Bacteriostatic, anti-scale and corrosion-resistant electric heating tube
By forming an antibacterial and anti-scaling coating and a high thermal conductivity insulation layer on the surface of the heating element, the problems of reduced heat conduction efficiency and safety hazards caused by scale deposition are solved, and uniform heat distribution and improved equipment stability are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2026-04-03
AI Technical Summary
Traditional electric heaters suffer from reduced heat transfer efficiency, uneven heat distribution, and safety hazards due to scale buildup, which affects equipment lifespan and stability.
The antibacterial and anti-scaling coating is formed by the composite curing of a polymer matrix material and conductive metal particles. Combined with a high thermal conductivity insulating layer and a modified magnesium oxide layer, it forms a gradient heat conduction path, inhibiting scale deposition and distributing heat evenly.
It effectively inhibits scale buildup, increases thermal efficiency by 25%-40%, extends equipment life, reduces safety hazards, and enhances the corrosion resistance and antibacterial effect of electric heating elements.
Smart Images
Figure CN224083726U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electric heating tube technology, and in particular to an antibacterial, anti-scaling, and corrosion-resistant electric heating tube. Background Technology
[0002] Traditional electric heaters typically use a metal tube as the outer shell, encapsulating a heating wire inside, with magnesium oxide powder, which has thermal conductivity and insulation properties, filling the space between the heating wire and the metal tube. When energized, the heat generated by the heating wire is conducted to the external water body through the magnesium oxide layer and the metal tube wall, completing the heating process. However, with prolonged use, the calcium and magnesium ions in the heated water combine with acid radicals to form insoluble precipitates, i.e., scale. This scale continuously adheres to the outer wall of the metal tube, forming a dense deposit. Because scale itself has extremely low thermal conductivity, heat is impeded at the metal tube wall, significantly reducing heat transfer efficiency and causing energy waste. Furthermore, uneven heating of the metal tube due to localized heat accumulation can occur. Specifically, the uneven distribution of the scale layer can cause thermal stress concentration on the tube surface, which, under long-term effects, can easily lead to safety hazards such as metal tube rupture or internal heating wire burnout, seriously affecting the equipment's lifespan and operational stability. Utility Model Content
[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes an antibacterial, anti-scaling, and corrosion-resistant electric heating tube.
[0004] This utility model embodiment provides an antibacterial, anti-scaling, and corrosion-resistant electric heating tube, the antibacterial, anti-scaling, and corrosion-resistant electric heating tube comprising:
[0005] The outer surface of the pipe body is provided with an antibacterial and anti-scaling coating, which is formed by the composite curing of a polymer matrix material and conductive metal particles.
[0006] A heating wire is disposed inside the tube, and a highly thermally conductive insulating layer is filled between the heating wire and the tube.
[0007] A sealing electrode is electrically connected to the heating wire and is fixedly installed in the tube body.
[0008] According to some embodiments of this utility model, the polymer matrix material is an organosilicon resin, and the conductive metal particles are silver paste particles.
[0009] According to some embodiments of this utility model, the shape of the tube body is a straight tube, a U-shaped tube, or a circular tube.
[0010] According to some embodiments of the present invention, the conductive metal particles are uniformly dispersed in the polymer matrix material in a three-dimensional network structure.
[0011] According to some embodiments of this utility model, the tube body is made of austenitic stainless steel, and the outer surface of the tube body is sandblasted to form a uniformly distributed array of pits, and the antibacterial and anti-scaling coating is embedded in the array of pits.
[0012] According to some embodiments of the present invention, the high thermal conductivity insulating layer includes a high-density magnesium oxide layer and a modified magnesium oxide layer, wherein the high-density magnesium oxide layer surrounds the heating wire, and the modified magnesium oxide layer surrounds the high-density magnesium oxide layer.
[0013] According to some embodiments of the present invention, the modified magnesium oxide layer is provided with a plurality of sheet-like thermally conductive fillers, and the plurality of sheet-like thermally conductive fillers are distributed along the axial direction of the tube body.
[0014] According to some embodiments of this utility model, the sheet-like thermally conductive filler is a boron nitride sheet.
[0015] According to some embodiments of the present invention, the sealed electrode includes an electrode core and a sealing sleeve. The electrode core is electrically connected to the heating wire. One end of the tube is fixedly connected to a flange. The sealing sleeve is fitted onto the electrode core and fixedly installed on the flange.
[0016] According to some embodiments of this utility model, the heating wire is a resistance wire or a carbon fiber heating wire.
[0017] The antibacterial, anti-scaling, and corrosion-resistant electric heating tube according to the embodiments of this utility model has at least the following technical effects:
[0018] 1. The antibacterial and anti-scaling coating is formed by the composite curing of a polymer matrix material and conductive metal particles. The polymer matrix material has excellent high-temperature resistance and chemical stability, enabling it to form a smooth and dense surface structure, reducing the adhesion points of calcium and magnesium ions in the water on the pipe wall, thereby inhibiting the initial deposition of scale. Secondly, the addition of conductive metal particles enhances the thermal conductivity of the coating, making the heat distribution more uniform and avoiding water hardening and scaling caused by excessively high local temperatures. In addition, the smooth surface of the antibacterial and anti-scaling coating makes it difficult for solid particles in the water (such as calcium carbonate and silicates) to directly contact the metal surface, thereby reducing scale adhesion.
[0019] 2. Silicone resin serves as the coating substrate, providing a heat-resistant framework and a hydrophobic surface. Silver paste particles can bind to the -SH groups of bacterial enzyme systems, blocking metabolism.
[0020] 3. The three-dimensional network structure improves the electrical and thermal conductivity of the metal particle-polymer composite coating through physical connectivity and electronic synergy, while also endowing the coating with long-lasting antibacterial and anti-scaling functions.
[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0023] Figure 1 This is a schematic diagram of the structure of the antibacterial, anti-scaling, and corrosion-resistant electric heating tube according to some embodiments of this utility model;
[0024] Figure 2 This is a schematic diagram of the structure of the antibacterial, anti-scaling, and corrosion-resistant electric heating tube according to some embodiments of this utility model;
[0025] Figure 3 This is a schematic diagram of the structure of an antibacterial, anti-scaling, and corrosion-resistant electric heating tube according to some embodiments of this utility model.
[0026] Icon labels:
[0027] Tube body 100; heating wire 110; sealing electrode 120; electrode core 121; sealing sleeve 122; flange 130; high-density magnesium oxide layer 140; modified magnesium oxide layer 150; sheet-like thermally conductive filler 160. Detailed Implementation
[0028] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0029] In the description of this utility model, it should be understood that the orientation descriptions, such as left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0030] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0031] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0032] The embodiments of this utility model will be further described below with reference to the accompanying drawings.
[0033] According to some embodiments of this utility model, refer to Figures 1 to 3 The antibacterial, anti-scaling, and corrosion-resistant electric heating tube includes a tube body 100, a heating wire 110, and a sealing electrode 120. The outer surface of the tube body 100 is coated with an antibacterial and anti-scaling layer, which is formed by the composite curing of a polymer matrix material and conductive metal particles. The heating wire 110 is disposed inside the tube body 100, and a highly thermally conductive insulating layer fills the space between the heating wire 110 and the tube body 100. The sealing electrode 120 is electrically connected to the heating wire 110 and is fixedly installed in the tube body 100. When the sealing electrode 120 is energized, the heating wire 110 heats up. The heat from the heating wire 110 is transferred through the highly thermally conductive insulating layer to the outer peripheral wall of the tube body 100, where heat exchange occurs between the outer peripheral wall of the tube body 100 and the liquid, thereby heating the liquid.
[0034] Understandably, the antibacterial and anti-scaling coating is formed by the composite curing of a polymer matrix material and conductive metal particles. The polymer matrix material has excellent high-temperature resistance and chemical stability, enabling it to form a smooth and dense surface structure, reducing the adhesion points of calcium and magnesium ions in the water on the pipe wall, thereby inhibiting the initial deposition of scale. Secondly, the addition of conductive metal particles enhances the thermal conductivity of the coating, making the heat distribution more uniform and avoiding water hardening and scaling caused by excessively high local temperatures. In addition, the smooth surface of the antibacterial and anti-scaling coating makes it difficult for solid particles in the water (such as calcium carbonate and silicates) to directly contact the metal surface, thereby reducing scale adhesion and providing corrosion resistance.
[0035] According to some embodiments of this invention, the polymer matrix material is organosilicon resin, and the conductive metal particles are silver paste particles. The conductive metal particles in the antibacterial and anti-scaling coating release trace amounts of metal ions, disrupting microbial cell membranes and interfering with the nucleation of calcium and magnesium ions, thus reducing the scale deposition rate by 60%-80% and achieving an inactivation rate of >99% for common bacteria such as E. coli. Furthermore, the three-dimensional network formed by the conductive metal particles increases the thermal conductivity of the antibacterial and anti-scaling coating to 1.5-2.5 W / m·K (compared to <0.5 W / m·K for traditional coatings), and combined with a high thermal conductivity insulation layer, improves the overall thermal efficiency by 25%-40%.
[0036] Preferably, the antibacterial and antiscaling coating comprises 70% silicone resin, 10% silver paste particles, 10% diluent, and 10% auxiliary agents. The silicone resin serves as the coating substrate, providing a heat-resistant framework and a hydrophobic surface. The silver paste particles can bind to the -SH groups of bacterial enzyme systems, blocking metabolism. The diluent is used to adjust the viscosity of the paste, ensuring uniform dispersion of the silver particles. The auxiliary agents include: scratch-resistant agents (such as nano-silica), which enhance the mechanical strength of the coating and prevent friction damage to the heating element; surfactants, which promote the dispersion of silver particles in the resin; and fungicide agents (such as benzimidazoles), which supplement the inhibitory effect of silver ions on fungi.
[0037] Understandably, the combination of silicone resin and silver paste particles achieves a dual antibacterial effect. The physical barrier of the silicone hydrophobic layer combines with the chemical bactericidal effect of silver ions, which reduces microbial adhesion and actively kills residual bacteria.
[0038] The process flow includes:
[0039] 1. Pretreatment of base pipe: The pipe body is made of austenitic stainless steel and is sandblasted (sand particle size 60-100 mesh) to form a rough surface with Ra=3-5μm;
[0040] 2. Coating preparation: Mix modified silicone resin (viscosity 1500-2500 cP) and silver paste particles (particle size 0.1-5 μm) at a ratio of 70:10, and add diluent (propylene glycol methyl ether acetate) to adjust to the spraying viscosity;
[0041] 3. Coating application: High-pressure airless spraying (pressure 15-25MPa) is used to apply the coating in two coats. After the first coat, pre-curing is carried out at 80℃ for 10 minutes. After the second coat, final curing is carried out at 150℃ for 30 minutes. The total thickness is controlled at 30-80μm.
[0042] 3. Insulation layer filling: After the heating wire 110 is positioned, magnesium oxide powder is filled in two stages using a vibration filling process (inner layer particle size ≤50μm, outer layer doped with 0.1-0.5% boron nitride), controlling the compaction density to ≥2.8g / cm³. 3 .
[0043] 4. Electrode sealing: The ends of the nickel-chromium alloy electrode posts and the tube body 100 are sealed by laser welding.
[0044] According to some embodiments of this utility model, the shape of the tube body 100 is a straight tube, a U-shaped tube, or a circular tube. It is understood that different shapes of tube bodies 100 are used according to different needs; the bending radius of the U-shaped tube is adjustable to adapt to compact installation space.
[0045] According to some embodiments of this invention, conductive metal particles are uniformly dispersed in a three-dimensional network structure within a polymer matrix material. It is understood that the three-dimensional network structure of the conductive metal particles refers to the interconnected, spatially continuous network topology formed by the metal particles in the polymer matrix material through a specific process. This structure establishes conductive / thermal pathways through physical contact or electron tunneling effects. The metal particles form a continuous network throughout the entire coating through point contact, line connection, or surface contact, with at least one conductive / thermal path composed of metal particles between any two points. Through physical connectivity and electronic synergy, the three-dimensional network structure increases the electrical conductivity of the metal particle-polymer composite coating by 2-3 orders of magnitude and the thermal conductivity by more than 10 times, while also endowing the coating with long-lasting antibacterial and anti-fouling functions. The conductive metal particles are fully and uniformly mixed within the polymer matrix material to form a three-dimensional network structure, thereby achieving conductive homogenization. The elastic modulus of the network structure is 40% lower than that of a dense coating, alleviating thermal expansion stress.
[0046] According to some embodiments of this utility model, the pipe body 100 is made of austenitic stainless steel. The outer surface of the pipe body 100 is sandblasted to form a uniformly distributed array of pits. An antibacterial and anti-scaling coating is embedded in the array of pits, thereby improving the bonding strength between the antibacterial and anti-scaling coating and the surface of the pipe body 100. Moreover, the edge turbulence effect of the pit array inhibits the growth of CaCO3 crystals and reduces scale.
[0047] According to some embodiments of this utility model, refer to Figure 3 The high thermal conductivity insulation layer includes a high-density magnesium oxide layer 140 and a modified magnesium oxide layer 150. The high-density magnesium oxide layer 140 surrounds the heating wire 110, and the modified magnesium oxide layer 150 surrounds the high-density magnesium oxide layer 140. The axis of the tube body 100 is in the left-right direction, and the heating wire 110 is located inside the tube body 100.
[0048] It should be noted that a high-density magnesium oxide layer 140 is formed by densely packing magnesium oxide particles through a high-compression tube process (such as cold pressing or hot pressing) to reduce porosity. This high-density magnesium oxide layer 140 is located adjacent to the heating wire 110. Its high packing density and low porosity create a tight heat-conducting network, rapidly transferring heat generated by the heating wire 110 to the outer layer, preventing localized overheating that could lead to oxidation or breakage of the heating wire 110. Furthermore, the coefficient of thermal expansion of magnesium oxide is similar to that of the heating wire 110 material, reducing the risk of displacement or breakage of the heating wire 110 due to expansion differences during thermal cycling. Simultaneously, the high-density magnesium oxide layer mechanically compacts the heating wire 110, preventing vibrations during processing or use from causing eccentricity or short circuits.
[0049] According to some embodiments of this utility model, refer to Figure 3The modified magnesium oxide layer 150 contains multiple sheet-like thermally conductive fillers 160, which are distributed along the axial direction of the tube body 100. The sheet-like thermally conductive fillers 160 are boron nitride sheets.
[0050] It should be noted that pure magnesium oxide exhibits decreased insulation performance at high temperatures due to enhanced electronic / ionic conductivity. The modified magnesium oxide layer 150 incorporates a high-temperature resistant filler, namely a sheet-like thermally conductive filler 160. In this embodiment, the sheet-like thermally conductive filler 160 is a boron nitride sheet, thereby suppressing high-temperature leakage current and maintaining insulation resistance stability. Furthermore, the sheet-like thermally conductive filler 160 is oriented axially along the tube body 100, utilizing its high in-plane thermal conductivity to form axially preferential heat conduction channels, reducing heat diffusion loss during radial transfer.
[0051] Understandably, heat is transferred sequentially from the heating wire 110, the high-density magnesium oxide layer 140, the modified magnesium oxide layer 150, and the outer wall of the tube body 100, thus forming a gradient heat conduction path. The high-density magnesium oxide layer 140 is responsible for homogenizing heat flow. As a basic functional layer, it undertakes the tasks of direct heat conduction, fixing the heating wire 110, and providing insulation at medium and low temperatures, achieving its performance through densification processes and crystal form optimization. The modified magnesium oxide layer 150, as a functional enhancement layer, improves high-temperature insulation, axial thermal conductivity, and environmental tolerance through filler doping and structural design. It focuses on addressing the inherent defects of pure magnesium oxide, such as moisture absorption and high-temperature degradation, by reducing thermal diffusion resistance through anisotropic fillers, thereby improving the overall thermal conductivity by 20%-50%. The dual-layer structure of the high-density magnesium oxide layer 140 and the modified magnesium oxide layer 150, through material gradient and functional division, balances the efficiency, lifespan, and safety of the heating tube, meeting the comprehensive requirements of high-end heating elements for "high thermal conductivity, high insulation, and resistance to extreme environments."
[0052] According to some embodiments of this utility model, refer to Figure 2 and Figure 3 The sealed electrode 120 includes an electrode core 121 and a sealing sleeve 122. The electrode core 121 is electrically connected to the heating wire 110. A flange 130 is fixedly connected to one end of the tube body 100. The sealing sleeve 122 is fitted onto the electrode core 121 and fixedly installed on the flange 130. The sealing sleeve 122 encloses the electrode core 121, forming an insulating barrier and preventing direct contact between the electrode core 121 and the external metal flange 130. Through the insulation of its material and structural design, the sealing sleeve 122 maintains the insulation state between the electrode and the external environment, avoiding equipment failure or electric shock risk caused by a short circuit between the electrode core 121 and the flange 130. The axis of the tube body 100 is in the left-right direction, and the heating wire 110 is located inside the tube body 100. The left end of the electrode core 121 passes through the sealing sleeve 122, and the right end of the electrode core 121 is connected to the heating wire 110.
[0053] According to some embodiments of this utility model, the heating wire 110 is a resistance wire or a carbon fiber heating wire. The heating wire 110 is made of carbon fiber, which can achieve ultra-fast response, has a heat capacity 60% lower than that of nickel-chromium wire, and can reach the set temperature within 0.5 seconds; moreover, it is resistant to extreme environments and can operate at temperatures >2000°C in a vacuum or inert atmosphere.
[0054] In this specification, the reference to the term "some embodiments" means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0055] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A type of antibacterial, anti-scaling, and corrosion-resistant electric heating tube, characterized in that, include: The outer surface of the tube body (100) is provided with an antibacterial and anti-scaling coating, which is formed by the composite curing of a polymer matrix material and conductive metal particles; Heating wire (110), the heating wire (110) is disposed inside the tube body (100), and a highly thermally conductive insulating layer is filled between the heating wire (110) and the tube body (100); A sealing electrode (120) is electrically connected to the heating wire (110) and is fixedly installed on the tube body (100).
2. The antibacterial, anti-scaling, and corrosion-resistant electric heating tube according to claim 1, characterized in that, The polymer matrix material is an organosilicon resin, and the conductive metal particles are silver paste particles.
3. The antibacterial, anti-scaling, and corrosion-resistant electric heating tube according to claim 1, characterized in that, The tube body (100) is in the shape of a straight tube, a U-shaped tube, or a circular tube.
4. The antibacterial, anti-scaling, and corrosion-resistant electric heating tube according to claim 1, characterized in that, The conductive metal particles are uniformly dispersed in the polymer matrix material in a three-dimensional network structure.
5. The antibacterial, anti-scaling, and corrosion-resistant electric heating tube according to claim 1, characterized in that, The tube body (100) is made of austenitic stainless steel. The outer surface of the tube body (100) is sandblasted to form a uniformly distributed array of pits. The antibacterial and anti-scaling coating is embedded in the array of pits.
6. The antibacterial, anti-scaling, and corrosion-resistant electric heating tube according to claim 1, characterized in that, The high thermal conductivity insulating layer includes a high-density magnesium oxide layer (140) and a modified magnesium oxide layer (150), the high-density magnesium oxide layer (140) surrounding the heating wire (110), and the modified magnesium oxide layer (150) surrounding the high-density magnesium oxide layer (140).
7. The antibacterial, anti-scaling, and corrosion-resistant electric heating tube according to claim 6, characterized in that, The modified magnesium oxide layer (150) is provided with a plurality of sheet-like thermally conductive fillers (160), and the plurality of sheet-like thermally conductive fillers (160) are distributed along the axial direction of the tube body (100).
8. The antibacterial, anti-scaling, and corrosion-resistant electric heating tube according to claim 7, characterized in that, The sheet-like thermally conductive filler (160) is a boron nitride sheet.
9. The antibacterial, anti-scaling, and corrosion-resistant electric heating tube according to claim 1, characterized in that, The sealed electrode (120) includes an electrode core (121) and a sealing sleeve (122). The electrode core (121) is electrically connected to the heating wire (110). One end of the tube (100) is fixedly connected to a flange (130). The sealing sleeve (122) is fitted onto the electrode core (121) and fixedly installed on the flange (130).
10. The antibacterial, anti-scaling, and corrosion-resistant electric heating tube according to claim 1, characterized in that, The heating wire (110) is a resistance wire or a carbon fiber heating wire.