High-strength corrosion-resistant stainless steel pipe fitting

Abstract

The utility model relates to a high-strength corrosion-resistant stainless steel pipe fitting, which comprises an outer pipe fitting, an inner cage body and an inner pipe fitting, the inner cage body can be divided into a left part and a right part which are respectively inserted into an inner cavity of the outer pipe fitting from the two ends of the outer pipe fitting, and the left part and the right part of the inner cage body are fixedly connected with the outer pipe fitting in a clamping manner; the inner pipe fitting is arranged on the inner side of the inner cage body, and the two ends of the inner pipe fitting are fixedly connected with the left part and the right part of the inner cage body in an inserted mode respectively. The inner cage body and the inner pipe fitting are arranged in a matched mode, so that the high-strength corrosion-resistant stainless steel pipe fitting is convenient to machine and assemble, and the machining and production efficiency of the pipe fitting can be improved; the inner cage body and the outer pipe fitting are arranged in a matched mode, so that the inner cage body can enhance the overall mechanical strength of the pipe fitting, and deformation caused by external stress of the outer pipe fitting is reduced; and through the arrangement of the inner pipe fitting, the inner pipe fitting can be used for anti-corrosion protection when media are conveyed in the outer pipe fitting and the inner pipe fitting, and the overall service life of the pipe fitting is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of stainless steel pipe fittings, in particular to a high-strength corrosion-resistant stainless steel pipe fitting. Background Art

[0002] Duplex stainless steel, also known as austenitic-ferritic stainless steel, has the dual characteristics of austenitic stainless steel and ferritic stainless steel. Compared with ordinary Cr-Ni stainless steel, duplex stainless steel has better corrosion resistance. Duplex stainless steel pipe fittings made of duplex stainless steel are widely used in petrochemical equipment, seawater and wastewater treatment equipment, oil and gas pipelines, papermaking machinery and other industrial fields. Relying solely on the corrosion resistance of duplex stainless steel pipe fittings themselves can no longer meet the various complex application environments of pipe fittings.

[0003] For example, in a utility model patent with Chinese patent publication number CN209115888U, a duplex stainless steel pipe fitting is proposed, including a pipe body, which is a hollow component. A corrosion-resistant anti-corrosion ring is detachably inserted in the pipe body, the inner wall of the pipe body is provided with an internal thread along the circumferential direction, the outer wall of the anti-corrosion ring is provided with an external thread along the circumferential direction, the anti-corrosion ring and the pipe body form a threaded match, and the corrosion resistance of the pipe fitting is further improved by the anti-corrosion ring.

[0004] However, during the production and processing of such duplex stainless steel pipe fittings, additional internal threads need to be turned on the inner wall of the steel pipe, which increases the processing difficulty and thus reduces the processing and production efficiency of the pipe fittings. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] The utility model provides a high-strength corrosion-resistant stainless steel pipe fitting, which solves the problem that duplex stainless steel pipe fittings need to be additionally turned on the inner wall of the steel pipe to form internal threads during production and processing, which increases the processing difficulty and thus reduces the processing production efficiency of the pipe fittings.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-strength, corrosion-resistant stainless steel pipe fitting, comprising an outer pipe fitting, an inner cage body and an inner pipe fitting, wherein the inner cage body can be split into left and right parts, which are respectively inserted into the inner cavity of the outer pipe fitting from both ends of the outer pipe fitting, and the left and right parts of the inner cage body are both fixedly connected with the outer pipe fitting, the inner pipe fitting is arranged on the inner side of the inner cage body, and the two ends of the inner pipe fitting are respectively plugged and fixed with the left and right parts of the inner cage body, and the inner pipe fitting and the outer pipe fitting are coaxially distributed.

[0009] Preferably, the left and right parts of the inner cage body each include an end face ring, a positioning ring and a plurality of arc strips, the positioning ring and the end face ring are coaxially fixed on the side of the end face ring facing the inner cavity of the outer pipe fitting, and the plurality of arc strips are fixedly connected to the side of the positioning ring facing away from the end face ring at equal intervals along the radial direction of the positioning ring, and the gap between every two adjacent arc strips forms a slot that matches the inner pipe fitting.

[0010] In a further embodiment, the outer diameter of the positioning ring is matched with the inner diameter of the outer pipe, and the outer diameter of the end face ring is matched with the outer diameter of the outer pipe.

[0011] In a further embodiment, the cross section of the arc strip is configured to be arc-shaped, and the inner diameter of the arc strip is equal to the inner diameter of the positioning ring, and the outer diameter of the arc strip is equal to the outer diameter of the positioning ring.

[0012] It is further preferred that the inner pipe fitting includes multiple anti-corrosion plates and multiple positioning plates, the back side of each anti-corrosion plate is fixedly connected to a positioning plate, the positioning plates are inserted into the slots and fixedly connected to the inner cage body, the cross-section of the positioning plates is arranged to be arc-shaped, and the outer diameter of the positioning plate is smaller than the outer diameter of the positioning ring, and the inner diameter of the positioning plate is equal to the inner diameter of the positioning ring.

[0013] (III) Beneficial effects

[0014] Compared with the prior art, the utility model provides a high-strength corrosion-resistant stainless steel pipe fitting, which has the following beneficial effects:

[0015] In the utility model, the inner cage body and the inner pipe fitting are matched to facilitate the processing and assembly of the high-strength corrosion-resistant stainless steel pipe fitting, and the processing and production efficiency of the pipe fitting can be improved; the inner cage body and the outer pipe fitting are matched to enhance the overall mechanical strength of the pipe fitting and reduce the deformation of the outer pipe fitting caused by external force; the inner pipe fitting is set to perform corrosion protection when the medium is transported in the outer pipe fitting, thereby improving the overall service life of the pipe fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional structural diagram of a high-strength, corrosion-resistant stainless steel pipe fitting according to an embodiment;

[0017] Figure 2 for Figure 1 Schematic diagram of the overall structure of medium and high strength corrosion-resistant stainless steel pipe fittings;

[0018] Figure 3 is a schematic diagram of the matching structure of the inner cage body and the inner pipe according to the implementation scheme;

[0019] Figure 4 for Figure 3Schematic diagram of the structure of the inner cage;

[0020] Figure 5 for Figure 3 Schematic diagram of the structure of the inner pipe fittings.

[0021] In the figure: 10, outer pipe fitting; 20, inner cage body; 21, end face ring; 22, positioning ring; 23, arc plate; 24, slot; 30, inner pipe fitting; 31, anti-corrosion plate; 32, positioning plate. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figures 1 to 3 , a high-strength, corrosion-resistant stainless steel pipe fitting, an outer pipe fitting 10, an inner cage body 20 and an inner pipe fitting 30. The outer pipe fitting 10 can be made of a conventional stainless steel pipe. The inner cage body 20 can be split into symmetrical left and right parts, and the left and right parts of the inner cage body 20 can be inserted into the inner cavity of the outer pipe fitting 10 from both ends of the outer pipe fitting 10, respectively. By using the interference fit between the left and right parts of the inner cage body 20 and the outer pipe fitting, the left and right parts of the inner cage body 20 can be clamped and connected with the outer pipe fitting 10. The inner pipe fitting 30 is arranged on the inner side of the inner cage body 20, and the two ends of the inner pipe fitting 30 are respectively plugged and fixed with the left and right parts of the inner cage body 20 by interference fit. After the pipe fittings are assembled, the inner pipe fitting 30 is coaxially distributed with the outer pipe fitting 10, and the inner cavity of the inner pipe fitting 30 is used to make the conveying medium flow.

[0024] See also Figure 4The split left and right parts of the inner cage body 20 can both include an end face ring 21, a positioning ring 22, and a plurality of arc strips 23. The positioning ring 22 is coaxially fixed with the end face ring 21 on the side of the end face ring 21 facing the inner cavity of the outer pipe 10, and the outer diameter of the positioning ring 22 is adapted to the inner diameter of the outer pipe 10, so that the interference fit between the two can be used to clamp and complete the connection during installation; the outer diameter of the end face ring 21 is adapted to the outer diameter of the outer pipe 10, so that the positioning ring 22 can be used to limit the insertion position of the positioning ring 22 when the split left and right parts of the inner cage body 20 are installed. The multiple arc strips 23 are fixedly connected to the side of the positioning ring 22 facing away from the end face ring 21 at equal intervals along the radial direction of the positioning ring 22, and the cross section of the arc strips 23 is set to be arc-shaped, the inner diameter of the arc strips 23 is equal to the inner diameter of the positioning ring 22, and the outer diameter of the arc strips 23 is equal to the outer diameter of the positioning ring 22, so that the outer wall of the arc strips 23 can fit the inner wall of the outer pipe 10 to provide reinforcement support for the outer pipe 10; and an insertion space equal to the inner diameter of the positioning ring 22 is formed on the inner side of the multiple arc strips 23. The gap between each two adjacent arc strips 23 forms a slot 24 that matches the inner pipe 30, so that it can match the installation and fixation of the inner pipe 30.

[0025] See also Figure 5 The inner pipe 30 includes a plurality of anti-corrosion plates 31 and a plurality of positioning plates 32. The back of each anti-corrosion plate 31 is fixedly connected to a positioning plate 32. The plurality of anti-corrosion plates 31 can be assembled into a tube. In this embodiment, the anti-corrosion plates 31 connected with the positioning plates 32 can be formed by pre-casting and curing cement mortar; or the anti-corrosion plates 31 connected with the positioning plates 32 can also be made of polytetrafluoroethylene plastic injection molding.

[0026] When assembling the pipe fittings, the left or right part of the inner cage body 20 can be placed on the press first, and the end face ring 21 can be facing downward. Then, multiple anti-corrosion plates 31 can be placed at the slot 24 and pressed down by the press, so that the positioning plate 32 is inserted into the slot 24 and clamped and fixed between a part of the inner cage body 20. The cross section of the positioning plate 32 is set to be arc-shaped, and the outer diameter of the positioning plate 32 is smaller than the outer diameter of the positioning ring 22, and the inner diameter of the positioning plate 32 is equal to the inner diameter of the positioning ring 22. The positioning plate 32 is prevented from fitting with the inner wall of the outer pipe fitting 10, thereby reducing the conduction of the outer pipe fitting 10 to the inner pipe fitting 30 when it is subjected to vibration. After completing the above assembly, the outer pipe fitting 10 can be sleeved outside the inner pipe fitting 30 from top to bottom, and the press can be used to press down again to connect and fix the outer pipe fitting 10 with a part of the inner cage body 20. Finally, the other part of the inner cage body 20 can be pressed from the upper end of the outer pipe fitting 10 by the press to complete the assembly of the pipe fittings.

[0027] In all the schemes mentioned above, the connection between two parts can be selected according to actual conditions by welding, bolt and nut matching connection, bolt or screw connection or other well-known connection methods, which are not described one by one here. In the above, all fixed connections are preferably welded. Although the embodiments of the utility model have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the utility model. The scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A high-strength, corrosion-resistant stainless steel pipe fitting, comprising an outer pipe fitting (10), characterized in that: The invention also comprises an inner cage body (20) and an inner pipe fitting (30). The inner cage body (20) can be split into a left part and a right part, which are respectively inserted into the inner cavity of the outer pipe fitting (10) from the two ends of the outer pipe fitting (10), and the left and right parts of the inner cage body (20) are both fixedly connected to the outer pipe fitting (10). The inner pipe fitting (30) is arranged on the inner side of the inner cage body (20), and the two ends of the inner pipe fitting (30) are respectively plugged and fixed to the left and right parts of the inner cage body (20), and the inner pipe fitting (30) and the outer pipe fitting (10) are coaxially distributed.

2. The high-strength, corrosion-resistant stainless steel pipe fitting according to claim 1, characterized in that: The split left and right parts of the inner cage body (20) both include an end face ring (21), a positioning ring (22) and a plurality of arc strips (23); the positioning ring (22) and the end face ring (21) are coaxially fixed on the side of the end face ring (21) facing the inner cavity of the outer pipe (10); the plurality of arc strips (23) are fixedly connected to the side of the positioning ring (22) facing away from the end face ring (21) at equal intervals along the radial direction of the positioning ring (22); the gap between each two adjacent arc strips (23) forms a slot (24) that matches the inner pipe (30).

3. The high-strength, corrosion-resistant stainless steel pipe fitting according to claim 2, characterized in that: The outer diameter of the positioning ring (22) is matched with the inner diameter of the outer pipe (10), and the outer diameter of the end face ring (21) is matched with the outer diameter of the outer pipe (10).

4. The high-strength, corrosion-resistant stainless steel pipe fitting according to claim 3, characterized in that: The cross section of the arc strip (23) is arranged to be arc-shaped, and the inner diameter of the arc strip (23) is equal to the inner diameter of the positioning ring (22), and the outer diameter of the arc strip (23) is equal to the outer diameter of the positioning ring (22).

5. The high-strength, corrosion-resistant stainless steel pipe fitting according to claim 4, characterized in that: The inner pipe (30) comprises a plurality of anti-corrosion plates (31) and a plurality of positioning plates (32), the back side of each anti-corrosion plate (31) being fixedly connected to a positioning plate (32), and the positioning plate (32) being inserted into the slot (24) and fixedly connected to the inner cage body (20).

6. The high-strength, corrosion-resistant stainless steel pipe fitting according to claim 5, characterized in that: The cross section of the positioning plate (32) is arranged to be arc-shaped, and the outer diameter of the positioning plate (32) is smaller than the outer diameter of the positioning ring (22), and the inner diameter of the positioning plate (32) is equal to the inner diameter of the positioning ring (22).

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