CN112096577A - Fan blade defroster - Google Patents
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- CN112096577A CN112096577A CN202010896280.4A CN202010896280A CN112096577A CN 112096577 A CN112096577 A CN 112096577A CN 202010896280 A CN202010896280 A CN 202010896280A CN 112096577 A CN112096577 A CN 112096577A
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- 239000000919 ceramic Substances 0.000 claims abstract description 51
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 238000012544 monitoring process Methods 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 239000011248 coating agent Substances 0.000 claims abstract description 21
- 238000000576 coating method Methods 0.000 claims abstract description 21
- 230000003075 superhydrophobic effect Effects 0.000 claims abstract description 14
- 238000005485 electric heating Methods 0.000 claims description 20
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- 238000005265 energy consumption Methods 0.000 abstract description 8
- 238000010248 power generation Methods 0.000 description 6
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- 230000005611 electricity Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 208000025274 Lightning injury Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
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- 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
- 229920000728 polyester Polymers 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/40—Ice detection; De-icing means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/60—Cooling or heating of wind motors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention relates to a fan blade deicing device. The invention comprises a deicing system control cabinet, an external sensing detection device, a ceramic electrothermal film and a nano super-hydrophobic coating coated on the outer surface of a fan blade; the external sensing detection device is connected with the deicing system control cabinet; the fan blade is divided into a plurality of monitoring areas from the blade root to the blade tip in sequence, the outer parts of the monitoring areas divided on the fan blade are respectively provided with an icing sensor, each monitoring area is divided into independent heating plate areas of a blade front wing surface, a front edge hot knife and a blade rear wing surface, a ceramic electrothermal film is arranged in each heating plate area, and a deicing system control cabinet is connected with the ceramic electrothermal film; and a temperature sensor is arranged outside the fan blade tip. The invention can realize high-efficiency deicing of key areas, not only greatly reduces unnecessary energy consumption of non-icing areas, but also improves deicing efficiency, and is more efficient and energy-saving as a whole.
Description
Technical Field
The invention relates to a fan blade deicing device, and belongs to the technical field of wind power generation.
Background
The world is continuously developing, the demand on energy is continuously increased, wind energy is taken as a renewable energy source with huge potential, the wind energy is highly valued by governments of various countries, and the investment is continuously increased.
The wind power generation is that wind power is used for driving a fan blade to rotate, and then a speed-up gear box is used for driving a high-speed shaft to rotate, so that a wind driven generator is promoted to generate electricity. Wind power generation is a clean and efficient power generation mode, however, wind power generators are generally erected in cold regions or high-altitude regions, and are subjected to high and cold external environments during winter running. One of the important challenges is icing of the fan blades.
The icing of the wind power blade can reduce the airfoil lift force and increase the resistance, so that the torque of the blade is reduced, and the generating efficiency of the fan is influenced. Meanwhile, due to the increase of ice coating, the mass distribution of the blades is unbalanced, asymmetric load is generated, and mechanical failure and even shutdown are caused. Therefore, the method has great practical significance for the research of the anti-icing and deicing technology of the wind driven generator blade.
The existing wind power generation blade deicing system is characterized in that: the air blower principle invented by the American general electric company in the past adopts an air blowing device to blow air, an industrial heater is arranged at an air outlet of the air blowing device to heat, and heat generated by the industrial heater is circulated in blades in a hot air mode through the air blowing device, so that hot air circulation heat transfer deicing is realized. This approach not only consumes much energy due to inefficient heat transfer, but also the heavier blower increases the load on the blade operation. The method is also invented by Danish Wistoss wind power company and adopts a deicing method after the wind driven generator is shut down, the blade is accelerated and decelerated to form impact through a blade variable pitch motor to shake off the ice on the blade, and the method has huge damage to a hub and also has ultrasonic deicing, electric pulse deicing and the like.
At present, a complete blade deicing control device is not available. The problem of fan icing has seriously hindered the development of the wind power industry at home and abroad. Therefore, the icing law and the influence factors of the fan blades are researched, and reasonable and efficient fan icing-preventing and deicing means are urgently found.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a fan blade deicing device which is used for overcoming the defects of low efficiency, high energy consumption, difficulty in maintenance and the like of the conventional wind power plant blade deicing method.
The technical scheme of the invention is as follows: a fan blade deicing device comprises a deicing system control cabinet, an external sensing detection device, a ceramic electrothermal film 3 and a nanometer super-hydrophobic coating 1 coated on the outer surface of a fan blade;
the external sensing detection device comprises an icing sensor and a temperature sensor, and is connected with the deicing system control cabinet; the fan blade is divided into a plurality of monitoring areas from the blade root to the blade tip in sequence, the outer parts of the monitoring areas divided on the fan blade are respectively provided with an icing sensor for monitoring the icing condition of each divided area on the fan blade in real time and feeding the icing condition back to a deicing system control cabinet, each monitoring area is also divided into independent heating plate areas of a blade front wing surface 12, a front edge hot knife 13 and a blade rear wing surface 14, a ceramic electrothermal film 3 is arranged in each heating plate area, and the deicing system control cabinet is connected with the ceramic electrothermal film 3; and a temperature sensor 8 is arranged outside the blade tip of the fan and used for monitoring the external temperature condition in real time and feeding back the external temperature condition to the deicing system control cabinet.
As a further scheme of the invention, the fan blade is sequentially divided into an electric heating film area I5, an electric heating film area II 6 and an electric heating film area III 7 from the blade root to the blade tip, and an icing sensor I9, an icing sensor II 10 and an icing sensor III 11 are respectively arranged outside the electric heating film area I5, the electric heating film area II 6 and the electric heating film area III 7; the icing sensor I9, the icing sensor II 10 and the icing sensor III 11 are blade icing sensors Model9734-SYSTEM, and the temperature sensor 8 is a PT100 external temperature sensor.
As a further scheme of the invention, a glass fiber layer 2 is additionally arranged between a ceramic electrothermal film 3 and a nano super-hydrophobic coating 1 which are arranged in each monitoring area in a partition mode, and a heat insulation layer 4 is arranged on the innermost layer of the fan blade.
As a further scheme of the invention, a PLC (programmable logic controller) is adopted in the deicing system control cabinet.
As a further scheme of the invention, the thickness of the ceramic electrothermal film 3 arranged in each heating plate area is different, and the ceramic electrothermal film 3 arranged from the blade root to the blade tip has different thickness from thin to thick according to the ice coating quality and the actual situation that the ice coating thickness is gradually increased from the blade root to the blade tip.
As a further scheme of the invention, the deicing system control cabinet is arranged at the bottom of the tower barrel, receives monitoring data of an external sensing detection device, transmits control electric signals of different areas to corresponding monitoring areas of the fan blades through electric pulleys in the hub, and controls the ceramic electrothermal films 3 which are arranged in the corresponding monitoring areas of the fan blades in different working modes.
As a further scheme of the invention, the ceramic electrothermal film 3 is controlled in different working modes, including three different modes of non-working mode, anti-icing mode and deicing mode;
the modes of non-operation are: when the external temperature monitored by the external sensing detection device is higher than 0 ℃, the ceramic electrothermal film 3 of the anti-icing system does not work, the external sensing detection device works, and the feedback information and the temperature information of the external icing sensor are monitored and fed back in real time;
the anti-icing mode is as follows: when the external temperature monitored by the external sensing detection device is less than or equal to 0 ℃, the feedback information of the icing sensor of each divided area indicates that the blades of each area on the fan blade are not iced at present, and the deicing system control cabinet controls the ceramic electrothermal films 3 of each area to work so that the temperature is maintained at 0 ℃;
the deicing mode is as follows: when the external temperature monitored by the external sensing detection device is less than or equal to 0 ℃, and the feedback information of the icing sensor in each divided area indicates that the icing phenomenon occurs in a certain area on the current fan blade, the PLC in the deicing system control cabinet controls the ceramic electrothermal film 3 in the icing area to work so as to perform the cyclic electric heating deicing for 4s, 7s and 4s on the front blade airfoil 12, the front edge hot knife 13 and the rear blade airfoil 14 respectively.
The invention is composed of 3 icing sensors (Model 9734-SYSTEM) and a temperature sensor (PT100) for detecting the external temperature; the three-dimensional deicing system is characterized in that the three (3) icing sensors are respectively arranged outside the divided areas and used for monitoring the icing condition of the three (3) divided areas on the blade, monitoring data are fed back to the deicing system control cabinet by combining temperature information monitored by the PT100 temperature sensor outside the blade tip, so that the control modes of the divided areas are selected (non-action mode, anti-icing mode and deicing mode), and if the deicing mode is adopted for the icing areas, the PLC is used for controlling and realizing the cyclic timing deicing of the front blade surface 12, the front edge hot knife 13 and the rear blade surface 14 of the blade in the icing areas.
The PLC has advanced anti-interference capability, the average fault-free time of the PLC is usually more than 20000 hours, the PLC cannot be used by other common electrical equipment, the applicability to severe industrial environment is strong, the maintenance workload is small, the maintenance is convenient, and the PLC is very suitable for the wind driven generator working in the outdoor severe environment.
The ceramic electrothermal film improves the thermal efficiency compared with heating elements such as resistance wires and the like, is a microcosmic grid type conductive channel, can finish surface-shaped heating on a curved surface or any concave-convex surface, and has the advantages of high thermal efficiency, energy and electricity conservation, long service life, low cost, no open fire, safety and reliability, and is not easy to damage. And the ice is concentrated at the blade tip according to the blade icing; the blade root is less iced and is not greatly influenced by environmental factors; the actual situation that the icing quality and the icing thickness are gradually increased from the blade root to the blade tip is achieved, so that the ceramic electrothermal films 3 arranged in the electrothermal film area I5, the electrothermal film area II 6 and the electrothermal film area III 7 have different thicknesses, the temperature of the blade tip easy to freeze is increased more quickly, the deicing efficiency is improved, and the energy consumption of the whole deicing system is reduced. And because the characteristic that the windward front edge is easy to cover ice divides the electrothermal films in the electrothermal film area I5, the electrothermal film area II 6 and the electrothermal film area III 7 into a front area, a middle area and a rear area so as to realize the circulating timing deicing of the PLC and improve the deicing efficiency.
The invention has the beneficial effects that:
1. the ceramic electrothermal film is used for heating, surface-shaped heating can be completed on a curved surface or any concave-convex surface, the thermal efficiency is high, energy and electricity are saved, the service life is long, the blade is not easy to damage, the cost is low, open fire is avoided, safety and reliability are realized, and the ceramic electrothermal film has different thicknesses from the blade root to the blade tip, so that the temperature of the blade tip easy to freeze is increased more quickly, the deicing efficiency is improved, and the energy consumption of the whole deicing system is reduced;
2. according to the invention, the nanometer super-hydrophobic coating is coated on the surface of the fan blade, so that the water drop loss can be greatly promoted, the freezing probability of the water drop is reduced, the icing is further delayed, the icing threshold is improved, the electric heating deicing frequency can be effectively reduced, and the effect of reducing the overall energy consumption of a deicing system is achieved;
3. the invention is applied to the areas where the fan blades are easy to freeze, reduces the damage of the blades and improves the power generation efficiency of the fan in a main and passive deicing mode;
4. the invention can realize high-efficiency deicing of key areas, not only greatly reduces unnecessary energy consumption of non-icing areas, but also improves deicing efficiency, and is more efficient and energy-saving as a whole.
Drawings
FIG. 1 is an airfoil elevation view of a fan blade provided in accordance with an example of the present invention;
FIG. 2 is an airfoil rear view of a fan blade provided in accordance with an example of the present invention;
FIG. 3 is a side sectional view of a fan blade according to an embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3 of the present invention;
FIG. 5 is a block diagram of an anti-icing control system of the present invention;
FIG. 6 is a flowchart of the anti-icing and deicing system process of the present invention;
fig. 7 is a PLC ladder diagram of the deicing mode of the present invention.
The various reference numbers in FIGS. 1-7: the device comprises a 1-nanometer super-hydrophobic coating, a 2-glass fiber layer, a 3-ceramic electrothermal film, a 4-thermal insulation layer, a 5-electrothermal film area I, a 6-electrothermal film area II, a 7-electrothermal film area III, a 8-temperature sensor, a 9-icing sensor I, a 10-icing sensor II, a 11-icing sensor III, a 12-blade front wing surface, a 13-leading edge hot knife and a 14-blade rear wing surface.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Example 1: as shown in fig. 1-7, a fan blade deicing device comprises a deicing system control cabinet, an external sensing detection device, a ceramic electrothermal film 3 and a nano super-hydrophobic coating 1 coated on the outer surface of a fan blade; a PLC controller is adopted in the deicing system control cabinet, the external sensing detection device comprises an icing sensor and a temperature sensor, and the external sensing detection device is connected with the deicing system control cabinet; the fan blade is divided into an electrothermal film area I5, an electrothermal film area II 6 and an electrothermal film area III 7 in sequence from the blade root to the blade tip, the outer parts of the electrothermal film area I5, the electrothermal film area II 6 and the electrothermal film area III 7 are respectively provided with an icing sensor I9, an icing sensor II 10 and an icing sensor III 11 which are used for monitoring the icing condition of each divided area on the fan blade in real time and feeding the icing condition back to a deicing system control cabinet, each monitoring area is also divided into independent heating plate areas of a blade front wing surface 12, a front edge hot knife 13 and a blade rear wing surface 14, each heating plate area is internally provided with a ceramic electrothermal film 3, an electrothermal film glass fiber layer 2 is additionally arranged between the ceramic electrothermal film 3 and a nano super-hydrophobic coating 1 which are arranged in each monitoring area, the innermost layer of the fan blade is a heat insulation layer 4, and the deicing system; a temperature sensor 8 is arranged outside the fan blade tip and used for monitoring the external temperature condition in real time and feeding back the external temperature condition to a deicing SYSTEM control cabinet, blade icing sensors Model9734-SYSTEM are adopted for an icing sensor I9, an icing sensor II 10 and an icing sensor III 11, and a PT100 external temperature sensor is adopted for the temperature sensor 8.
As a further scheme of the invention, the thickness of the ceramic electrothermal film 3 arranged in each heating plate area is different, and the ceramic electrothermal film 3 arranged from the blade root to the blade tip has different thickness from thin to thick according to the ice coating quality and the actual situation that the ice coating thickness is gradually increased from the blade root to the blade tip.
As a further scheme of the invention, the deicing system control cabinet is arranged at the bottom of the tower barrel, receives monitoring data of an external sensing detection device, transmits control electric signals of different areas to corresponding monitoring areas of the fan blades through electric pulleys in the hub, and controls the ceramic electrothermal films 3 which are arranged in the corresponding monitoring areas of the fan blades in different working modes.
As a further scheme of the invention, the ceramic electrothermal film 3 is controlled in different working modes, including three different modes of non-working mode, anti-icing mode and deicing mode;
the modes of non-operation are: when the external temperature monitored by the external sensing detection device is higher than 0 ℃, the ceramic electrothermal film 3 of the anti-icing system does not work, the external sensing detection device works, and the feedback information and the temperature information of the external icing sensor are monitored and fed back in real time;
the anti-icing mode is as follows: when the external temperature monitored by the external sensing detection device is less than or equal to 0 ℃, the feedback information of the icing sensor of each divided area indicates that the blades of each area on the fan blade are not iced at present, and the deicing system control cabinet controls the ceramic electrothermal films 3 of each area to work so that the temperature is maintained at 0 ℃;
the deicing mode is as follows: when the external temperature monitored by the external sensing detection device is less than or equal to 0 ℃, and the feedback information of the icing sensor in each divided area indicates that the icing phenomenon occurs in a certain area on the current fan blade, the PLC in the deicing system control cabinet controls the ceramic electrothermal film 3 in the icing area to work so as to perform the cyclic electric heating deicing for 4s, 7s and 4s on the front blade airfoil 12, the front edge hot knife 13 and the rear blade airfoil 14 respectively.
The working principle of the invention is as follows:
the invention comprises a passive deicing mode of using a nano super-hydrophobic coating 1 on the outer surface of the fan blade and an active deicing mode of adopting a PLC (programmable logic controller) controlled partition ceramic electrothermal film 3 to perform electric heating; the active deicing mode comprises two working modes of anti-icing and deicing;
the control principle of the anti-icing mode in the active deicing is as follows: when the temperature sensor arranged outside the blade tip in the external sensing detection device detects that the external environment temperature is less than or equal to 0 ℃, but the feedback information of the icing sensors in the electrothermal film area I5, the electrothermal film area II 6 and the electrothermal film area III 7 all indicate that the fan blade is not iced, the PLC controls the ceramic electrothermal films 3 in the areas to work so that the temperature is maintained at 0 ℃.
The control principle of the deicing mode in the active deicing is as follows: when a temperature sensor arranged outside the blade tip in the external sensing detection device detects that the external environment temperature is less than or equal to 0 ℃, and the feedback information of the icing sensors in the electric heating film area I5, the electric heating film area II 6 and the electric heating film area III 7 indicates that the icing phenomenon occurs in a certain area on the fan blade, the PLC controls the ceramic electric heating film 3 in the icing area to work in an deicing mode, and the non-icing area still works in an anti-icing mode to maintain the temperature at 0 ℃.
In the deicing mode, the PLC controls the icing area to perform 4s, 4s and 7s of cyclic electric heating deicing on the front blade surface 12, the rear blade surface 14 and the leading edge hot knife 13 of the blade respectively.
According to the invention, under the condition that the external temperature sensor monitors that the external environment temperature is higher than 0 ℃ and the feedback information of the icing sensors in all areas indicates that the blades are not iced, the whole anti-icing and deicing system is closed, and only the external sensing detection device is left to perform real-time feedback on the external information.
The active deicing mode can have lightning stroke risks, so the lightning protection device of the blade with the blade tip damper is adopted, the whole blade is divided into two sections, the blade tip part is prefabricated with an aluminum core on a glass fiber polyester layer to serve as a lightning receptor, and a damper shaft made of carbon fiber materials is connected with a blade tip damper starting steel wire (the starting steel wire and the hub are grounded) connected with the hub. Thereby eliminating the risk of lightning strikes.
The ceramic electrothermal film 3 of the electrothermal film region I5, the electrothermal film region II 6 and the electrothermal film region III 7 has different thicknesses, and because the blade tip part is more easily frozen relative to the blade root part in the wind turbine generator, when the blade is arranged, the thickness of the ceramic electrothermal film can be 0.1mm, 0.15mm and 0.2mm in sequence according to the electrothermal film region I5, the electrothermal film region II 6 and the electrothermal film region III 7. Thus, the temperature in the region where the blade tip is more prone to icing is increased more quickly, and the overall deicing efficiency is improved.
According to the invention, the first defense line of the blade icing threshold is improved by arranging the external nano super-hydrophobic coating, after icing is carried out, the icing area is locked according to the feedback of the icing sensors in different areas, the PLC controls the icing area to carry out the second defense line for carrying out timed and cyclic deicing on the windward front edge, the middle beam and the leeward rear edge of the blade, the icing possibility is reduced by the first defense line, the icing conditions of different areas are different from those of the second defense line, different modes (deicing and anti-icing) can be adopted according to the reality, the efficient deicing of key areas is realized, the unnecessary energy consumption of non-icing areas is greatly reduced, the deicing efficiency is improved, and the whole system is more efficient and energy-saving. By adopting the technical scheme in the embodiment of the invention, a good deicing effect can be achieved on the premise of greatly reducing energy consumption.
The PLC of the deicing system control cabinet selects different modes such as a non-working mode, an anti-icing mode and a deicing mode according to the regional icing condition and the temperature condition fed back by the external sensing detection device;
if the first region is switched to the deicing mode, the front blade wing surface 12, the front edge hot knife 13 and the rear blade wing surface 14 of the region are controlled by a PLC to carry out a timing cycle heating mode of the heating sheet region (the front and rear blade wing surfaces of the blade are heated for 4 seconds at the same time and then switched to the front edge hot knife for heating for 7 seconds, and then switched to the front and rear wing surfaces for heating after heating for 7 seconds, and then repeatedly circulated), and the three sheet regions are repeatedly and circularly heated until no icing phenomenon is fed back by an icing sensor in the icing region, and the cycle heating is stopped, so that the deicing mode is finished.
Referring to fig. 3, fig. 3 is a side sectional view of a fan blade, which can better explain the position relationship of the front airfoil surface 12, the leading edge hot knife 13 and the rear airfoil surface 14 of the blade.
Referring to fig. 4, fig. 4 is a partial enlarged view of a side section of a fan blade, as shown in the figure, the fan blade mainly comprises a nano super-hydrophobic coating 1, a glass fiber layer 2, a ceramic electrothermal film 3 and a heat insulation layer 4.
The outermost layer of the blade is a nano super-hydrophobic coating 1 which is a passive anti-icing and deicing means so as to improve the icing condition of the blade, and then a glass fiber layer 2 is additionally arranged on a ceramic electrothermal film 3 and the nano super-hydrophobic coating 1 which are arranged in a subarea manner, so that the strength of the blade is improved while the effects of heat preservation, water resistance and the like are achieved.
Referring to fig. 5, fig. 5 is a block diagram of an anti-icing control system, information is fed back to an anti-icing control cabinet (i.e., an anti-icing system control cabinet) at the bottom region of a tower drum through an icing sensor and an external temperature sensor in each region, and a PLC of the anti-icing control cabinet controls the working state (non-working, anti-icing mode, and deicing mode) of a ceramic electrothermal film in each region.
Please refer to fig. 6 for the principle of the deicing system control cabinet controlling the working state of the ceramic electrothermal films in each region, and fig. 7 is a flow chart of the deicing system program of the embodiment of the present invention.
The external sensing detection device carries out real-time monitoring for 24 hours, firstly, according to whether the fed-back external temperature is greater than 0 ℃, if the external temperature is greater than 0 ℃, the anti-icing system does not act, the whole anti-icing system is closed, and only the external detection unit (namely the external sensing detection device) is left for carrying out real-time feedback on external information.
If the fed back external environment temperature is less than or equal to 0 ℃, but the feedback information of the icing sensors in the first area, the second area and the third area indicates that the blades in each area are not iced at present, the system deicing control cabinet controls the ceramic electric heating films in each area to work in an anti-icing mode so that the temperature is maintained at 0 ℃.
When the external temperature sensor detects that the external environment temperature is less than or equal to 0 ℃, and the first, second and third areas are fed back by the icing sensor, and an icing phenomenon occurs in a certain area on the fan blade, the deicing system control cabinet controls the ceramic electrothermal film in the icing area to switch to a deicing mode (area timing cycle heating deicing) to work, and the non-icing area still works in the anti-icing mode to maintain the temperature at 0 ℃.
The deicing mode is that the PLC controls the icing area to perform 4s, 7s and 4s of cyclic electric heating deicing on the front blade surface 12, the front edge hot knife 13 and the rear blade surface 14 of the blade respectively. Referring to fig. 7, fig. 7 is a timing cycle deicing PLC ladder diagram of a deicing mode. When an I0.0 is pressed down, a deicing mode is started, Q0.1 is switched on, namely a hot knife at the windward front edge of a certain icing area is electrified and heated for 7s, Q0.1 is switched off after 7s, Q0.2 and Q0.3 are switched on, namely the front wing surface and the rear wing surface of a blade are electrified and heated for 4s, Q0.1 is switched off after 4s, the operation is repeated until no icing phenomenon is fed back by an icing sensor, and the I0.1 is closed, and the deicing mode of the area is switched off.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes and modifications can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (7)
1. A fan blade defroster which characterized in that: the deicing system comprises a deicing system control cabinet, an external sensing detection device, a ceramic electrothermal film (3) and a nano super-hydrophobic coating (1) coated on the outer surface of a fan blade;
the external sensing detection device comprises an icing sensor and a temperature sensor, and is connected with the deicing system control cabinet; the fan blade is divided into a plurality of monitoring areas from the blade root to the blade tip in sequence, the outer parts of the monitoring areas divided on the fan blade are respectively provided with an icing sensor for monitoring the icing condition of each divided area on the fan blade in real time and feeding the icing condition back to a deicing system control cabinet, each monitoring area is also divided into independent heating plate areas of a blade front wing surface (12), a front edge hot knife (13) and a blade rear wing surface (14), a ceramic electrothermal film (3) is arranged in each heating plate area, and the deicing system control cabinet is connected with the ceramic electrothermal film (3); and a temperature sensor (8) is arranged outside the blade tip of the fan and used for monitoring the external temperature condition in real time and feeding back the external temperature condition to the deicing system control cabinet.
2. Fan blade de-icing arrangement according to claim 1, characterized in that: the fan blade is sequentially divided into an electrothermal film area I (5), an electrothermal film area II (6) and an electrothermal film area III (7) from the blade root to the blade tip, and an icing sensor I (9), an icing sensor II (10) and an icing sensor III (11) are respectively arranged outside the electrothermal film area I (5), the electrothermal film area II (6) and the electrothermal film area III (7); icing sensors I (9), II (10) and III (11) are blade icing sensors Model9734-SYSTEM, and temperature sensors (8) are PT100 external temperature sensors.
3. Fan blade de-icing arrangement according to claim 1, characterized in that: a glass fiber layer (2) is additionally arranged between the ceramic electrothermal film (3) and the nano super-hydrophobic coating (1) which are arranged in each monitoring area in a partition mode, and the innermost layer of the fan blade is a heat insulation layer (4).
4. Fan blade de-icing arrangement according to claim 1, characterized in that: and a PLC (programmable logic controller) is adopted in the deicing system control cabinet.
5. Fan blade de-icing arrangement according to claim 1, characterized in that: the thickness of the ceramic electrothermal film (3) arranged in each heating plate area is different, and the ceramic electrothermal film (3) arranged from the blade root to the blade tip has different thicknesses from thin to thick according to the actual conditions that the ice coating quality and the ice coating thickness are gradually increased.
6. Fan blade de-icing arrangement according to claim 1, characterized in that: the deicing system control cabinet is installed at the bottom of the tower barrel, receives monitoring data of the external sensing detection device, transmits control electric signals of different areas to corresponding monitoring areas of the fan blades through electric pulleys in the hub, and controls ceramic electric heating films (3) which are arranged in the corresponding monitoring areas of the fan blades in different working modes in a partitioning mode.
7. Fan blade de-icing arrangement according to claim 6, characterized in that: the ceramic electrothermal film (3) is controlled in different working modes, including three different modes of non-working mode, anti-icing mode and deicing mode;
the modes of non-operation are: when the external temperature monitored by the external sensing detection device is higher than 0 ℃, the ceramic electrothermal film (3) of the anti-icing system does not work, the external sensing detection device works, and the feedback information and the temperature information of the external icing sensor are monitored and fed back in real time;
the anti-icing mode is as follows: when the external temperature monitored by the external sensing detection device is less than or equal to 0 ℃, the feedback information of the icing sensor of each divided area indicates that the blades of each area on the fan blade are not iced at present, and the deicing system control cabinet controls the ceramic electrothermal films (3) of each area to work so that the temperature is maintained at 0 ℃;
the deicing mode is as follows: when the external temperature monitored by the external sensing detection device is less than or equal to 0 ℃, and the feedback information of the icing sensors in each divided area indicates that the icing phenomenon occurs in a certain area on the current fan blade, the PLC in the deicing system control cabinet controls the ceramic electric heating film (3) in the icing area to work so as to perform the cyclic electric heating deicing for 4s, 7s and 4s respectively on the front blade surface (12), the front edge hot knife (13) and the rear blade surface (14) of the blade.
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| CN202010896280.4A CN112096577A (en) | 2020-08-31 | 2020-08-31 | Fan blade defroster |
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