CN209557171U - A kind of wind power generating set blade deicer of hot blast formula - Google Patents

Abstract

The utility model discloses a kind of wind power generating set blade deicers of hot blast formula, including blade leading edge intracavitary heating device and ventilation shaft is arranged in, heating device includes air blower and heater, the output end of heater connects air hose, the outlet air end of air hose is threaded through on the wind deflector being arranged in blade inner cavity, the distance between wind deflector and blade blade root are greater than 1/10th of blade total length, blade inner cavity is divided into heating zone and unheated zone by the wind deflector, the deicer further includes the control cabinet that blade inner cavity root is arranged in, the heating device connects control cabinet.The wind power generating set blade deicer of the utility model hot blast formula can carry out effective deicing to the blade of wind power generating set, guarantee the operational safety of wind power generating set and improve the generated energy of Wind turbine, have very high practical value.

Description

A hot blast type wind turbine blade deicing device

technical field

The utility model relates to the technical field of deicing blades of wind power generators, in particular to a hot blast type blade deicing device for wind power generators.

Background technique

Green energy such as wind energy and solar energy is a clean energy that is vigorously developed in the world today. Wind energy can be developed and utilized on a large scale due to its huge reserves and wide application range. The development and utilization of wind energy has far-reaching significance for environmental protection and optimization of traditional energy structure. Today, with the continuous expansion of the construction scale of low-wind speed wind farms, the blades of wind farms in the Yunnan-Guizhou Plateau are mostly affected by freezing. Icing of wind turbine blades is an important reason for large wind turbines to lose a large amount of power generation in areas with high humidity and low temperature. Icing of wind turbine blades will increase the static load of the wind turbine and reduce the power generation efficiency of the unit. Shutdown; and, blade ice can change the dynamic balance of the fan, increase the unbalanced load of the fan, lead to accelerated fatigue of the fan components, reduce the service life, and may cause blade cracking, breaking and unit collapse in severe cases. In addition, when the blades rotate, ice cubes attached to the blades may be thrown out, causing damage to the surrounding population and property. The existing deicing system design temperature detection equipment has poor installation and application durability, poor support structure integrity, low structural strength and safety, and the heating position is fixed. Therefore, it is imminent to provide a reliable and efficient deicing device for wind turbine blades. The publication date is January 19, 2018, and the Chinese patent document with the publication number CN107605670A discloses a wind turbine blade deicing system. The heating source is a carbon fiber heating cable, and the heating source is located in the inner cavity of the leading edge of the blade. The fixing method of the blade leading edge shell is vacuum infusion or wet bag pressing molding process. According to the temperature required for blade deicing, a certain length of carbon fiber heating cable is designed, and the cables are laid according to a certain distance at the required heating position of the blade leading edge. At the same time, the two terminals of the carbon fiber heating cable are reserved for later connection with the power line. The laying process of this system is simple, the production cost is low, and it can be laid on the surface of the inner cavity of the irregular blade; the heating efficiency is high, the temperature rises rapidly, and it is safe and reliable. , Temperature control Only by setting the length of the cable, the temperature can be precisely controlled, which avoids the damage of the FRP material of the blade due to the failure of other methods of electric heating temperature control. This method pre-embeds carbon fiber heating cables during the manufacture of the blades, and uses the heating cables for heating and deicing, but this method not only increases the difficulty of manufacturing the blades, increases the manufacturing cost of the blades, but also easily affects the structure of the blades strength.

Utility model content

The purpose of this utility model is to solve the problem that the wind power generating set in the prior art is easy to cause power drop and shutdown after the surface of the blade freezes, and the blade may crack, break and the unit collapses, and to provide a hot blast type The wind turbine blade deicing device can effectively deice the blades of the wind turbine to ensure the safe operation of the wind turbine and increase the power generation of the wind turbine.

The specific solution adopted by the utility model to solve the above technical problems is that a hot air blowing wind turbine blade deicing device includes a heating device and a ventilation duct arranged in the inner chamber of the blade, the heating device and The ventilation duct is arranged in the leading edge cavity of the blade, and the heating device includes a blower and a heater connected to the outlet end of the blower, the output end of the heater is connected to the air pipe, and the air outlet end of the air pipe is passed through the inner chamber of the blade On the installed windshield, the distance between the windshield and the root of the blade is greater than one-tenth of the total length of the blade, and the windshield divides the inner cavity of the blade into a heating zone and a non-heating zone. The deicing device also includes a control cabinet arranged at the root of the inner cavity of the blade, and the heating device is connected to the control cabinet. The control cabinet of the utility model is installed inside the blade. Since the blade is rotating and can change the pitch during operation, it needs to bear sufficient centrifugal force and rotational acceleration during the start-up process of the pitch change. Therefore, the control cabinet is installed close to the blade. The root of the inner cavity of the blade in the center of rotation; the control cabinet can provide power for the blade deicing device, and the power supply voltage is a variety of voltages, such as 690V, 230V, 24V, etc. The control cabinet has a built-in special control program and safety protection logic, which can automatically control the system. The heating device outputs hot air, which is fed into the inner cavity of the blade through the air duct to achieve deicing of the blade, and the windshield is used to isolate the heated area from the non-heated working area. In this way, the utility model solves the problem that the surface of the blades of the wind power generating set in the prior art is likely to cause power drop and shut down after freezing, and may cause the problems of blade cracking, breaking and unit collapse, and ensures the operation of the wind power generating set Safe and increase the power generation of wind turbines.

As a preference, the output end of the heater is connected to the air duct through the air duct adapter, and a metal bellows is arranged between the air duct and the air duct adapter, between the input end of the heater and the blower, between the output end of the heater and the High temperature resistant gaskets are provided between the air duct adapters and between the air duct adapters and the metal bellows. The size of the air inlet and outlet of the air duct adapter of the utility model is different, it is a conversion device connecting the heater and the air duct, and in order to make the structure close to the air duct on the blade web, the side projection of the overall structure of the air duct adapter The inclined trapezoid provides offset for the connection, while the metal bellows is cylindrical, which can provide longitudinal stretch and lateral offset. The high-temperature-resistant gasket can seal the connection of the deicing device, and the material temperature resistance of the high-temperature-resistant gasket will not age for a long time at an ambient temperature of at least 100°C.

Preferably, the motor of the blower is installed on both sides of the casing of the blower and provided with a moisture-proof heating belt, and the casing is a split structure composed of two pieces. The blower of the utility model is a centrifugal blower, which can provide high-pressure and high-flow air outlet, and the air outlet is connected by a flange. The motor of the blower is installed on both sides of the casing of the blower and is equipped with a moisture-proof heating belt. The motor has a double support structure with a casing and a bracket, so that the motor as a whole has the functions of dustproof, waterproof, and salt spray. The casing is a split structure, which can be disassembled into two halves for easy installation and maintenance.

Preferably, several temperature sensors are arranged on the air pipe, the temperature sensors are fixed on the air pipe through the base of the temperature sensor, and the temperature sensors are connected to the control cabinet. The temperature sensor of the utility model has temperature probes of different lengths, so that the temperature sensor has a variety of detection lengths, and can measure the temperature of the tube core or the temperature of the inner wall of the near tube. The control cabinet controls the working state of the heating device according to the data of the temperature sensor.

Preferably, the control cabinet is fixed on the control cabinet bracket, the control cabinet bracket is integrally fixed with the inner wall of the paddle through glass fiber cloth, and a partition is provided between the control cabinet and the heating device. The control cabinet of the utility model is integrally fixed on the inner wall of the blade by hand-pasting with glass fiber cloth after being connected with a special control cabinet bracket, so that the control cabinet can withstand sufficient centrifugal force during the working process and rotational acceleration.

As a preference, the heating power of the heating device is 20kW-35kW, and an over-temperature protector is equipped at the air inlet and/or air outlet of the heater, the over-temperature protector is connected to the control cabinet, and the shell of the heater and the connection The parts are all made of stainless or anti-rust coating materials, and the heater shell is a pressure-resistant structure. The heating power of the heating device of the utility model is 20kW-35kW, the output power can be controlled through the control cabinet, the power can be adjusted, and the over-temperature protector can ensure the safe operation of the heating device. The heater shell is a pressure-resistant structure, and its pressure-bearing capacity is greater than the maximum wind pressure of the blower.

As a preference, a heating device bracket is provided inside the paddle, and the heating device bracket includes a main bracket and a motor mounting bracket. The central planes of the plates intersect, and the motor mounting frame is vertically arranged on the main support; the mounting plane of the motor mounting frame is perpendicular to the direction of the centrifugal force generated by the blower motor during the rotation of the blades of the wind turbine. The structure of the main bracket of the utility model is symmetrical, which ensures that the symmetrical plane of the main bracket can intersect with the center of the section of the blade installation position after installation, and ensures that the contact connection between the bottom of the main bracket and the inner wall surface of the blade can follow the shape, and the chord section of the blade The deviation is less than 2%; the motor mounting bracket is installed vertically on the main body of the bracket, and its installation plane is perpendicular to the direction of the centrifugal force generated by the blower motor during the rotation of the blades of the wind turbine, and can withstand the centrifugal force from the motor to the blades.

Preferably, the edge shape of the windshield matches the cross-sectional shape of the blade at the installation position, and the air outlet end of the air duct protrudes from the windshield so as to send hot air into a relatively deep part of the inner cavity of the blade.

Preferably, a telescopic tube is sleeved inside the air duct, the outer diameter of the telescopic tube matches the inner diameter of the air duct, a sliding support plate is provided at the outlet end of the telescopic tube, a pull cord is fixed on the sliding support plate, and a There is a pull-cord motor and a pull-cord driving wheel, and a reversing pulley is provided on the inner wall of the blade far away from the windshield. switch; the pull rope motor and the retractable limit switch are both connected to the control cabinet. A telescopic tube is set in the air duct, and the length of the telescopic tube protruding from the air duct is adjusted by driving the cord motor, and the telescopic tube is pulled out or retracted from the air duct by the forward and reverse rotation of the cord motor, correspondingly Changing the total length of the air supply duct means changing the air outlet position of the air supply duct in the paddle. The setting of the sliding support plate is to ensure a certain distance between the air outlet of the telescopic tube and the inner wall of the paddle. The friction method is in contact with the inner wall of the blade, so as to ensure the smooth pulling or retracting of the telescopic tube; the telescopic limit switch can control the limit position of the telescopic tube being pulled out or retracted from the air duct, so that it can be aimed at the main icing position of the blade Carry out focused deicing to speed up the deicing process.

The beneficial effects of the utility model are: it effectively solves the problems of the prior art wind power generators that easily cause power drop and shut down after the surface of the blade freezes, and that the blade may crack, break and the unit collapses. The blade deicing device of the hot blast type wind power generating set of the utility model can effectively deice the blades of the wind generating set, ensure the operation safety of the wind generating set and increase the power generation of the wind generating set, and has high practicality. value.

Description of drawings

Fig. 1 is a kind of structural representation of the blade de-icing device of the wind power generating set of hot blast type of the utility model;

Figure 2 is a partially enlarged view of Figure 1;

Fig. 3 is a partial enlarged view of Fig. 2;

Fig. 4 is a schematic diagram of an installation position of the blade deicing device of the present invention in the blade;

Fig. 5 is a schematic diagram of a partial structure of the blade deicing device of the present invention.

In the figure: 1. Front cavity, 2. Blower, 3. Heater, 4. Air duct, 5. Windshield, 6. Control cabinet, 7. Air duct adapter, 8. Metal bellows, 9. High temperature resistance Gasket, 10. Temperature sensor, 11. Temperature sensor base, 12. Heating device bracket, 13. Telescopic tube, 14. Sliding support plate, 15. Pull rope, 16. Pull rope motor, 17. Pull rope driving wheel, 18 . Reversing pulley, 19. Blade, 20. Generator set.

Detailed ways

The implementation of the utility model will be further described below by way of examples and in conjunction with the accompanying drawings.

Example 1

In the embodiment 1 shown in Fig. 1 Fig. 2, a kind of deicing device of blade 19 of wind power generation unit 20 blades of a kind of hot blast type, comprises the heating device and ventilation pipe that are arranged in blade inner cavity, described heating device and ventilation ducts are arranged in the leading edge cavity 1 of the blade (see Figure 4, the oblique dotted line in the figure is the centerline of the blade web), and the heating device includes a blower 2 and a heater 3 connected to the outlet end of the blower , the output end of the heater is connected to the air pipe 4, and the air outlet end of the air pipe is set on the windshield 5 set in the inner cavity of the blade (see Figure 3). The distance between the windshield and the root of the blade Greater than one-tenth of the total length of the blade, the edge shape of the windshield matches the cross-sectional shape of the blade at the installation position, and the windshield divides the inner cavity of the blade into a heating area and a non-heating area, The deicing device also includes a control cabinet 6 (see FIG. 2 ) arranged at the root of the inner chamber of the blade, and the heating device is connected to the control cabinet. The control cabinet is fixed on the control cabinet support, and the control cabinet support is integrally fixed with the inner wall of the blade through glass fiber cloth, and a partition is provided between the control cabinet and the heating device. The control cabinet of the utility model is integrally fixed on the inner wall of the blade by hand-pasting with glass fiber cloth after being connected with a special control cabinet bracket, so that the control cabinet can withstand sufficient centrifugal force during the working process and rotation during the pitch start process acceleration. The control cabinet can provide power for the blade de-icing device, and the power supply voltage is a variety of voltages, such as 690V, 230V, 24V, etc. The control cabinet has a built-in special control program and safety protection logic, which can automatically control the system. The heating device outputs hot air, and the hot air is output through the air pipe, and the windshield is used to isolate the heating area and the non-heating working area. The air outlet end of the air pipe protrudes from the windshield, and can put the hot air into the deep cavity of the blade. to de-ice the blades.

The output end of the heater is connected to the air duct through the air duct adapter 7. The air inlet and the air outlet of the air duct adapter have different cross-sectional sizes, which is a conversion device connecting the heater and the air duct, and in order to make the structure close to the blade web The side projection of the overall structure of the air duct and the air duct adapter is trapezoidal, which provides an offset for the connection; a metal bellows 8 is provided between the air duct and the air duct adapter. The metal bellows is cylindrical and can provide longitudinal stretching And lateral offset, wherein the axial rated compensation amount is greater than 100mm, and the lateral rated compensation amount is greater than 30mm. Between the input end of the heater and the blower, between the output end of the heater and the air pipe adapter, and between the air pipe adapter and the metal bellows, a high temperature resistant gasket 9 is provided; the high temperature resistant gasket can deicing The connection of the device is sealed to prevent air leakage during the operation of the device, resulting in insufficient pressure in the system. The temperature resistance of the material of the high temperature resistant gasket can work at a temperature of 100°C for a long time without aging. In addition, the length of the air duct can be determined according to the installation space. The air duct can be laid and installed as a whole or divided into multiple sections. The connection is sealed to ensure the structural strength and sealing of the air duct connection.

The motor of the blower is installed on both sides of the casing of the blower and is provided with a moisture-proof heating belt. The air pipe is provided with several temperature sensors 10, and the temperature sensors are fixed on the air pipe through the temperature sensor base 11. The temperature sensors are connected to Control cabinet. The blower is a centrifugal blower, which can provide high-pressure and high-flow air outlet, and the air outlet is flanged. The motor of the blower is installed on both sides of the casing of the blower and is equipped with a moisture-proof heating belt. The motor has a double support structure with a casing and a bracket. The motor as a whole has the functions of dustproof, waterproof, and salt spray. The casing is a split structure, which can be disassembled into two halves for easy installation and maintenance. The temperature sensor is installed on the air duct through the base of the temperature sensor, and its detection length is various, which can measure the temperature of the core of the duct or the temperature of the inner wall of the near duct.

The heating power of the heating device of the utility model is 20kW-35kW, and an over-temperature protector is provided at the air inlet and outlet of the heater, between the air pipe adapter and the metal bellows, and the over-temperature protector is connected and controlled cabinet. The output power is controlled by the control cabinet, the power can be adjusted, and the over-temperature protector is used to ensure the safe operation of the heating device; the shell and connecting parts of the heater are made of stainless heat-resistant steel, and the shell of the heater is a pressure-resistant structure. The pressure bearing capacity is greater than the maximum wind pressure of the blower.

A heating device bracket 12 is arranged in the paddle, and the heating device bracket includes a main bracket and a motor mounting frame. The main bracket is a symmetrical structure, and the symmetrical center plane of the main bracket is connected to the center of the paddle web at the installation place of the main bracket. The planes intersect, and the motor mounting frame is vertically arranged on the main support (see Figure 3); the mounting plane of the motor mounting frame is perpendicular to the direction of the centrifugal force generated by the blower motor during the rotation of the blades of the wind turbine. The structure of the main bracket is symmetrical. After installation, the symmetry plane of the main bracket can intersect with the center of the cross section of the blade installation position. The bottom of the main bracket fits the inner wall of the blade, and the deviation of the chord section of the blade is less than 2%; the motor mounting frame is installed vertically On the main body of the bracket, its installation plane is perpendicular to the direction of the centrifugal force generated by the blower motor during the rotation of the blades of the wind turbine, and can withstand the centrifugal force of the motor in the direction of the blades.

Example 2

In the embodiment 2 shown in Fig. 5, the telescopic tube 13 is sleeved inside the air duct, and the outer diameter of the telescopic tube is adapted to the inner diameter of the air duct. The outlet end of the telescopic tube is provided with a sliding support plate 14, on which A stay cord 15 is fixed, a stay cord motor 16 and a stay cord drive wheel 17 are arranged on the windshield, and a reversing pulley 18 is arranged on the blade inner wall away from the windshield, and the stay cord is wound around the stay cord drive wheel And on the pulley, the inner wall of the paddle is also provided with a telescopic limit switch; the rope motor and the telescopic limit switch are connected to the control cabinet. A telescopic tube is set in the air duct, and the length of the telescopic tube protruding from the air duct is adjusted by driving the cord motor, and the telescopic tube is pulled out or retracted from the air duct by the forward and reverse rotation of the cord motor, correspondingly Changing the total length of the air supply duct means changing the air outlet position of the air supply duct in the paddle. The setting of the sliding support plate is to ensure a certain distance between the air outlet of the telescopic tube and the inner wall of the paddle. The friction mode is in contact with the inner wall of the blade, thereby ensuring the smooth pulling out or retracting of the telescopic tube; the telescopic limit switch can control the limit position of the telescopic tube being pulled out or retracted from the air duct, and the rest are the same as in Embodiment 1.

In addition to the above-mentioned embodiments, within the scope disclosed in the claims of the utility model and the description, the technical features or technical data of the utility model can be reselected and combined to form new embodiments, which are technical aspects of the art. Personnel can realize without creative work, so these embodiments of the utility model that are not described in detail should also be regarded as specific embodiments of the utility model and within the protection scope of the utility model.

Claims (10)

1. A hot blast type wind turbine blade deicing device, comprising a heating device and a ventilation duct arranged in the inner chamber of the blade, characterized in that: the heating device and the ventilation duct are arranged at the leading edge of the blade In the cavity (1), the heating device includes a blower (2) and a heater (3) connected to the outlet of the blower. On the windshield (5) set in the inner cavity of the blade, the distance between the windshield and the root of the blade is greater than one tenth of the total length of the blade, and the windshield divides the inner cavity of the blade into a heating zone and non-heating zone, the deicing device further includes a control cabinet (6) arranged at the root of the inner chamber of the blade, and the heating device is connected to the control cabinet. 2. The blade de-icing device of hot blast type wind power generating set according to claim 1, characterized in that the output end of the heater is connected to the air duct through the air duct adapter (7), and the air duct is connected to the air duct. A metal bellows (8) is provided between the pipe adapters, between the input end of the heater and the blower, between the output end of the heater and the air pipe adapter, and between the air pipe adapter and the metal bellows. A high temperature resistant gasket (9) is provided. 3. The blade deicing device of hot air blast type wind power generating set according to claim 1, characterized in that, the motor of the blower is installed on both sides of the blower casing and is provided with a moisture-proof heating belt, the The casing is a split structure composed of two parts. 4. The blade de-icing device of hot blast type wind power generating set according to claim 1, characterized in that, the air duct is provided with several temperature sensors (10), and the temperature sensors pass through the temperature sensor base ( 11) Fixed on the ventilation pipe, the temperature sensor is connected to the control cabinet. 5. The blade deicing device of hot blast type wind power generating set according to claim 1, characterized in that, the control cabinet is fixed on the control cabinet support, and the control cabinet support is connected to the blade by glass fiber cloth. The inner wall is integrally fixed; there is a partition between the control cabinet and the heating device. 6. The blade de-icing device of hot blast type wind power generating set according to claim 1, characterized in that, the heating power of the heating device is 20kW-35kW, and the heater air inlet and/or air outlet are equipped with An over-temperature protector, the over-temperature protector is connected to the control cabinet, the heater housing and connectors are made of stainless or anti-rust coating materials, and the heater housing is a pressure-resistant structure. 7. The blade deicing device of hot blast type wind power generating set according to claim 1, characterized in that, a heating device bracket (12) is arranged inside the blade, and the heating device bracket includes a main bracket and a motor The mounting bracket, the main bracket is a symmetrical structure, the symmetrical central plane of the main bracket intersects the central plane of the paddle web plate where the main bracket is installed, and the motor mounting bracket is vertically arranged on the main bracket. 8. The blade de-icing device of the hot blast type wind power generating set according to claim 7, characterized in that, the installation plane of the motor mounting frame is perpendicular to the centrifugal force generated by the blower motor during the rotation of the blades of the wind generating set direction. 9. The blade de-icing device for hot blast type wind power generating set according to claim 1, characterized in that, the shape of the edge of the windshield matches the cross-sectional shape of the blade at the installation position, The air outlet end of the air duct protrudes from the windshield. 10. The hot blast type blade deicing device for wind power generator set according to any one of claims 1-9, characterized in that, a telescopic tube (13) is sleeved inside the air duct, and the outer diameter of the telescopic tube is the same as that of the wind. The inner diameter of the tube is suitable, and the outlet end of the telescopic tube is provided with a sliding support plate (14), a pull rope (15) is fixed on the slide support plate, and a pull rope motor (16) and a pull rope driving wheel are arranged on the windshield (17), a reversing pulley (18) is provided on the inner wall of the blade far away from the windshield, and the stay rope is wound on the pull rope driving wheel and the pulley, and a telescopic limit switch is also provided on the inner wall of the blade; Both the pull rope motor and the telescopic limit switch are connected to the control cabinet.