A pipeline with an integral inner wall of metal

Abstract

This utility model discloses a pipeline with an integral inner wall made of metal, consisting of pipe fittings and pipe material. The pipe fittings are all-metal, including a locking ring sleeve and an inner support guide fitting. The inner support guide fitting can be divided into an inner support core and a guide fitting. The outer wall of the pipe material is made of flexible resin and reinforced steel fiber composite, with a thin-walled metal inner tube bonded to the outer wall. This significantly reduces costs while ensuring the pressure resistance of the pipe material, and the flexible and easily deformable pipe wall facilitates crimping connections. The inner support core of the pipe fitting is inserted into the pipe port of the outer locking ring sleeve. A ring pressing device causes the locking ring sleeve to radially contract and deform, compressing the corresponding part of the pipe material inside the locking ring sleeve that is fitted onto the inner support core, thereby compressing the sealing material between the pipe material and the inner support core to achieve a sealed connection. Simultaneously, the inner end of the locking ring sleeve is crimped into the groove of the connection between the inner support core and the guide fitting. The inner support core and the locking ring sleeve crimp the inner and outer walls of the pipe to achieve pull-out resistance for the connection between the pipe material and the pipe fitting. The inner support core is sealed to the inner tube of the pipe, ensuring that the inner wall of the connected pipeline is entirely made of metal. This completely isolates the steel-plastic composite end face of the pipe from the high-pressure fluid, guaranteeing the overall quality and safety of the connected pipeline. This solution offers significant cost advantages, and its pressure resistance, hygiene, and corrosion resistance are all excellent, making it a promising solution with broad market prospects.

Description

Technical Field

[0001] This utility model relates to pipeline technology, mainly to a pipeline for transporting fluids constructed by connecting pipes and fittings, specifically a pipeline with an all-metal inner wall. Background Technology

[0002] Pipelines for transporting fluids are widely used in various fields, such as domestic water supply pipelines and gas pipelines. These pipelines are constructed from pipes and fittings, and can be made of metal, plastic, or a combination of both. Due to specific usage requirements (such as domestic water supply), the inner walls of these pipelines need to be entirely made of metal (such as copper or stainless steel). Currently, the construction of all-metal inner-walled pipelines primarily uses all-metal pipes and fittings, which generally results in high costs and significant complexity and difficulty in construction due to the hardness of the materials. Of course, there are also cost-reducing metal-plastic composite pipes in the existing technology, with thin-walled metal inner walls and plastic outer walls. However, these pipes also have defects in terms of high pressure resistance and connection. The thin-walled metal has weak pressure resistance, making it difficult to use for high-pressure fluid transportation. In particular, for the fittings connecting these pipes, there is a dilemma. First, if pure plastic fittings are chosen, the entire pipeline cannot have a completely metal inner wall. Second, if pure metal fittings are chosen, it is difficult to achieve pressure-resistant and tensile-resistant connections for these metal-plastic composite pipes. In particular, the steel-plastic composite end face of these metal-plastic composite pipes is not allowed to come into contact with high-pressure fluids, otherwise the high-pressure fluid will seep into the space between the metal and plastic composite layers, leading to quality and safety problems.

[0003] It is precisely because of the need to solve the aforementioned objective problems in this industry that this innovative solution was conceived and created, achieving an all-metal inner wall for pipelines while reducing costs and connection difficulties, and simultaneously meeting the technical requirements of high pressure resistance and pull-out resistance, ensuring the quality and safety of the pipes after connection. Utility Model Content

[0004] To address the aforementioned issues, this utility model aims to provide a pipeline with a high pressure resistance and low cost, featuring an all-metal inner wall, while ensuring safe and high-quality connections.

[0005] To achieve this technical objective, the present invention provides the following solution: a pipeline with an integral inner wall made of metal, consisting of pipes and fittings connected together. The pipes have a thin-walled metal inner tube bonded to an outer wall composed of a composite of flexible resin and reinforcing steel fibers wound around a ring tube. The fittings include a locking ring and an inner support guide fitting, both made of metal. The inner support guide fitting consists of an inner support core and a guide tube body. The maximum outer diameter of the inner support core matches the inner diameter of the inner tube, and the minimum inner diameter of the locking ring matches the outer diameter of the pipe. The locking ring is placed on the pipe end, and the inner support core of the fitting is inserted into the pipe end. A ring compression device causes the locking ring to radially contract and deform, compressing the pipe portion fitted onto the inner support core, thereby compressing the sealing material between the pipe and the inner support core to achieve a sealed connection between the pipe and the fitting. The inner wall of the connected pipeline is entirely made of metal.

[0006] To further enhance the pressure resistance of the pipe, the outer wall of the pipe is incorporating at least two layers of ring-wound reinforcing steel fibers, with the reinforcing steel fibers of adjacent layers symmetrically wound in opposite directions, forming a mesh-like reinforcing structure.

[0007] As a further improvement, the reinforcing steel fiber layer is made by winding steel fiber strips around the inner wall of the pipe. The steel fiber strips are formed by wrapping a set of flat steel wires with high-strength bonding resin. The steel wires are single steel wires or steel cords twisted from multiple steel wires with a diameter of 0.15-0.8mm. The steel wires in the steel fiber strips are arranged parallel to each other in the same plane and the spacing between adjacent steel wires is uniform.

[0008] Preferably, the port of the ring locking sleeve facing the corresponding guide tube body is inwardly recessed with an inner diameter smaller than the outer diameter of the tube; the connection between the inner support core of the inner support guide tube and the guide tube body is provided with adjacent high ring tube protrusions and low ring tube protrusions; the low ring tube protrusion is located on one side of the inner support core, and its outer diameter is larger than the inner diameter of the tube but smaller than the inner diameter of the inwardly recessed port of the ring locking sleeve; the high ring tube protrusion is located on one side of the guide tube body, and its outer diameter is larger than the outer diameter of the inwardly recessed port of the ring locking sleeve; a ring tube groove is formed between the high and low ring tube protrusions; when the inner support core is inserted into the tube port of the outer ring locking sleeve, the outer edge of the tube port abuts against the inwardly recessed port of the ring locking sleeve, and the inner edge of the tube port abuts against the low ring tube protrusion on the inner support guide tube; at the same time, the inwardly recessed port of the ring locking sleeve abuts against the high ring tube protrusion on the inner support guide tube, and the inwardly recessed port is fitted onto the ring tube groove; the ring pressing device causes the inwardly recessed port of the ring locking sleeve to radially shrink and deform, pressing it into the ring tube groove to form an engagement.

[0009] Preferably, the inner tube of the pipe is a thin-walled stainless steel pipe or a thin-walled copper pipe; the inner support guide pipe is a thin-walled stainless steel pipe or a thin-walled copper pipe; and the flexible resin is polyethylene (PE).

[0010] Preferably, the fitting further includes an elastic sealing ring, which is fitted around the inner support core to prevent high-pressure fluid from seeping out between the inner wall of the inner tube and the outer wall of the inner support core.

[0011] Preferably, the inner support core is provided with a concave annular groove for fitting an elastic sealing ring.

[0012] Preferably, the ring locking sleeve has an inner groove at the location corresponding to the ring groove, which facilitates the adaptation to deformation when the ring pressing device is pressed.

[0013] Preferably, the inner support core is coated with sealant to prevent high-pressure fluid from seeping out between the inner wall of the inner tube and the outer wall of the inner support core.

[0014] Preferably, the inner support core is further provided with a concave tensile ring groove for cooperating with the deformation of the tube to increase pull-out resistance; the ring locking sleeve is provided with an inner groove at least at the part corresponding to the concave tensile ring groove to facilitate the adaptation to deformation when the ring pressing device is pressed.

[0015] The beneficial effects of this utility model are as follows: The use of steel fiber reinforced thin-walled metal inner tube significantly enhances the pressure resistance of the pipe while reducing costs. The outer wall of the pipe, formed by flexible resin, further enhances its corrosion resistance and gives it flexible, easily deformable properties. This facilitates the pressure deformation of the corresponding metal pipe fitting's locking sleeve to achieve a sealed connection between the pipe and the fitting. Simultaneously, the inner end of the locking sleeve is pressed into the annular groove of the inner support core and the connecting pipe fitting, allowing the locking sleeve to strongly engage with the inner support and connecting pipe fitting. This further strengthens the axial tensile force exerted on the pipe by the fitting after the locking sleeve locks the outer wall of the pipe, significantly improving the pull-out resistance of the pipe-fitting connection. In particular, the sealing connection between the inner support core in the fitting and the inner tube of the pipe ensures that the inner wall of the connected pipeline is entirely made of metal, and completely isolates the steel-plastic composite end face of the pipe from the high-pressure fluid, ensuring the overall quality and safety of the connected pipeline. This solution offers significant advantages in pipeline cost, and boasts excellent pressure resistance, hygiene, and corrosion resistance, making it a promising option for the market. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of a pipe fitting (after the ring locking sleeve and the inner support guide pipe fitting are crimped) according to a preferred embodiment of the present utility model;

[0017] Figure 2 This is a cross-sectional view of the inner support guide pipe of a preferred embodiment of the present invention;

[0018] Figure 3 This is a cross-sectional view of the ring locking sleeve according to a preferred embodiment of the present invention;

[0019] Figure 4This is a schematic diagram of the preferred embodiment before the ring locking sleeve and the inner support guide pipe are connected;

[0020] Figure 5 This is a schematic diagram of the preferred embodiment after the ring locking sleeve and the inner support guide pipe are connected;

[0021] Figure 6 This is a cross-sectional view of the preferred pipe material of this utility model;

[0022] Figure 7 for Figure 6 Enlarged view of part A in the middle. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary preferred embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0024] This utility model relates to a pipeline with an all-metal inner wall, which is composed of a pipe 30 and connecting fittings. The inner wall of the pipeline is entirely made of metal, and the pipe 30 is a steel fiber reinforced plastic-coated metal pipe, that is, a metal and plastic composite pipe, as shown in the attached figure. Figure 6 , 7 As shown, the pipe has a thin-walled metal inner tube 31, which can be made of thin-walled stainless steel, thin-walled copper, or other metal or alloy materials. To enhance the pressure resistance of the inner tube, reinforcing steel fibers 34 are wound around the outer wall 33 of the pipe formed by flexible resin on the outer wall of the inner tube 31. In a preferred embodiment, the flexible resin is polyethylene (PE). This design combines the advantages of both plastics and metals. The steel fiber-reinforced thin-walled metal inner tube significantly enhances the pressure resistance of the pipe while reducing costs. The flexible resin-formed outer wall further enhances the corrosion resistance of the pipe and gives it a flexible and easily deformable property. This is beneficial for applying pressure and deformation to the corresponding metal fittings to achieve a pull-out-resistant sealing connection between the pipe and the fittings.

[0025] To achieve an all-metal inner wall for the pipeline, this invention requires not only that the pipe itself have an all-metal inner wall, but also that the fittings connecting the pipes be made of metal. Furthermore, it must ensure that the connected pipes and fittings form a perfectly sealed all-metal inner wall. In particular, the characteristics of the aforementioned pipe dictate that the steel-plastic composite end face of the pipe cannot come into contact with high-pressure fluid, as the high-pressure fluid would be forced into the space between the metal and plastic composite layers, leading to serious quality and safety issues due to damage and corrosion of the pipe. Therefore, this invention incorporates fittings designed to complement the pipe 30, as shown in the attached figure. Figures 1 to 5 As shown, the pipe fitting includes a metal ring-locking sleeve 11 and a metal inner support guide pipe fitting. The inner support guide pipe fitting is composed of an inner support core 21 and a guide pipe body 22 made of the same metal material. The maximum outer diameter of the inner support core 21 matches the inner diameter of the inner tube of the pipe 30, and the minimum inner diameter of the ring-locking sleeve 11 matches the outer diameter of the pipe 30. During connection, the ring-locking sleeve 11 is placed on the end of the pipe 30, and then the inner support core 21 of the pipe fitting is inserted into the end of the pipe 30. The ring-locking sleeve 11 is radially contracted and deformed by the ring-pressing device, which in turn compresses the corresponding part of the pipe 30 fitted on the inner support core 21 to achieve a pull-out-resistant sealing connection between the pipe and the fitting. This ensures that the inner wall of the connected pipeline is made of metal, and because the end face of the pipe is isolated from the high-pressure fluid by the inner support guide pipe fitting, the overall quality and safety of the connected pipeline are ensured.

[0026] In a preferred embodiment, to further enhance the pressure resistance of the pipe 30, at least two layers of reinforcing steel fibers 34 are wound around the outer wall of the inner tube 31 of the pipe 30, with each adjacent layer of reinforcing steel fibers interlacing to form a mesh reinforcement structure. To facilitate efficient production and further enhance the steel-plastic bonding performance, steel fiber strips (not shown) are used as reinforcing steel fibers wound around the outer wall of the inner tube of the pipe 30. The steel fiber strips are formed by a set of flat steel wires wrapped in high-strength bonding resin 35. The steel wires are single steel wires or steel cords twisted from multiple steel wires with a diameter of 0.15-0.8 mm. The steel wires in the steel fiber strips are arranged parallel to each other in the same plane, and the spacing between adjacent steel wires is uniform.

[0027] To further enhance the tensile strength of the pipe fittings and pipes after connection, as shown in the attached... Figure 1-5 In a preferred embodiment, the ring locking sleeve 11 is recessed towards the port of the corresponding guide tube body, forming a recessed port 113 with an inner diameter smaller than the outer diameter of the tube; the connection between the inner support core 21 of the inner support guide tube and the guide tube body 22 is further provided with adjacent high ring tube protrusions 212 and low ring tube protrusions 211 (e.g. Figure 2(As shown); the low ring tube protrusion 211 is located on one side of the inner support core 21. The outer diameter of the low ring tube protrusion 211 is larger than the inner diameter of the pipe 30, but the outer diameter of the low ring tube protrusion 211 is smaller than the inner diameter of the inner retracting port 113 of the ring lock sleeve 11. The purpose of this structure is to facilitate and accurately position the length of the pipe 30 inserted into the inner support core (without needing to draw lines for positioning the pipe), and to allow the inner retracting port of the ring lock sleeve to enter the ring tube groove 214 that needs to be engaged. The high ring tube protrusion 212 is located on one side of the guide tube body 22. The outer diameter of the high ring tube protrusion 212 is larger than the outer diameter of the inner retracting port 113 of the ring lock sleeve 11. The purpose of this structural design is to limit the depth of the ring lock sleeve 11 entering the guide tube body 22, and further facilitate and accurately position the pipe, the inner support core, and the ring lock sleeve, thereby improving installation efficiency and reducing installation errors.

[0028] Of particular importance is that a ring groove 214 is formed between the high ring protrusion 212 and the low ring protrusion 211. During construction, when the inner support core 21 is inserted into the pipe 30 port covered by the ring lock sleeve 11, the outer edge of the pipe port abuts against the inner closing port 113 of the ring lock sleeve 11, and the inner edge of the pipe port abuts against the low ring protrusion 211 on the inner support guide fitting, thus achieving precise and convenient positioning of the pipe. At the same time, the inner closing port 113 of the ring lock sleeve 11 abuts against the high ring protrusion 212 on the inner support guide fitting, and the inner closing port 113 is fitted onto the ring groove 214. The ring pressing device causes the inner closing port 113 of the ring lock sleeve 11 to radially shrink and deform, pressing it into the ring groove 214 to form an engagement. Simultaneously, the inner end 113 of the locking sleeve 11 is pressed into the annular groove 214 of the connection between the inner support core 21 and the guide pipe fitting 22, enabling the locking sleeve 11 to strongly engage with the inner support guide pipe fitting. After the locking sleeve 11 locks against the outer wall of the pipe, the axial tensile force generated by the entire pipe fitting on the pipe 30 is further strengthened, significantly improving the pull-out resistance of the pipe-fitting connection. In existing connection technologies, the locking sleeve and the inner support guide pipe fitting do not form an effective interlocking connection, which can easily lead to the locking sleeve and the pipe slipping off the inner support core and the guide pipe fitting together when the fluid pressure is high, making it difficult to achieve higher pull-out resistance requirements.

[0029] In addition, to enhance the pull-out resistance of the connection between the fitting and the pipe 30 after ring compression, such as Figure 2 , 3 As shown in Figure 4, a concave tensile ring groove 213 for cooperating with the deformation of the pipe 30 to increase tensile resistance can be constructed on the inner support core 21; the ring locking sleeve 11 is provided with an inner groove 112 at least at the position corresponding to the concave tensile ring groove 213. The purpose of doing so is to make the position of the inner groove 112 of the ring locking sleeve more adaptable to deformation when the ring pressing device is pressed, so that the pipe can better deform and engage with the concave tensile ring groove 213.

[0030] To achieve a better sealing effect, the pipe fitting also includes an elastic sealing ring 40, such as... Figure 5 As shown, the elastic sealing ring 40 is fitted around the inner support core 21 to prevent high-pressure fluid from seeping out between the inner wall of the inner tube and the outer wall of the inner support core. Further, as... Figure 4 , 5 As shown, the inner support core 21 is provided with a concave annular groove 215 for fitting the elastic sealing ring 40. In order to better compress the elastic sealing ring 40, the ring locking sleeve 11 is provided with an inner groove 111 at the position corresponding to the annular groove 215. The purpose of this is to make the inner groove 111 position of the ring locking sleeve more adaptable to deformation when the ring pressing device is pressed, so that the pipe can better deform and compress the elastic sealing ring 40 to further enhance the sealing effect.

[0031] To achieve a better sealing effect, a sealant can also be used, i.e., a sealant (not shown in the figure) is applied to the inner support core to prevent high-pressure fluid from seeping out between the inner wall of the inner tube and the outer wall of the inner support core.

[0032] The thin-walled metal inner tube involved in this solution can be formed by rolling and welding thin-walled metal strip, or by hot rolling of metal, or by cold drawing / cold rolling of metal.

[0033] This innovative design utilizes a steel fiber reinforced thin-walled metal inner tube, significantly enhancing the pipe's pressure resistance while reducing costs. The outer wall, formed by flexible resin, further enhances the pipe's corrosion resistance and imparts flexibility and deformability. This facilitates the pressure deformation of the corresponding metal fitting's locking sleeve to achieve a sealed connection between the pipe and fitting. Simultaneously, the inner end of the locking sleeve is pressed into the annular groove at the connection between the inner support core and the guide fitting, allowing the locking sleeve to firmly engage with the inner support guide fitting. This further strengthens the axial tensile force exerted on the pipe by the fitting after the locking sleeve locks the outer wall, significantly improving the pull-out resistance of the pipe-fitting connection. In particular, the sealed connection between the inner support core and the inner tube ensures that the inner wall of the connected pipeline is entirely metal, completely isolating the steel-plastic composite end face of the pipe from the high-pressure fluid, thus guaranteeing the overall quality and safety of the connected pipeline. This solution offers significant advantages in pipeline cost, and boasts excellent pressure resistance, hygiene, and corrosion resistance, making it a promising option for the market.

[0034] 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 pipeline with an integral metal inner wall, comprising pipes and fittings connected together, characterized in that, in: The tubing has a thin-walled metal inner tube bonded to an outer wall made of a composite of flexible resin and reinforcing steel fibers wound in a ring. The pipe fitting includes a ring locking sleeve and an inner support guide pipe fitting, both made of metal. The inner support guide pipe fitting consists of two parts: an inner support core and a guide pipe body. The maximum outer diameter of the inner support core matches the inner diameter of the pipe, and the minimum inner diameter of the ring lock sleeve matches the outer diameter of the pipe. The ring lock sleeve is placed on the pipe end, and then the inner support core of the pipe fitting is inserted into the pipe end. The ring lock sleeve is radially contracted and deformed by the ring pressing device, which squeezes and deforms the pipe part fitted on the inner support core, thereby compressing the sealing material between the pipe and the inner support core to achieve a sealed connection between the pipe and the fitting. The inner wall of the connected pipe is entirely made of metal.

2. The pipeline with an integral inner wall made of metal according to claim 1, characterized in that, The outer wall of the pipe is reinforced with at least two layers of ring-wound reinforcing steel fibers, with the reinforcing steel fibers of adjacent layers symmetrically wound in opposite directions, forming a mesh-like reinforcing structure.

3. The pipeline with an integral inner wall made of metal according to claim 2, characterized in that, The reinforcing steel fiber layer is made by winding steel fiber strips around the inner wall of the pipe. The steel fiber strips are formed by wrapping a set of flat steel wires with high-strength adhesive resin. The steel wires are single steel wires or steel cords twisted from multiple steel wires with a diameter of 0.15-0.8mm. The steel wires in the steel fiber strips are arranged parallel to each other in the same plane and the spacing between adjacent steel wires is uniform.

4. The pipeline with an integral inner wall made of metal according to claim 1, characterized in that: The port of the ring locking sleeve facing the corresponding connecting pipe body is inwardly tapered to an inner diameter smaller than the outer diameter of the pipe. The connection between the inner support core and the guide tube body of the inner support guide tube fitting is provided with adjacent high ring tube protrusions and low ring tube protrusions; the low ring tube protrusion is located on one side of the inner support core, and its outer diameter is larger than the inner diameter of the tube but smaller than the inner diameter of the inner closing port of the ring lock sleeve; the high ring tube protrusion is located on one side of the guide tube body, and its outer diameter is larger than the outer diameter of the inner closing port of the ring lock sleeve; a ring tube groove is formed between the high and low ring tube protrusions. When the inner support core is inserted into the pipe port of the outer ring locking sleeve, the outer edge of the pipe port abuts against the inner retracted port of the ring locking sleeve, and the inner edge of the pipe port abuts against the low ring protrusion on the inner support guide pipe fitting; at the same time, the inner retracted port of the ring locking sleeve abuts against the high ring protrusion on the inner support guide pipe fitting, and the inner retracted port is properly fitted onto the ring groove; the ring pressing device causes the inner retracted port of the ring locking sleeve to radially shrink and deform, pressing it into the ring groove to form an engagement.

5. The pipeline with an integral inner wall made of metal according to any one of claims 1 to 4, characterized in that, The inner tube of the pipe is a thin-walled stainless steel pipe or a thin-walled copper pipe; the inner support guide pipe is a thin-walled stainless steel pipe or a thin-walled copper pipe; the flexible resin is polyethylene (PE).

6. The pipeline with an integral inner wall made of metal according to claim 5, characterized in that, The pipe fitting also includes an elastic sealing ring, which is fitted around the inner support core to prevent high-pressure fluid from seeping out between the inner wall of the inner pipe and the outer wall of the inner support core.

7. The pipeline with an integral inner wall made of metal according to claim 6, characterized in that, The inner support core is provided with a concave annular groove for fitting an elastic sealing ring.

8. The pipeline with an integral inner wall made of metal according to claim 7, characterized in that, The ring locking sleeve has an inner groove at the location corresponding to the ring groove, which facilitates the adaptation to deformation when the ring pressing device is pressed.

9. The pipeline with an integral inner wall made of metal according to claim 5, characterized in that, The inner support core is coated with sealant to prevent high-pressure fluid from seeping out between the inner wall of the inner tube and the outer wall of the inner support core.

10. The pipeline with an integral inner wall made of metal according to claim 5, characterized in that, The inner support core is also provided with a concave tensile ring groove for cooperating with the deformation of the tube to increase pull-out resistance; the ring locking sleeve is provided with an inner groove at least at the part corresponding to the concave tensile ring groove to facilitate the adaptation to deformation when the ring pressing device is pressed.

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