Anti-corrosion conveying connecting pipe

Abstract

The utility model relates to the field of connecting pipes, and particularly discloses an anti-corrosion conveying connecting pipe which comprises a pipe body, one end of the pipe body is rotationally connected with a connecting sleeve, external threads are arranged on the inner side face of the connecting sleeve, a sealing ring located in the connecting sleeve is fixed in the end face of one side of the pipe body, and a cylindrical sealing cylinder is fixed on the inner side face of the sealing ring. One end of the sealing cylinder extends into the pipe body and is fixed to the inner side wall of the pipe body, and the other end of the sealing cylinder expands along with extrusion of the sealing ring. When the pipe body is connected with a pipeline through the connecting sleeve, the pipeline tightly abuts against the sealing ring, so that the leakproofness between the pipe body and the pipeline is ensured, meanwhile, the end, away from the pipe body, of the sealing barrel extends into the pipeline, the sealing ring is extruded by the pipeline, the end, located in the pipeline, of the sealing barrel expands, and then the periphery of the sealing barrel abuts against the inner wall of the pipeline; therefore, contact between the joint of the pipe body and the pipeline and corrosive fluid is reduced, and the corrosion resistance of the joint of the pipe body and the pipeline is improved.

Description

Technical Field

[0001] This utility model relates to the field of connecting pipes, specifically a corrosion-resistant conveying connecting pipe. Background Technology

[0002] The conveying connection pipe is mainly used to transport fluids after connecting with the pipeline. Generally, an anti-corrosion coating is applied to the inner wall of the pipeline and the inside of the conveying connection pipe. However, the ends of the pipeline lack the protection of an anti-corrosion coating. When the fluid transported in the pipeline is corrosive, the fluid will corrode the connection between the conveying connection pipe and the pipeline over a long period of time, resulting in a decrease in the sealing between the pipeline and the conveying connection pipe. This makes it easy for leakage to occur between the pipeline and the conveying connection pipe. Since the connection between the pipeline and the conveying connection pipe comes into contact with more corrosive fluid, the connection between the two is more likely to be further corroded. Utility Model Content

[0003] The purpose of this utility model is to provide a corrosion-resistant conveying connection pipe to overcome the above-mentioned defects in the prior art.

[0004] According to the present invention, a corrosion-resistant conveying connecting pipe includes a pipe body, a connecting sleeve rotatably connected to one end of the pipe body, an external thread on the inner side of the connecting sleeve, a sealing ring fixed inside the connecting sleeve on one end face of the pipe body, a cylindrical sealing cylinder fixed inside the sealing ring, one end of the sealing cylinder extending into the pipe body and fixed to the inner side wall of the pipe body, and the other end of the sealing cylinder expanding as the sealing ring is compressed.

[0005] With the above technical solution, when the pipe body is connected to the pipeline through the connecting sleeve, the pipeline and the sealing ring are tightly abutted, thereby ensuring the airtightness between the pipe body and the pipeline. At the same time, the end of the sealing cylinder away from the pipe body extends into the pipeline. The sealing ring is squeezed by the pipeline, causing the end of the sealing cylinder located in the pipeline to expand, thereby causing the outer circumference of the sealing cylinder to abut against the inner wall of the pipeline. This reduces the contact between the connection between the pipe body and the pipeline and corrosive fluid, thereby increasing the corrosion resistance of the connection between the pipe body and the pipeline.

[0006] Preferably, a fixing groove is formed in the inner end face of the tube body near the sealing ring, with the tube body axis as the center. A fixing part is fixed in the inner end face of the sealing ring near the tube body, and the fixing part is embedded in the fixing groove and fixedly connected to the fixing groove.

[0007] The above technical solutions increase the connection stability between the sealing ring and the pipe body, thereby improving the sealing effect of the sealing ring.

[0008] Preferably, the sealing ring has a cavity, and the end of the sealing cylinder extending out of the tube has an expansion cavity, which is connected to the cavity.

[0009] With the above technical solution, when the sealing ring is compressed, the air in the cavity is transported into the expansion cavity, which causes the end of the sealing cylinder that extends out of the pipe to expand and come into contact with the inner wall of the pipe.

[0010] Preferably, the sealing ring, the fixing part, and the sealing cylinder are integrally molded from fluororubber.

[0011] Through the above technical solutions, the sealing rings, fixing parts, and sealing cylinders made of fluororubber have excellent corrosion resistance.

[0012] Preferably, a cylindrical support cylinder is fixed to the inner side of the sealing cylinder.

[0013] Through the above technical solution, the cylindrical support cylinder can reduce the inward deformation of the sealing cylinder when it expands.

[0014] Preferably, the support cylinder is made of tungsten-molybdenum alloy.

[0015] Through the above technical solution, the support cylinder made of tungsten-molybdenum alloy has excellent corrosion resistance and high strength, so that when the sealing cylinder expands, it can only deform outward in its radial direction, thereby ensuring the pressure when the sealing cylinder expands and comes into contact with the inner wall of the pipe.

[0016] Preferably, a connecting ring is fixed on the outer periphery of the tube body, encircling the tube body. A first connecting groove is formed in the connecting ring. Two annular protrusions are formed on the inner sidewall of the connecting sleeve. A second connecting groove is formed between the two annular protrusions. The second connecting groove is embedded in the first connecting groove, and the connecting ring is embedded in the annular protrusion.

[0017] The above technical solution increases the connection strength between the connecting sleeve and the pipe body, thereby ensuring the connection strength between the two when connecting the pipe body and the pipeline.

[0018] The beneficial effects of this utility model are as follows: when the pipe body is connected to the pipeline through the connecting sleeve, the pipeline and the sealing ring are tightly abutted, thereby ensuring the airtightness between the pipe body and the pipeline. At the same time, the end of the sealing cylinder away from the pipe body extends into the pipeline. The sealing ring is squeezed by the pipeline, causing the end of the sealing cylinder located in the pipeline to expand, thereby causing the outer circumference of the sealing cylinder to abut against the inner wall of the pipeline, thereby reducing the contact between the connection between the pipe body and the pipeline and the corrosive fluid, and thus increasing the corrosion resistance of the connection between the pipe body and the pipeline. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0021] Figure 3 This is a utility model Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 This is an exploded view of this utility model;

[0023] Figure 5 This is a cross-sectional schematic diagram of the tube body in this utility model;

[0024] Figure 6 This is a cross-sectional schematic diagram of the connecting sleeve in this utility model;

[0025] Figure 7 This is a cross-sectional schematic diagram of the sealing ring and sealing cylinder in this utility model.

[0026] In the picture:

[0027] 10. Pipe body; 101. Connecting ring; 102. First connecting groove; 11. Fixing groove; 20. Connecting sleeve; 201. Annular protrusion; 202. Second connecting groove; 40. Sealing ring; 41. Cavity; 43. Expansion cavity; 44. Fixing part; 45. Sealing cylinder; 46. Support cylinder Detailed Implementation

[0028] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are merely simplified descriptions for the convenience of describing this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific implementations of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model. As used herein, the terms up / down and left / right are not limited to their strict geometric definitions, but rather include tolerances for reasonable and inconsistent machining or human errors. The specific features of this corrosion-resistant conveying connecting pipe are described in detail below:

[0030] One embodiment of this utility model:

[0031] Reference Figures 1-7This utility model provides a corrosion-resistant conveying connecting pipe, including a pipe body 10. The inner wall of the pipe body 10 is coated with a corrosion-resistant coating. A connecting sleeve 20 is rotatably connected to one end of the pipe body 10. The inner side of the connecting sleeve 20 has an external thread. A sealing ring 40 is fixed inside the connecting sleeve 20 on one end face of the pipe body 10. A cylindrical sealing cylinder 45 is fixed inside the sealing ring 40. One end of the sealing cylinder 45 extends into the pipe body 10 and is fixed to the inner side wall of the pipe body 10. The other end of the sealing cylinder 45 expands when the sealing ring 40 is compressed. A fixing groove 11 is formed in the pipe body 10 near the sealing ring 40, with the axis of the pipe body 10 as the center. A fixing part 44 is fixed in the sealing ring 40 near the pipe body 10, and the fixing part 44 is embedded in the fixing groove 11. It is fixedly connected to the fixing groove 11. A cavity 41 is opened in the sealing ring 40. An expansion cavity 43 is opened in the end of the sealing cylinder 45 that extends out of the tube body 10. The expansion cavity 43 is connected to the cavity 41. The sealing ring 40, the fixing part 44 and the sealing cylinder 45 are integrally formed of fluororubber. A cylindrical support cylinder 46 is fixed on the inner side of the sealing cylinder 45. The support cylinder 46 is made of tungsten-molybdenum alloy. A connecting ring 101 is fixed on the outer periphery of the tube body 10 and surrounds the tube body 10. A first connecting groove 102 is opened in the connecting ring 101. Two annular protrusions 201 are opened on the inner side wall of the connecting sleeve 20. A second connecting groove 202 is formed between the two annular protrusions 201. The second connecting groove 202 is embedded in the first connecting groove 102. The connecting ring 101 is embedded in the annular protrusion 201.

[0032] When connecting to the pipeline, the connecting sleeve 20 is put on the pipeline. The inner wall of the pipeline is coated with an anti-corrosion coating. The connecting sleeve 20 is rotated and connected to the pipeline by threads. During this process, the end of the sealing cylinder 45 away from the pipe body 10 is inserted into the pipeline. When the end of the pipeline squeezes the sealing ring 40, the sealing ring 40 deforms. The air in the cavity 41 is squeezed into the expansion cavity 43, so that the section of the sealing cylinder 45 located in the pipeline expands to the side away from the support cylinder 46 and tightly abuts against the inner wall of the pipeline, thereby increasing the sealing performance between the sealing cylinder 45 and the inner wall of the pipeline and reducing the corrosion of the connection between the pipeline and the pipe body 10 by corrosive fluid.

[0033] Those skilled in the art will appreciate that various modifications to the above embodiments can be made without departing from the overall spirit and concept of this utility model. All such modifications fall within the protection scope of this utility model. The protection scheme of this utility model is defined by the appended claims.

Claims

1. A corrosion-resistant conveying connection pipe, comprising a pipe body (10), characterized in that: One end of the tube body (10) is rotatably connected to a connecting sleeve (20). The inner side of the connecting sleeve (20) is provided with an external thread. A sealing ring (40) located inside the connecting sleeve (20) is fixed on one end face of the tube body (10). A cylindrical sealing cylinder (45) is fixed on the inner side of the sealing ring (40). One end of the sealing cylinder (45) extends into the tube body (10) and is fixed on the inner side wall of the tube body (10). The other end of the sealing cylinder (45) expands as the sealing ring (40) is squeezed.

2. The corrosion-resistant conveying connection pipe according to claim 1, characterized in that: A fixing groove (11) is provided in the inner end face of the tube body (10) near the sealing ring (40) with the axis of the tube body (10) as the center. A fixing part (44) is fixed in the inner end face of the sealing ring (40) near the tube body (10). The fixing part (44) is embedded in the fixing groove (11) and fixedly connected to the fixing groove (11).

3. The corrosion-resistant conveying connection pipe according to claim 2, characterized in that: The sealing ring (40) has a cavity (41) inside, and the sealing cylinder (45) has an expansion cavity (43) inside one end that extends out of the tube body (10). The expansion cavity (43) is connected to the cavity (41).

4. The corrosion-resistant conveying connection pipe according to claim 3, characterized in that: The sealing ring (40), the fixing part (44), and the sealing cylinder (45) are integrally molded from fluororubber.

5. The corrosion-resistant conveying connecting pipe according to claim 4, characterized in that: A cylindrical support tube (46) is fixed to the inner side of the sealing tube (45).

6. The corrosion-resistant conveying connection pipe according to claim 5, characterized in that: The support cylinder (46) is made of tungsten-molybdenum alloy.

7. The corrosion-resistant conveying connection pipe according to claim 1, characterized in that: A connecting ring (101) is fixed on the outer periphery of the tube body (10) and surrounds the tube body (10). A first connecting groove (102) is provided in the connecting ring (101). Two annular protrusions (201) are provided on the inner side wall of the connecting sleeve (20). A second connecting groove (202) is formed between the two annular protrusions (201). The second connecting groove (202) is embedded in the first connecting groove (102). The connecting ring (101) is embedded in the annular protrusion (201).

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