Corrosion-resistant sealing connection joint for rigid pipeline

Abstract

The invention discloses a corrosion-resistant sealing connection joint for a rigid pipeline, and belongs to the technical field of pipeline joints. The joint comprises a first stainless steel joint body and a second stainless steel joint body, through holes are formed in the first stainless steel joint body and the second stainless steel joint body in the axial direction, and a first sealing structure or a second sealing structure is arranged at one end of the first stainless steel joint body. A second sealing structure or a first sealing structure is arranged at one end of the second stainless steel connector, the second stainless steel connector is detachably connected with the first stainless steel connector through a connecting piece, and the second sealing structure is in line contact with the first sealing structure to form sealing. Under the high-pressure working condition, although the abutting force of the second sealing structure abutting against the first sealing structure to form linear contact sealing is large, the first stainless steel connector and the second stainless steel connector cannot damage the corrosion resistance of corrosive media, and therefore the corrosion resistance of the connecting connector is remarkably improved.

Description

Technical Field

[0001] The invention relates to a corrosion-resistant sealing connection joint for a rigid pipeline, belonging to the technical field of pipeline joints. Background Art

[0002] For rigid pipes used for gas or liquid, especially for the transmission of corrosive liquids, the connection between pipes needs to focus on the sealing of the joints.

[0003] A Chinese patent document with publication number CN205226711U discloses a corrosion-resistant high-pressure quick connector. The internal flow-through surface of the quick connector is sprayed with a smooth corrosion-resistant coating XYLAN1052, which has good corrosion resistance and can well protect the parts from any kind of chemical corrosion. When connecting peripheral pipe fittings, only four buckles need to be screwed on the outer thread of the flange body to firmly lock and connect quickly. The unique lip seal ring design achieves low-pressure zero leakage. The metal seal is used for reliable sealing under high-pressure conditions. The configuration of the relief valve ensures the safety of on-site operators.

[0004] However, under high pressure conditions, the cap needs to be tightened with force to make the spherical surface of the plug end press against the conical surface of the inner wall of the flange body. Due to the large pressing force, the corrosion-resistant coating XYLAN1052 on the spherical and conical surfaces is easily damaged, resulting in a significant decrease in the corrosion resistance of the quick connector. Therefore, it is necessary to further improve the corrosion resistance of the quick connector. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a corrosion-resistant sealing connection joint for rigid pipelines.

[0006] The present invention is achieved through the following technical solutions:

[0007] A corrosion-resistant sealed connection joint for a rigid pipeline comprises a first stainless steel joint and a second stainless steel joint, wherein the first stainless steel joint and the second stainless steel joint are both provided with through holes along the axial direction, one end of the first stainless steel joint is provided with a first sealing structure or a second sealing structure, one end of the second stainless steel joint is provided with a second sealing structure or the first sealing structure, the second stainless steel joint is detachably connected to the first stainless steel joint via a connecting piece, and the second sealing structure is in line contact with the first sealing structure to form a seal.

[0008] The first sealing structure is a conical surface at one end of a through hole formed on the first stainless steel joint or the second stainless steel joint.

[0009] The material of the first stainless steel joint or the second stainless steel joint provided with the first sealing structure is 2Cr13, and the first stainless steel joint or the second stainless steel joint is subjected to a tempering heat treatment.

[0010] The second sealing structure is a spherical surface arranged at one end of the first stainless steel joint or the second sealing structure.

[0011] The material of the first stainless steel joint or the second stainless steel joint provided with the second sealing structure is 1Cr18Ni9Ti, and the first stainless steel joint or the second stainless steel joint is quenched into austenite.

[0012] The connecting piece is arranged on the first stainless steel joint or the second stainless steel joint provided with the second sealing structure.

[0013] The connecting piece is a threaded sleeve.

[0014] The threaded sleeve is movably sleeved on a first stainless steel joint or a second stainless steel joint provided with a second sealing structure.

[0015] The threaded sleeve is threadedly connected to a first stainless steel joint or a second stainless steel joint provided with a first sealing structure.

[0016] The beneficial effects of the present invention are as follows: the materials of the first stainless steel joint and the second stainless steel joint are both stainless steel, and the purpose of improving the corrosion resistance of the first stainless steel joint and the second stainless steel joint is achieved by using the stainless steel material; under high-pressure working conditions, after the second stainless steel joint is detachably connected to the first stainless steel joint through a connecting piece, although the pressing force of the second sealing structure against the first sealing structure to form a line contact seal is relatively large, this will not cause damage to the corrosion resistance of the first stainless steel joint and the second stainless steel joint to corrosive media, thereby significantly improving the corrosion resistance of the connecting joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] In the figure: 1-first stainless steel joint, 2-connecting piece, 3-second stainless steel joint, 4-first sealing structure, 5-second sealing structure. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0020] like Figure 1As shown, a corrosion-resistant sealed connection joint for a rigid pipeline according to the present invention comprises a first stainless steel joint 1 and a second stainless steel joint 3, both of which are provided with through holes in the axial direction, one end of the first stainless steel joint 1 is provided with a first sealing structure 4 or a second sealing structure 5, one end of the second stainless steel joint 3 is provided with a second sealing structure 5 or a first sealing structure 4, the second stainless steel joint 3 is detachably connected to the first stainless steel joint 1 through a connector 2, and the second sealing structure 5 is in line contact with the first sealing structure 4 to form a seal. When in use, the first stainless steel joint 1 and the second stainless steel joint 3 are both made of stainless steel, and the stainless steel material is used to improve the corrosion resistance of the first stainless steel joint 1 and the second stainless steel joint 3; under high pressure conditions, after the second stainless steel joint 3 is detachably connected to the first stainless steel joint 1 through the connector 2, although the second sealing structure 5 is pressed against the first sealing structure 4 to form a line contact seal with a relatively large pressing force, this will not damage the corrosion resistance of the first stainless steel joint 1 and the second stainless steel joint 3 to the corrosive medium, thereby significantly improving the corrosion resistance of the connection joint.

[0021] The first sealing structure 4 is a conical surface formed at one end of a through hole formed on the first stainless steel joint 1 or the second stainless steel joint 3 .

[0022] The material of the first stainless steel joint 1 or the second stainless steel joint 3 provided with the first sealing structure 4 is 2Cr13, and the first stainless steel joint 1 or the second stainless steel joint 3 is subjected to quenching and tempering heat treatment. The purpose of quenching and tempering 2Cr13 is to make the first stainless steel joint 1 or the second stainless steel joint 3 provided with the first sealing structure 4 have good comprehensive mechanical properties. Quenching and tempering refers to a double heat treatment method of quenching and high-temperature tempering, which can adjust the performance of the first stainless steel joint 1 or the second stainless steel joint 3 to a great extent, and its strength, plasticity and toughness are good, and it has good comprehensive mechanical properties.

[0023] The second sealing structure 5 is a spherical surface provided at one end of the first stainless steel joint 1 or the second sealing structure 5 .

[0024] The material of the first stainless steel joint 1 or the second stainless steel joint 3 provided with the second sealing structure 5 is 1Cr18Ni9Ti, and the first stainless steel joint 1 or the second stainless steel joint 3 is quenched into austenite. The purpose of quenching 1Cr18Ni9Ti into austenite is to obtain a single austenite structure, improve its corrosion resistance, and prevent intergranular corrosion.

[0025] The connecting piece 2 is arranged on the first stainless steel joint 1 or the second stainless steel joint 3 provided with the second sealing structure 5 .

[0026] The connecting piece 2 is a threaded sleeve.

[0027] The threaded sleeve is movably mounted on the first stainless steel joint 1 or the second stainless steel joint 3 provided with the second sealing structure 5 .

[0028] The screw sleeve is threadedly connected to the first stainless steel joint 1 or the second stainless steel joint 3 provided with the first sealing structure 4. When in use, the first stainless steel joint 1 or the second stainless steel joint 3 is provided with an external thread on the outer circumferential surface of one end provided with the first sealing structure 4, and the external thread is used for threading connection with the screw sleeve.

Claims

1. A corrosion-resistant sealing connection joint for a rigid pipeline, characterized in that: The invention comprises a first stainless steel joint (1) and a second stainless steel joint (3), wherein the first stainless steel joint (1) and the second stainless steel joint (3) are both provided with through holes in the axial direction, one end of the first stainless steel joint (1) is provided with a first sealing structure (4) or a second sealing structure (5), and one end of the second stainless steel joint (3) is provided with a second sealing structure (5) or a first sealing structure (4), the second stainless steel joint (3) is detachably connected to the first stainless steel joint (1) via a connecting piece (2), and the second sealing structure (5) is in line contact with the first sealing structure (4) to form a seal.

2. The corrosion-resistant sealing connection joint for rigid pipes according to claim 1, characterized in that: The first sealing structure (4) is a conical surface at one end of a through hole formed on the first stainless steel joint (1) or the second stainless steel joint (3).

3. The corrosion-resistant sealing connection joint for rigid pipes according to claim 1, characterized in that: The material of the first stainless steel joint (1) or the second stainless steel joint (3) provided with the first sealing structure (4) is 2Cr13, and the first stainless steel joint (1) or the second stainless steel joint (3) is subjected to a tempering heat treatment.

4. The corrosion-resistant sealing connection joint for rigid pipes according to claim 1, characterized in that: The second sealing structure (5) is a spherical surface provided at one end of the first stainless steel joint (1) or the second sealing structure (5).

5. The corrosion-resistant sealing connection joint for rigid pipes according to claim 1, characterized in that: The material of the first stainless steel joint (1) or the second stainless steel joint (3) provided with the second sealing structure (5) is 1Cr18Ni9Ti, and the first stainless steel joint (1) or the second stainless steel joint (3) is quenched into austenite.

6. The corrosion-resistant sealing connection joint for rigid pipes according to claim 1, characterized in that: The connecting piece (2) is arranged on a first stainless steel joint (1) or a second stainless steel joint (3) provided with a second sealing structure (5).

7. The corrosion-resistant sealing connection joint for rigid pipes according to claim 1, characterized in that: The connecting piece (2) is a threaded sleeve.

8. The corrosion-resistant sealing connection joint for rigid pipes according to claim 7, characterized in that: The threaded sleeve is movably mounted on a first stainless steel joint (1) or a second stainless steel joint (3) provided with a second sealing structure (5).

9. The corrosion-resistant sealing connection joint for rigid pipes according to claim 7, characterized in that: The threaded sleeve is threadedly connected to a first stainless steel joint (1) or a second stainless steel joint (3) provided with a first sealing structure (4).

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