Anti-corrosion and water-rust-proof heating pipeline system

Abstract

The invention relates to the technical field of heating systems, and discloses an anti-corrosion and water-rust-proof heating pipeline system which comprises a main pipeline assembly used for conveying heating water, a pipe fitting assembly used for achieving steering and reducing of a pipeline and a valve assembly used for controlling on-off of water flow. The main pipeline assembly, the pipe assembly and the valve assembly are sequentially connected to form a closed channel for circulation of heating water, and no area where any carbon steel material makes direct contact with the heating water exists in the closed channel. The main pipeline assembly comprises a galvanized steel pipe base body, a PE-RT plastic lining is fixedly attached to the inner wall of the galvanized steel pipe base body, and the PE-RT plastic lining covers the whole carbon steel surface of the inner wall of the galvanized steel pipe base body. The system is ensured to have no welding spot through groove type or screw connection type connection, so that the damage of welding to the lining plastic layer and the lining teflon layer is avoided, and the source of water rust is effectively blocked; and the problem that the heat efficiency is reduced due to the fact that scale is formed due to water rust attachment of a conventional steel pipeline heating system is solved.

Description

Technical Field

[0001] This invention relates to the field of heating system technology, specifically to a corrosion-resistant and rust-resistant heating pipe system. Background Technology

[0002] In the current heating system field, steel pipes have become the most widely used pipe type in civil and industrial heating projects due to their controllable cost, high mechanical strength, and adaptability to the working pressure and temperature range of heating systems. Conventional steel pipe heating systems typically consist of ordinary hot-dip galvanized steel pipes as the main pipeline, assembled with seamless steel fittings (such as elbows and reducers) and ordinary steel valves. The core design of this type of system lies in using the hot-dip galvanized layer to provide preliminary protection to the carbon steel substrate to meet basic heating water transportation needs. However, in actual long-term operation, this conventional system has unavoidable technical defects: on the one hand, the zinc coating of ordinary hot-dip galvanized steel pipes is prone to defects due to process flaws during production (such as incomplete galvanizing, zinc layer defects, etc.). Damage caused by uneven thickness or mechanical damage during installation or use (such as collisions or friction) can lead to the carbon steel substrate of the pipe being directly exposed to the heating water. The oxygen, calcium ions, magnesium ions, and other components in the heating water (especially hard water or water that has not been thoroughly softened) will react with the carbon steel to form rust, which is mainly composed of iron oxide. As the water flows, this rust will gradually adhere to the heated surfaces of heat source equipment such as boilers and heat exchangers, forming a dense scale layer. This scale layer will significantly increase the heat conduction resistance, resulting in a significant reduction in the heat exchange efficiency of the heat source equipment. This not only causes energy waste (such as the boiler needing to consume more fuel to maintain the set heating temperature), but may also lead to the risk of equipment damage due to local overheating.

[0003] On the other hand, in conventional systems, the base material of seamless steel pipe fittings and ordinary steel valves is carbon steel. Even with simple anti-corrosion treatment on some components, direct contact with heating water cannot be completely avoided. Furthermore, potential differences exist between different metal components in the system (such as galvanized steel pipes, steel fittings, and steel valves). Under the influence of the heating water as an electrolyte medium, galvanic cells form, triggering electrochemical corrosion. This accelerates the corrosion rate of pipes and valves, leading to thinner pipe walls and reduced valve sealing performance, ultimately resulting in leaks and seepage. This not only increases the frequency and cost of heating system maintenance but also shortens the lifespan of the system. Shortening the lifespan of the entire heating pipe system, and in severe cases requiring complete system replacement, imposes a significant financial burden on users. Furthermore, conventional steel pipe heating systems often use welding to connect main pipes and fittings, and fittings and valves during assembly. The high temperatures during welding further damage the galvanized layer on the inner wall of the pipes, exacerbating the exposure of the localized carbon steel substrate and creating new corrosion starting points. This means that existing steel heating pipe systems cannot effectively solve the interconnected problems of rust formation, scale adhesion, and electrochemical corrosion, making it difficult to simultaneously ensure long-term stable operation and maintain thermal efficiency. Therefore, those skilled in the art propose a corrosion-resistant and rust-proof heating pipe system to address these issues. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a corrosion-resistant and rust-resistant heating pipe system, solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a corrosion-resistant and rust-proof heating pipeline system, comprising a main pipeline assembly for transporting heating water, a pipe fitting assembly for realizing pipeline turning and diameter change, and a valve assembly for controlling water flow interruption. The main pipeline assembly, pipe fitting assembly and valve assembly are connected in sequence to form a closed channel for heating water flow, and there is no area in the closed channel where any carbon steel material is in direct contact with the heating water.

[0006] The main pipeline assembly includes a galvanized steel pipe base, and a PE-RT plastic liner is fixedly attached to the inner wall of the galvanized steel pipe base. The PE-RT plastic liner covers the entire carbon steel surface of the inner wall of the galvanized steel pipe base to prevent heating water from contacting the carbon steel material of the galvanized steel pipe base.

[0007] The pipe fitting assembly includes elbows and reducers. The inner wall of the pipe fitting assembly is fixedly laminated with a PTFE lining layer. The PTFE lining layer covers the entire carbon steel surface of the inner wall of the pipe fitting assembly, and the two ends of the PTFE lining layer are seamlessly connected to the PE-RT plastic lining layer of the adjacent main pipeline assembly to prevent heating water from seeping into the carbon steel from the connection point.

[0008] All water-passing components in the valve assembly that come into direct contact with the heating water are made of 304 stainless steel.

[0009] The main pipeline assembly and fitting assembly, as well as the fitting assembly and valve assembly, are fixed by grooved or threaded connections. All connections in the entire heating pipeline system are free of welding points to prevent damage to the PE-RT plastic lining and PTFE lining during the welding process.

[0010] Preferably, the thickness of the PE-RT plastic liner is 0.5 to 3.0 mm, and the material of the PE-RT plastic liner must meet the temperature resistance performance of the heat-resistant polyethylene pipe in the heating water temperature environment, that is, no obvious deformation or cracking under long-term working temperature.

[0011] Preferably, the PE-RT plastic liner is bonded to the inner wall of the galvanized steel pipe substrate by hot-melt bonding, and the bonding area of ​​the PE-RT plastic liner to the inner wall of the galvanized steel pipe substrate accounts for ≥95% of the total area of ​​the inner wall of the galvanized steel pipe substrate, ensuring that no heating water comes into contact with the carbon steel through the gap between the liner and the substrate.

[0012] Preferably, when the length of a single section of the main pipeline assembly exceeds 5m, the joint of the PE-RT plastic liner between two adjacent sections of the main pipeline assembly is sealed by hot-melt welding. After welding, there is no leakage at the joint, and the tensile strength at the joint is not less than 85% of the tensile strength of the PE-RT plastic liner body.

[0013] Preferably, the base material of the pipe fitting assembly is carbon steel, the composite method of the PTFE lining layer and the base material of the pipe fitting assembly is molding composite, the thickness of the PTFE lining layer is 0.3-2.0mm, and there is no peeling phenomenon between the PTFE lining layer and the base material of the pipe fitting assembly, and it can still maintain a fixed and adhered state under long-term flushing of heating water.

[0014] Preferably, the elbows of the pipe fitting assembly include 90° elbows and 45° elbows, and the reducing joints include concentric reducing joints and eccentric reducing joints.

[0015] Preferably, the water-passing component of the valve assembly includes a valve core, a valve seat, an inner wall of the inlet port, and an inner wall of the outlet port. The valve core and valve seat are integrally formed 304 stainless steel structures, and the inner walls of the inlet port and the outlet port are made of 304 stainless steel or covered with a 304 stainless steel layer.

[0016] Preferably, the grooved connection includes a grooved joint, a clamp, and a seal; the inner wall of the grooved joint is provided with an annular protrusion adapted to the PE-RT plastic liner of the main pipeline assembly or the PTFE liner of the pipe fitting assembly; the seal is a high-temperature resistant rubber sealing ring, the working temperature range of which covers the design working temperature of the heating pipeline system, and the sealing ring can tightly fit the outer wall of the PE-RT plastic liner or the PTFE liner to prevent heating water leakage.

[0017] This invention provides a heating pipe system that is corrosion-resistant and waterproof. It has the following beneficial effects:

[0018] 1. This invention achieves complete isolation between the heating water flow and the carbon steel material by attaching a PE-RT plastic liner to the inner wall of the galvanized steel pipe body of the main pipeline unit, a PTFE liner that completely covers the carbon steel surface and is seamlessly connected to the PE-RT plastic liner to the inner wall of the fitting unit, and using 304 stainless steel for all water-passing components of the valve unit. Simultaneously, grooved or threaded connections ensure the system has no weld points, avoiding damage to the plastic and PTFE liners and effectively blocking the root cause of rust formation. Compared to conventional steel pipe heating systems where scale buildup due to rust reduces thermal efficiency, this system significantly reduces rust formation and scale buildup, while avoiding the risk of electrochemical corrosion, thus maintaining the thermal efficiency of the heat source equipment and the entire heating system in the long term and ensuring stable heating performance.

[0019] 2. In addition to achieving corrosion resistance, water and rust prevention, and scale prevention, this invention also boasts excellent structural stability and service life: the bonding design between the PE-RT plastic liner and the inner wall of the galvanized steel pipe, the composite design between the PTFE liner and the pipe fitting substrate, and the selection of 304 stainless steel water-passing components all adapt to the working temperature and pressure environment of the heating system, ensuring that each protective layer is not easily detached, damaged, or deformed during long-term use; the weldless connection method not only protects the integrity of the key protective layers but also simplifies the system installation and subsequent maintenance process, reducing potential hazards such as leakage and corrosion caused by welding defects. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating the component connection process of the present invention. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see the appendix Figure 1 This invention provides a corrosion-resistant and rust-proof heating pipeline system, including a main pipeline assembly for transporting heating water, a pipe fitting assembly for realizing pipeline turning and diameter change, and a valve assembly for controlling water flow interruption. The main pipeline assembly, pipe fitting assembly and valve assembly are connected in sequence to form a closed channel for heating water flow, and there is no area in the closed channel where any carbon steel material is in direct contact with the heating water.

[0023] The main pipeline assembly includes a galvanized steel pipe base, and a PE-RT plastic liner is fixedly attached to the inner wall of the galvanized steel pipe base. The PE-RT plastic liner covers the entire carbon steel surface of the inner wall of the galvanized steel pipe base to prevent the heating water from coming into contact with the carbon steel material of the galvanized steel pipe base.

[0024] Specifically, the main pipeline assembly adopts a composite structure design of "galvanized steel pipe substrate + PE-RT plastic liner fixedly bonded to the inner wall". The galvanized steel pipe substrate serves as the main structural support of the main pipeline, providing the system with mechanical strength and pressure resistance suitable for heating conditions, ensuring that the pipeline is not easily deformed or cracked due to pressure shock or external forces during long-term transportation of heating water. By fixing and bonding the PE-RT plastic liner to the inner wall of the galvanized steel pipe substrate, and ensuring that the liner completely covers the entire carbon steel surface of the inner wall, a physical isolation barrier is constructed between the heating water and the carbon steel material at the contact interface. On the one hand, PE-RT plastic material has excellent water resistance and... Its chemical stability prevents it from reacting with oxygen, calcium ions, magnesium ions, and other components in heating water, effectively avoiding oxidation and rust formation in the carbon steel substrate due to direct contact with heating water. Furthermore, the complete coverage design of this lining eliminates the risk of carbon steel exposure caused by defects such as incomplete galvanization or wear in the galvanized steel pipe substrate. Simultaneously, the heat resistance of the PE-RT material matches the operating temperature range of the heating system, making it less prone to softening, peeling, or cracking during long-term use, ensuring a consistently stable isolation effect. This effectively blocks the source of rust formation from the main pipeline, the core water transport channel, laying the foundation for the entire heating pipeline system's waterproof, rust-proof, scale-proof, and electrochemical corrosion-proof performance.

[0025] The thickness of the PE-RT plastic liner is 0.5–3.0 mm, and the material of the PE-RT plastic liner must meet the temperature resistance requirements of heat-resistant polyethylene pipes under heating water temperatures, meaning no significant deformation or cracking under long-term operating temperatures. The PE-RT plastic liner is bonded to the inner wall of the galvanized steel pipe substrate by hot-melt bonding. The bonding area between the PE-RT plastic liner and the inner wall of the galvanized steel pipe substrate accounts for ≥95% of the total area of ​​the inner wall of the galvanized steel pipe substrate, ensuring that heating water does not come into contact with the carbon steel through the gap between the liner and the substrate.

[0026] Specifically, the thickness of the PE-RT plastic lining is set at 0.5–3.0 mm, which ensures sufficient strength to resist water erosion and prevent damage, while avoiding increased transport resistance due to excessive thickness. It is required to have no significant deformation or cracking at heating water temperatures, ensuring structural stability even under long-term heating and preventing exposure of the carbon steel substrate. Hot-melt bonding with a bonding area ratio of ≥95% allows the lining to be tightly bonded to the inner wall of the galvanized steel pipe, reducing gaps and preventing heating water from seeping into the carbon steel through gaps. From the aspects of thickness, temperature resistance, and bonding sealing, the waterproof, rust-proof, and corrosion-proof effects of the main pipeline are guaranteed.

[0027] The pipe fitting assembly includes elbows and reducers. The inner wall of the pipe fitting assembly is fixedly laminated with a PTFE lining. The PTFE lining covers the entire carbon steel surface of the inner wall of the pipe fitting assembly, and both ends of the PTFE lining are seamlessly connected to the PE-RT plastic lining of the adjacent main pipeline assembly to prevent heating water from seeping into the carbon steel from the connection. The base material of the pipe fitting assembly is carbon steel, and the PTFE lining is laminated with the base material by molding. The thickness of the PTFE lining is 0.3-2.0 mm, and there is no peeling between the PTFE lining and the base material. It can still maintain a fixed and adhered state under long-term flushing of heating water.

[0028] Specifically, the pipe fitting assembly uses carbon steel as the base material to ensure structural strength, and the inner wall is molded with a 0.3-2.0mm thick PTFE lining. This PTFE lining can completely cover the inner wall of the carbon steel to block water contact, and the thickness can also ensure erosion resistance and compatibility. The molding process ensures that the PTFE lining does not peel off and adheres for a long time, and its two ends are seamlessly connected to the PE-RT lining of the main pipeline. This can prevent heating water from seeping into the carbon steel from the joint or the gap of the lining, thus ensuring the anti-corrosion and anti-rust effect of the pipe fitting assembly.

[0029] The pipe fittings include 90° elbows and 45° elbows, and the reducing fittings include concentric reducing fittings and eccentric reducing fittings.

[0030] Specifically, the pipe fittings include elbows in 90° and 45° sizes, and reducers in concentric and eccentric types, which can adapt to different installation requirements for heating pipe turning and diameter changes, ensuring flexible pipe layout. At the same time, combined with the protective design of the inner wall PTFE lining, it can ensure the isolation of water flow from carbon steel while meeting the system installation adaptability, maintaining the overall anti-corrosion and anti-rust effect.

[0031] All water-passing components in the valve assembly that come into direct contact with heating water are made of 304 stainless steel. The water-passing components of the valve assembly include the valve core, valve seat, inner wall of the inlet port, and inner wall of the outlet port. The valve core and valve seat are integrally formed 304 stainless steel structures, and the inner walls of the inlet port and outlet port are made of 304 stainless steel or covered with a 304 stainless steel layer.

[0032] Specifically, all water-passing components of the valve assembly, such as the valve core and valve seat, are made of 304 stainless steel (the valve core and valve seat are integrally formed, and the inner wall of the interface is made of stainless steel or covered with a stainless steel layer). This not only uses the corrosion resistance of 304 stainless steel to block the water flow from contacting the carbon steel, but also strengthens the protective sealing performance through the integral forming and stainless steel layer covering design, avoiding the formation of water rust and electrochemical corrosion, and ensuring the corrosion resistance and water rust resistance of the valve assembly.

[0033] The main pipeline components and fittings are fixed together, as are the fittings and valves, through grooved or threaded connections. There are no welding points at any connection point in the entire heating pipeline system to prevent the welding process from damaging the PE-RT plastic lining and PTFE lining.

[0034] Specifically, grooved or threaded connections are used for fixing between the main pipeline assembly and the fitting assembly, and between the fitting assembly and the valve assembly. This is because these two connection methods can achieve a stable connection without relying on welding, thus avoiding damage such as melting or cracking of the PE-RT plastic liner on the inner wall of the main pipeline assembly and the PTFE liner on the inner wall of the fitting assembly caused by the high temperature generated during welding. Furthermore, the design of having no welding points at any connection point in the entire system ensures that the PE-RT plastic liner and the PTFE liner remain intact at all times, continuously providing coverage and isolation for the carbon steel substrate, thereby preventing direct contact between the heating water and the carbon steel and ensuring the stable realization of the system's anti-corrosion and anti-rust functions.

[0035] When the length of a single section of the main pipeline component exceeds 5m, the joint of the PE-RT plastic liner between two adjacent sections of the main pipeline component shall be sealed by hot melt welding. After welding, there shall be no leakage at the joint, and the tensile strength at the joint shall not be less than 85% of the tensile strength of the PE-RT plastic liner body.

[0036] Specifically, when a single section of the main pipeline component exceeds 5m in length and needs to be spliced, the joint of the PE-RT plastic liner between two adjacent sections of the main pipeline is sealed by hot-melt welding. This is to prevent heating water from seeping into the carbon steel due to gaps at the joint. It is required that there be no leakage at the joint after welding, which can directly block the path of water seepage from the joint. The tensile strength of the joint is specified to be no less than 85% of the liner body, which can ensure that the joint is not easily cracked or damaged under long-term flushing of heating water and changes in system working pressure and temperature. This maintains the complete coverage and isolation effect of the PE-RT plastic liner on the carbon steel surface of the galvanized steel pipe substrate, ensuring the waterproof, rustproof and corrosion-resistant performance of the main pipeline component.

[0037] The grooved connection includes a grooved joint, clamps, and seals. The inner wall of the grooved joint is provided with an annular protrusion that is compatible with the PE-RT plastic liner of the main pipeline assembly or the PTFE liner of the pipe fitting assembly. The seal is a high-temperature resistant rubber sealing ring. The working temperature range of the high-temperature resistant rubber sealing ring covers the design working temperature of the heating pipeline system, and the sealing ring can tightly fit the outer wall of the PE-RT plastic liner or the PTFE liner to prevent heating water leakage.

[0038] Specifically, the grooved connection consists of a grooved joint, clamps, and seals. The inner wall of the grooved joint is equipped with an annular protrusion that is compatible with the PE-RT plastic lining of the main pipeline or the PTFE lining of the fittings. This ensures precise alignment between the joint and the protective lining of each component, preventing misalignment. The seals are made of high-temperature resistant rubber sealing rings, whose operating temperature covers the system's design operating temperature. This prevents the sealing rings from failing at high temperatures, and the sealing rings can fit tightly against the outer wall of the lining, further blocking the leakage of heating water from the connection gaps. Combined with the tightening effect of the clamps, this achieves a stable connection between the components while ensuring that the connection does not damage the protective lining or cause leakage, maintaining the overall anti-corrosion and anti-rust effect of the system.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant and rust-resistant heating pipe system, characterized in that, It includes a main pipeline assembly for transporting heating water, a pipe fitting assembly for realizing pipeline turning and diameter change, and a valve assembly for controlling the flow of water. The main pipeline assembly, pipe fitting assembly and valve assembly are connected in sequence to form a closed channel for the flow of heating water, and there is no area in the closed channel where any carbon steel material is in direct contact with the heating water. The main pipeline assembly includes a galvanized steel pipe base, and a PE-RT plastic liner is fixedly attached to the inner wall of the galvanized steel pipe base. The PE-RT plastic liner covers the entire carbon steel surface of the inner wall of the galvanized steel pipe base to prevent heating water from contacting the carbon steel material of the galvanized steel pipe base. The pipe fitting assembly includes elbows and reducers. The inner wall of the pipe fitting assembly is fixedly laminated with a PTFE lining layer. The PTFE lining layer covers the entire carbon steel surface of the inner wall of the pipe fitting assembly, and the two ends of the PTFE lining layer are seamlessly connected to the PE-RT plastic lining layer of the adjacent main pipeline assembly to prevent heating water from seeping into the carbon steel from the connection point. All water-passing components in the valve assembly that come into direct contact with the heating water are made of 304 stainless steel. The main pipeline assembly and fitting assembly, as well as the fitting assembly and valve assembly, are fixed by grooved or threaded connections. All connections in the entire heating pipeline system are free of welding points to prevent damage to the PE-RT plastic lining and PTFE lining during the welding process.

2. The corrosion-resistant and rust-resistant heating pipe system according to claim 1, characterized in that, The thickness of the PE-RT plastic liner is 0.5 to 3.0 mm, and the material of the PE-RT plastic liner must meet the temperature resistance performance of the heat-resistant polyethylene pipe in the heating water temperature environment, that is, no obvious deformation or cracking under long-term working temperature.

3. A corrosion-resistant and rust-resistant heating pipe system according to claim 1, characterized in that, The PE-RT plastic liner is bonded to the inner wall of the galvanized steel pipe substrate by hot-melt bonding. The bonding area of ​​the PE-RT plastic liner to the inner wall of the galvanized steel pipe substrate accounts for ≥95% of the total area of ​​the inner wall of the galvanized steel pipe substrate, ensuring that no heating water comes into contact with the carbon steel through the gap between the liner and the substrate.

4. A corrosion-resistant and rust-resistant heating pipe system according to claim 1, characterized in that, When the length of a single section of the main pipeline assembly exceeds 5m, the joint of the PE-RT plastic liner between two adjacent sections of the main pipeline assembly shall be sealed by hot melt welding. After welding, there shall be no leakage at the joint, and the tensile strength at the joint shall not be less than 85% of the tensile strength of the PE-RT plastic liner body.

5. A corrosion-resistant and rust-resistant heating pipe system according to claim 1, characterized in that, The base material of the pipe fitting assembly is carbon steel. The composite method of the PTFE lining layer and the base material of the pipe fitting assembly is molding composite. The thickness of the PTFE lining layer is 0.3-2.0mm, and there is no peeling phenomenon between the PTFE lining layer and the base material of the pipe fitting assembly. It can still maintain a fixed and attached state under long-term flushing of heating water.

6. A corrosion-resistant and rust-resistant heating pipe system according to claim 1, characterized in that, The pipe fitting assembly includes 90° elbows and 45° elbows, and the reducing joints include concentric reducing joints and eccentric reducing joints.

7. A corrosion-resistant and rust-resistant heating pipe system according to claim 1, characterized in that, The water-passing components of the valve assembly include a valve core, a valve seat, an inner wall of the inlet port, and an inner wall of the outlet port. The valve core and valve seat are integrally formed 304 stainless steel structures, and the inner walls of the inlet port and the outlet port are made of 304 stainless steel or covered with a 304 stainless steel layer.

8. A corrosion-resistant and rust-resistant heating pipe system according to claim 1, characterized in that, The grooved connection includes a grooved joint, a clamp, and a seal. The inner wall of the grooved joint is provided with an annular protrusion that is compatible with the PE-RT plastic liner of the main pipeline assembly or the PTFE liner of the pipe fitting assembly. The seal is a high-temperature resistant rubber sealing ring. The working temperature range of the high-temperature resistant rubber sealing ring covers the design working temperature of the heating pipeline system, and the sealing ring can tightly fit the outer wall of the PE-RT plastic liner or the PTFE liner to prevent heating water leakage.

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