Heater mounting structure of fan blade gas-heat deicing system

Abstract

The invention discloses a fan blade gas heat deicing system heater mounting structure which comprises a blade and a heater, a blade girder is mounted on the blade, the interior of the blade is divided into a blade front edge cavity and a blade rear edge cavity by a blade web, heater mounting plates are mounted on the blade girder of the blade front edge cavity and the blade web, and the heater mounting plates are mounted on the heater mounting plates. The heater is fixedly connected with the heater mounting plate, an air inlet of the heater is connected with an air outlet of an air blower through an air inlet pipe, and an air outlet of the heater is fixedly connected with a baffle arranged in a blade front edge cavity. A shell of the heater is a non-metal shell. The heater provided by the invention is small in heat loss, can deice more by using gas heat, and reduces the self-power consumption.

Description

Technical Field

[0001] The invention relates to a gas-heating deicing system for a wind generator set, and in particular to a heater installation structure for a gas-heating deicing system for a fan blade. Background Art

[0002] At present, wind turbines located in mountainous areas in the north and south are faced with the problem of being unable to generate electricity in winter due to ice on the blades: since there is no effective means to remove the ice from the blades, they can only wait for the weather to warm up and the ice to melt naturally, resulting in huge losses in power generation. The ice also has a serious impact on the safety, service life, and maintenance costs of the units, causing safety hazards to surrounding people, livestock, and equipment, and impacting the stable operation of the power grid, exacerbating the contradiction between electricity consumption and power generation during the ice period.

[0003] Gas-heat deicing is a relatively mature method for deicing blades of wind turbines. It can be used for both the modification of existing wind turbines and the installation of new wind turbines. It has a long service life, is easy to maintain, will not attract lightning, and has a certain anti-icing ability. The principle of gas-heat deicing is: the inside of the blade is a closed cavity, and a blower and a heater are installed in the blade cavity. The heater heats the cold air in the blade, and then the blower sends the heated hot air out, which circulates along the designed air duct in the blade. The hot air heats the inner surface of the blade, and the heat is transferred from the inner surface of the blade to the outer surface of the blade. When the temperature of the outer surface of the blade exceeds zero degrees, the anti-icing and deicing effect can be achieved. When designing specifically, such as Figure 1 As shown, the heater 1 and the blower 2 are installed in the manhole baffle at the root of the blade, and the heater outlet sends the hot air to about one-third of the blade length through the air duct 4. Because the space of the leading edge airflow channel 14 is too small to be constructed, a baffle 3 is installed here so that the hot air flowing out of the air duct 4 can only move along the leading edge airflow channel 14 toward the blade tip 5 and cannot flow back.

[0004] The shell of the existing heater 1 is made of steel and is generally heavy. Because the blade web supporting the blade structure is made of fiberglass with a thickness of about 10-15 mm, it cannot withstand too much pressure. Therefore, the heater cannot be installed on the blade web 9 under normal circumstances, and only the relatively light air guide 4 can be installed on the blade web 9; at the same time, considering the increased blade rotation inertia of the heater 1, it is also better to install the heater 1 at a position closer to the blade rotation center, see Figure 2 This traditional heater and its installation method require that the hot air heated by the heater 1 needs to pass through the air duct 4 which is nearly one-third of the blade length before it can be used for deicing, resulting in a large amount of heat loss. According to measurements, the lost heat can reach more than 30% of the total heat generated by the heater 1, which greatly reduces the deicing effect of the deicing system and increases the self-consumption of electricity.

[0005] How to design a better heater and its installation method and location to reduce heat loss in the air duct while not putting too much pressure on the blade web and not increasing the blade's rotational inertia too much has always been a problem for technicians engaged in gas-thermal deicing of fan blades. Summary of the invention

[0006] The technical problem to be solved by the present invention is that, in view of the large heat loss of the heater in the existing wind turbine generator set gas-thermal deicing system, the present invention provides a heater installation structure for the fan blade gas-thermal deicing system, which can use more heater heat for gas-thermal deicing, improve the deicing effect, and reduce the system's self-consumption of electricity.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A heater installation structure for a fan blade air-heat deicing system comprises a blade and a heater, wherein a blade beam is installed on the blade, and the interior of the blade is divided into a blade leading edge cavity and a blade trailing edge cavity by a blade web, and a baffle for preventing hot air from flowing back is installed in the blade leading edge cavity, and the structural features thereof are: A heater mounting plate is installed on the blade beam and the blade web on the blade root side of the baffle in the blade leading edge cavity, the heater is connected and fixed to the heater mounting plate, the air inlet of the heater is connected to the air outlet of the blower through an air inlet pipe, and the air outlet of the heater is connected and fixed to the baffle provided in the blade leading edge cavity; The relationship between the power of the heater and the length of the fan blade must satisfy: W=K×L, where W is the power of the heater, 1 / 3≤K≤4 / 9, and L is the length of the fan blade; The shell of the heater is a non-metal shell.

[0008] The present invention moves the installation position of the heater forward to the blade beam and the blade web on the side of the baffle near the blade root, so that the length of the air duct installed between the heater outlet and the baffle can be significantly smaller than the length of the air duct of the conventional fan blade gas thermal deicing system, and the air outlet of the heater can even be directly connected to the baffle, so that the heat dissipated through the air duct is greatly reduced, and the minimum loss can be zero, which not only improves the gas thermal deicing effect, but also reduces the capacity of the heater, the volume and the weight under the same deicing heat demand of the blade, so that the self-consumption of power for gas thermal deicing is reduced; on this basis, the present invention further reduces the weight of the heater by changing the material of the heater shell to non-metal, so as to further reduce the weight of the heater, make the pressure of the heater on the blade web smaller, ensure that the heater is reliably and stably installed on the blade web, even if the heater is installed on the blade web, the rotation radius of the heater is increased, and the influence on the rotational inertia of the blade is not large, thereby ensuring the normal rotation of the blade.

[0009] It can be seen that the present invention utilizes the blade beam and blade web on the blade root side of the baffle in the blade leading edge cavity to install the heater, and the technology of using a non-metallic shell for the heater solves the problem that the heater is too heavy and cannot be fixed to the blade web (the blade web is relatively thin and has a great load-bearing risk). The solution to this problem greatly improves the heat utilization rate of gas-thermal deicing, and the deicing effect is immediately improved.

[0010] Preferably, the air outlet of the heater is connected and fixed to the baffle via an air guide duct, so as to further reduce the influence of the heater on the rotational inertia after being installed on the blade web.

[0011] Preferably, the air inlet and the air outlet of the heater are connected to the air inlet pipe or the baffle or the air guide pipe via flanges respectively.

[0012] Preferably, the air inlet duct and the air guide duct are respectively connected and fixed to the blade web via hand-laid fiberglass cloth.

[0013] Preferably, the shell of the heater is made of bakelite or basalt fiber composite material.

[0014] Preferably, heater mounting plates are respectively installed on the blade beams on both sides of the blade leading edge cavity, and the heater is respectively connected and fixed to the heater mounting plates on the blade beams on both sides of the blade leading edge cavity.

[0015] Preferably, a support plate is installed between the heater mounting plate and the blade beam to ensure the installation strength of the heater mounting plate.

[0016] Preferably, the heater mounting plate, the support plate and the blade beam on the same side of the heater are an integrated structure.

[0017] Preferably, the heater is in the shape of a cube or a cylinder.

[0018] Preferably, the value range of the K value is: 2 / 5≤K≤4 / 9.

[0019] Preferably, a rubber pad is provided between the heater and the blade web to achieve shock absorption and heat insulation effects.

[0020] Principle of the design method of the present invention: 1. Fix the heater with the help of the blade beam so that the heater is installed on the blade web; 2. After the heater is installed on the blade belly, the distance from the air duct to the baffle is shortened, the air duct reduces heat dissipation, the heater capacity can be reduced, the volume can be reduced, and the weight can be reduced; 3. Reduce the weight of the heater by changing the material of the heater shell to non-metal; 4. The heater is lighter, which puts less pressure on the blade web; 5. The heater has been reduced in weight. Even if it is installed on the blade belly, which increases its rotation radius, it has little effect on the blade's rotational inertia.

[0021] Compared with the prior art, the present invention has the following beneficial effects: 1) The present invention makes it possible to fix the heater without bolts to the bracket, and the bracket is then manually attached to the inner surface of the blade root (such as Figure 2 ), but the heater mounting plate fixed to the blade beam by hand-layup is fixed to the blade web, which not only ensures the reliable fixation of the heater, but also makes the force on the blade web very small, ensuring the safety of the blade web; 2) The heater of the present invention is provided with hanging ears on both sides, and flanges are designed for the air outlet and the air inlet, which not only ensures the reliable installation of the heater, but also makes the heater easy to disassemble; 3) The heater housing of the present invention uses heat-resistant polymer materials instead of steel, which greatly reduces the weight of the heater, which is not only conducive to reducing the moment of inertia, but also makes it safer to install the heater on the blade belly and convenient for on-site transportation; 4) The heater of the present invention is installed on the blade belly plate, and there is no need to manually paste the heater bracket or produce bulky and complicated heater brackets, which not only reduces the cost but also saves on-site construction time; 5) The heater of the present invention is installed on the blade belly plate, which can greatly reduce the heat dissipation of the air duct, improve the thermal energy utilization efficiency of the heater, reduce the maximum power of the heater, reduce the volume of the heater, further reduce the weight of the heater, and greatly reduce the self-consumption of electricity of the deicing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the installation structure of the existing wind turbine blade internal gas thermal deicing system, and the arrows in the figure indicate the direction of airflow.

[0024] Figure 2 The present invention is a schematic diagram of the installation status of the heater and the blower of the existing wind turbine blade internal air-heat deicing system.

[0025] Figure 3 It is a structural schematic diagram of installing a heater mounting plate on a blade beam according to the present invention.

[0026] Figure 4This is a schematic diagram of the installation status of the heater.

[0027] Figure 5 This is a schematic diagram of the heater's air outlet being directly connected and fixed to the baffle.

[0028] Figure 6 Structural diagram of the support plate between the heater mounting plate and the blade beam.

[0029] Figure 7 This is a schematic diagram of a one-side heater mounting plate designed as an integrated structure.

[0030] Figure 8 This is a structural diagram of a square heater.

[0031] Fig. 9 This is a structural diagram of a cylindrical heater.

[0032] In the figure: 1. heater; 2. blower; 3. baffle; 4. air guide duct; 5. blade tip; 6. blade leading edge cavity; 7. blade trailing edge cavity; 8. blade beam; 9. blade web; 10. support plate; 11. heater mounting plate; 12. air inlet duct; 13. return air flow channel; 14. leading edge air flow channel; 15. fan blade; 16. heating system support bracket; 17. hand-laid fiberglass cloth; 18. hanging ear. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0034] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] See also Figure 3 - Figure 4, an embodiment of the heater installation structure of the fan blade gas heating deicing system of the present invention comprises a blade and a heater 1, a blade beam 8 is installed on the blade, the interior of the blade is divided into a blade leading edge cavity 6 and a blade trailing edge cavity 7 by a blade web 9, a baffle 3 for preventing hot air backflow is installed in the blade leading edge cavity 6, a heater installation plate 11 is installed on the blade beam 8 and the blade web 9 near the blade root side of the baffle in the blade leading edge cavity 6, the heater 1 is connected and fixed to the heater installation plate 11, the air inlet of the heater 1 is connected to the air outlet of the blower 2 through the air inlet pipe 12, and the air outlet of the heater 1 is connected and fixed to the baffle 3 set in the blade leading edge cavity 6 through the air guide pipe 4. The relationship between the power of the heater 1 and the length of the fan blade satisfies: W=K×L, where W is the heater power, 1 / 3≤K≤4 / 9, and L is the length of the fan blade. The K value is preferably: 2 / 5≤K≤4 / 9.

[0037] In order to reduce the weight of the heater 1 , the shell of the heater 1 is made of non-metallic material.

[0038] When implementing it, the following solutions can be adopted: 1. Install four heater mounting plates 11 by hand on both sides (in the direction of the blade cross section) of the blade web 9 where the air inlet duct 12 is installed in the blade leading edge cavity 6, two on each side. The root of each heater mounting plate 11 is fixedly connected to the blade beam 8, and the side is bonded to the blade web 9, see Figure 3 ; 2. Install the heater 1 in the middle of the four heater mounting plates 11. The heater 1 is fixed to the heater mounting plates 11 by bolts through its two pairs of left and right hanging ears 18. Figure 4 ; 3. The air inlet and outlet of the heater 1 are connected to the air inlet pipe 12 or the air guide pipe 4 via flanges respectively; 4. The air inlet pipe 12 and the air guide pipe 4 are connected and fixed to the blade web 9 by hand-laid glass fiber cloth 17; 5. The heater 1 can be installed in front of the baffle 3 (the baffle 3 is installed in the blade leading edge cavity 6 where the air duct 4 can no longer pass through, which is the same as the existing technology), the air inlet is connected to the air inlet duct 12 through a flange, and the air outlet is directly connected and fixed to the baffle 3 through a flange, so as to send the hot air to the blade leading edge plate close to the blade tip 5 as much as possible, thereby improving the deicing effect of the blade leading edge plate, see Figure 5 ; 6. The shell of the heater 1 is made of a polymer material with a heat resistance of more than 300 degrees Celsius, good thermal insulation performance, and flame retardancy, such as bakelite or basalt fiber composite material; 7. Support plates 10 are installed between the heater mounting plates 11 on the left and right sides of the heater 1 and the blade beam 8 to strengthen the structure. Figure 6, and the two heater mounting plates 11 on the same side of the blade beam 8 and the corresponding support plate 10 can be designed as an integrated structure, such as Figure 7 ; 8. The heater 1 can be designed into a square shape, such as Figure 8 , can also be designed as a cylindrical body, such as Fig. 9 ; 9. In order to reduce vibration and further insulate heat, a rubber pad is placed between the heater 1 and the blade web 9.

[0039] The above is only a specific implementation scheme of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the art can make many possible changes and modifications to the technical scheme of the present invention by using the technical content disclosed above without departing from the scope of the technical scheme of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical scheme of the present invention should fall within the protection scope of the technical scheme of the present invention.

Claims

1. A heater installation structure for a fan blade gas heating deicing system, comprising a blade and a heater, wherein a blade beam is installed on the blade, and the interior of the blade is divided into a blade leading edge cavity and a blade trailing edge cavity by a blade web, and a baffle for preventing hot air from flowing back is installed in the blade leading edge cavity, characterized in that: A heater mounting plate is installed on the blade beam and the blade web on the blade root side of the baffle in the blade leading edge cavity, the heater is connected and fixed to the heater mounting plate, the air inlet of the heater is connected to the air outlet of the blower through an air inlet pipe, and the air outlet of the heater is connected and fixed to the baffle provided in the blade leading edge cavity; The relationship between the power of the heater and the length of the fan blade must satisfy: W=K×L, where W is the power of the heater, 1 / 3≤K≤4 / 9, and L is the length of the fan blade; The shell of the heater is a non-metal shell.

2. The heater installation structure for the fan blade gas heating deicing system according to claim 1 is characterized in that: The air outlet of the heater is connected and fixed to the baffle via an air guide pipe.

3. The heater installation structure for the fan blade gas heating deicing system according to claim 2 is characterized in that: The air inlet and the air outlet of the heater are connected to the air inlet pipe or the baffle or the air guide pipe via flanges respectively.

4. The heater installation structure for the fan blade gas heating deicing system according to claim 2 is characterized in that: The air inlet pipe and the air guide pipe are respectively connected and fixed to the blade web by hand-laid fiberglass cloth.

5. The heater installation structure for the fan blade gas heating deicing system according to claim 1 is characterized in that: The shell of the heater is made of bakelite or basalt fiber composite material.

6. The heater installation structure for the fan blade gas heating deicing system according to claim 1 is characterized in that: Heater mounting plates are respectively installed on the blade beams on both sides of the blade leading edge cavity, and the heaters are respectively connected and fixed to the heater mounting plates on the blade beams on both sides of the blade leading edge cavity.

7. The heater installation structure for the fan blade gas heating deicing system according to claim 6 is characterized in that: A support plate is installed between the heater mounting plate and the blade beam.

8. The heater installation structure for the fan blade gas heating deicing system according to claim 7 is characterized in that: The heater mounting plate, the support plate and the blade beam on the same side of the heater are an integrated structure.

9. The heater installation structure for fan blade gas heating deicing system according to any one of claims 1 to 8, characterized in that: The value range of K is: 2 / 5≤K≤4 / 9.

10. The heater installation structure for fan blade gas heating deicing system according to any one of claims 1 to 8, characterized in that: A rubber pad is arranged between the heater and the blade web.

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