Composite bellows

Abstract

The utility model discloses a kind of composite bellows, belong to pipeline field, including spiral bellows (100), the spiral bellows (100) including main pipe body (1), be located on the outer wall surface of main pipe body (1) outer coating (2), be located on the inner wall surface of main pipe body (1) inner coating (3), the spiral bellows (100) both ends are also provided with disc head (4), disc head (4) is closely matched in the end wall and outer wall of spiral bellows (100), disc head (4) is closely matched with the inner wall of inner coating (3) by being processed with the pressing strip (41) of one side of spiral bellows (100) inner wall, by disc head to pipe end three side wall is covered and fixed, it is favorable to keep the stable combination of outer coating, inner coating and main pipe body, prevent inner coating from being medium scouring arch or kick up, prolong the service life of pipeline.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline technology, specifically a composite corrugated pipe. Background Technology

[0002] Composite corrugated pipes are made by applying corrosion-resistant and rust-free coatings to the inner and outer walls of a metal spiral corrugated pipe to enhance the overall performance of the pipeline and extend its service life. Due to their unique structure, composite corrugated pipes have a wide range of applications, including municipal engineering, agricultural irrigation, industrial sewage discharge, and underground pipelines.

[0003] Currently, pipe connections typically utilize pan fittings with a connecting structure. These fittings are fixed to the outer wall of the pipe ends, achieving a rigid connection that seals against leaks and strengthens the structural integrity of the pipe ends. However, due to the unique structure of composite corrugated pipes, during application, the inner lining at both ends is often eroded or warped by the flowing medium, especially in the hollow cavities of the arched sections. Once the inner lining in these sections warps or warps, it connects the hollow cavity to the inside of the pipe, allowing the medium to flow along the spiral hollow cavity channel. This results in extensive corrosion and rust on the main pipe, significantly reducing the service life of the composite corrugated pipe. Utility Model Content

[0004] The purpose of this utility model is to provide a composite corrugated pipe to solve the problems of existing composite corrugated pipes, such as the inner lining being easily eroded and arched or warped, the medium flowing along the hollow cavity channel, causing large-area corrosion and rust of the main pipe, and affecting the service life of the pipe.

[0005] This utility model provides a composite corrugated pipe, including a spiral corrugated pipe. The spiral corrugated pipe includes a main pipe body, an outer cladding layer disposed on the outer wall of the main pipe body, and an inner cladding layer disposed on the inner wall of the main pipe body. The spiral corrugated pipe is also provided with a disc head at both ends. The disc head is tightly fitted to the end wall and the outer wall of the spiral corrugated pipe. A pressure strip that is tightly fitted to the inner wall of the inner cladding layer is also processed on the side of the disc head near the inner wall of the spiral corrugated pipe.

[0006] A further embodiment: the shape of the inner wall of the disc head is adapted to the outer cladding of the matching spiral bellows.

[0007] A further embodiment: the outer diameter of the end of the pan head near the end of the spiral corrugated pipe is larger than the outer diameter of the other end, the outer wall surface of the end of the pan head with the smaller outer diameter is inclined, and a flange is fitted on it.

[0008] A further embodiment: the transition outer wall between the larger and smaller outer diameter ends of the pan head is an arc surface, and the side of the flange near the transition outer wall between the larger and smaller outer diameter ends of the pan head is also an arc surface.

[0009] A further embodiment: The main body is formed by spirally coiling and connecting tubing. An arched groove is pressed in the middle of the tubing along the longitudinal direction, and an overlap is pressed in one side of the tubing along the longitudinal direction. At the spirally coiled connection of the tubing, the overlap overlaps the other side surface of the tubing to form a reinforcing part. The end of the overlap is connected to the other side surface of the tubing through an outer weld layer, and the overlap is connected to the other end face of the tubing through an inner weld layer.

[0010] A further embodiment: The overlap includes a bevel and a flat section, the inner wall of the flat section contacts the surface of the other side of the tube and strip, and a bevel gap is formed between the bevel and the end face of the tube and strip for filling the inner weld layer.

[0011] A further option: the lap edge and the arch groove are located on the same side.

[0012] A further solution: the arched groove and the reinforcing part both protrude outwards from the main body.

[0013] A further option: the inner lining is a planar layer that fits into the inner wall of the main body and forms a hollow cavity by the inner lining and the arched groove.

[0014] A further embodiment: the shape of the outer covering is adapted to the shape of the outer wall of the main body, and the thickness of the outer covering at the location of the reinforcing part is greater than the thickness of the outer covering at other locations.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The pan head fits tightly into the end wall and outer wall of the spiral corrugated pipe. The side of the pan head closest to the inner wall of the spiral corrugated pipe is also machined with a pressure strip that fits tightly into the inner wall of the inner cladding. By using the pan head to wrap and fix the three side walls of the pipe end, it is beneficial to maintain a stable bond between the outer cladding, the inner cladding and the main pipe body, prevent the inner cladding at the pipe end from being eroded by the medium and arched or warped, and extend the service life of the pipeline.

[0016] 2. The flange is positioned between the two pan heads to prevent damage during transportation and handling. The outer wall of the pan head with the smaller outer diameter is beveled, making it easy to push the flange to the appropriate position on the pan head.

[0017] 3. Press an overlap on one side of the pipe strip, and stack the overlap with the other side of the pipe strip to form a reinforcing part, which enhances the structural strength of the main pipe and extends the service life of the pipe. The beveled part of the overlap and the other side of the pipe strip are assembled to form a bevel gap, which is used to fill the inner weld layer, facilitates welding processing, and saves welding materials.

[0018] 4. The overlap and the arch groove are located on the same side, and the pipe strip can be pressed into shape in one go by the mold, which is convenient for processing and reduces forming errors. Attached Figure Description

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention.

[0021] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0022] Figure 3 This is a schematic diagram showing the connection of the tubing and belt.

[0023] Figure 4 This is a schematic diagram of the cross-section of the tube / strip.

[0024] In the diagram: 1-Main body; 11-Pipe strip; 12-Archway; 13-Overlap; 131-Sloping part; 132-Flat part; 2-Outer cladding; 3-Inner cladding; 4-Panel head; 41-Pressure strip; 5-Flange; 6-Inner weld layer; 7-Outer weld layer; 8-Hollow cavity. Detailed Implementation

[0025] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. In the description of this utility model, it should be understood that the use of terms such as "first" and "second" to define the components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0028] Please see Figures 1-2 As shown, this embodiment provides a composite corrugated pipe, including a spiral corrugated pipe 100. The spiral corrugated pipe 100 includes a main pipe body 1, an outer cladding layer 2 disposed on the outer wall of the main pipe body 1, and an inner cladding layer 3 disposed on the inner wall of the main pipe body 1. The spiral corrugated pipe 100 also has flanges 4 at both ends for connecting the pipes. The flanges 4 are tightly fitted to the end walls and outer walls of the spiral corrugated pipe 100. A pressure strip 41, which is tightly fitted to the inner wall of the inner cladding layer 3, is also machined on the side of the flange 4 closest to the inner wall of the spiral corrugated pipe 100. The head 4 is used to cover and fix the three side walls of the pipe end. The end wall of the head 4 covers the end wall of the spiral corrugated pipe 100 to prevent other substances from entering between the main body 1, the outer cover 2 and the inner cover 3, and to avoid the outer cover 2 and the inner cover 3 from lifting or falling off the main body 1. In particular, the pressure strip 41 forms an inverted pressing and fixing to the inner cover 3, which helps to maintain the stable combination of the outer cover 2, the inner cover 3 and the main body 1, prevents the inner cover 3 from being eroded by the medium and arching or lifting, and extends the service life of the pipeline.

[0029] Furthermore, the shape of the inner wall of the pan head 4 is adapted to the outer covering of the matching spiral bellows 100. The outer wall of the spiral bellows 100 has spiral corrugations, which connect with the pan head 4 to form an anti-slip effect.

[0030] In some embodiments, please refer to Figure 1, Figure 2 As shown, the outer diameter of the end of the pan head 4 near the end of the spiral bellows 100 is larger than the outer diameter of the other end. The outer wall surface of the end of the pan head 4 with the smaller outer diameter is inclined and fitted with a flange 5. The center hole of the flange 5 is larger than the outer diameter of the end of the pan head 4 with the smaller outer diameter and smaller than the outer diameter of the end of the pan head 4 with the larger outer diameter. The flange 5 is limited by the pan heads 4 at both ends of the spiral bellows 100.

[0031] Currently, existing technologies all use pan heads 4 with connecting structures. Even when the pipes are packaged in a rack during transportation, the connecting structure is easily bumped, causing it to loosen, be damaged, or detach from the pan head body, leading to rework. Furthermore, because the connecting structure needs high strength, it is usually made of metal, such as steel. To maintain a reliable connection between the connecting structure and the pan head body, the pan head body usually needs to be made of the same material as the connecting structure, increasing the manufacturing cost of the pan head body. The pan head 4 in this application does not have a connecting structure itself. Pipe segments are connected via flanges 5. The flanges 5 are movable. During transportation, the pipes are placed in a suitable rack, securing the flanges 5 relative to the spiral corrugated pipe 100 and the pan head 4. The racks are existing technology; their accommodating surface complements the outer surface of the pipe, allowing for clamping and limiting of the flanges 5, providing cushioning and preventing the flanges 5 from impacting the spiral corrugated pipe 100. Moreover, the pan head 4 can be made of plastic, reducing production costs.

[0032] Furthermore, the transition outer wall between the larger and smaller outer diameter ends of the pan head 4 is an arc surface, and the side of the flange 5 near the transition outer wall between the larger and smaller outer diameter ends of the pan head 4 is also an arc surface. When the two pipe sections are connected, the pan heads 4 are sealed together. The arc surface of the flange 5 matches the arc panel of the pan head 4, which can distribute stress. The flanges 5 at the ends of the two pipe sections are connected and fixed by bolts, which increases the service life of the pan head 4 and the flange 5, and enhances the impact and bending resistance of the pipe connection.

[0033] In some embodiments, please refer to Figures 1-3 As shown, the main body 1 is formed by spirally coiling and connecting tubing 11. An arched groove 12 is pressed longitudinally in the middle of the tubing 11, and an overlap 13 is pressed longitudinally on one side of the tubing 11. At the spirally coiled connection of the tubing 11, the overlap 13 overlaps the other side surface of the tubing 11 to form a reinforcing part. The end of the overlap 13 is connected to the other side surface of the tubing 11 through an outer weld layer 7, and the overlap 13 is connected to the other end face of the tubing 11 through an inner weld layer 6. The arched groove 12 and the reinforcing part both protrude outward from the main body 1.

[0034] An arched groove 12 is pressed longitudinally along the middle of the pipe strip 11 to form the spiral corrugations of the main pipe body 1. The arched structure disperses external pressure to a larger contact area, improving the ring stiffness of the pipe. An overlap 13 is pressed longitudinally on one side of the pipe strip 11. At the spiral coiled connection of the pipe strip 11, the overlap 13 overlaps the other side surface of the pipe strip 11 to form a reinforcing part protruding outwards from the main pipe body 1. This makes the inner wall of the reinforcing part of the main pipe body 1 smooth, facilitating the processing of the inner weld layer 6 and the outer weld layer 7, further improving the structural strength of the main pipe body 1 and extending the service life of the pipeline. The reinforcing part is located between two adjacent arched grooves 12 of the main pipe body 1. This allows for a larger pitch in the main pipe body 1 while ensuring its structural strength. For the same length of spiral corrugated pipe, this reduces the number of welds required to roll the main pipe body 1, improving the production efficiency of the spiral corrugated pipe.

[0035] The overlapping edge 13 and the arched groove 12 are located on the same side. The part of the tube strip 11 that has not been pressed and deformed is called the base. After being rolled into the main body 1, both the overlapping edge 13 and the arched groove 12 protrude outward from the main body 1. The tube strip 11 is made of steel strip, which can be pressed into shape in one go by a mold, which is convenient for processing and reduces forming errors.

[0036] In some embodiments, please refer to Figure 3 and Figure 4 As shown, the overlap 13 includes an inclined portion 131 and a flat portion 132. The inner wall surface of the flat portion 132 contacts the other side surface of the tube strip 11, and a bevel gap is formed between the inclined portion 131 and the other end face of the tube strip 11 for filling the inner weld layer 6. The distance between the inner wall surface of the flat portion 132 and the inner wall surface of the base is equal to the thickness of the tube strip 11. Both end faces of the tube strip 11 are flat, and a triangular bevel gap is formed between the inclined portion 131 and the other end face of the tube strip 11, which facilitates welding and saves welding materials.

[0037] In some embodiments, please refer to Figure 2 As shown, the inner cladding layer 3 is a planar layer that fits into the inner wall of the main body 1, and together with the arched groove 12, forms a hollow cavity 8. The hollow cavity 8 allows the main body 1 to absorb stress through slight deformation when subjected to external pressure, vibration, or temperature changes, reducing the risk of cracking. The shape of the outer cladding layer 2 is adapted to the shape of the outer wall of the main body 1, and the thickness of the outer cladding layer 2 at the reinforced location is greater than the thickness at other locations, enhancing the protective capability of the outer cladding layer 2.

[0038] The materials of the pan head 4, inner cladding 3 and outer cladding 2 in this application are thermoplastic plastics, such as polyethylene and polyvinyl chloride, which can be selected according to different usage environments; the tubing 11 can also be replaced by copper tubing, aluminum tubing or other materials according to usage requirements.

[0039] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A composite corrugated pipe, characterized in that, The spiral corrugated pipe (100) includes a main pipe body (1), an outer cladding layer (2) disposed on the outer wall of the main pipe body (1), and an inner cladding layer (3) disposed on the inner wall of the main pipe body (1). The spiral corrugated pipe (100) is also provided with a disc head (4) at both ends. The disc head (4) is tightly fitted to the end wall and outer wall of the spiral corrugated pipe (100). The side of the disc head (4) near the inner wall of the spiral corrugated pipe (100) is also processed with a pressure strip (41) that is tightly fitted to the inner wall of the inner cladding layer (3).

2. The composite corrugated pipe according to claim 1, characterized in that, The shape of the inner wall of the pan head (4) is adapted to the outer cladding of the matching spiral bellows (100).

3. A composite corrugated pipe according to claim 1, characterized in that, The outer diameter of one end of the pan head (4) near the end of the spiral bellows (100) is larger than the outer diameter of the other end. The outer wall surface of the end of the pan head (4) with the smaller outer diameter is inclined and fitted with a flange (5).

4. A composite corrugated pipe according to claim 3, characterized in that, The transition outer wall between the larger and smaller outer diameter ends of the pan head (4) is an arc surface, and the side of the flange (5) near the transition outer wall between the larger and smaller outer diameter ends of the pan head (4) is also an arc surface.

5. A composite corrugated pipe according to claim 1, characterized in that, The main body (1) is formed by spirally coiling and connecting the tubing (11). The tubing (11) has an arched groove (12) pressed along the longitudinal direction in the middle. The tubing (11) has an overlap (13) pressed along the longitudinal direction on one side. At the spirally coiled connection of the tubing (11), the overlap (13) overlaps the other side surface of the tubing (11) to form a reinforcing part. The end of the overlap (13) is connected to the other side surface of the tubing (11) through an outer weld layer (7). The overlap (13) is connected to the other end face of the tubing (11) through an inner weld layer (6).

6. A composite corrugated pipe according to claim 5, characterized in that, The overlap (13) includes a bevel (131) and a flat (132). The inner wall surface of the flat (132) contacts the other side surface of the tube (11), and a bevel gap is formed between the bevel (131) and the other side end face of the tube (11) to fill the inner weld layer (6).

7. A composite corrugated pipe according to claim 5, characterized in that, The overhang (13) and the arch groove (12) are located on the same side.

8. A composite corrugated pipe according to claim 6, characterized in that, The arch groove (12) and the reinforcing part both protrude outwards from the main body (1).

9. A composite corrugated pipe according to claim 5, characterized in that, The inner lining (3) is a planar layer. The inner lining (3) fits with the inner wall of the main body (1) and forms a hollow cavity (8) by enclosing the inner lining (3) and the arch groove (12).

10. A composite corrugated pipe according to claim 5, characterized in that, The shape of the outer covering (2) is adapted to the shape of the outer wall of the main body (1), and the thickness of the outer covering (2) corresponding to the position of the reinforcement is greater than the thickness of the outer covering (2) at other positions.

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