Leak-proof composite steel pipe coated with plastic inside and outside

Abstract

The utility model belongs to the technical field of steel pipes, and particularly relates to a leakproof inner and outer plastic-coated composite steel pipe which comprises a first steel pipe. A second steel pipe is installed at one end of the steel pipe through a flange plate. The outer wall of the second steel pipe is slidably connected with a protective shell. A positioning groove is formed in the side wall of the protective shell; the outer wall of the first steel pipe is slidably connected with a movable ring. The outer wall of the moving ring is rotationally connected with a rotating ring; a clamping block is fixedly connected to the side, located on the movable ring, of the middle of the rotating ring. The clamping blocks are clamped in the positioning grooves; a through groove is formed in the side wall of one end part of the steel pipe; the middle of the through groove is slidably connected with a connecting block. Through cooperation of the movable ring, the rotating ring and the protective shell, the flange and the fixing bolt can be protected, the risk that the flange and the fixing bolt are corroded by water vapor and impurities in external air is reduced, the connection stability of the first steel pipe and the second steel pipe is improved, and the risk of leakage at the connection position of the first steel pipe and the second steel pipe is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of steel pipe technology, specifically a leak-proof internally and externally coated composite steel pipe. Background Technology

[0002] Internally and externally coated composite steel pipes belong to steel-plastic composite pipes. They use steel pipes as the base material and fuse a layer of plastic anti-corrosion layer to the inner and outer surfaces using a specific process. They are commonly used in devices that transport gases, liquids, or fluids containing solid particles.

[0003] Currently, most steel pipes are connected and installed using flanges or clamps, and then bolts and nuts are used to secure them to ensure the stability and sealing of the connection.

[0004] However, during the use of most internally and externally coated composite steel pipes, the connecting bolts and nuts are exposed to the external environment. Moisture and impurities in the outside air will corrode them, causing the bolts and nuts to loosen and leak at the pipe connection. This greatly reduces the practicality of such steel pipes. Therefore, a leak-proof internally and externally coated composite steel pipe is proposed to address the above problems. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model proposes a leak-proof internally and externally coated composite steel pipe.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A leak-proof internally and externally coated composite steel pipe of this utility model includes a steel pipe one; a steel pipe two is installed at one end of the steel pipe one via a flange; a protective shell is slidably connected to the outer wall of the steel pipe two; a positioning groove is provided on the side wall of the protective shell; a moving ring is slidably connected to the outer wall of the steel pipe one; a rotating ring is rotatably connected to the outer wall of the moving ring; a locking block is fixedly connected to the middle of the rotating ring on one side of the moving ring; the locking block is engaged in the positioning groove; a through groove is provided on the side wall of one end of the steel pipe; a connecting block is slidably connected to the middle of the through groove; the top of the connecting block is fixedly connected to the middle of the moving ring.

[0007] Preferably, a circular ring is slidably connected to the inner wall of one end of the steel pipe; the bottom of the connecting block is fixed to the side wall of the circular ring; a sealing ring is slidably connected to the inner wall of one end of the steel pipe on one side of the circular ring; a sealing groove is opened at both ends of the steel pipe; the sealing ring is engaged in the sealing groove; and a spring is connected between the circular ring and the sealing ring.

[0008] Preferably, both the inner and outer walls of the steel pipe are covered with a plastic coating, and both plastic coatings are covered with a weather-resistant layer.

[0009] Preferably, the outer wall of the movable ring has an annular groove; a positioning ring is fixedly connected to the middle of the rotating ring; and the positioning ring is slidably installed in the annular groove.

[0010] Preferably, the card blocks and positioning slots are provided in multiple sets, and the multiple sets of card blocks and positioning slots are distributed at equal intervals around the periphery.

[0011] Preferably, the positioning groove is an L-shaped groove.

[0012] Preferably, multiple springs are provided, and the multiple springs are distributed circumferentially at equal intervals between the sealing ring and the circular ring.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model provides a leak-proof internally and externally coated composite steel pipe. Through the cooperation between the set moving ring, rotating ring and protective shell, the flange and fixing bolt can be protected, reducing the risk of corrosion by water vapor and impurities in the outside air, improving the stability of the connection between steel pipe one and steel pipe two, and reducing the risk of leakage at the connection.

[0015] 2. This utility model provides a leak-proof internally and externally coated composite steel pipe. Through the coordinated cooperation of the ring, spring, sealing ring, sealing groove, and connecting block, the sealing performance between steel pipe one and steel pipe two can be ensured. Furthermore, compressing the spring can enhance the tightness between the sealing ring and the sealing groove, reduce the risk of loosening due to aging, and further improve the leak-proof performance. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a perspective view of the overall device of this utility model;

[0018] Figure 2 This is a three-dimensional sectional view of steel pipe one and steel pipe two in this utility model.

[0019] Figure 3 This is a three-dimensional sectional view of the steel pipe in this utility model.

[0020] Figure 4 This utility model Figure 2 A magnified 3D view of region A;

[0021] Figure 5 This is a three-dimensional sectional view of the protective shell and the movable ring in this utility model.

[0022] Legend:

[0023] 1. Steel pipe one; 11. Weather-resistant layer; 12. Plastic coating layer; 2. Steel pipe two; 3. Flange; 4. Moving ring; 41. Rotating ring; 42. Clamping block; 43. Protective shell; 44. Positioning groove; 45. Positioning ring; 46. Annular groove; 5. Circular ring; 51. Spring; 52. Sealing ring; 53. Sealing groove; 54. Connecting block; 55. Through groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] Specific implementation examples are given below.

[0026] Please see Figures 1-5This utility model provides a leak-proof internally and externally coated composite steel pipe, including a steel pipe 1, the end of which is connected to a steel pipe 2 via a flange 3. A protective shell 43 is slidably connected to the outer wall of the steel pipe 2, and a positioning groove 44 is provided on the side wall of the protective shell 43. A movable ring 4 is slidably connected to the outer wall of the steel pipe 1, and a rotating ring 41 is rotatably connected to the outer wall of the movable ring 4. A locking block 42 is fixedly connected to the middle of the rotating ring 41 on one side of the movable ring 4, and the locking block 42 is engaged within the positioning groove 44. A through groove 55 is provided on the side wall of the end of the steel pipe 1, and a connecting block 54 is slidably connected to the middle of the through groove 55. The top of the connecting block 54 is fixedly connected to the middle of the movable ring 4. During operation, steel pipe 1 and steel pipe 2 are fixedly connected together by flange 3. To reduce the risk of corrosion from moisture and impurities in the outside air to the bolts and nuts fixing flange 3, protective shell 43 can be pushed to cover the entire flange 3. Then, moving ring 4 is pushed, which drives rotating ring 41 to move. At the same time, moving ring 4 drives connecting block 54 to slide on the inner wall of through groove 55, ensuring that moving ring 4 can slide stably and horizontally on the outer wall of steel pipe 1 until moving ring 4 is in complete contact with protective shell 43. At this time, rotating ring 41 will be fitted onto the outer wall of protective shell 43. The locking block 42 is inserted into the positioning groove 44. Then, the rotating ring 41 can be rotated. The rotating ring 41 will drive the locking block 42 to slide on the inner wall of the positioning groove 44 and lock the locking block 42 in the positioning groove 44, ensuring the stability of the connection between the moving ring 4 and the protective shell 43. In this way, under the seal of the moving ring 4, the protective shell 43 can protect the entire flange 3 and the bolts and nuts that fix it, reducing the risk of the bolts and nuts being corroded and loosening, and improving the anti-leakage performance. In addition, it should be noted that the outer wall of the locking block 42 and the inner wall of the positioning groove 44 are interference fit, ensuring the stability of the locking block 42 in the positioning groove 44.

[0027] Furthermore, such as Figures 1-2 and Figure 4As shown, a ring 5 is slidably connected to the inner wall of one end of the steel pipe 1, and the bottom of the connecting block 54 is fixedly connected to the side wall of the ring 5. A sealing ring 52 is slidably connected to the inner wall of one end of the steel pipe 1 on one side of the ring 5. A sealing groove 53 is opened at the end of the second steel pipe 2, and the sealing ring 52 is engaged in the sealing groove 53. A spring 51 is fixedly connected to the side wall of the ring 5, and the other end of the spring 51 is fixedly connected to the side wall of the sealing ring 52, that is, a spring 51 is connected between the ring 5 and the sealing ring 52. During operation, when steel pipe 1 and steel pipe 2 are joined together, the sealing ring 52 is inserted into the sealing groove 53 to ensure the sealing of the connection between steel pipe 1 and steel pipe 2. Furthermore, when the moving ring 4 is joined with the protective shell 43, the moving ring 4 will drive the circular ring 5 to move through the connecting block 54. The circular ring 5 will compress the spring 51, and the spring 51 will apply the compressive force to the sealing ring 52 through its own elastic reaction force, ensuring that the sealing ring 52 fits more closely to the inner wall of the sealing groove 53, thereby improving the sealing between steel pipe 1 and steel pipe 2 and further improving the anti-leakage performance. In addition, the compressed spring 51 exerts a force on the locking block 42 through the circular ring 5, the connecting block 54, the moving ring 4, and the rotating ring 41, ensuring the stability of the locking block 42 in the positioning groove 44.

[0028] Furthermore, such as Figure 3 As shown, both the inner and outer walls of steel pipe 1 are covered with a plastic coating layer 12, and both plastic coating layers 12 are covered with a weather-resistant layer 11. During operation, applying the weather-resistant layer 11 and the plastic coating layer 12 to the inner and outer walls of steel pipe 1 can improve its service life and reduce the risk of cracking due to corrosion of its outer wall. Steel pipe 2 uses the same materials as steel pipe 1. Specifically, the weather-resistant layer 11 is mainly composed of polyethylene (PE), which has high chemical stability, is resistant to water and salt spray corrosion, has good UV resistance, good flexibility, can adapt to a certain degree of deformation, and is not prone to cracking. UV absorbers and antioxidants are also added to enhance its suitability for ordinary outdoor environments. The plastic coating layer 12 is mainly composed of epoxy resin (EP). Epoxy resin coatings have extremely high adhesion, high hardness, good impact resistance, and strong chemical corrosion resistance. This method can improve the external strength of steel pipe 1, further extending its service life.

[0029] Furthermore, such as Figure 4 As shown, the outer wall of the movable ring 4 has an annular groove 46, and a positioning ring 45 is fixedly connected to the middle of the rotating ring 41. The positioning ring 45 is slidably installed in the annular groove 46. During operation, through the cooperation between the positioning ring 45 and the annular groove 46, the rotating ring 41 can slide stably on the outer wall of the movable ring 4 when it rotates, reducing the risk of it disengaging from the movable ring 4 and ensuring the stability of the connection between the structures.

[0030] Furthermore, such as Figure 5As shown, multiple sets of locking blocks 42 and positioning slots 44 are provided, meaning that there are multiple locking blocks 42 and positioning slots 44, and the number of both is the same. Multiple locking blocks 42 are distributed circumferentially at equal intervals on the rotating ring 41, and multiple positioning slots 44 are distributed circumferentially at equal intervals on the protective shell 43. During operation, the multiple sets of locking blocks 42 and positioning slots 44 can improve the stability of the connection between the moving ring 4 and the protective shell 43.

[0031] Furthermore, such as Figures 1-2 As shown, the positioning groove 44 is an L-shaped groove. During operation, by setting the positioning groove 44 into an L-shape, the locking block 42 rotates when it is pushed into the positioning groove 44, so that it can be locked in the transverse groove of the positioning groove 44, ensuring the convenience and stability of locking.

[0032] Furthermore, such as Figure 2 As shown, multiple springs 51 are provided, and the multiple springs 51 are distributed circumferentially at equal intervals between the sealing ring 52 and the circular ring 5. During operation, the multiple springs 51 are pushed and squeezed when the circular ring 5 moves, which can evenly transmit the force to the sealing ring 52, ensuring the uniformity of its pressure and its fit.

[0033] Working principle: Steel pipe 1 and steel pipe 2 are fixedly connected together by flange 3. To reduce the risk of corrosion from moisture and impurities in the outside air to the bolts and nuts fixing flange 3, protective shell 43 can be pushed to cover the entire flange 3. Then, moving ring 4 is pushed, which drives rotating ring 41 to move. At the same time, moving ring 4 drives connecting block 54 to slide on the inner wall of through groove 55, ensuring that moving ring 4 can slide stably and horizontally on the outer wall of steel pipe 1 until moving ring 4 is in complete contact with protective shell 43. At this time, rotating ring 41 will be sleeved on the outer wall of protective shell 43. The outer wall of the moving ring 42 is inserted into the positioning groove 44. Then the rotating ring 41 can be rotated. The rotating ring 41 will drive the moving ring 42 to slide in the positioning groove 44 and lock the moving ring 42 in the positioning groove 44, ensuring the stability of the connection between the moving ring 4 and the protective shell 43. In this way, the protective shell 43 can protect the entire flange 3 and the bolts and nuts that fix it under the seal of the moving ring 4, reducing the risk of the bolts and nuts being corroded and loosening, and improving the anti-leakage performance. In addition, it should be noted that the outer wall of the moving ring 42 and the inner wall of the positioning groove 44 are interference fit, ensuring the stability of the moving ring 42 in the inner wall of the positioning groove 44.

[0034] When steel pipe 1 and steel pipe 2 are joined, the sealing ring 52 is inserted into the sealing groove 53 to ensure the sealing of the connection between steel pipe 1 and steel pipe 2. When the moving ring 4 is joined with the protective shell 43, the moving ring 4 will drive the ring 5 to move through the connecting block 54. The ring 5 will compress the spring 51. The spring 51 will apply the compressive force to the sealing ring 52 through its own elastic reaction force, ensuring that the sealing ring 52 fits more closely to the inner wall of the sealing groove 53, thereby improving the sealing between steel pipe 1 and steel pipe 2 and further improving the anti-leakage performance. In addition, the compressed spring 51 exerts a force on the locking block 42 through the ring 5, connecting block 54, moving ring 4 and rotating ring 41, ensuring the stability of the locking block 42 in the positioning groove 44.

[0035] 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 claimed utility model.

Claims

1. A leak-proof internally and externally coated composite steel pipe, comprising a steel pipe (1); characterized in that: Steel pipe one (1) is connected to steel pipe two (2) via flange (3) at one end; a protective shell (43) is slidably connected to the outer wall of steel pipe two (2); a positioning groove (44) is provided on the side wall of the protective shell (43); a moving ring (4) is slidably connected to the outer wall of steel pipe one (1); a rotating ring (41) is rotatably connected to the outer wall of the moving ring (4); a locking block (42) is fixedly connected to the middle of the rotating ring (41) on one side of the moving ring (4); the locking block (42) is locked in the positioning groove (44); a through groove (55) is provided on the side wall of the end of steel pipe one (1); a connecting block (54) is slidably connected to the middle of the through groove (55); the top of the connecting block (54) is fixedly connected to the middle of the moving ring (4).

2. The leak-proof internally and externally coated composite steel pipe according to claim 1, characterized in that: A ring (5) is slidably connected to the inner wall of the end of the first steel pipe (1); the bottom of the connecting block (54) is fixed to the side wall of the ring (5); a sealing ring (52) is slidably connected to the inner wall of the end of the first steel pipe (1) on one side of the ring (5); a sealing groove (53) is opened at the end of the second steel pipe (2); the sealing ring (52) is snapped into the sealing groove (53); a spring (51) is connected between the ring (5) and the sealing ring (52).

3. The leak-proof internally and externally coated composite steel pipe according to claim 1, characterized in that: The inner and outer walls of the steel pipe (1) are covered with a plastic coating layer (12), and both plastic coating layers (12) are covered with a weather-resistant layer (11).

4. The leak-proof internally and externally coated composite steel pipe according to claim 1, characterized in that: The outer wall of the moving ring (4) is provided with an annular groove (46); a positioning ring (45) is fixedly connected to the middle of the rotating ring (41); the positioning ring (45) is slidably installed in the annular groove (46).

5. The leak-proof internally and externally coated composite steel pipe according to claim 4, characterized in that: The card block (42) and positioning groove (44) are provided in multiple sets, and the multiple sets of card blocks (42) and positioning grooves (44) are distributed at equal intervals in the circumference.

6. The leak-proof internally and externally coated composite steel pipe according to claim 5, characterized in that: The positioning groove (44) is an L-shaped groove.

7. The leak-proof internally and externally coated composite steel pipe according to claim 2, characterized in that: Multiple springs (51) are provided, and the multiple springs (51) are distributed circumferentially at equal intervals between the sealing ring (52) and the circular ring (5).

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