High-strength corrosion-resistant composite stainless steel seamless tube

Abstract

The utility model discloses a high-strength corrosion-resistant composite stainless steel seamless tube which comprises a first tube body and a second tube body which are respectively provided with a corrosion-resistant layer inside and outside, each of the first tube body and the second tube body comprises a main body and a liner tube, the front end of each main body is provided with a connecting end, and the periphery of the front end of each main body is further provided with a circle of convex ring externally provided with a limiting table. A corresponding limiting groove is formed in the front end of the liner tube, a first sealing ring is arranged at the connecting position of the protruding ring and the limiting groove, the connecting end of the first tube body is connected to the rear end of the second tube body in a threaded mode, and a second sealing ring is further arranged at the connecting position of the two main bodies. The front end of the lining pipe of the first pipe body and the rear end of the lining pipe of the second pipe body abut against the two sides of the second sealing ring respectively, and the sealing structure is longer in service life and easy to install.

Description

Technical Field

[0001] The utility model relates to a high-strength corrosion-resistant composite stainless steel seamless pipe. Background Art

[0002] Stainless steel seamless pipes are often used for conveying fluid media. In the prior art, in order to increase the service life of stainless steel seamless pipes and improve their strength and corrosion resistance, a composite process is often used to set a coating or casing on the stainless steel seamless pipe. However, this type of steel pipe has the following disadvantages: the external coating is easily damaged and cannot be repaired, which limits the service life of the stainless steel seamless pipe, and setting a casing will bring about the problem of inconvenience in installation. Utility Model Content

[0003] The utility model aims to overcome the above-mentioned deficiencies of the prior art and provide a high-strength, corrosion-resistant composite stainless steel seamless pipe with a longer service life and simple installation.

[0004] The technical scheme of the utility model is: a high-strength corrosion-resistant composite stainless steel seamless pipe, comprising a first pipe body and a second pipe body, wherein the first pipe body and the second pipe body both comprise a main body and a liner arranged on the outer periphery of the main body, the front end of the main body has a connecting end, the connecting end has an external thread, the rear end of the main body has an internal thread corresponding to the connecting end, the front end outer periphery of the main body also has a circle of convex rings, the outer periphery array of the convex rings has a plurality of limit platforms, the front end of the liner has limit grooves corresponding to the convex rings and each limit platform, the liner is sleeved on the main body, the convex rings and the limit platforms match the limit grooves, a first sealing ring is further provided at the connection between the convex rings and the limit grooves, the connecting end of the first pipe body is screwed to the rear end of the second pipe body, a second sealing ring is further provided at the main body connection of the first pipe body and the second pipe body, the front end of the liner of the first pipe body and the rear end of the liner of the first pipe body are respectively abutted against the two ends of the second sealing ring;

[0005] The first tube body and the second tube body are also provided with a first corrosion-resistant layer and a second corrosion-resistant layer inside and outside thereof, respectively.

[0006] Preferably, the outer diameter of the connecting end is smaller than the inner diameter of the main body.

[0007] Specifically, the liner is an integrally molded structure of engineering plastics.

[0008] Specifically, the convex ring and the limiting platform are an integrally formed structure of stainless steel.

[0009] Specifically, the convex ring is welded to the front end of the main body.

[0010] Specifically, the first corrosion-resistant layer is an epoxy resin layer.

[0011] Specifically, the second corrosion-resistant layer is a polyolefin coating.

[0012] Furthermore, the outer wall of the liner is densely covered with raised hemispherical particles.

[0013] The beneficial effects of the utility model are as follows: an external liner is arranged on the main body of the first tube body and the second tube body, which can improve the strength and corrosion resistance of the main body; the liner and the main body can be transported separately, and the liner is a replaceable structure. When the liner is damaged due to corrosion or impact, it can be replaced, so that the main body can be reused, thereby improving the service life of the main body; the installation method of the liner is simple and reliable, and the front and rear ends of the liner are limited after the two main bodies are connected; and the setting of the first sealing ring and the second sealing ring ensures the sealing of the joint between the liner and the main body, provides protection for the second corrosion-resistant layer on the outside of the main body, reduces the entry of water vapor, and thereby improves the service life of the second corrosion-resistant layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 yes Figure 1 Enlarged view of part A in the middle;

[0016] Figure 3 It is a structural schematic diagram of the main body in the utility model.

[0017] In the figure: a first tube body 1, a second tube body 2, a main body 3, a liner 4, a connecting end 5, a convex ring 6, a limit platform 7, a limit groove 8, a first sealing ring 9, a second sealing ring 10, a first corrosion-resistant layer 11, and a second corrosion-resistant layer 12. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0019] Combination Figure 1-3 As shown, a high-strength, corrosion-resistant composite stainless steel seamless pipe comprises a first pipe body 1 and a second pipe body 2;

[0020] The first tube body 1 and the second tube body 2 both include a main body 3 and a liner 4 arranged on the outer periphery of the main body 3. The front end of the main body 3 has a connecting end 5, and the connecting end 5 has an external thread. The rear end of the main body 3 has an internal thread corresponding to the connecting end 5. The front end periphery of the main body 3 also has a circle of convex rings 6, and the convex ring 6 has a plurality of limit platforms 7 arrayed on the periphery. The front end of the liner 4 has limit grooves 8 corresponding to the convex rings 6 and the limit platforms 7. The liner 4 is sleeved on the main body 3, and the convex rings 6 and the limit platforms 7 match the limit grooves 8 to prevent the liner 4 from rotating. The connection between the convex rings 6 and the limit grooves 8 is also provided with a first sealing A sealing ring 9 is provided to reduce the corrosion of the main body 3 caused by water vapor entering through the joint between the liner 4 and the main body 3. The connecting end 5 of the first tube body 1 is screwed to the rear end of the second tube body 2. A second sealing ring 10 is also provided at the connection between the main body 3 of the first tube body 1 and the second tube body 2. The front end of the liner 4 of the first tube body 1 and the rear end of the liner 4 of the second tube body 2 are respectively abutted against the two ends of the second sealing ring 10 to limit the two ends of the liner 4 and seal the connection between the two main bodies 3 and the connection between the two liners 4, which can avoid leakage on the one hand and reduce the corrosion of the main body 3 caused by water vapor entering through the joint between the two liners 4 on the other hand.

[0021] The first tube body 1 and the second tube body 2 are provided with a first corrosion-resistant layer 11 and a second corrosion-resistant layer 12 on the inner and outer sides thereof, respectively.

[0022] In the above structure, a liner 4 is externally arranged on the main body 3 of the first tube body 1 and the second tube body 2, which can improve the strength and corrosion resistance of the main body 3; the liner 4 and the main body 3 can be transported separately, and the liner 4 is a replaceable structure. When the liner 4 is damaged due to corrosion or impact, it can be replaced, so that the main body 3 can be reused, thereby improving the service life of the main body 3; the installation method of the liner 4 is simple and reliable, and the front and rear ends of the liner 4 are limited after the two main bodies 3 are connected; and the setting of the first sealing ring 9 and the second sealing ring 10 ensures the sealing of the joint between the liner 4 and the main body 3, provides protection for the second corrosion-resistant layer 12 on the outside of the main body 3, reduces the entry of water vapor, and thereby improves the service life of the second corrosion-resistant layer 12.

[0023] Preferably, Figure 1 As shown, the outer diameter of the connecting end 5 is smaller than the inner diameter of the main body 3 .

[0024] In another embodiment, the liner 4 is an integrally molded structure of engineering plastics.

[0025] In another embodiment, the convex ring 6 and the limiting platform 7 are an integrally formed structure of stainless steel.

[0026] In another embodiment, the convex ring 6 is welded to the front end of the main body 3 .

[0027] Specifically, the first corrosion-resistant layer 11 is an epoxy resin layer.

[0028] Specifically, the second corrosion-resistant layer 12 is a polyolefin coating.

[0029] In another embodiment, the outer wall of the liner 4 is densely covered with raised hemispherical particles to improve the anti-collision capability of the liner 4 .

Claims

1. A high-strength, corrosion-resistant composite stainless steel seamless pipe, comprising a first pipe body (1) and a second pipe body (2), characterized in that: The first tube body (1) and the second tube body (2) both comprise a main body (3) and a liner (4) arranged on the outer periphery of the main body (3); the front end of the main body (3) comprises a connecting end (5), the connecting end (5) comprises an external thread, the rear end of the main body (3) comprises an internal thread corresponding to the connecting end (5), the front end outer periphery of the main body (3) further comprises a circle of convex rings (6), the outer periphery of the convex rings (6) comprises a plurality of limiting platforms (7), the front end of the liner (4) comprises limiting grooves (8) corresponding to the convex rings (6) and the limiting platforms (7), and the liner (4) is sleeved on the main body (3), the convex ring (6) and the limiting platform (7) match the limiting groove (8), a first sealing ring (9) is also provided at the connection between the convex ring (6) and the limiting groove (8), the connecting end (5) of the first tube body (1) is screwed to the rear end of the second tube body (2), a second sealing ring (10) is also provided at the connection between the first tube body (1) and the main body (3) of the second tube body (2), the front end of the liner (4) of the first tube body (1) and the rear end of the liner (4) of the second tube body (2) are respectively abutted against the two ends of the second sealing ring (10); The first tube body (1) and the second tube body (2) are also provided with a first corrosion-resistant layer (11) and a second corrosion-resistant layer (12) on the inner and outer sides thereof, respectively.

2. The high-strength, corrosion-resistant composite stainless steel seamless pipe according to claim 1, characterized in that: The outer diameter of the connecting end (5) is smaller than the inner diameter of the main body (3).

3. The high-strength, corrosion-resistant composite stainless steel seamless pipe according to claim 2, characterized in that: The liner (4) is an engineering plastic one-piece molded structure.

4. The high-strength, corrosion-resistant composite stainless steel seamless pipe according to claim 3, characterized in that: The convex ring (6) and the limiting platform (7) are stainless steel integrally formed structures.

5. The high-strength, corrosion-resistant composite stainless steel seamless pipe according to claim 4, characterized in that: The convex ring (6) is welded to the front end of the main body (3).

6. The high-strength, corrosion-resistant composite stainless steel seamless pipe according to claim 5, characterized in that: The first corrosion-resistant layer (11) is an epoxy resin layer.

7. The high-strength, corrosion-resistant composite stainless steel seamless pipe according to claim 6, characterized in that: The second corrosion-resistant layer (12) is a polyolefin coating.

8. The high-strength, corrosion-resistant composite stainless steel seamless pipe according to claim 7, characterized in that: The outer wall of the liner (4) is densely covered with raised hemispherical particles.

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