9 are installed.

[0023] Preferably, a convex ring B17 is fixedly provided on the left side of the steel pipe A1 and the right side of the steel pipe B2, and a sealing sleeve 18 is wrapped on the convex ring B17. A sealing groove B19 is provided on the right side wall of the acid-resistant ring A3 and the left side wall of the acid-resistant ring B4. After the convex ring B17 is inserted into the sealing groove B19, the sealing sleeve 18 is in contact with the acid-resistant ring A3. Since the sealing sleeve 18 is in contact with the acid-resistant ring A3 after the convex ring B17 is inserted into the sealing groove B19, the sealing performance is enhanced and liquid leakage is prevented.

[0024] Preferably, the flange sleeve A8 and the flange sleeve B9 are both fixedly provided with a plurality of anti-slip strips 20. Since the flange sleeve A8 and the flange sleeve B9 are both fixedly provided with a plurality of anti-slip strips 20, the flange sleeve A8 and the flange sleeve B9 are prevented from slipping when twisting.

[0025] Preferably, the sealing ring 5 and the sealing sleeve 18 are made of fluororubber, the acid-resistant ring A3 and the acid-resistant ring B4 are made of ceramic materials, and the acid-resistant coating is made of acid-resistant paint. Since the sealing ring 5 and the sealing sleeve 18 are made of fluororubber, they have the characteristics of good corrosion resistance and good sealing; since the acid-resistant ring A3 and the acid-resistant ring B4 are made of ceramic materials, they have the characteristics of high corrosion resistance and high wear resistance; since the acid-resistant coating is made of acid-resistant paint, it plays a role in making the inner wall of the steel pipe A1 and the steel pipe B2 have good acid resistance.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly acid-resistant seamless steel pipe, comprising a steel pipe A (1) and a steel pipe B (2) located on the left side of the steel pipe A (1), characterized in that: The steel pipe A (1) and the steel pipe B (2) are connected by a connecting assembly, wherein the connecting assembly comprises an acid-resistant ring A (3) fixedly mounted on the left side of the steel pipe A (1), an acid-resistant ring B (4) fixedly mounted on the right side of the steel pipe B (2), a sealing ring (5), and a fixing assembly. A sealing groove A (6) is provided on the left side wall of the acid-resistant ring A (3), a convex ring A (7) is fixedly mounted on the right side of the acid-resistant ring B (4), the sealing ring (5) is located inside the sealing groove A (6), the convex ring A (7) is inserted into the sealing groove A (6) and is abutted against the sealing ring (5), the acid-resistant ring A (3) and the acid-resistant ring B (4), the steel pipe A (1) and the steel pipe B (2) are all fixedly connected by the fixing assembly, and an acid-resistant coating is provided on the inner side walls of the steel pipe A (1) and the steel pipe B (2).

2. The highly acid-resistant seamless steel pipe according to claim 1, characterized in that: The fixing assembly comprises a flange sleeve A (8) fixedly mounted on a steel pipe A (1), a flange sleeve B (9) fixedly mounted on a steel pipe B (2), and a plurality of bolts (10). A fixing ring A (11) is fixedly mounted on the outer sides of the acid-resistant ring A (3) and the acid-resistant ring B (4). A fixing ring B (12) is fixedly mounted on the inner sides of the flange sleeve A (8) and the flange sleeve B (9). The diameter of the fixing ring A (11) is larger than the inner diameter of the fixing ring B (12). The fixing ring A (11) is located between the fixing ring B (12) and the steel pipe A (1) and is fixedly connected to the steel pipe A (1). The flange sleeve A (8) and the flange sleeve B (9) are fixedly connected by bolts (10).

3. A highly acid-resistant seamless steel pipe according to claim 2, characterized in that: The outer sides of the steel pipe A (1) and the steel pipe B (2) are both provided with threads A (13), and the inner sides of the flange sleeve A (8) and the flange sleeve B (9) are both provided with threads B (14). The steel pipe A (1) is fixedly connected to the flange sleeve A (8) via the threads A (13) and the threads B (14).

4. A highly acid-resistant seamless steel pipe according to claim 3, characterized in that: The flange sleeve A (8) is provided with a positioning hole (15), and the flange sleeve B (9) is fixedly provided with a positioning column (16), and the positioning column (16) is inserted into the positioning hole (15) and is in contact with and connected to the flange sleeve A (8).

5. The highly acid-resistant seamless steel pipe according to claim 4, characterized in that: A convex ring B (17) is fixedly provided on the left side of the steel pipe A (1) and the right side of the steel pipe B (2), and a sealing sleeve (18) is wrapped around the convex ring B (17). A sealing groove B (19) is provided on the right side wall of the acid-resistant ring A (3) and the left side wall of the acid-resistant ring B (4). After the convex ring B (17) is inserted into the sealing groove B (19), the sealing sleeve (18) is abutted and connected with the acid-resistant ring A (3).

6. A highly acid-resistant seamless steel pipe according to claim 5, characterized in that: A plurality of anti-slip strips (20) are fixedly arranged on the flange sleeve A (8) and the flange sleeve B (9).

7. The highly acid-resistant seamless steel pipe according to claim 6, characterized in that: The sealing ring (5) and the sealing sleeve (18) are both made of fluororubber, the acid-resistant ring A (3) and the acid-resistant ring B (4) are both made of ceramic materials, and the acid-resistant coating is made of acid-resistant paint.

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