A wind turbine nacelle cover with multiple protection structures

Abstract

The present invention relates to the technical field of wind turbines, and discloses a wind turbine nacelle with a multiple protection structure, comprising: a nacelle shell, a tail heat exhaust hood is fixed at the edge of the outer wall of the tail end, and a fireproof isolation hood is installed at the middle position of the tail end of the nacelle shell by bolt positioning; and also comprising: an air intake net, which is obliquely installed at the air inlet of the tail heat exhaust hood, and the interior of the tail heat exhaust hood is provided with a first vortex chamber and a second vortex chamber from bottom to top, the bottom of the first vortex chamber is provided with a first row of waste ports, and a second row of waste ports is also provided between the second vortex chamber and the first vortex chamber, and the top of the second vortex chamber is connected to the interior of the nacelle shell through an air intake hole. The wind turbine nacelle with a multiple protection structure utilizes the air convection of the wind turbine unit in high-altitude operation to form a vortex air pressure, isolate dust and realize heat exhaust and cooling inside the unit, and can also provide flame retardant and fire protection for the unit.

Description

Technical Field

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

[0002] The wind turbine nacelle cover is an external protective component for wind turbines and is also a connecting component for the blades and column components of wind turbines. Due to the large size of wind turbines, their assembly in conventional applications needs to meet the requirements of good anti-corrosion, anti-ultraviolet and other isolation and protection effects, so that the wind turbine can operate normally in harsh meteorological environments. It has many accessories and is arranged in a combined structure to form an organic whole for application.

[0003] In order to reduce the impact of the external environment, the existing wind turbine nacelle generally adopts an isolated structural combination application. However, due to its isolated sealed assembly combination application, its internal heat dissipation efficiency is poor during use, and it is necessary to install active heat dissipation accessories. Through the combined installation of heat dissipation components, cold and hot conversion is performed to achieve a continuous cooling effect during use;

[0004] However, the use of active heat dissipation accessories further increases the size and application cost of the cabin cover. At the same time, the stacked installation of heat dissipation accessories causes a large amount of available space inside the cabin cover to be occupied, which easily leads to heat accumulation, making it difficult to effectively dissipate heat and cool down the cabin cover. It is also impossible to effectively utilize air convection in the air environment where the cabin cover is located to isolate dust while accelerating heat dissipation.

[0005] In view of the above problems, it is urgent to carry out innovative design based on the original wind turbine nacelle cover. Summary of the invention

[0006] The purpose of the present invention is to provide a wind turbine nacelle cover with a multiple protection structure to solve the problem that the existing wind turbine nacelle cover proposed in the above background technology is easy to form heat energy accumulation, it is difficult to effectively discharge heat and cool down the air fundamentally, and it is impossible to effectively utilize the air convection in the air environment where the nacelle cover is located to isolate dust and accelerate heat dissipation.

[0007] To achieve the above object, the present invention provides the following technical solution: a wind turbine nacelle cover with a multiple protection structure, comprising:

[0008] The cabin cover shell has a tail heat exhaust cover fixed at the edge of the outer wall at the tail end, and a fireproof isolation cover is installed at the middle position of the tail end of the cabin cover shell by bolt positioning;

[0009] It also includes: an air intake net, which is installed at an angle at the air inlet of the tail heat exhaust cover, and the interior of the tail heat exhaust cover is provided with a first vortex chamber and a second vortex chamber from bottom to top, a first row of waste outlets is provided at the bottom of the first vortex chamber, and a second row of waste outlets is provided between the second vortex chamber and the first vortex chamber, and at the same time, the top of the second vortex chamber is communicated with the interior of the cabin cover shell through the air intake hole.

[0010] Preferably, an elastic band is provided between the outer edge of the air intake net and the air inlet of the rear heat exhaust cover, and the air intake net and the rear heat exhaust cover are positioned by positioning spring strips distributed at equal intervals, and a paddle is also fixed on the positioning spring strips.

[0011] Preferably, the first vortex chamber is opened in a vortex shape, the air outlet of the first vortex chamber is tangent to the air inlet of the second vortex chamber, and a rubber strip is fixed at the incision position of the air inlet of the second vortex chamber.

[0012] Preferably, a baffle is provided directly below the second row of waste outlets between the first vortex chamber and the second vortex chamber, and the baffle is inclined downward below the second row of waste outlets and is used for one-way waste discharge from the second row of waste outlets to the first vortex chamber.

[0013] Preferably, a positioning tube is provided on the fireproof isolation cover, and the positioning tube passes through the cabin cover shell. A gas tank and a control starting component of the gas tank are installed in the fireproof isolation cover, and the inert gas inside the gas tank is discharged into the cabin cover shell to isolate oxygen, thereby achieving isolation and flame retardancy.

[0014] Preferably, the control starting component includes a control switch on the gas tank, which controls the discharge of gas inside the gas tank. A movable support foot is movably installed on the control switch, and the movable support foot is connected to a hook on an adjusting rod. The adjusting rod extends to the interior of the rear end of the cabin cover shell, and a fixing positioning component for the adjusting rod is provided inside the rear end of the cabin cover shell to control the fixing positioning of the adjusting rod.

[0015] Preferably, the fastening positioning component includes a fastening cable with its head end positioned and installed at an inner corner of the cabin cover shell, the fastening cable is steered by a guide wheel, and a pressure baffle is connected between the ends of the fastening cable via an elastic member, and the pressure baffle is squeezed and positioned with the end of the adjusting rod.

[0016] Preferably, the end of the adjusting rod is provided with a spherical shape, and the spherical end of the adjusting rod is correspondingly fitted with the groove on the back side of the pressure baffle, and the fastening rope and the elastic member are arranged in a taut state.

[0017] Preferably, the adjusting rod is composed of a screw rod and a pushing rod, and the screw rod and the pushing rod are coaxially distributed laterally to form a through relative telescopic structure, and elastic parts are fixed at the sliding and telescopic positions of the two, and a spherical shape is provided at the end of the pushing rod, and a pull hook is fixed on the side wall of the pushing rod, and the pull hook and the outer wall of the end of the screw rod are through sliding installations.

[0018] Preferably, the screw rod is arranged to penetrate the middle part of the front side of the fireproof isolation cover, and an adjustment cylinder is rotatably installed at the installation point where the fireproof isolation cover and the screw rod penetrate and penetrate, the adjustment cylinder is threadedly connected to the screw rod, and a locking piece is fixed to the middle part of the adjustment cylinder located in the fireproof isolation cover, and the locking piece is used for sliding limit control of the movable support leg.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the wind turbine nacelle cover with multiple protection structures utilizes the air convection of the wind turbine unit at high altitude to form swirling air pressure, isolate dust and realize heat removal and cooling inside the unit, and at the same time can also provide flame retardant and fire protection for the unit. The specific contents are as follows:

[0020] 1. It only needs to be positioned at high altitude through the shell of the cabin cover and installed at the tail heat exhaust cover at its tail. In the high altitude, due to the collision of cold and hot air currents, a fast-flowing airflow is formed. The airflow passes through the outside of the cabin cover shell. Due to the kinetic energy of the air, a swirling airflow under the action of air pressure will be formed in the area where the tail heat exhaust cover is located, so that the gas is pressurized and introduced into the interior of the tail heat exhaust cover from the position where the air inlet net is located. Due to the distribution of the first swirling cavity, the second swirling cavity, the first and second waste ports inside the tail heat exhaust cover, the pressurized airflow generates a swirling force in the tail heat exhaust cover. In the swirling process, the centrifugal external force is used to multiple separate the dust in the airflow, and the clean, small amount of airflow is continuously introduced into the cabin cover shell to form heat exhaust, thereby preventing the heat storage and high-temperature heat loss of its application;

[0021] Furthermore, at the positioning installation position of the air intake net, a positioning spring bar and a paddle are provided for connection. When the air intake net is installed to filter the particulate impurities in the preliminary fixed airflow, the positioning spring bar and the paddle connected and positioned by the air intake net generate continuous high-frequency oscillation due to the impact of the high-altitude airflow, which can effectively discharge the impurities filtered and accumulated on the air intake net, and prevent them from causing continuous clogging of the filter mesh holes.

[0022] 2. The static balance of the fastening cable, elastic parts, pressure baffle and adjusting rod is used to limit the movement of the adjusting rod and the control switch and movable support leg connected thereto. When the wind turbine is in normal operation, the static balance stabilizes the unit. When the wind turbine generates internal high temperature and burns, the fastening cable breaks due to the high temperature, destroying the static balance of the control switch and the movable support leg, and opening the gas tank to discharge the inert gas inside, isolating the oxygen to achieve a flame retardant effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the front structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the back structure of the present invention;

[0025] Figure 3This is a schematic diagram of the structure of the tail heat exhaust cover of the present invention;

[0026] Figure 4 This is a schematic diagram of the internal structure of the tail heat exhaust cover of the present invention;

[0027] Figure 5 This is a schematic diagram of the installation structure of the air intake network of the present invention;

[0028] Figure 6 This is a schematic diagram of the positioning spring structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the fireproof isolation cover of the present invention;

[0030] Figure 8 This is a schematic diagram of the front structure of the fireproof isolation cover and the cabin cover shell docking of the present invention;

[0031] Fig. 9 It is a schematic diagram of the back structure of the fireproof isolation cover and the cabin cover shell docking of the present invention;

[0032] Fig.10 It is a schematic diagram of the connection structure between the pressure baffle and the adjustment rod of the present invention;

[0033] Fig.11 This is a schematic diagram of the internal structure of the fireproof isolation cover of the present invention from a top view;

[0034] Fig.12 It is a schematic diagram of the structure of the adjusting rod of the present invention;

[0035] Fig.13 It is a schematic diagram of the installation distribution structure of the adjustment cylinder and the locking member of the present invention.

[0036] In the figure: 1. cabin cover shell; 2. tail heat exhaust cover; 3. fireproof isolation cover; 301. positioning tube; 4. air intake net; 401. positioning spring strip; 402. paddle; 5. first vortex chamber; 6. first row of waste outlets; 7. second vortex chamber; 8. rubber strip; 9. second row of waste outlets; 10. air inlet; 11. adjusting rod; 1101. screw rod; 1102. propulsion rod; 1103. hook; 12. pressure baffle; 13. fastening rope; 14. elastic member; 15. gas tank; 16. control switch; 17. movable support foot; 18. adjusting cylinder; 19. locking member. DETAILED DESCRIPTION

[0037] 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.

[0038] Example 1: Please refer to Figure 1-Figure 6 The present invention provides a technical solution: a wind turbine nacelle cover with a multiple protection structure, comprising:

[0039] The cabin cover shell 1 has a tail heat exhaust cover 2 fixed at the edge of the outer wall of the tail end, and a fireproof isolation cover 3 is fixed by bolts at the middle position of the tail end of the cabin cover shell 1, and the fireproof isolation cover 3 is used for fire prevention and flame retardancy when the wind turbine is in use;

[0040] It also includes: an air intake net 4, which is obliquely installed at the air inlet of the tail heat exhaust cover 2, and the interior of the tail heat exhaust cover 2 is provided with a first vortex chamber 5 and a second vortex chamber 7 from bottom to top, a first row of waste ports 6 is provided at the bottom of the first vortex chamber 5, and a second row of waste ports 9 is provided between the second vortex chamber 7 and the first vortex chamber 5, and at the same time, the top of the second vortex chamber 7 is connected to the interior of the cabin cover shell 1 through an air inlet hole 10; the first vortex chamber 5 is opened in a vortex shape, the air outlet of the first vortex chamber 5 is tangent to the air inlet of the second vortex chamber 7, and a rubber strip 8 is fixed at the incision position of the air inlet of the second vortex chamber 7; a baffle is provided directly below the second row of waste ports 9 between the first vortex chamber 5 and the second vortex chamber 7, and the baffle is inclined downward below the second row of waste ports 9, and is used for one-way waste discharge from the second row of waste ports 9 to the first vortex chamber 5;

[0041] like Figure 1-Figure 4 As shown, the cabin cover shell 1 is installed and positioned at a high altitude. During air convection at a high altitude, the airflow is guided and transported by the curved surface of the outer wall of the cabin cover shell 1, and the airflow swirls under the action of air pressure at the tail position of the cabin cover shell 1. The swirling airflow is introduced into the interior of the tail heat exhaust cover 2 through the air inlet at the position of the air inlet net 4, and the gas is pressurized and introduced. The airflow swirls once in the first swirl chamber 5 to separate impurities in the airflow. At the same time, the separated airflow is introduced into the second swirl chamber 7 through the air inlet, and the glue at the air inlet position of the second swirl chamber 7 is Under the action of the strip 8, the impurities are further separated by the impact action, and the airflow introduced into the second vortex chamber 7 is discharged in the same way. The impurities after the discharge are discharged through the second discharge port 9 and the first discharge port 6 in turn, and a small amount of slow clean airflow is introduced into the cabin cover shell 1 to drive the heat discharge, so that the accumulated temperature is discharged here. In order to ensure the stability of the air pressure inside the cabin cover shell 1, a one-way air valve can be arranged on the outer wall of the cabin cover shell 1. Due to the exhaust operation, the heat discharge operation is used to maintain the internal temperature of the wind turbine set stable during normal operation;

[0042] Also adopt Figure 5 and Figure 6In the technical solution shown, an elastic band is provided between the outer edge of the air inlet net 4 and the air inlet of the rear heat exhaust cover 2, and the air inlet net 4 and the rear heat exhaust cover 2 are positioned by positioning spring strips 401 distributed at equal intervals, and a paddle 402 is also fixed on the positioning spring strips 401; an elastic band is provided between the outer edge of the air inlet net 4 and the air inlet of the rear heat exhaust cover 2, and the air inlet net 4 and the rear heat exhaust cover 2 are positioned by positioning spring strips 401 distributed at equal intervals, and a paddle 402 is also fixed on the positioning spring strips 401;

[0043] In the present technical solution, the air intake net 4 is used to preliminarily filter the gas introduced into the air inlet of the rear heat exhaust cover 2. At the same time, since the air intake net 4 continuously filters impurities, the filter holes thereon are easily blocked by impurities. Through the installation and positioning of the positioning spring strip 401, the positioning spring strip 401 and the paddle 402 have rigidity and toughness for use. When the air intake net 4 is installed and positioned, when the airflow impacts the positioning spring strip 401 and the paddle 402, it can produce high-frequency oscillation of the airflow impact operation, thereby driving the air intake net 4 to vibrate and discharge the impurities contaminated thereon.

[0044] Embodiment 2: This embodiment is based on embodiment 1 and adopts Figure 7-Figure 13 As shown, the fireproof isolation cover 3 and other structures are further disclosed, which can be flame-retardant and fire-proofed when the wind turbine is in use at high temperature and burning. The specific contents are as follows:

[0045] A positioning tube 301 is provided on the fireproof isolation cover 3, and the positioning tube 301 penetrates into the cabin cover shell 1. A gas cylinder 15 and a control starting component of the gas cylinder 15 are installed in the fireproof isolation cover 3, and the inert gas inside the gas cylinder 15 is discharged into the cabin cover shell 1 to isolate oxygen, thereby realizing isolation and flame retardancy and fire prevention; the control starting component includes a control switch 16 on the gas cylinder 15, and the control switch 16 controls the discharge of gas inside the gas cylinder 15. A movable support foot 17 is movably installed on the control switch 16, and the movable support foot 17 is connected to the hook 1103 on the adjusting rod 11. The adjusting rod 11 penetrates into the interior of the rear end of the cabin cover shell 1, and a fixing positioning component of the adjusting rod 11 is provided inside the rear end of the cabin cover shell 1 to control the fixing position of the adjusting rod 11; the fixing positioning component includes a fastening rope 1 positioned at the inner corner position of the cabin cover shell 1, and the head end is positioned and installed 3. The tightening cable 13 is controlled by steering through the guide wheel. The ends of the tightening cable 13 are connected with a pressure baffle 12 through an elastic member 14. The pressure baffle 12 is squeezed and positioned with the end of the adjusting rod 11. The end of the adjusting rod 11 is provided with a spherical shape, and the spherical end of the adjusting rod 11 is correspondingly fitted with the groove on the back of the pressure baffle 12. The tightening cable 13 and the elastic member 14 are set in a tight state. The adjusting rod 11 is composed of a screw rod 1101 and a push rod 1102. The screw rod 1101 and the push rod 1102 are coaxially distributed in the transverse direction to form a relative telescopic structure that penetrates. The elastic member is fixed at the sliding and telescopic position of the two, and the end of the push rod 1102 is provided with a spherical shape. A hook 1103 is fixed on the side wall of the push rod 1102. The hook 1103 and the outer wall of the end of the screw rod 1101 are installed in a penetrating sliding manner.

[0046] In the above technical scheme, firstly, the installation and positioning method of the fireproof isolation cover 3 is disclosed. The fireproof isolation cover 3 is positioned by bolt installation. The fireproof isolation cover 3 and the positioning tube 301 thereon are inserted into the tail of the cabin cover shell 1, and a sealing ring structure is installed at its insertion position, and the adjusting rod 11 is inserted through the middle of the adjusting cylinder 18. The adjustment rod 11 is controlled to extend and retract by rotating the adjusting cylinder 18 and connecting it with the threaded inner part of the adjusting rod 11, so that the adjusting rod 11 penetrates into the interior of the positioning tube 301 and the cabin cover shell 1, and the spherical structure at the end of the adjusting rod 11 and the groove structure on the back of the pressure baffle 12 are correspondingly fitted and squeezed, so that the fastening cable 13 and the elastic member 14 are deformed and tightened due to the pushing force of the pressure baffle 12, so as to achieve the effect of static balance between the fastening cable 13 and the elastic member 14 and the pressure baffle 12 and the adjusting rod 11;

[0047] When high temperature and burning are generated inside the cabin cover shell 1, the high temperature and open flame cause the uniformly distributed fastening cables 13 to melt and break individually or completely. The fastening cables 13 can be made of elastic fiber wires or hot melt wires. The breaking of individual or all fastening cables 13 destroys the equilibrium state formed by the fastening cables 13 and the elastic member 14, causing the pressure baffle 12 to move and no longer limit the end of the adjusting rod 11. When the adjusting rod 11 is not limited by it, the elastic member compressed inside it is reset due to elasticity, so that the propulsion rod 1102 and the hook 1103 are away from the screw. 1101 moves, and at the same time, the hook 1103 causes the movable support leg 17 to change its position during the movement. The movement of the movable support leg 17 causes the control switch 16 to open the tank mouth switch of the gas cylinder 15. The movement of the movable support leg 17 can be achieved by using a pressure sensor to control the operation of the control switch 16 during the movement and pressure process; the movable support leg 17 can also be used to move quickly and impact, and under the action of the collision external force, the high-speed impact is used to form an effect of igniting the gunpowder to open the tank mouth of the gas cylinder 15, and the inert gas inside the gas cylinder 15 is discharged and introduced into the cabin cover shell 1, so as to achieve the flame retardant and fireproof effect.

[0048] Embodiment 3: Based on Embodiment 2, this embodiment further discloses an anti-accidental opening structure of the control switch 16 on the gas cylinder 15 to prevent the gas cylinder 15 from discharging inert gas due to the free movement of the movable legs 17 when the fireproof isolation cover 3 is installed and positioned, thereby causing damage to its subsequent flame retardant function. The specific contents are as follows:

[0049] The adjusting rod 11 is composed of a screw rod 1101 and a push rod 1102. The screw rod 1101 and the push rod 1102 are coaxially distributed in the transverse direction, forming a relative telescopic structure that penetrates. Elastic parts are fixed at the sliding and telescopic positions of the two, and a spherical shape is provided at the end of the push rod 1102. A hook 1103 is fixed on the side wall of the push rod 1102. The hook 1103 and the outer wall of the end of the screw rod 1101 are installed in a penetrating sliding manner; the screw rod 1101 is installed in the middle of the front of the fireproof isolation cover 3, and an adjusting cylinder 18 is rotatably installed at the installation point where the fireproof isolation cover 3 and the screw 1101 penetrate, and the adjusting cylinder 18 is threadedly connected to the screw rod 1101, and a locking member 19 is fixed to the middle of the adjusting cylinder 18 located in the fireproof isolation cover 3, and the locking member 19 is used for sliding limit control of the movable support leg 17;

[0050] In the above technical scheme, the locking member 19 on the adjusting cylinder 18 works, and the locking member 19 uses the drum and the silk thread wound thereon to pull and position the movable support leg 17 to prevent the movable support leg 17 from moving freely. When the adjusting cylinder 18 rotates to drive the adjusting rod 11 to move its position, the adjusting cylinder 18 during the rotation process causes the locking member 19 to rotate in the opposite direction to loosen the silk thread wound thereon, thereby achieving the effect of releasing the original limit of the movable support leg 17. When the subsequent pull hook 1103 and the push rod 1102 move, the movable support leg 17 can be driven to move synchronously.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A wind turbine nacelle cover with a multiple protection structure, comprising: A cabin cover shell (1) has a rear heat exhaust cover (2) fixed to the edge of the rear end outer wall thereof, and a fireproof isolation cover (3) is fixedly mounted at the middle position of the rear end of the cabin cover shell (1) by means of bolts; It is characterized by further comprising: An air intake net (4) is obliquely installed at the air intake of the tail heat exhaust cover (2), and the interior of the tail heat exhaust cover (2) is provided with a first vortex chamber (5) and a second vortex chamber (7) from bottom to top, a first waste outlet (6) is provided at the bottom of the first vortex chamber (5), and a second waste outlet (9) is provided between the second vortex chamber (7) and the first vortex chamber (5), and the top of the second vortex chamber (7) is connected to the interior of the cabin cover shell (1) through an air intake hole (10); A gas tank (15) and a control start component of the gas tank (15) are installed in the fireproof isolation cover (3), wherein the control start component comprises a control switch (16) on the gas tank (15), wherein a movable support foot (17) is movably installed on the control switch (16), wherein the movable support foot (17) is connected to a hook (1103) on an adjustment rod (11), wherein the adjustment rod (11) extends through the interior of the rear end of the cabin cover shell (1), and wherein the interior of the rear end of the cabin cover shell (1) is provided with a fastening positioning component for the adjustment rod (11); wherein the fastening positioning component comprises a fastening cable (13) whose head end is positioned and installed at an inner corner position of the cabin cover shell (1), wherein a pressure baffle (12) is connected between the ends of the fastening cable (13) via an elastic member (14), and wherein the pressure baffle (12) is positioned with respect to the end of the adjustment rod (11) by means of an extrusion.

2. The wind turbine nacelle cover with a multiple protection structure according to claim 1, characterized in that: An elastic band is provided between the outer edge of the air intake net (4) and the air intake of the rear heat exhaust cover (2), and the air intake net (4) and the rear heat exhaust cover (2) are positioned by positioning spring strips (401) distributed at equal intervals, and a paddle (402) is also fixed on the positioning spring strips (401).

3. A wind turbine nacelle cover with a multiple protection structure according to claim 1 or 2, characterized in that: The first vortex chamber (5) is opened in a vortex shape, the air outlet of the first vortex chamber (5) is tangent to the air inlet of the second vortex chamber (7), and a rubber strip (8) is fixed at the incision position of the air inlet of the second vortex chamber (7).

4. The wind turbine nacelle cover with a multiple protection structure according to claim 3, characterized in that: A baffle is provided directly below the second row of waste openings (9) between the first vortex chamber (5) and the second vortex chamber (7), the baffle being inclined downward below the second row of waste openings (9) and used for one-way waste discharge from the second row of waste openings (9) to the first vortex chamber (5).

5. The wind turbine nacelle cover with a multiple protection structure according to claim 1, characterized in that: The fireproof isolation cover (3) is provided with a positioning tube (301), and the positioning tube (301) penetrates into the shell of the cabin cover (1); The start-up component is controlled to discharge the inert gas inside the gas tank (15) into the cabin cover shell (1), thereby isolating oxygen and achieving isolation and flame retardancy.

6. The wind turbine nacelle cover with multiple protection structures according to claim 1, characterized in that: The control switch (16) controls the discharge of gas inside the gas tank (15), and the fastening and positioning component controls the fastening and positioning of the adjustment rod (11).

7. The wind turbine nacelle cover with multiple protection structures according to claim 6, characterized in that: The fastening rope (13) is controlled by steering via a guide wheel.

8. The wind turbine nacelle cover with a multiple protection structure according to claim 7, characterized in that: The end of the adjusting rod (11) is provided with a spherical shape, and the spherical end of the adjusting rod (11) is correspondingly fitted with a groove on the back of the pressure baffle (12), and the fastening rope (13) and the elastic member (14) are arranged in a tight state.

9. A wind turbine nacelle with a multiple protection structure according to any one of claims 6-7, characterized in that: The adjusting rod (11) is composed of a screw rod (1101) and a pushing rod (1102). The screw rod (1101) and the pushing rod (1102) are coaxially arranged in a transverse direction to form a through-going relative telescopic structure. An elastic member is fixed at the sliding and telescopic position of the two rods. A spherical shape is provided at the end of the pushing rod (1102). A draw hook (1103) is fixed on the side wall of the pushing rod (1102). The draw hook (1103) and the outer wall of the end of the screw rod (1101) are through-going sliding installations.

10. The wind turbine nacelle cover with multiple protection structures according to claim 9, characterized in that: The screw rod (1101) is arranged to penetrate the middle part of the front side of the fireproof isolation cover (3), and an adjustment cylinder (18) is rotatably installed at the penetration installation position of the fireproof isolation cover (3) and the screw rod (1101). The adjustment cylinder (18) is threadedly connected to the screw rod (1101), and a locking member (19) is fixed to the middle part of the adjustment cylinder (18) located inside the fireproof isolation cover (3). The locking member (19) is used for sliding limit control of the movable support foot (17).

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