Lining stainless steel composite pipe

Abstract

The utility model relates to the field of pipes, in particular to a stainless steel lined composite pipe. Comprising a pipe body, the pipe body comprises a stainless steel inner pipe and a plastic outer pipe wrapping the periphery of the stainless steel inner pipe, and the plastic outer pipe tightly wraps the stainless steel inner pipe and has inward contraction force. The utility model provides a stainless steel lined composite pipe. The composite pipe can improve the internal pressure resistance of a pipe.

Description

Technical Field

[0001] This application relates to the field of pipes, and in particular to a stainless steel-lined composite pipe. Background Technology

[0002] The descriptions in this section are provided only as background information related to this disclosure and do not constitute prior art. Pipes used in water supply applications are typically plastic pipes. Water supply pipes need to have high internal pressure resistance. However, plastic pipes in related technologies do not perform well in terms of internal pressure resistance, making them prone to deformation or breakage. Summary of the Invention

[0003] In view of this, this application provides a stainless steel-lined composite pipe, which can improve the pipe's resistance to internal pressure.

[0004] To achieve the above objectives, this application employs the following technical solution:

[0005] A stainless steel-lined composite pipe, characterized in that: it includes a pipe body, the pipe body comprising a stainless steel inner tube and a plastic outer tube wrapped around the outer periphery of the stainless steel inner tube, the plastic outer tube tightly wrapping the stainless steel inner tube and having an inward contraction force.

[0006] The present application discloses a stainless steel-lined composite pipe, which combines an inner stainless steel composite pipe and a plastic outer pipe. The stainless steel inner pipe offers good hygiene and resistance to internal pressure, while the plastic outer pipe continuously exerts an inward contraction force. When the stainless steel inner pipe is subjected to internal pressure, it experiences an outward expansion force. The inward contraction force of the plastic outer pipe can, to some extent, offset the expansion force generated by the internal pressure, thus reducing the actual stress on the pipe wall. This stress reduction helps lower the risk of pipe failure, thereby improving the pipe's resistance to internal pressure.

[0007] Preferably, the outer plastic tube and the inner stainless steel tube are in a tight fit. The outer plastic tube can be made of PP or PE material.

[0008] In some embodiments, the outer plastic tube is a round tube or a corrugated tube with alternating concave and convex shapes. A corrugated tube is preferred due to its superior mechanical properties.

[0009] In some embodiments, a spirally arranged rib is fixedly connected to the outer surface of the stainless steel inner tube, and the spiral rib extends into the body of the plastic outer tube. The spiral rib can increase the strength and ring stiffness of the tube.

[0010] In some embodiments, the spiral rib includes an integrally formed horizontal portion and an inclined portion, with a recess formed between the horizontal and inclined portions, making the axial cross-section of the spiral rib shaped like a "∠". The outer plastic tube extends into the recess of the spiral rib, and the horizontal portion of the spiral rib is fixedly welded to the inner stainless steel tube. The outer plastic tube extends into the recess of the spiral rib, and the spiral rib has a certain angle, allowing the outer plastic tube to form an interlocking structure with the spiral rib, making it difficult for the inner and outer layers to separate. During processing, the direction of the recess of the spiral rib is preferably directly opposite the direction of extrusion of the molten material into the outer plastic tube, so that the extruded material can enter the recess of the spiral rib, avoiding hollowness.

[0011] In some embodiments, the stainless steel inner tube is formed by spirally winding straight steel strands, with adjacent sides welded together. The spiral winding of the stainless steel inner tube means that its weld seams are not distributed in the circumferential direction, resulting in higher resistance to internal pressure compared to a straight weld seam structure.

[0012] In some embodiments, a socket end and a spigot end are fixedly provided at both ends of the pipe body, respectively. The socket end is used to receive the spigot end of another pipe. The socket end is provided with at least one alternating and stretchable expansion wave. The internal groove of the expansion wave is used to install a sealing ring. The outer wall of the spigot end can cooperate with the inner ring of the sealing ring. A first pair of locking members is fixedly provided on the socket end, with the first pair of locking members on the side of the socket end closer to the expansion wave. A second pair of locking members is fixedly provided on the pipe body, which can be fixedly locked with the first pair of locking members of the other pipe. The spigot end can axially abut against the socket end or pipe body of the other pipe. After the spigot end axially abuts against the socket end or pipe body of the other pipe, the axial position of the first pair of locking members relative to the second pair of locking members of the other pipe is adjustable, thereby adjusting the stretching degree of the expansion wave to adjust the tightness of the sealing ring.

[0013] To improve installation efficiency, a first pair of locking pieces and a second pair of locking pieces are used for locking connection. Compared with on-site heat fusion connection, installation is more convenient and efficient. Moreover, when the two pipes are connected, the axial position of the first pair of locking pieces relative to the second pair of locking pieces of the other pipe can be adjusted. This allows adjustment of the stretching degree of the expansion wave, thereby adjusting the extrusion pressure of the expansion wave on the sealing ring. In this way, the sealing performance of the sealing ring can be adjusted as needed, providing good flexibility.

[0014] In some embodiments, the first pair of locking elements is a first connecting disc; the second pair of locking elements is a second connecting disc, and the first connecting disc is connected to the second connecting disc of another pipe by a first bolt.

[0015] In some embodiments, the first pair of locking members is provided with one or more anti-disengagement hooks spaced apart circumferentially, and the second pair of locking members is provided with two or more slots spaced apart axially, wherein the anti-disengagement hooks are selectively engaged in the corresponding slots.

[0016] In some embodiments, the first pair of locking members is integrally formed with the socket end, and the socket end is connected to the pipe body by electrothermal fusion or injection molding; the second pair of locking members is connected to the pipe body by electrothermal fusion, and the second pair of locking members is spliced ​​together from two or more arc-shaped connecting units and fitted onto the pipe body.

[0017] As can be seen from the above technical solution, this application has at least the following advantages and positive effects:

[0018] This application discloses a stainless steel-lined composite pipe, which combines an inner stainless steel composite pipe and an outer plastic pipe. The stainless steel inner pipe has good hygiene properties and good resistance to internal pressure, while the plastic outer pipe continuously exhibits an inward contraction force. When the stainless steel inner pipe is subjected to internal pressure, it experiences an outward expansion force. The inward contraction force of the plastic outer pipe can, to some extent, offset the expansion force generated by the internal pressure, thereby reducing the actual stress on the pipe wall. This stress reduction helps lower the risk of pipe failure, thus improving the pipe's resistance to internal pressure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the first embodiment of this application;

[0020] Figure 2 This is a cross-sectional view of the first embodiment of this application;

[0021] Figure 3 This is a cross-sectional view of the second embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the structure of the third embodiment of this application;

[0023] Figure 5 This is a cross-sectional view of the third embodiment of this application;

[0024] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0025] Figure 7 This is a schematic diagram of the structure of the fourth embodiment of this application;

[0026] Figure 8 This is a schematic diagram of the structure of the fifth embodiment of this application.

[0027] Labeling Explanation: 1. Pipe body; 11. Stainless steel inner tube; 12. Plastic outer tube; 13. Spiral rib; 131. Horizontal part; 132. Beveled part; 133. Recessed part; 2. Socket end; 21. Expansion wave; 3. Spiral end; 4. Sealing ring; 5. First pair of locking parts; 6. Second pair of locking parts; 7. First bolt; 8. Heating wire; 9. Anti-disengagement hook; 10. Slot. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the application will be described in further detail below with reference to the accompanying drawings. The terminology used in the embodiments section of this application is only for explaining specific embodiments and is not intended to limit the application.

[0029] See Figures 1 to 2 This application provides a stainless steel-lined composite pipe, including a pipe body 1. The pipe body 1 includes a stainless steel inner tube 11 and a plastic outer tube 12 wrapped around the outer periphery of the stainless steel inner tube 11. The plastic outer tube 12 tightly wraps around the stainless steel inner tube 11 and has an inward contraction force.

[0030] This composite pipe combines an inner stainless steel composite pipe 11 and an outer plastic pipe 12. The stainless steel inner pipe 11 has good hygiene properties and good resistance to internal pressure, while the plastic outer pipe 12 continuously exerts an inward contraction force. When the stainless steel inner pipe 11 is subjected to internal pressure, it experiences an outward expansion force. The inward contraction force of the plastic outer pipe 12 can, to some extent, offset the expansion force generated by the internal pressure, thus reducing the actual stress on the pipe wall. This stress reduction helps lower the risk of pipe failure, thereby improving the pipe's resistance to internal pressure.

[0031] Preferably, the outer plastic tube 12 and the inner stainless steel tube 11 are in a tight fit. The outer plastic tube 12 can be made of PP or PE material. The outer plastic tube 12 is a round tube. The inner stainless steel tube 11 is selected to be a thin-walled tube with a thickness of 0.5-3mm.

[0032] In another embodiment, an elastic adhesive layer can be added between the stainless steel inner tube 11 and the plastic outer tube 12. This adhesive layer connects the stainless steel inner tube 11 and the plastic outer tube 12, preventing them from separating. Moreover, the elastic adhesive layer can evenly disperse the inward contraction force of the plastic outer tube 12.

[0033] See Figure 2 This illustrates another embodiment of the present application, which differs from Embodiment 1 in that the plastic outer tube 12 is a corrugated tube, which can be a solid or hollow corrugated tube.

[0034] See Figures 4 to 6This illustrates another embodiment of the present application. Compared to the above embodiment, this embodiment has a spirally arranged rib 13 fixedly connected to the outer surface of the stainless steel inner tube 11, and the spiral rib 13 extends into the body of the plastic outer tube 12. The spiral rib 13 can increase the strength and ring stiffness of the tube.

[0035] The spiral rib 13 includes an integrally formed horizontal portion 131 and inclined portion 132, with a recess 133 formed between the horizontal portion 131 and the inclined portion 132, making the axial cross-section of the spiral rib 13 shaped like a "∠". A plastic outer tube 12 extends into the recess 133 of the spiral rib 13, and the horizontal portion 131 of the spiral rib 13 is fixedly welded to the stainless steel inner tube 11. The plastic outer tube 12 extends into the recess 133 of the spiral rib 13, and the spiral rib 13 has a certain angle, allowing the plastic outer tube 12 to form an interlocking structure with the spiral rib 13, making it difficult for the inner and outer layers to separate. During processing, the direction of the recess 133 of the spiral rib 13 is preferably directly opposite the direction of extrusion of the molten material from the plastic outer tube 12, so that the extruded material can enter the recess 133 of the spiral rib 13, avoiding hollowness.

[0036] The stainless steel inner tube 11 is formed by spirally winding straight steel, with adjacent sides welded together. The spiral winding of the stainless steel inner tube 11 means that its weld seams are not distributed in the circumferential direction, resulting in higher resistance to internal pressure compared to a straight weld seam structure.

[0037] See Figure 7 This illustrates another embodiment of the present application, which differs from the above embodiment in that: a socket end 2 and a spigot end 3 are fixedly provided at both ends of the pipe body 1, the socket end 2 is used to receive the spigot end 3 of another pipe; at least one alternating and stretchable expansion wave 21 is provided in the socket end 2, the internal groove of the expansion wave 21 is used to install the sealing ring 4, the outer wall of the spigot end can cooperate with the inner ring of the sealing ring 4, and a first pair of locking members 5 are fixedly provided on the socket end 2. On the side of the expansion wave 21 closer to the socket end 2, the pipe body 1 is fixedly provided with a second pair of locking members 6 that can be fixedly locked with the first pair of locking members 5 of the other pipe; the spigot end 3 can axially abut against the socket end 2 or the pipe body 1 of the other pipe, and after the spigot end 3 axially abuts against the socket end 2 or the pipe body 1 of the other pipe, the axial position of the first pair of locking members 5 relative to the second pair of locking members 6 of the other pipe is relatively adjustable, so as to adjust the degree of stretching of the expansion wave 21 and adjust the tightness of the sealing ring 4.

[0038] To improve installation efficiency, a first pair of locking pieces 5 and a second pair of locking pieces 6 are used for locking connection. Compared with on-site heat fusion connection, the installation is more convenient and efficient. Moreover, when the two pipes are connected, the axial position of the first pair of locking pieces 5 relative to the second pair of locking pieces 6 of the other pipe can be adjusted. This allows adjustment of the stretching degree of the expansion wave 21, thereby adjusting the extrusion pressure of the expansion wave 21 on the sealing ring 4. In this way, the sealing performance of the sealing ring 4 can be adjusted as needed, providing good flexibility.

[0039] The first pair of locking pieces 5 is the first connecting plate; the second pair of locking pieces 6 is the second connecting plate, and the first connecting plate is connected to the second connecting plate of the other pipe by the first bolt 7.

[0040] In some embodiments, the first pair of locking elements 5 are integrally formed with the socket end 2, and the socket end 2 and the pipe body 1 are connected by heat fusion or injection molding through heating wire 8; the second pair of locking elements 6 are connected to the pipe body 1 by heat fusion through heating wire 8, and the second pair of locking elements 6 is composed of two or more arc-shaped connecting units spliced ​​together and fitted onto the pipe body 1.

[0041] See Figure 8 This illustrates another embodiment of the present application, in which the first pair of locking members 5 are provided with one or more anti-disengagement hooks 9 spaced apart circumferentially, and the second pair of locking members 6 are provided with two or more slots 10 spaced apart axially, with the anti-disengagement hooks 9 selectively engaging in the corresponding slots 10.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them; although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A stainless steel-lined composite pipe, characterized in that: The tube includes a pipe body, which comprises a stainless steel inner tube and a plastic outer tube wrapped around the outer periphery of the stainless steel inner tube. The plastic outer tube tightly wraps around the stainless steel inner tube and has an inward contraction force. A socket end and a spigot end are fixedly provided at both ends of the pipe body. The socket end is used to receive the spigot end of another pipe. The socket end is provided with at least one alternating concave and convex and stretchable expansion wave. The internal groove of the expansion wave is used to install a sealing ring. The outer wall of the spigot end can cooperate with the inner ring of the sealing ring. A first pair of locking members is fixedly provided on the socket end. The first pair of locking members is located on the side of the socket end closer to the expansion wave. A second pair of locking members is fixedly provided on the pipe body and can be fixedly locked with the first pair of locking members of the other pipe. The spigot end can axially abut against the socket end or pipe body of the other pipe. After the spigot end axially abuts against the socket end or pipe body of the other pipe, the axial position of the first pair of locking members relative to the second pair of locking members of the other pipe is adjustable, thereby adjusting the stretching degree of the expansion wave to adjust the tightness of the sealing ring.

2. The stainless steel-lined composite pipe according to claim 1, characterized in that: The outer plastic tube is either a round tube or a corrugated tube with alternating concave and convex shapes.

3. The stainless steel-lined composite pipe according to claim 1, characterized in that: The outer surface of the stainless steel inner tube is fixedly connected with a spirally arranged rib, which extends into the body of the plastic outer tube.

4. A stainless steel-lined composite pipe according to claim 3, characterized in that: The spiral rib includes an integrally formed horizontal part and an inclined part, with a recess formed between the horizontal part and the inclined part, so that the axial cross section of the spiral rib is "∠". The plastic outer tube extends into the recess of the spiral rib, and the horizontal part of the spiral rib is fixedly welded to the stainless steel inner tube.

5. A stainless steel-lined composite pipe according to claim 1, characterized in that: The stainless steel inner tube is formed by spirally winding straight steel, and adjacent sides are welded together.

6. A stainless steel-lined composite pipe according to claim 1, characterized in that: The first pair of locking components is a first connecting plate; the second pair of locking components is a second connecting plate, and the first connecting plate is connected to the second connecting plate of another pipe by a first bolt.

7. A stainless steel-lined composite pipe according to claim 1, characterized in that: The first pair of locking components is provided with one or more anti-disengagement hooks spaced apart circumferentially, and the second pair of locking components is provided with two or more slots spaced apart axially, wherein the anti-disengagement hooks are selectively engaged in the corresponding slots.

8. A stainless steel-lined composite pipe according to any one of claims 6 to 7, characterized in that: The first pair of locking components is integrally formed with the socket end, and the socket end is connected to the pipe body by electrothermal fusion or injection molding; the second pair of locking components is connected to the pipe body by electrothermal fusion, and the second pair of locking components is spliced ​​together from two or more arc-shaped connecting units and fitted onto the pipe body.

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