Fireproof wind generating set cabin cover

Abstract

The invention relates to the technical field of wind generating sets, and discloses a fireproof wind generating set cabin cover which comprises a cabin cover body internally provided with a threaded column. The fireproof plate is mounted on the inner surface of the cabin cover and connected with the cabin cover through a threaded column to form a fireproof layer; the air layer is located between the fireproof plate and the inner surface of the cabin cover, and the thickness of the air layer is determined by the height of the threaded column; the air layer delays heat transfer to the cabin cover through the low heat conductivity coefficient of air. According to the fireproof type wind generating set cabin cover, the cabin cover is separated from the interior of a set through the air layer between the fireproof plate and the cabin cover, the cabin cover is prevented from making direct contact with flames when a fire occurs, the time for glass fiber reinforced plastic to reach an ignition point is delayed, time is bought for fire extinguishing of the set, and the situation that the cabin cover is ignited and spreads to the whole set is avoided; and the fireproof performance of the wind generating set is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine generator sets, and in particular to a fireproof wind turbine generator set nacelle cover. Background Art

[0002] As a key external protective structure of wind turbines, the nacelle has the following main functions: protecting against dust, rain, snow, salt spray erosion, and UV aging, ensuring stable operation of the unit in various harsh environments.

[0003] However, the nacelle cover made of flame-retardant fiberglass, which is commonly used in wind turbines, poses a safety hazard when faced with emergencies such as lightning strikes or fires in internal electrical components. Specifically, once the flame directly contacts the nacelle cover and the temperature reaches its ignition point, the nacelle cover may catch fire. Especially under the action of a continuous open flame, the ignition point temperature of the nacelle cover will drop rapidly, causing the fire to spread rapidly.

[0004] Therefore, when a serious fire occurs inside a wind turbine, such as a transformer fire, existing automatic fire extinguishers are often unable to effectively extinguish the fire, causing the fire to get out of control further and eventually ignite the nacelle cover, causing the entire wind turbine to burn. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention proposes a fireproof wind turbine nacelle cover to solve the above technical problems.

[0006] A fireproof wind turbine nacelle cover, comprising:

[0007] a nacelle cover with threaded posts inside;

[0008] The fireproof board is installed on the inner surface of the nacelle cover and connected to the nacelle cover through threaded columns to form a fireproof layer;

[0009] The air layer, located between the fireproof plate and the inner surface of the nacelle cover, has a thickness determined by the height of the threaded post;

[0010] Among them, the air layer uses the low thermal conductivity of air to delay the transfer of heat to the cabin cover.

[0011] Furthermore, a bolt hole is provided on the fireproof plate, and the bolt hole is arranged in cooperation with the threaded column.

[0012] Furthermore, the cabin cover and the fireproof panel are provided in plurality.

[0013] Furthermore, it also includes a plurality of corner fireproof panels and internal reinforcement rib fireproof panels, and the plurality of cabin covers are connected through the corner fireproof panels and the internal reinforcement rib fireproof panels.

[0014] Furthermore, the fireproof board is made of non-metallic material.

[0015] Furthermore, the heat transfer coefficient of the inner surface of the fireproof board is determined by the method shown in the following formula:

[0016]

[0017] Where: h n is the heat transfer coefficient of the inner surface of the fireproof board, λ1 is the thermal conductivity of the air in the cabin under specific working conditions, L1 is the characteristic length of the inner surface of the fireproof layer, and Nu1 is the Nusselt coefficient of the inner surface of the fireproof layer.

[0018] Furthermore, the heat transfer coefficient of the outer surface of the nacelle cover is determined by the method shown in the following formula:

[0019]

[0020] Where: h w is the heat transfer coefficient of the outer surface of the nacelle cover, λ2 is the thermal conductivity of the air outside the cabin under specific external environmental conditions, L2 is the characteristic length of the outer surface of the nacelle cover, and Nu2 is the Nusselt coefficient of the outer surface of the nacelle cover.

[0021] Furthermore, the comprehensive thermal resistance is determined by the method shown in the following formula:

[0022]

[0023] Where: R is the comprehensive thermal resistance, δ is the thickness, λ is the thermal conductivity, λ3 is the thermal conductivity of the fireproof board, δ3 is the thickness of the fireproof board, λ4 is the thermal conductivity of the cabin cover, δ4 is the thickness of the cabin cover, R k is the air layer thermal resistance.

[0024] Furthermore, the heat transfer coefficient is determined by the method shown in the following formula:

[0025]

[0026] Where: K is the heat transfer coefficient.

[0027] Furthermore, the air layer thermal resistance is determined by the method shown in the following formula:

[0028]

[0029] Where: R k is the air layer thermal resistance, λ a is the thermal conductivity of air, λ r is the equivalent thermal conductivity of the radiation between two surfaces between air, λ c is the equivalent convective thermal conductivity of the air layer, and d is the thickness of the air layer.

[0030] The invention adopting the above technical solution has the following advantages:

[0031] 1. The present invention utilizes the air layer between the fireproof plate and the nacelle cover to separate the nacelle cover from the inside of the unit, thereby preventing the nacelle cover from directly contacting the flame when a fire occurs, delaying the time for the fiberglass to reach the fire point, buying time for the unit to extinguish the fire, preventing the nacelle cover from spreading to the entire unit, and improving the fireproof performance of the wind turbine generator set.

[0032] 2. The present invention increases the overall thermal resistance of the structure and reduces the heat transfer coefficient by adding fireproof boards and air layers, thereby achieving the effect of heat insulation and fire prevention. Under the same environmental conditions, the thermal resistance of the heat transfer structure can be further increased and the heat transfer coefficient can be reduced by increasing the thickness of the fireproof board, reducing the thermal conductivity of the fireproof board material, and increasing the thickness of the air layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation of the present invention, the following will briefly introduce the drawings required for use in the specific implementation. In all the drawings, each element or part is not necessarily drawn according to the actual scale.

[0034] Figure 1 This is a structural schematic diagram of a fireproof wind turbine nacelle cover of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of an air layer in a nacelle cover of a fireproof wind turbine generator set according to the present invention;

[0036] Figure 3 It is a structural schematic diagram of a fireproof plate at a corner and a reinforcing rib fireproof plate in a fireproof wind turbine nacelle cover of the present invention;

[0037] Figure 4 It is a structural schematic diagram of a fireproof plate at a corner and a fireproof plate at a flange in a nacelle cover of a fireproof wind turbine generator set according to the present invention;

[0038] Figure 5 The present invention is a schematic structural diagram of a wire threading hole reserved in a nacelle cover of a fireproof wind turbine generator set.

[0039] Reference numerals:

[0040] Nacelle cover 1, threaded column 2, fireproof board 3, air layer 4, fireproof board at corner 5, fireproof board at reinforcement 6, fireproof board at flange 7, reserved threading hole 8. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0042] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should be the common meanings understood by technicians in the field to which the present invention belongs. The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to implement the embodiments of the present disclosure described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. Unless otherwise specified, the term "multiple" means two or more. In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B. The term "and / or" is a description of the association relationship of objects, indicating that there can be three relationships. For example, A and / or B means: A or B, or, A and B. The term "corresponding" can refer to an association relationship or a binding relationship, and A and B correspondingly refer to an association relationship or a binding relationship between A and B.

[0043] like Figure 1 to Figure 5 As shown, a fireproof wind turbine generator nacelle cover 1 of the present invention comprises:

[0044] The nacelle cover 1 is provided with a threaded column 2 inside, and the number of the threaded column 2 (which may also be replaced by other structures) is multiple;

[0045] The fireproof board 3 is installed on the inner surface of the engine nacelle cover 1 and is fixedly connected to the engine nacelle cover 1 through the threaded column 2 to form a fireproof layer;

[0046] An air layer 4, located between the fireproof plate 3 and the inner surface of the nacelle cover 1, the thickness of which is determined by the height of the threaded column 2;

[0047] The air layer 4 utilizes the low thermal conductivity of air to delay the transfer of heat to the nacelle cover 1 .

[0048] Specifically, the air layer 4 between the fireproof plate 3 and the nacelle cover 1 is used to separate the nacelle cover 1 from the interior of the unit, so as to prevent the nacelle cover 1 from directly contacting the flame when a fire occurs, delay the time for the fiberglass to reach the fire point, buy time for the unit to extinguish the fire, prevent the fire of the nacelle cover 1 from spreading to the entire unit, and improve the fire resistance of the wind turbine generator set.

[0049] In some embodiments, bolt holes are provided on the fireproof board 3 , and the number of the bolt holes is also multiple, and the bolt holes are arranged in coordination with the threaded columns 2 .

[0050] Specifically, it is used to ensure that the fireproof board 3 is firmly installed.

[0051] In some embodiments, the cabin cover 1 and the fireproof panel 3 are both provided in plurality.

[0052] Specifically, it is used to adapt to the needs of wind turbines of different sizes and shapes.

[0053] In some embodiments, multiple corner fireproof panels 5 and internal reinforcement rib fireproof panels 6 are also included, and multiple cabin covers 1 are connected through the corner fireproof panels 5 and the internal reinforcement rib fireproof panels 6.

[0054] Specifically, it is used to connect multiple nacelle covers 1 to ensure the integrity and stability of the structure of the entire nacelle cover 1.

[0055] In some embodiments, a plurality of fireproof panels 7 at the flanges are also included, and the fireproof panels 7 at the flanges are connected to the fireproof panels 5 at the corners.

[0056] Specifically, fire protection of the flange area is achieved.

[0057] In some embodiments, a reserved threading hole 8 is provided on the fireproof board 3 .

[0058] Specifically, it is used to pass through connecting wires such as cables to ensure the normal operation of the unit.

[0059] In some embodiments, the fireproof board 3 is made of non-metallic material.

[0060] Specifically, the fireproof board 3 can be a flat plate made of flame-retardant non-metallic materials such as calcium silicate (silicate) fireproof board 3 and high-temperature mold insulation board, or a sheet metal part or welded part made of metal materials with low thermal conductivity such as ordinary steel plate and aluminum-zinc-coated steel plate. The fireproof board of the present invention has various materials, and non-metallic materials or metal materials with low thermal conductivity can be selected according to actual needs, thereby improving the adaptability and durability of the cabin cover.

[0061] In some embodiments, the heat transfer coefficient of the inner surface of the fireproof board is determined by the method shown in the following formula:

[0062]

[0063] Where: h n is the heat transfer coefficient of the inner surface of the fireproof board, λ1 is the thermal conductivity of the air in the cabin under specific working conditions, L1 is the characteristic length of the inner surface of the fireproof layer, and Nu1 is the Nusselt coefficient of the inner surface of the fireproof layer.

[0064] In some embodiments, the heat transfer coefficient of the outer surface of the nacelle cover is determined by the method shown in the following formula:

[0065]

[0066] Where: h wis the heat transfer coefficient of the outer surface of the nacelle cover, λ2 is the thermal conductivity of the air outside the nacelle under specific external environmental conditions, L2 is the characteristic length of the outer surface of the nacelle cover, and Nu2 is the Nusselt coefficient of the outer surface of the nacelle cover

[0067] In some embodiments, the comprehensive thermal resistance is determined by the method shown in the following formula:

[0068]

[0069] Where: R is the comprehensive thermal resistance, δ is the thickness, λ is the thermal conductivity, λ3 is the thermal conductivity of the fireproof board, δ3 is the thickness of the fireproof board, λ4 is the thermal conductivity of the cabin cover, δ4 is the thickness of the cabin cover, R k is the air layer thermal resistance.

[0070] In some embodiments, the heat transfer coefficient is determined by the following formula:

[0071]

[0072] Where: K is the heat transfer coefficient.

[0073] In some embodiments, the air layer thermal resistance is determined by the method shown in the following formula:

[0074]

[0075] Where: R k is the air layer thermal resistance, λ a is the thermal conductivity of air, λ r is the equivalent thermal conductivity of the radiation between two surfaces between air, λ c is the equivalent convective thermal conductivity of the air layer, and d is the thickness of the air layer.

[0076] Detailed calculation formulas are provided to help evaluate and optimize the thermal performance of fireproof nacelle covers, thereby improving product reliability and safety. Specific embodiments

[0078] Environmental conditions:

[0079]

[0080] Fire protection structure related parameters:

[0081]

[0082] The structure of the invention is simplified to a large outward-swept flat plate model for calculation, and the specific process is as follows:

[0083] (1) Heat transfer coefficient of inner surface of fireproof board Thermal conductivity: λ1 = 0.0272W / (m·K), characteristic length L1 = 1m, Nusselt coefficient calculated under the above environmental conditions is Nu1 = 145.1, and the heat transfer coefficient of the inner surface of the fireproof board is h n =3.95W / (m 2 K), thermal resistance

[0084] (2) Heat transfer coefficient of the outer surface of the nacelle cover Thermal conductivity: λ2 = 0.0267 W / (m·K), characteristic length L2 = 1 m, Nusselt coefficient calculated under the above environmental conditions is Nu1 = 789.2, and the heat transfer coefficient of the outer surface of the nacelle cover is h w =21.1, thermal resistance

[0085] (3) Thermal resistance of fireproof layer Thermal resistance of engine cover

[0086] Thermal conductivity of air in the air layer λ a =0.027W / (m·K), equivalent thermal conductivity of two surfaces between air λ r =0.00946W / (m·K), air layer convection equivalent thermal conductivity λ c =0.01685W / (m·K), air layer thermal resistance R k =0.75m 2 ·K / W.

[0087] Total thermal resistance of the structure described in the patent Comprehensive heat transfer coefficient K = 0.908W / (m 2 ·K).

[0088] The traditional non-fireproof and heat-insulating structure is simplified to a large flat plate model for calculation. The specific process is as follows:

[0089] (1) Heat transfer coefficient of the inner surface of the nacelle cover Thermal conductivity: λ1 = 0.0272 W / (m·K), characteristic length L1 = 1 m, Nusselt coefficient calculated under the above environmental conditions is Nu1 = 145.1, and the heat transfer coefficient of the inner surface of the nacelle cover is h n =3.95W / (m 2 K), thermal resistance

[0090] (2) Heat transfer coefficient of the outer surface of the nacelle cover Thermal conductivity: λ2 = 0.0267 W / (m·K), characteristic length L2 = 1 m, Nusselt coefficient calculated under the above environmental conditions is Nu1 = 789.2, and the heat transfer coefficient of the outer surface of the nacelle cover is h w =21.1W / (m2 K), thermal resistance

[0091] (3) Thermal resistance of the nacelle cover Total thermal resistance of traditional structure K / W, comprehensive heat transfer coefficient K = 2.85W / (m 2 ·K).

[0092] In summary, in this specific embodiment, the thermal resistance of the patented structure is 3.14 times that of the traditional structure, and the thermal insulation effect is significantly improved.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A fireproof wind turbine nacelle cover, characterized in that: include: a nacelle cover with threaded posts inside; The fireproof board is installed on the inner surface of the nacelle cover and connected to the nacelle cover through threaded columns to form a fireproof layer; The air layer, located between the fireproof plate and the inner surface of the nacelle cover, has a thickness determined by the height of the threaded post; Among them, the air layer uses the low thermal conductivity of air to delay the transfer of heat to the cabin cover.

2. The fireproof wind turbine nacelle cover according to claim 1, characterized in that: The fireproof plate is provided with a bolt hole, and the bolt hole is arranged in cooperation with the threaded column.

3. The fireproof wind turbine nacelle cover according to claim 2, characterized in that: The cabin cover and the fireproof plate are both provided in plurality.

4. The fireproof wind turbine nacelle cover according to claim 3, characterized in that: It also includes a plurality of fireproof panels at corners and fireproof panels at internal reinforcement ribs, and the plurality of cabin covers are connected through the fireproof panels at corners and fireproof panels at internal reinforcement ribs.

5. The fireproof wind turbine nacelle cover according to claim 1, characterized in that: The fireproof board is made of non-metallic material.

6. The fireproof wind turbine nacelle cover according to claim 1, characterized in that: The heat transfer coefficient of the inner surface of the fireproof board is determined by the method shown in the following formula: Where: h n is the heat transfer coefficient of the inner surface of the fireproof board, λ1 is the thermal conductivity of the air in the cabin under specific working conditions, L1 is the characteristic length of the inner surface of the fireproof layer, and Nu1 is the Nusselt coefficient of the inner surface of the fireproof layer.

7. The fireproof wind turbine nacelle cover according to claim 6, characterized in that: The heat transfer coefficient of the outer surface of the nacelle cover is determined by the method shown in the following formula: Where: h w is the heat transfer coefficient of the outer surface of the nacelle cover, λ2 is the thermal conductivity of the air outside the cabin under specific external environmental conditions, L2 is the characteristic length of the outer surface of the nacelle cover, and Nu2 is the Nusselt coefficient of the outer surface of the nacelle cover.

8. The fireproof wind turbine nacelle cover according to claim 7, characterized in that: The comprehensive thermal resistance is determined by the method shown in the following formula: Where: R is the comprehensive thermal resistance, δ is the thickness, λ is the thermal conductivity, λ3 is the thermal conductivity of the fireproof board, δ3 is the thickness of the fireproof board, λ4 is the thermal conductivity of the cabin cover, δ4 is the thickness of the cabin cover, R k is the air layer thermal resistance.

9. The fireproof wind turbine nacelle cover according to claim 8, characterized in that: The heat transfer coefficient is determined by the method shown in the following formula: Where: K is the heat transfer coefficient.

10. The fireproof wind turbine nacelle cover according to claim 9, characterized in that: The air layer thermal resistance is determined by the method shown in the following formula: Where: R k is the air layer thermal resistance, λ a is the thermal conductivity of air, λ r is the equivalent thermal conductivity of the radiation between two surfaces between air, λ c is the equivalent convective thermal conductivity of the air layer, and d is the thickness of the air layer.

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