Stainless steel polyethylene composite reinforced pipe fitting
By using a stepped combination structure and connection design of stainless steel and polyethylene pipes, the problem of interface cracking caused by the difference in thermal expansion coefficients is solved, achieving stable connection and sealing of the pipes, and improving the safety and service life of the pipes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU RUIDE TIANXIN TECH CO LTD
- Filing Date
- 2025-05-16
- Publication Date
- 2026-04-17
AI Technical Summary
The existing stainless steel and polyethylene pipe connection structure is prone to cracking at the joint due to the difference in thermal expansion coefficients when the temperature changes, which can lead to leakage and affect the safety and lifespan of the pipeline.
The structure is composed of polyethylene pipe and stainless steel pipe in a stepped configuration. It incorporates a sealing ring, a plastic corrugated pipe, and a connecting block. The elasticity of the sealing ring compensates for thermal expansion differences, the flexibility of the plastic corrugated pipe absorbs displacement and vibration, and the friction locking of the connecting block enhances connection stability.
It effectively disperses stress, prevents joint cracking, enhances connection stability, and improves the sealing performance and service life of pipelines.
Smart Images
Figure CN224135356U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipe fittings technology, and in particular to a stainless steel-polyethylene composite reinforced pipe fitting. Background Technology
[0002] In fields such as chemical engineering, building water supply and drainage, and oil and gas transportation, the stability and reliability of pipeline components are crucial. Stainless steel, with its high strength and corrosion resistance, and polyethylene, with its chemical resistance and flexibility, are ideal materials for composite applications, making them an important direction for improving pipeline performance. Stainless steel-polyethylene composite reinforced pipe fittings, as key components connecting pipelines of different materials, directly affect the safety and service life of the entire pipeline system.
[0003] In the existing technology, the connection between stainless steel and polyethylene pipes often adopts traditional mechanical connection structures, such as threaded connection, flange connection or simple socket connection. These structures mainly achieve the connection through mechanical fastening force or local sealant. Their technical principle is mostly based on rigid fixation or simple physical bonding, focusing on meeting basic connection strength and sealing requirements.
[0004] However, stainless steel and polyethylene have significantly different coefficients of thermal expansion. Existing connection structures lack effective stress dispersion design, and when the temperature changes, the two materials will generate large internal stress at the interface due to the different expansion or contraction amounts. The long-term accumulation of this internal stress can easily lead to cracking at the interface, which in turn can cause leakage of substances inside the pipe. This not only affects the normal operation of the pipe components, but also brings safety hazards, seriously restricting the widespread application of stainless steel and polyethylene composite pipes in temperature-changing environments. To address this issue, a stainless steel-polyethylene composite reinforced pipe fitting is proposed. Utility Model Content
[0005] To overcome the above shortcomings, this utility model provides a stainless steel-polyethylene composite reinforced pipe fitting, which aims to improve the problem that the large difference in the thermal expansion coefficients of stainless steel and polyethylene makes the joint prone to cracking and leakage of substances inside the pipe when the temperature changes.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A stainless steel-polyethylene composite reinforced pipe fitting includes a polyethylene pipe, a stainless steel pipe disposed on the outer wall of the polyethylene pipe, a connecting assembly disposed between the polyethylene pipe and the stainless steel pipe, one end of the stainless steel pipe extending to the outside of the polyethylene pipe, so that the polyethylene pipe and the stainless steel pipe are combined into a stepped structure, sealing rings are fixedly connected to both sides of the inner wall of the stainless steel pipe, and multiple sealing rings are engaged with the inside of the polyethylene pipe, and a plastic corrugated pipe is fixedly connected to the outer wall of the stainless steel pipe.
[0008] As a further description of the above technical solution:
[0009] The plastic corrugated pipe is made of polyethylene and has multiple concave and convex surfaces on its surface, all of which are circular.
[0010] As a further description of the above technical solution:
[0011] The inner wall of the sealing ring is provided with multiple triangular inclined surface structures, and the shape of the groove on the inner wall of the polyethylene pipe matches the inner wall of the sealing ring, so that the groove on the inner wall of the polyethylene pipe and the sealing ring are fully engaged.
[0012] As a further description of the above technical solution:
[0013] The connecting assembly includes a first connecting block and a second connecting block, with the outer wall of the first connecting block fixedly connected to the inner wall of the stainless steel pipe.
[0014] As a further description of the above technical solution:
[0015] The polyethylene pipe has a groove inside, and a connecting block 2 is fixedly connected to the inner wall of the groove. The outer wall surface of the connecting block 1 is on the same horizontal plane as the outer wall surface of the polyethylene pipe.
[0016] As a further description of the above technical solution:
[0017] Both connecting block one and connecting block two have corrugated surfaces on opposite sides, and the corrugated surfaces on both sides engage with each other.
[0018] As a further description of the above technical solution:
[0019] Multiple friction particles are provided on the corrugated surfaces on both sides to ensure that the corrugated surfaces on both sides are fully engaged and fixed.
[0020] This utility model has the following beneficial effects:
[0021] 1. In this utility model, stress is dispersed by the stepped structure composed of polyethylene pipe and stainless steel pipe and the soft characteristics of the uneven surface of the plastic corrugated pipe, which achieves a good protective effect on the product surface. It solves the problem that the large difference in thermal expansion coefficient between stainless steel and polyethylene makes it easy for the interface to crack and leak internal substances when the temperature changes, thus enhancing the connection effect between pipes.
[0022] 2. In this utility model, the triangular structure of the inner wall of the sealing ring and the corrugated surface and friction particles of the outer walls of connecting block one and connecting block two achieve a good connection effect between polyethylene pipe and stainless steel pipe, solving the problem that stainless steel and polyethylene are prone to delamination and peeling after long-term use due to poor material compatibility, and enhancing the stability of the connection between polyethylene pipe and stainless steel pipe. Attached Figure Description
[0023] Figure 1 This is a three-dimensional schematic diagram of a stainless steel-polyethylene composite reinforced pipe fitting proposed in this utility model;
[0024] Figure 2 This is a schematic diagram of the plastic corrugated pipe structure of a stainless steel-polyethylene composite reinforced pipe fitting proposed in this utility model.
[0025] Figure 3 This is a schematic diagram of the cross-sectional structure of a stainless steel pipe for a stainless steel-polyethylene composite reinforced pipe fitting proposed in this utility model.
[0026] Figure 4 This is a schematic diagram of the connecting block of a stainless steel-polyethylene composite reinforced pipe fitting proposed in this utility model.
[0027] Figure 5 This is a schematic diagram of the sealing ring structure of a stainless steel-polyethylene composite reinforced pipe fitting proposed in this utility model.
[0028] Legend:
[0029] 1. Polyethylene pipe; 2. Plastic corrugated pipe; 3. Stainless steel pipe; 4. Sealing ring; 5. Connecting block one; 6. Connecting block two. Detailed Implementation
[0030] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0031] Reference Figures 1-3This utility model provides an embodiment of a stainless steel-polyethylene composite reinforced pipe fitting, comprising a polyethylene pipe 1, a stainless steel pipe 3 disposed on the outer wall of the polyethylene pipe 1, a connecting assembly disposed between the polyethylene pipe 1 and the stainless steel pipe 3, one end of the stainless steel pipe 3 extending to the outside of the polyethylene pipe 1, forming a stepped structure between the polyethylene pipe 1 and the stainless steel pipe 3. The stepped structure, together with sealing rings 4, disperses axial force, achieving a uniform force transmission effect. Sealing rings 4 are fixedly connected to both sides of the inner wall of the stainless steel pipe 3, and multiple sealing rings 4 engage with the inside of the polyethylene pipe 1. The sealing rings 4 are used to elastically compensate for thermal expansion differences and prevent tearing at the joint. A plastic corrugated pipe 2 is fixedly connected to the outer wall of the stainless steel pipe 3. The corrugated tube 2 is made of polyethylene and has multiple concave and convex surfaces. The plastic corrugated tube 2, in conjunction with the concave and convex surface structure, undergoes bending deformation to absorb displacement and vibration. All the concave and convex surfaces are circular structures. The circular concave and convex surface structure, in conjunction with the plastic corrugated tube 2, allows for multi-directional deformation, enhancing the uniformity of stress release. The inner wall of the sealing ring 4 has multiple triangular bevel structures. The triangular bevel structures, in conjunction with the grooves on the inner wall of the polyethylene tube 1, tightly engage to enhance the sealing effect. The shape of the grooves on the inner wall of the polyethylene tube 1 matches the inner wall of the sealing ring 4, ensuring a full engagement between the grooves on the inner wall of the polyethylene tube 1 and the sealing ring 4. The groove structure on the inner wall, in conjunction with the triangular bevels, provides an anchoring connection, preventing delamination.
[0032] Reference Figures 3-5 The connecting components include connecting block 5 and connecting block 6. The outer wall of connecting block 5 is fixedly connected to the inner wall of stainless steel pipe 3. Connecting block 5, in conjunction with the corrugated surface, achieves friction locking, thereby enhancing the connection stability. A groove is opened inside the polyethylene pipe 1, and connecting block 6 is fixedly connected to the inner wall of the groove. The groove structure, in conjunction with connecting block 6, is used for positioning and installation, ensuring the assembly accuracy. The outer wall surface of connecting block 5 and the outer wall surface of polyethylene pipe 1 are on the same horizontal plane. The horizontal plane structure, in conjunction with the stepped nesting, transmits force and optimizes the force distribution. Corrugated surfaces are provided on opposite sides of connecting block 5 and connecting block 6. The two corrugated surfaces interlock with each other. The corrugated surfaces are treated with sandblasting to enhance friction and improve the anti-slip ability. Multiple friction particles are provided on the corrugated surfaces on both sides. The friction particles, in conjunction with the corrugated surfaces, perform micro-interlocking, further preventing relative displacement.
[0033] Working Principle: During product use, the stepped nested structure composed of polyethylene pipe 1 and stainless steel pipe 3 guides the uniform distribution of axial force. The elasticity of the sealing ring 4 compensates for thermal expansion differences, preventing direct tearing of the joint and ensuring a good seal between the polyethylene pipe 1 and the stainless steel pipe 3. Because the surface of the plastic corrugated pipe 2 is made of soft polyethylene material with multiple concave and convex surfaces, it possesses flexibility and a certain degree of elasticity. Therefore, it can absorb product displacement and vibration, alleviate stress caused by thermal expansion and contraction, and achieve a good protective effect on the product surface. This solves the problem of the large difference in thermal expansion coefficients between stainless steel and polyethylene (approximately 17×10⁻⁶ for stainless steel). -6 / ℃, while polyethylene is approximately 110×10 -6 / ℃, therefore, the interface is prone to cracking when the temperature changes, which can lead to leakage of substances inside the pipe. This enhances the product's connection effect between pipes.
[0034] During the connection process between polyethylene pipe 1 and stainless steel pipe 3, the sealing ring 4 on the inner wall of stainless steel pipe 3 engages with the groove inside polyethylene pipe 1. Since the inner wall of sealing ring 4 has multiple triangular bevels, a good connection and fixation effect is achieved between the inner wall of sealing ring 4 and the groove inside polyethylene pipe 1. Simultaneously, the corrugated structure on opposite sides of connecting block 5 on the inner wall of stainless steel pipe 3 and connecting block 6 on the outer groove of polyethylene pipe 1 creates an anchoring effect. Furthermore, since the corrugated surfaces of connecting block 5 and connecting block 6 have been pre-sandblasted, the friction between them is enhanced, achieving a good connection between polyethylene pipe 1 and stainless steel pipe 3. This solves the problem of delamination and peeling that easily occurs after long-term use due to poor material compatibility between stainless steel and polyethylene, thus enhancing the stability of the connection between polyethylene pipe 1 and stainless steel pipe 3.
[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A stainless steel polyethylene composite reinforced pipe fitting comprising a polyethylene pipe (1) characterised in that: The outer wall of the polyethylene pipe (1) is provided with a stainless steel pipe (3), and a connecting component is provided between the polyethylene pipe (1) and the stainless steel pipe (3). One end of the stainless steel pipe (3) extends to the outside of the polyethylene pipe (1), so that the polyethylene pipe (1) and the stainless steel pipe (3) are combined into a stepped structure. Both sides of the inner wall of the stainless steel pipe (3) are fixedly connected with sealing rings (4), and multiple sealing rings (4) are engaged with the inside of the polyethylene pipe (1). The outer wall of the stainless steel pipe (3) is fixedly connected with a plastic corrugated pipe (2).
2. The stainless steel-polyethylene composite reinforced pipe fitting according to claim 1, characterized in that: The plastic corrugated pipe (2) is made of polyethylene and has multiple concave and convex surfaces on its surface, all of which are circular structures.
3. A stainless steel polyethylene composite reinforced pipe fitting according to claim 1, characterized in that: The inner wall of the sealing ring (4) is provided with multiple triangular inclined surface structures, and the shape of the groove on the inner wall of the polyethylene pipe (1) matches the inner wall of the sealing ring (4), so that the groove on the inner wall of the polyethylene pipe (1) and the sealing ring (4) are fully engaged.
4. A stainless steel polyethylene composite reinforced pipe fitting according to claim 1, characterized in that: The connecting assembly includes a first connecting block (5) and a second connecting block (6), with the outer wall of the first connecting block (5) fixedly connected to the inner wall of the stainless steel pipe (3).
5. A stainless steel polyethylene composite reinforced pipe fitting according to claim 4, characterized in that: The polyethylene pipe (1) has a groove inside, and a connecting block two (6) is fixedly connected to the inner wall of the groove. The outer wall surface of the connecting block one (5) is on the same horizontal plane as the outer wall surface of the polyethylene pipe (1).
6. A stainless steel polyethylene composite reinforced pipe fitting according to claim 5, characterized in that: Corrugated surfaces are provided on opposite sides of the connecting block one (5) and the connecting block two (6), and the corrugated surfaces on both sides engage with each other.
7. A stainless steel-polyethylene composite reinforced pipe fitting according to claim 6, characterized in that: Multiple friction particles are provided on the corrugated surfaces on both sides to ensure that the corrugated surfaces on both sides are fully engaged and fixed.