Steel lining polytetrafluoroethylene pipe fitting

Abstract

The utility model relates to the technical field of pipeline fittings, and discloses a steel lining polytetrafluoroethylene pipe fitting which comprises an outer pipe and an inner pipe fixedly arranged in the outer pipe. The connecting assembly comprises a check ring, an anti-disengaging ring and a limiting groove, the anti-disengaging ring and the outer pipe are fixedly installed, the limiting groove is formed in the end of the check ring, the anti-disengaging ring can be clamped into the limiting groove, the check ring can rotate around the anti-disengaging ring, a plurality of holes used for installation are formed in the end of the check ring, and the positions of the installation holes are adjusted through rotation of the check ring. The installation holes of the check ring and the installation holes of the pipeline flanges can be conveniently adjusted to be coaxial, in the installation process, the phenomenon that installation is difficult due to the fact that the installation holes of the two pipeline flanges are not coaxial is avoided, installation convenience and adaptability are greatly improved, and the check ring can be finely adjusted to rotate by a certain angle; and the probability of bolt breakage caused by overlarge bolt shearing force due to expansion deformation when the check ring is connected with the flange is reduced.

Description

Technical Field

[0001] This utility model relates to the field of pipe fittings technology, and in particular to a steel-lined PTFE pipe fitting. Background Technology

[0002] PTFE-lined tubing has excellent temperature and corrosion resistance, making it ideal for conveying highly corrosive media.

[0003] The prior art discloses a tamper-proof steel-lined PTFE pipe fitting (publication number: CN214662812U), including a tee inner tube, a tee outer tube provided on the outside of the tee inner tube, the tee outer tube being composed of a vertical outer tube and a horizontal outer tube, the bottom end of the vertical outer tube being fixed to one side of the horizontal outer tube, the top end of the vertical outer tube being fixed with a first flange, one end of the horizontal outer tube being fixed with a second flange, the other end of the horizontal outer tube being fixed with a third flange, a main controller being installed on one side of the horizontal outer tube, two support rods being fixed on the inner top wall of the tee inner tube, a sealing box being fixed at the bottom end of each of the two support rods, and an electric heating wire being provided between the two sealing boxes.

[0004] In the existing technology, when connecting pipe fittings to pipelines, they are mainly locked by flanges and bolts and nuts. However, the flanges of pipe fittings are mostly fixed by welding. When connecting with the pipeline, the mounting hole at one end can be aligned with the flange of the pipeline. If the mounting holes of the flanges of the two pipelines are misaligned, it is difficult for the flange at the other end of the pipe fitting to be aligned with the flange of the other pipeline, which makes it difficult to install the bolts.

[0005] Therefore, we propose a steel-lined PTFE pipe fitting. Utility Model Content

[0006] The present invention mainly solves the technical problem that the flanges of existing pipe fittings are difficult to align with the flanges of the pipes, and provides a steel-lined PTFE pipe fitting.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a steel-lined PTFE pipe fitting, comprising:

[0008] An outer tube and an inner tube fixedly installed inside the outer tube;

[0009] A connecting component is provided at the port of the outer tube for connection and installation. The connecting component includes a retaining ring, a detachment ring, and a limiting groove. The detachment ring is fixedly installed with the outer tube. The end of the retaining ring has a limiting groove, and the detachment ring can be inserted into the limiting groove. The retaining ring can rotate around the detachment ring. The end of the retaining ring has several holes for installation.

[0010] In a preferred embodiment of this utility model, both the retaining ring and the anti-detachment ring are annular structures, the limiting groove is an annular groove, and the anti-detachment ring and the limiting groove are used in conjunction with each other.

[0011] In a preferred embodiment of this utility model, the inner diameter of the anti-detachment ring is equal to the outer diameter of the outer tube, the end face of the anti-detachment ring is flush with the end face of the outer tube, the retaining ring is disposed on one side of the anti-detachment ring, the depth of the limiting groove is equal to the thickness of the anti-detachment ring, and the depth of the limiting groove is less than the thickness of the retaining ring.

[0012] In a preferred embodiment of this utility model, the hole penetrates the retaining ring, and the end faces of multiple retaining rings are arranged in a ring array.

[0013] In a preferred embodiment of this utility model, the connecting assembly further includes positioning holes and thrust blocks. The ends of the retaining ring and the anti-disengagement ring are provided with several identical positioning holes, and the thrust block can be inserted into the positioning holes to position the retaining ring and the anti-disengagement ring.

[0014] In a preferred embodiment of this utility model, the positioning hole forms a semi-circular groove, and the inner circumferential surface of the retaining ring and the outer circumferential surface of the anti-loosening ring are provided with a plurality of corresponding positioning holes, and the positioning holes at the end of the retaining ring and the positioning holes at the end of the anti-loosening ring can be aligned with each other.

[0015] In a preferred embodiment of this utility model, the thrust block is formed into a circular block, and the thrust block is interference-fitted with the positioning hole, wherein the thickness of the thrust block is equal to the depth of the positioning hole.

[0016] Beneficial effects

[0017] This utility model provides a steel-lined PTFE pipe fitting. It has the following beneficial effects:

[0018] 1. This type of PTFE-lined steel pipe fitting allows for the installation of a retaining ring and an anti-loosening ring at the end of the outer pipe. The anti-loosening ring is then welded and fixed to the outer pipe. When connecting the outer pipe to the pipeline, the retaining ring can be rotated, and the anti-loosening ring guides the retaining ring within the limiting groove, ensuring stable circumferential rotation. The position of the mounting hole can be adjusted by rotating the retaining ring, facilitating the alignment of the retaining ring's mounting hole with the pipe flange's mounting hole. Similarly, when the other end of the outer pipe is connected to another pipeline, the position of the retaining ring and the mounting hole of the other pipeline flange can also be adjusted. During installation, the misalignment of the mounting holes of the two pipe flanges will not cause installation difficulties, greatly improving the convenience and adaptability of installation. The retaining ring, which can rotate along the anti-loosening ring, allows for fine-tuning of the retaining ring's rotation angle when the bolts lock the retaining ring and flange together, reducing the probability of bolt breakage due to excessive shear force caused by expansion deformation when the retaining ring is connected to the flange.

[0019] 2. This type of PTFE-lined steel pipe fitting features a retaining ring that can rotate around the anti-slip ring. In scenarios where locking the retaining ring and anti-slip ring is necessary, the retaining ring can be rotated to align the positioning hole at its end with that at the end of the anti-slip ring, forming a circular hole. A thrust block is then driven into the two positioning holes, locking the retaining ring and preventing it from rotating around the anti-slip ring. The thrust block can be spot-welded or left unwelded. The interference fit between the positioning hole and the thrust block also prevents the thrust block from falling off. Furthermore, when the retaining ring is connected to a flange, the thrust block is pressed into the positioning hole by the flange. This design allows for both locking and unlocking of the retaining ring and anti-slip ring, with flexible and convenient switching between the two methods, facilitating installation and operation. Attached Figure Description

[0020] Figure 1 This is one of the overall perspective views of this utility model;

[0021] Figure 2 This is the second overall perspective view of the present utility model;

[0022] Figure 3 This is a perspective view of the retaining ring of this utility model;

[0023] Figure 4 This is a three-dimensional view of the anti-detachment ring of this utility model;

[0024] Figure 5 This is a perspective view of the thrust block of this utility model.

[0025] Legend: 10. Outer tube; 11. Inner tube; 20. Retaining ring; 21. Anti-disengagement ring; 22. Limiting groove; 23. Positioning hole; 24. Thrust block. Detailed Implementation

[0026] A type of steel-lined PTFE pipe fitting, such as Figure 1 and Figure 2 As shown, it includes:

[0027] The outer tube 10 and the inner tube 11 fixedly installed inside the outer tube 10 are described. Taking the outer tube 10 as an example, the inner tube 11 is shaped to fit the cavity of the outer tube 10. The outer tube 10 is made of steel, and the inner tube 11 is made of polytetrafluoroethylene. The inner tube 11 has good corrosion resistance and pressure resistance, and has a longer service life for conveying corrosive materials. Furthermore, even if a negative pressure is formed inside the inner tube 11, the inner tube 11's non-deformable characteristic can maintain a tight contact with the outer tube 10, and it is not easy for the inner tube 11 to deform inward and separate from the outer tube 10. The composite pipe fitting has a wide range of applications, which will not be elaborated here.

[0028] like Figure 2 , Figure 3 and Figure 4A connecting component is provided at the port of the outer tube 10 for connection and installation. The connecting component includes a retaining ring 20, a detachment ring 21, and a limiting groove 22. The detachment ring 21 is fixedly installed with the outer tube 10. The end of the retaining ring 20 is provided with a limiting groove 22, and the detachment ring 21 can be inserted into the limiting groove 22. The retaining ring 20 can rotate around the detachment ring 21. The end of the retaining ring 20 is provided with several holes for installation. Both the retaining ring 20 and the detachment ring 21 are annular structures. The limiting groove 22 is an annular groove. The detachment ring 21 and the limiting groove 22 cooperate with each other. The inner diameter of the detachment ring 21 is equal to the outer diameter of the outer tube 10. The end face of the detachment ring 21 is flush with the end face of the outer tube 10. The retaining ring 20 is provided on one side of the detachment ring 21. The depth of the limiting groove 22 is equal to the thickness of the detachment ring 21. The depth of the limiting groove 22 is less than the thickness of the retaining ring 20. The holes penetrate the retaining ring 20. The end faces of multiple retaining rings 20 are arranged in a ring array.

[0029] In this design, a retaining ring 20 and a locking ring 21 can be installed at the port of the outer pipe 10. The locking ring 21 is then welded to the outer pipe 10. When connecting the outer pipe 10 to the pipeline, the retaining ring 20 can be rotated, and the locking ring 21 can guide the retaining ring 20 within the limiting groove 22, allowing the locking ring 21 to maintain stable circumferential rotation. The position of the mounting hole can be adjusted by rotating the retaining ring 20, making it easy to ensure that the mounting hole of the retaining ring 20 is coaxial with the mounting hole of the pipeline flange. Similarly, when the other port of the outer pipe 10 is connected to another pipeline, the position of the mounting hole of the retaining ring 20 and the flange of the other pipeline port can also be adjusted. During installation, there will be no installation difficulties caused by the misalignment of the mounting holes of the two pipeline flanges, greatly improving the convenience and adaptability of installation. The retaining ring 20, which can rotate along the locking ring 21, can be finely adjusted to rotate a certain angle when the bolts lock the retaining ring 20 and the flange, reducing the probability of bolt breakage due to excessive shear force caused by expansion deformation when the retaining ring 20 is connected to the flange.

[0030] like Figure 3 , Figure 4 and Figure 5 As shown, the connecting assembly also includes positioning holes 23 and thrust blocks 24. The ends of the retaining ring 20 and the anti-disengagement ring 21 are provided with several identical positioning holes 23. The thrust blocks 24 can be inserted into the positioning holes 23 to position the retaining ring 20 and the anti-disengagement ring 21. The positioning holes 23 form semi-circular slots. The inner circumferential surface of the retaining ring 20 and the outer circumferential surface of the anti-disengagement ring 21 are provided with several corresponding positioning holes 23. The positioning holes 23 at the ends of the retaining ring 20 and the positioning holes 23 at the ends of the anti-disengagement ring 21 can be aligned with each other. The thrust blocks 24 form circular blocks. The thrust blocks 24 are interference-fitted with the positioning holes 23. The thickness of the thrust blocks 24 is equal to the depth of the positioning holes 23.

[0031] In this solution, as a supplementary explanation to the above solution, the retaining ring 20 can rotate around the anti-loosening ring 21. There may also be scenarios where it is necessary to lock the retaining ring 20 and the anti-loosening ring 21. By rotating the retaining ring 20, the positioning hole 23 at the end of the retaining ring 20 is aligned with the positioning hole 23 at the end of the anti-loosening ring 21 to form a circular hole. The thrust block 24 is then hammered into the two positioning holes 23, thereby locking the retaining ring 20 and preventing it from rotating around the anti-loosening ring 21. Then, the thrust block 24 can be spot-welded or not. The interference fit between the positioning hole 23 and the thrust block 24 can also prevent the thrust block 24 from falling off. Furthermore, when the retaining ring 20 is connected to the flange, the thrust block 24 is pressed into the positioning hole 23 by the flange. It has the ability to lock or not lock the retaining ring 20 and the anti-loosening ring 21, and the switching between the two usage modes is flexible and convenient, making it easy to install and operate.

[0032] The working principle of this utility model is as follows: A retaining ring 20 and a locking ring 21 can be installed at the end of the outer pipe 10. The locking ring 21 is then welded and fixed to the outer pipe 10. When connecting the outer pipe 10 to a pipeline, the retaining ring 20 can be rotated, and the locking ring 21 guides the retaining ring 20 within the limiting groove 22, ensuring stable circumferential rotation. The position of the mounting hole can be adjusted by rotating the retaining ring 20, facilitating the coaxiality of the mounting hole of the retaining ring 20 with the mounting hole of the pipe flange. Similarly, when the other end of the outer pipe 10 is connected to another pipeline, the position of the retaining ring 20 and the mounting hole of the flange at the other pipeline end can also be adjusted. During installation, there will be no installation difficulties caused by misalignment of the mounting holes of the two pipe flanges. The retaining ring 20 can... Rotating around the circumference of the anti-loosening ring 21, there may be scenarios where it is necessary to lock the retaining ring 20 and the anti-loosening ring 21. By rotating the retaining ring 20, the positioning hole 23 at the end of the retaining ring 20 is aligned with the positioning hole 23 at the end of the anti-loosening ring 21 to form a circular hole. The thrust block 24 is then struck into the two positioning holes 23, thereby locking the retaining ring 20 and preventing the retaining ring 20 from rotating around the circumference of the anti-loosening ring 21. Then, the thrust block 24 can be spot welded or left unwelded. The interference fit between the positioning hole 23 and the thrust block 24 can also prevent the thrust block 24 from falling off. Furthermore, when the retaining ring 20 is connected to the flange, the thrust block 24 is pressed into the positioning hole 23 by the flange, which has the function of locking or not locking the retaining ring 20 and the anti-loosening ring 21.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A steel-lined PTFE pipe fitting, characterized in that, include: An outer tube (10) and an inner tube (11) fixedly installed inside the outer tube (10); A connecting component is provided at the port of the outer tube (10) for connection and installation. The connecting component includes a retaining ring (20), a detachment ring (21), and a limiting groove (22). The detachment ring (21) is fixedly installed with the outer tube (10). The end of the retaining ring (20) is provided with a limiting groove (22). The detachment ring (21) can be inserted into the limiting groove (22). The retaining ring (20) can rotate around the detachment ring (21). The end of the retaining ring (20) is provided with several holes for installation.

2. The PTFE-lined steel pipe fitting according to claim 1, characterized in that: The retaining ring (20) and the anti-detachment ring (21) are both annular structures, and the limiting groove (22) is an annular groove. The anti-detachment ring (21) and the limiting groove (22) are used in conjunction with each other.

3. The PTFE-lined steel pipe fitting according to claim 1, characterized in that: The inner diameter of the anti-detachment ring (21) is equal to the outer diameter of the outer tube (10), the end face of the anti-detachment ring (21) is flush with the end face of the outer tube (10), the retaining ring (20) is disposed on one side of the anti-detachment ring (21), the depth of the limiting groove (22) is equal to the thickness of the anti-detachment ring (21), and the depth of the limiting groove (22) is less than the thickness of the retaining ring (20).

4. The PTFE-lined steel pipe fitting according to claim 1, characterized in that: The hole penetrates the retaining ring (20), and the end faces of multiple retaining rings (20) are arranged in a ring array.

5. The PTFE-lined steel pipe fitting according to claim 1, characterized in that: The connecting assembly also includes a positioning hole (23) and a thrust block (24). The ends of the retaining ring (20) and the anti-disengagement ring (21) are provided with several identical positioning holes (23). The thrust block (24) can be inserted into the positioning hole (23) to position the retaining ring (20) and the anti-disengagement ring (21).

6. The PTFE-lined steel pipe fitting according to claim 5, characterized in that: The positioning hole (23) forms a semi-circular groove. The inner circumferential surface of the retaining ring (20) and the outer circumferential surface of the anti-detachment ring (21) are provided with a plurality of corresponding positioning holes (23). The positioning holes (23) at the end of the retaining ring (20) and the positioning holes (23) at the end of the anti-detachment ring (21) can be aligned with each other.

7. The PTFE-lined steel pipe fitting according to claim 5, characterized in that: The thrust block (24) is formed into a circular block. The thrust block (24) is interference-fitted with the positioning hole (23). The thickness of the thrust block (24) is equal to the depth of the positioning hole (23).

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