CN117867954A - Bridge cable sheath and hydrophobic electrothermal anti-icing/deicing system - Google Patents
Bridge cable sheath and hydrophobic electrothermal anti-icing/deicing system Download PDFInfo
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- CN117867954A CN117867954A CN202311679047.0A CN202311679047A CN117867954A CN 117867954 A CN117867954 A CN 117867954A CN 202311679047 A CN202311679047 A CN 202311679047A CN 117867954 A CN117867954 A CN 117867954A
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- hydrophobic
- bridge cable
- layer
- icing
- cable sheath
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- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000012544 monitoring process Methods 0.000 claims description 12
- 238000012546 transfer Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims description 2
- 239000002270 dispersing agent Substances 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims description 2
- 229910000077 silane Inorganic materials 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 abstract description 16
- 239000011248 coating agent Substances 0.000 abstract description 15
- 238000005485 electric heating Methods 0.000 abstract description 14
- 239000007788 liquid Substances 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000001704 evaporation Methods 0.000 abstract description 2
- 230000005661 hydrophobic surface Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 22
- 238000012360 testing method Methods 0.000 description 12
- 229920001903 high density polyethylene Polymers 0.000 description 6
- 239000004700 high-density polyethylene Substances 0.000 description 6
- 239000004642 Polyimide Substances 0.000 description 5
- 229920001721 polyimide Polymers 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000003075 superhydrophobic effect Effects 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
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- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a bridge cable sheath and a hydrophobic electrothermal anti-icing/deicing system. According to the invention, due to the existence of the micro-nano structural protrusions on the hydrophobic surface, the solid-liquid contact surface is spaced, and the actual contact area between the liquid drop and the film is greatly reduced, so that the energy required for separating and evaporating the liquid drop from the surface of the hydrophobic electric heating film is greatly reduced under the condition of matched heating, the formation of ice coating can be effectively prevented, the falling off of the ice coating can be accelerated, and the electric energy loss is reduced.
Description
Technical Field
The invention belongs to the technical field of bridge cable anti-icing, and particularly relates to a bridge cable sheath and a hydrophobic electrothermal anti-icing/deicing system.
Background
Bridge cables are important components of bridge structures, bear the main load of the bridge, and the safety and durability of the bridge cables directly influence the service life and the operation efficiency of the bridge. The bridge cable sheath is a protective layer wrapped on the outer surface of the cable, and aims to prevent the cable from being corroded and damaged by the external environment and improve the durability and safety of the cable.
The bridge cable sheath is easy to be corroded by ice, snow and rainfall in a low-temperature environment, so that ice accumulation is formed on the surface of the cable, the weight and wind resistance of the cable are increased, the strength and rigidity of the cable are reduced, and even the cable is damaged. Active deicing modes such as thermal deicing, mechanical deicing and the like, which consume a large amount of energy and are not friendly to the environment. Hydrophobic coatings such as fluoroplastic and silicone rubber can prevent moisture from penetrating into the surface and reduce the adhesion of ice, but are effective only under wet snow conditions and cannot prevent freezing of supercooled water.
In summary, the existing anti-icing technology has certain limitations, such as large energy consumption, low efficiency, unfriendly environment, inconvenient operation, high cost and the like, and needs innovation and optimization to improve the performance and reliability of the anti-icing technology.
Disclosure of Invention
The invention aims to provide a sheath capable of effectively preventing or removing ice accumulation on the surface of a bridge cable, so that the safety and durability of the bridge cable are improved.
The technical scheme of the invention is as follows: a bridge cable sheath comprises a sheath body and is characterized in that the sheath body is covered with a layer of hydrophobic electrothermal film.
The sheath body of the bridge cable sheath is a basal layer prepared from high-density polyethylene (HDPE), polyvinyl chloride (PVC), polyurethane (PU), rubber or glass fiber and other materials.
The hydrophobic electrothermal film comprises an electric heating layer and a hydrophobic layer, and the hydrophobic layer covers the electric heating layer.
In order to ensure the safety of the bridge cable sheath and the safety of pedestrians and vehicles in the past, realize low-voltage and low-power heating to prevent (remove) ice, and realize the uniform distribution of the whole heating power on the surface of the bridge cable, the invention designs the electric heating layer as follows:
the electric heating layer comprises a heating and heat transfer layer formed by flexible conductive heat conducting materials such as carbon fiber, conductive polymer and the like, and conductive channels formed by copper wires or strip-shaped copper foils which are pressed on the heating and heat transfer layer at intervals in parallel, wherein one of the adjacent conductive channels is a high-potential channel, and the other is a low-potential channel; the heat generating and heat transferring layer has higher resistivity than the conductive channel, is made of semiconductor or high-resistance material, and has surface heating power density not less than 2W/cm 2 。
Through the design of the conductive channel, stable voltage can be provided in the longitudinal direction of the bridge cable sheath, uniform potential difference is formed at two ends of the heating and heat transfer area, uniform distribution of electric heating power is realized, and the change of the heating power density on the surface of the sheath caused by uneven resistance distribution or partial breakage of the electric heating layer is reduced as much as possible, so that the anti-icing or deicing effect and efficiency are finally influenced.
The hydrophobic layer is formed by spraying a hydrophobic agent, wherein the hydrophobic agent can be fluoride, silane or derivatives thereof, a certain amount of solvent and dispersing agent can be added to adjust the viscosity and stability of the coating, the uniformly mixed coating is coated on the electric heating layer, and the methods of knife coating, spraying, dip coating and the like can be adopted, but damage to the electric heating layer is avoided.
The thickness of the hydrophobic layer should be controlled between tens of micrometers and hundreds of micrometers to ensure that the electrical heating temperature rise can be rapidly applied to the surface. To ensure hydrophobicity, the coating surface contact angle should be no less than 110 °. In order to achieve a balance of heating power density and coating repellency, it is recommended to choose a hydrophobic coating with a contact angle of around 130 °.
The invention also provides a hydrophobic electrothermal anti-icing/deicing system, which comprises the bridge cable sheath, a power supply, a meteorological data on-line monitoring module, a sheath surface state on-line monitoring module and a controller, wherein the power supply is connected with the hydrophobic electrothermal film, the controller is respectively connected with the power supply, the meteorological data on-line monitoring module and the sheath surface state on-line monitoring module, acquires information such as real-time climate, bridge cable surface temperature and the like, and then controls the output power of the power supply.
And the positive electrode and the negative electrode of the power supply are respectively connected with the high potential channel and the low potential channel which are adjacent in the bridge cable sheath.
The beneficial effects are that:
1) Because of the existence of the micro-nano structure protrusions on the hydrophobic surface, the solid-liquid contact surface is spaced, and the actual contact area between the liquid drop and the film is greatly reduced, so that the energy required for separating and evaporating the liquid drop from the surface of the hydrophobic electrothermal film is greatly reduced under the condition of matched heating, the formation of ice coating can be effectively prevented, the falling off of the ice coating can be accelerated, and the electric energy loss is reduced.
2) The arrangement scheme of the conductive channel is beneficial to uniformly distributing the heating power density on the surface of the bridge cable sheath, reduces the requirement on the heating power supply voltage, and can realize effective deicing or ice coating prevention at 36-220V unlike the traditional high-power deicing device, thereby avoiding personal threat to bridge pedestrians or maintenance workers due to electric leakage faults and improving the safety of the system.
Drawings
FIG. 1 is a schematic illustration of the anti-icing/de-icing principle of a bridge cable sheath of the present invention;
FIG. 2 is a schematic illustration of the arrangement of conductive channels in a bridge cable jacket of the present invention;
FIG. 3 is a schematic diagram of a hydrophobic electrothermal ice protection/detachment system of the present invention;
FIG. 4 is a schematic illustration of an artificial icing test arrangement;
FIG. 5 is a graph showing the results of the artificial icing test.
Detailed Description
The present invention will be described in detail with reference to the following examples and the accompanying drawings to help those skilled in the art to better understand the inventive concept of the present invention, but the scope of the claims of the present invention is not limited to the following examples, and it should be understood that those skilled in the art should not make any other examples without departing from the inventive concept of the present invention. In the present invention "/" means "or" meaning.
The following uses a High Density Polyethylene (HDPE) bridge cable sheath body as a test sample, a heating film of polyimide pressed copper wire as an electrical heating layer, and a hydrophobic coating is coated on the surface to form a hydrophobic layer, as shown in fig. 1.
And pressing the polyimide heating film on the surface of the HDPE sheath body to serve as a heating and heat transfer layer, and then pressing copper wires with parallel intervals on the polyimide heating film to serve as conductive channels, wherein when the polyimide heating film is electrified, the adjacent conductive channels are respectively connected with the positive and negative stages of a power supply, polyimide between the conductive channels heats under the action of a potential difference to form an electric heating layer. The fluorine-based resin is coated on the surface of the electric heating layer to serve as a hydrophobic layer, and the contact angle of the surface is about 130 degrees.
In order to compare the difference of pure electric heating and electric heating anti-icing effects of the hydrophobic electric heating film, the surface part of the sample is not sprayed with a hydrophobic coating, and in addition, a cable sheath with a pure super-hydrophobic surface and a cable sheath without an anti-icing structure is arranged for comparison.
According to the situation that the stay cable bridge is frozen, an artificial icing test is adopted to test the anti-icing performance.
The main equipment adopted in the manual icing experiment is a high-low temperature test box, and the test device is arranged as shown in figure 4. According to the design of the sample test frame according to the length and the radius of the HDPE protective sleeve, a sample is fixed on the main beam structure through oblique angle installation, and the fixing angle is adjustable.
The test scheme is used for simulating rime coverage in natural environment by means of low-temperature spraying supercooled water by referring to the electric power industry standard DLT 1247-2013-high-voltage direct-current insulator icing flashover test methodSetting the temperature of the indoor environment of the climate at-5 to-4 ℃ under ice condition, supercooling water drops during spraying, controlling the average particle diameter of the water drops to be about 80 mu m and the spraying flow to be 80-100L/h.m 2 In the icing process, the indoor fan of the climate chamber is intermittently started and generates circulating wind of 1-12 m/s.
Fig. 5 shows the result of different bridge cable sheaths after ice-coating in a climatic chamber.
The test results show that: 1) Under the same icing condition and icing time, compared with an untreated bridge cable sheath and a bridge cable sheath treated by a super-hydrophobic coating, the surface of the hydrophobic electrothermal film can better prevent the formation of surface icing, and test results are shown as a, b and c in fig. 5;
2) The hydrophobic electrothermal film exhibits a remarkable anti-icing effect with respect to the pure heat and untreated surface at the same heating power. When the surface heating temperature of the hydrophobic electrothermal film is set to be 0 ℃, the surface water drops can be prevented from being frozen to form ice coating, and d in fig. 5 is shown.
Fig. 3 is a schematic diagram of a hydrophobic electrothermal anti-icing/deicing system constructed by the invention, which comprises the bridge cable sheath, a power supply, a weather data online monitoring module, a sheath surface state online monitoring module and a control terminal, wherein the positive electrode and the negative electrode of the power supply are respectively connected with an adjacent high-potential channel and low-potential channel in the bridge cable sheath, the control terminal is respectively connected with the power supply, the weather data online monitoring module and the sheath surface state online monitoring module to acquire information such as real-time weather, bridge cable surface temperature and the like, and then the output power of the power supply is controlled, so that intelligent anti-icing/deicing can be performed according to weather conditions or actual states of the sheath surface.
The anti-icing technology for the bridge cable sheath has important significance and value for guaranteeing the normal operation of the bridge cable and improving the safety and durability of the bridge.
In addition, it should be noted that the present invention is not limited to the above-mentioned embodiments, and according to the above-mentioned general knowledge and conventional means in the art, the present invention can be modified, replaced or changed in various equivalent ways without departing from the basic technical idea of the present invention, and all the modifications are included in the scope of the present invention.
Claims (8)
1. A bridge cable sheath comprises a sheath body and is characterized in that the sheath body is covered with a layer of hydrophobic electrothermal film.
2. The bridge cable sheath of claim 1, wherein the hydrophobic electrothermal film comprises an electrically heated layer and a hydrophobic layer, the hydrophobic layer overlying the electrically heated layer.
3. The bridge cable sheath of claim 2, wherein the electrically heated layer comprises a heat generating and heat transfer layer of flexible electrically and thermally conductive material, and wire-shaped electrically conductive channels pressed in parallel and spaced relation above the heat generating and heat transfer layer, one of the adjacent electrically conductive channels being a high potential channel and the other being a low potential channel; the heat generating and heat transferring layer has higher resistivity than the conductive channel, is made of semiconductor or high-resistance material, and has surface heating power density not less than 2W/cm 2 。
4. A bridge cable sheath according to claim 3 wherein the hydrophobic layer is sprayed with a hydrophobic agent, the hydrophobic agent being fluoride, silane or a derivative thereof, or further adding a quantity of solvent and dispersant.
5. The bridge cable jacket of claim 4, wherein the hydrophobic layer has a thickness between tens of micrometers and hundreds of micrometers.
6. The bridge cable sheath of claim 5, wherein the hydrophobic layer surface contact angle is no less than 110 °, and the recommended contact angle is 130 °.
7. The hydrophobic electrothermal anti-icing/deicing system is characterized by comprising any one of the bridge cable jackets and a power supply according to claims 1-6, wherein the power supply is connected with a hydrophobic electrothermal film of the Liang Lansuo jacket, and the hydrophobic electrothermal anti-icing/deicing system further comprises a meteorological data on-line monitoring module, a jacket surface state on-line monitoring module and a controller, wherein the controller is respectively connected with the power supply, the meteorological data on-line monitoring module and the jacket surface state on-line monitoring module to acquire information such as real-time climate, bridge cable surface temperature and the like, and then controls the output power of the power supply.
8. The hydrophobic electrothermal ice protection/removal system of claim 7, wherein the positive and negative poles of the power source are connected to adjacent high and low potential channels in the bridge cable jacket, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311679047.0A CN117867954A (en) | 2023-12-08 | 2023-12-08 | Bridge cable sheath and hydrophobic electrothermal anti-icing/deicing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311679047.0A CN117867954A (en) | 2023-12-08 | 2023-12-08 | Bridge cable sheath and hydrophobic electrothermal anti-icing/deicing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117867954A true CN117867954A (en) | 2024-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311679047.0A Pending CN117867954A (en) | 2023-12-08 | 2023-12-08 | Bridge cable sheath and hydrophobic electrothermal anti-icing/deicing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117867954A (en) |
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2023
- 2023-12-08 CN CN202311679047.0A patent/CN117867954A/en active Pending
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