Heat absorption type gas heat deicing device for wind power blade

Abstract

The invention discloses a wind power blade heat absorption type gas heat deicing device which comprises a blade, two webs are fixedly connected to an inner cavity of the blade, the two webs are arranged in parallel and extend towards the tip end of the blade, a support is fixedly connected into the inner cavity of the blade, the support is arranged close to the root of the blade, and a fan is fixedly connected to the support. The air outlet end of the fan is fixedly connected with an air duct pipe, the fan is communicated with the air duct pipe, the air inlet end of the fan is fixedly connected with a heater, the heater comprises an outer shell, a plurality of heating elements are fixedly connected in the outer shell, the outer shell is fixedly connected with a conical barrel, and the small-size end of the conical barrel is communicated with the air inlet end of the fan. The outer shell, the conical barrel and the fan are communicated with one another, a choke plate is arranged in the blade inner cavity, the choke plate is fixedly connected to the side wall of the blade inner cavity and the web plate, and the air duct pipe is fixedly connected to the choke plate. The heater is arranged at the air inlet end of the fan, so that the air blowing resistance of the fan can be reduced, and the mounting requirement in the inner cavity of the blade is met.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine blade deicing, and in particular to a heat absorbing gas-heat deicing device for wind turbine blades. Background Art

[0002] In winter, ice and frost form on the surface of wind turbine blades in high-altitude areas, causing changes in the geometric dimensions of the blade surfaces, resulting in a significant drop in the power generation of the unit or the unit shutting down for production, while also causing many safety hazards in the operation of the unit.

[0003] At present, there are several ways to de-ice blades: de-icing with electric heating film heating surface, de-icing with PTC electric heating and blowing, and de-icing with blade surface coating. Among them, de-icing with electric heating film blade surface has the best de-icing effect, but there are safety hazards such as blade damage caused by lightning strikes and inaccurate blade heating control. This type of de-icing method has a long installation cycle and high cost. De-icing with blowing PTC heating requires the fan, heater, and pipeline to be in a straight line to reduce wind resistance, and requires the blade cavity to have sufficient installation distance and installation position, resulting in insufficient area between the de-icing device and the blade cavity due to the installation position limitation, resulting in the risk of equipment falling.

[0004] Therefore, a wind turbine blade heat absorption gas thermal deicing device is proposed to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a wind turbine blade heat absorption gas heat deicing device to solve the problems existing in the above-mentioned prior art, reduce the installation cost of the deicing device, shorten the installation period, and facilitate installation.

[0006] To achieve the above object, the present invention provides the following solution: The present invention provides a wind turbine blade heat absorption gas heat deicing device, comprising:

[0007] The blade, the blade inner cavity is fixedly connected with two webs, the two webs are arranged in parallel, the two webs extend toward the blade tip, the blade inner cavity is fixedly connected with a bracket, the bracket is located at the end of the web, the bracket is arranged near the root of the blade, a fan is fixedly connected to the bracket, an air duct pipe is fixedly connected to the air outlet end of the fan, the fan is communicated with the air duct pipe, and a heater is fixedly connected to the air inlet end of the fan, the heater comprises an outer shell, a plurality of heating elements are fixedly connected to the outer shell, a conical cylinder is fixedly connected to the outer shell, a smaller end of the conical cylinder is communicated with the air inlet end of the fan, the outer shell, the conical cylinder and the fan are communicated with each other, a wind block plate is arranged in the blade inner cavity, the wind block plate is fixedly connected to the side wall of the blade inner cavity and the web, the air duct pipe passes through the wind block plate, and the air duct pipe is fixedly connected to the wind block plate.

[0008] The present invention discloses the following technical effects: In the present device, a heater is provided at the air inlet end of the fan. After the heating element of the heater is heated, the air entering the fan is heated. The hot air enters the fan through a conical tube and is then blown into the air duct by the fan. The air duct is located on one side of the web and at the leading edge of the blade. After the hot air is blown out of the air duct, it follows the leading edge of the blade until the tip of the blade. Since there is a gap between the two ends of the web and the inner wall of the blade, the hot air will return after reaching the tip of the blade, enter between the two webs, and the trailing edge of the blade, and finally return to the air inlet of the heater. The cycle works in this way, so that the temperature of the inner cavity of the wind turbine blade slowly rises to a fixed value. After the temperature of the inner cavity rises, it is transmitted to the outer surface of the blade so that the surface temperature of the blade reaches the deicing requirement, thereby realizing the deicing of the blade. In the present invention, the heater is arranged at the air inlet end of the fan, which can reduce the wind resistance of the fan blowing and meet the installation requirements in the inner cavity of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] 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 will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0010] Figure 1 It is a schematic diagram of the structure of the heat absorption gas-heat deicing device for wind turbine blades of the present invention;

[0011] Figure 2 It is a schematic diagram of the structure of the fan and heater of the present invention;

[0012] Among them, 1. blades; 2. belly plate; 3. bracket; 4. fan; 5. air duct; 6. heater; 7. outer shell; 8. heating element; 9. conical cylinder; 10. wind baffle. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Reference Figure 1-2 The present invention provides a wind turbine blade heat absorption gas heat deicing device, comprising:

[0016] Blade 1, two webs 2 are fixedly connected to the inner cavity of blade 1, the two webs 2 are arranged in parallel, and the two webs 2 extend to the tip of blade 1, a bracket 3 is fixedly connected to the inner cavity of blade 1, the bracket 3 is located at the end of web 2, the bracket 3 is arranged near the root of blade 1, a fan 4 is fixedly connected to the bracket 3, an air duct pipe 5 is fixedly connected to the air outlet end of fan 4, fan 4 is connected with air duct pipe 5, a heater 6 is fixedly connected to the air inlet end of fan 4, heater 6 comprises an outer shell 7, a plurality of heating elements 8 are fixedly connected to the outer shell 7, a conical cylinder 9 is fixedly connected to the outer shell 7, a smaller end of conical cylinder 9 is connected with the air inlet end of fan 4, the outer shell 7, conical cylinder 9 and fan 4 are connected with each other, a wind block plate 10 is arranged in the inner cavity of blade 1, the wind block plate 10 is fixedly connected to the inner cavity side wall of blade 1 and web 2, the air duct pipe 5 passes through the wind block plate 10, and the air duct pipe 5 is fixedly connected to the wind block plate 10.

[0017] In the present device, the blade 1 has a leading edge 11 and a trailing edge 12. Figure 1 As shown, a heater 6 is provided at the air inlet end of the fan 4. After the heating element 8 of the heater 6 is heated, the air entering the fan 4 is heated. The hot air enters the fan 4 through the conical tube 9, and is then blown into the air duct pipe 5 by the fan 4. The air duct pipe 5 is located on one side of the web 2, at the leading edge 11 of the blade 1. After the hot air is blown out of the air duct pipe 5, it follows the leading edge 11 of the blade 1 to the tip of the blade 1. Since there is a gap between the two ends of the web 2 and the inner wall of the blade 1, the hot air will return after reaching the tip of the blade 1, enter between the two webs 2, and the trailing edge 12 of the blade 1, and finally return to the air inlet of the heater 6. The cycle works in this way, so that the inner cavity temperature of the wind turbine blade 1 slowly rises to a fixed value. After the inner cavity temperature rises, it is transmitted to the outer surface of the blade 1 so that the surface temperature of the blade 1 meets the deicing requirement, thereby realizing blade deicing.

[0018] During installation, after the fan 4, heater 6 and bracket 3 are connected and fixed, the heat absorber is fixed to the root of the blade cavity by hand paste using the same resin, biaxial cloth and the like as the blade.

[0019] The length of the air duct 5 is determined according to the length of the wind turbine blade 1 (generally between 12 and 30 meters), and the heat flow of the heating body is transported to the blade tip through the air duct. The present invention has the following advantages:

[0020] 1. The heater 6 is a high-power device composed of multiple groups of heating elements 8, generally around 30-50KW. The PTC heating element is characterized by being a wind-supply type heating element. When there is no wind passing through the element, its heating power is only 10% of the rated power. The rated power can only be reached when the wind speed passing through the element is greater than 5m / s. The heat absorption heating device solves the problem of evenly receiving wind through each heating element in the heating box, making the three-phase current very balanced during the working process.

[0021] 2. This device solves the problem of resistance attenuation of multiple groups of heating body fans and improves the power of the heating body at the same time. The heat absorption deicing heating device has basically no loss of fan pressure under the conditions of the same fan parameters, reducing the wind resistance during fan operation. In addition, due to the heat absorption method, the temperature of the heating body shell is the same as the ambient temperature, with basically no heat loss, thereby improving the thermal utilization efficiency of the heating body.

[0022] 3. This device saves installation space in the inner cavity of the blade and meets the requirements of deicing blade installation in all processes.

[0023] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A wind turbine blade heat absorption gas heat deicing device, characterized in that: include: A blade (1), wherein two webs (2) are fixedly connected to the inner cavity of the blade (1), the two webs (2) are arranged in parallel, and the two webs (2) extend toward the tip of the blade (1), a bracket (3) is fixedly connected to the inner cavity of the blade (1), the bracket (3) is located at the end of the web (2), the bracket (3) is arranged close to the root of the blade (1), a fan (4) is fixedly connected to the bracket (3), an air duct (5) is fixedly connected to the air outlet end of the fan (4), the fan (4) is communicated with the air duct (5), and a heater (6) is fixedly connected to the air inlet end of the fan (4), and the heater ( 6) comprises an outer shell (7), a plurality of heating elements (8) are fixedly connected to the outer shell (7), a conical cylinder (9) is fixedly connected to the outer shell (7), the smaller end of the conical cylinder (9) is connected to the air inlet end of the fan (4), the outer shell (7), the conical cylinder (9) and the fan (4) are connected to each other, a wind blocker (10) is arranged in the inner cavity of the blade (1), the wind blocker (10) is fixedly connected to the side wall of the inner cavity of the blade (1) and the web (2), the air duct pipe (5) passes through the wind blocker (10), and the air duct pipe (5) is fixedly connected to the wind blocker (10).

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