Composite oil tank and wind power integrated system comprising same

Abstract

The application discloses a composite oil tank and a wind power integrated system containing the same, and belongs to the field of wind power generation equipment. The application comprises an oil tank body, a separation structure and an auxiliary component mounting support, the oil tank body has a containing cavity; the separation structure is arranged in the containing cavity and separates the oil tank body into a hydraulic oil cavity and a lubricating oil cavity which are independent of each other; the auxiliary component mounting support is connected to the oil tank body, the auxiliary component mounting support comprises an auxiliary component mounting platform which is located above the oil tank body, and the auxiliary component mounting platform and the oil tank body are arranged in a spaced mode to form a mounting space; the auxiliary component mounting platform is used for mounting auxiliary components of the composite oil tank. The application saves the total space occupied by the hydraulic oil tank and the lubricating oil tank, improves the compactness of a lubricating system, a cooling system and a hydraulic braking system, fully utilizes the space on the upper layer of the oil tank, has a high-low staggered layout, has high space utilization, fully utilizes the structural advantages, and is convenient for oil backflow, heat dissipation and storage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power generation equipment, in particular to a composite oil tank and a wind power integrated system comprising the same. BACKGROUND

[0002] With the progress of society and the development of mankind, the demand for energy is also increasing, and the traditional energy industry has been unable to meet the demand, and new energy has begun to emerge, wind energy has gradually become the leader of new energy with its environmental protection, economy and many other advantages, and all countries in the world pay great attention to the development and utilization of wind energy. In recent years, China has invested a lot of energy in the construction of wind power generation, and has formed a large scale. With the rapid development of wind power generation, various auxiliary technologies for wind power generation are also constantly updated and improved.

[0003] Large wind power generation system includes hydraulic system for braking and lubricating system for lubrication, the hydraulic system includes high speed shaft brake, yaw brake and wind wheel locking three parts, the lubricating system includes gear box lubrication, main bearing lubrication and generator bearing lubrication three parts, in the prior art, the parts of the hydraulic system and the lubricating system are dispersedly arranged, especially the oil storage, filtration and heat dissipation cooling layout of the lubricating system is dispersed, the lubricating oil source and the hydraulic oil source are dispersedly arranged, resulting in low space utilization. The present application aims to provide a composite oil tank which can integrate the oil storage of the hydraulic system and the oil storage of the lubricating system, and also provide a basis for filtering and heat dissipation cooling of the integrated lubricating system. SUMMARY

[0004] The present application aims to overcome the defects of dispersed layout of lubricating oil source and hydraulic oil source, dispersed layout of oil storage, filtration and heat dissipation cooling in the lubricating system in the existing fan system, and to provide a composite oil tank and a wind power integrated system comprising the same.

[0005] The present application solves the above technical problems by the following technical solutions:

[0006] A composite oil tank for a wind power integrated system, comprising an oil tank body and a separation structure, the oil tank body has a receiving cavity; the separation structure is arranged in the receiving cavity and separates the oil tank body into a hydraulic oil cavity and a lubricating oil cavity which are independent of each other; the separation structure further divides the lubricating oil cavity into a lubricating oil return area, a lubricating oil suction area, a cooling oil return area, a cooling oil suction area, a first channel and a second channel; the lubricating oil return area is communicated with the cooling oil return area through the first channel, and the lubricating oil return area, the first channel and the cooling oil return area form an oil mixing area; the lubricating oil suction area and the cooling oil suction area are respectively communicated with the oil mixing area through the second channel.

[0007] Optionally, the first side and the second side of the lubricating oil return area are respectively connected with the first channel, and the two first channels are respectively connected with a cooling oil return area.

[0008] The lubricating oil suction area is located between the two cooling oil suction areas, and is adjacent to the lubricating oil return area.

[0009] Optionally, the oil tank body comprises:

[0010] A machine body shell, which is upwardly open;

[0011] A panel structure, which is installed at the opening of the machine body shell and forms the accommodation cavity together with the machine body shell;

[0012] A wiring structure, which connects and forms a wiring groove with the machine body shell and / or the panel structure, and has a wiring hole on the panel structure, which communicates with the wiring groove.

[0013] Optionally, the machine body shell is provided with an oil return flange interface, which is used to connect an oil return pipeline for delivering lubricating oil to the lubricating oil return area.

[0014] The panel structure has a lubricating oil return mounting hole, a lubricating oil suction mounting hole, a cooling oil return mounting hole and a cooling oil suction mounting hole, the lubricating oil return mounting hole communicates with the lubricating oil return area, the lubricating oil suction mounting hole communicates with the lubricating oil suction area, the cooling oil return mounting hole communicates with the cooling oil return area, and the cooling oil suction mounting hole communicates with the cooling oil suction area.

[0015] The panel structure further has a hydraulic mounting hole, which communicates with the hydraulic oil cavity.

[0016] Optionally, the first channel is provided with a reinforcing rib, which is used to form a vortex of the lubricating oil in the first channel.

[0017] Optionally, the composite oil tank further comprises:

[0018] A magnetic filter arranged in the lubricating oil return area;

[0019] An auxiliary heater arranged in the lubricating oil suction area.

[0020] Optionally, the composite oil tank further comprises an auxiliary component mounting bracket, which is connected with the oil tank body, the auxiliary component mounting bracket comprises an auxiliary component mounting platform located above the oil tank body, the auxiliary component mounting platform is used to mount an auxiliary component of the composite oil tank, and an installation space is formed between the auxiliary component mounting platform and the oil tank body.

[0021] Optionally, the auxiliary component mounting bracket further comprises a plurality of legs, both ends of the legs being connected to the auxiliary component mounting platform and the oil tank body respectively;

[0022] The composite oil tank further comprises an oil tank fixing flange arranged around the machine body shell, and the lower ends of the legs are fixed to the oil tank fixing flange.

[0023] Optionally, the composite oil tank further comprises an inspection passage extending upward and downward, the side surface of the inspection passage being adjacent to the hydraulic oil cavity and the hydraulic oil tank.

[0024] A wind power integrated system comprising the composite oil tank according to any one of the above.

[0025] Advantages:

[0026] 1. The separation structure is arranged in the oil tank body, which is equivalent to integrating the hydraulic oil tank and the lubricating oil tank together, so that the lubricating oil source of the lubricating system and the hydraulic oil source of the hydraulic braking system of the wind power integrated system are integrated in the oil tank body, thereby saving the total space occupied by the hydraulic oil tank and the lubricating oil tank, and improving the compactness of the lubricating system, the cooling system and the hydraulic braking system.

[0027] 2. The installation space is reserved between the auxiliary component mounting platform and the oil tank body, and is used for mounting the equipment associated with the hydraulic oil cavity and the lubricating oil cavity in the wind power integrated system, thereby improving the compactness of the wind power integrated system.

[0028] 3. The components of the wind power integrated system are mounted through the auxiliary component mounting platform, the space on the upper layer of the oil tank is fully utilized, the equipment is installed in a high-low staggered layout, and this is also conducive to reducing the volume of the engine room.

[0029] 4. The lubricating oil cavity is divided into a lubricating oil return area, a lubricating oil suction area, a cooling oil return area and a cooling oil suction area, and is connected through the first passage and the second passage, thereby increasing the flow channel and flowability of the lubricating oil and improving the heat dissipation effect. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 FIG. 1 is a structural schematic diagram of a composite oil tank according to a preferred embodiment of the present application.

[0031] Figure 2 FIG. 2 is a partial structural schematic diagram of the composite oil tank according to the preferred embodiment of the present application from one perspective, in which the auxiliary component mounting bracket is hidden.

[0032] Figure 3 FIG. 3 is a partial structural schematic diagram of the composite oil tank according to the preferred embodiment of the present application from another perspective, in which the auxiliary component mounting bracket is hidden.

[0033] Figure 4The figure is a schematic view of the front structure of the composite oil tank of the preferred embodiment of the present application, wherein the auxiliary component mounting bracket is hidden.

[0034] Figure 5 The figure is a schematic view of the right structure of the composite oil tank of the preferred embodiment of the present application, wherein the auxiliary component mounting bracket is hidden.

[0035] Figure 6 The figure is a schematic view of the top structure of the composite oil tank of the preferred embodiment of the present application, wherein the auxiliary component mounting bracket is hidden.

[0036] Figure 7 The figure is a schematic view of the back structure of the composite oil tank of the preferred embodiment of the present application, wherein the auxiliary component mounting bracket is hidden.

[0037] Explanation of reference signs:

[0038] Oil tank body 1, hydraulic oil cavity 2, lubricating oil return area 3, oil return flange interface 4, first side 5, second side 6, lubricating oil suction area 7, cooling oil return area 8, cooling oil suction area 9, first channel 10, separation structure 11, auxiliary component mounting bracket 12, frame structure 13, isolation net 14, leg 15, mounting plate 16, machine body shell 17, panel structure 18, lubricating oil return mounting hole 19, lubricating oil suction mounting hole 20, cooling oil return mounting hole 21, cooling oil suction mounting hole 22, wiring structure 23, wiring groove 24, wiring hole 25, reinforcing rib 26, magnetic filter 27, auxiliary heater 28, oil tank fixing flange 29, maintenance passage 30. DETAILED DESCRIPTION

[0039] The present application will be described in more detail by way of examples and with reference to the drawings, but the present application is not limited to the described examples.

[0040] Before the present application is described in detail, the working principle of the wind power system is briefly described. The wind power system comprises a wind wheel, a gear box, a generator, a machine cabin, a lubricating system, a cooling system and a hydraulic braking system. The gear box and the generator are installed in the machine cabin. The wind wheel is connected to the input end of the gear box through a main shaft (slow speed shaft). The generator is connected to the output shaft (high speed shaft) of the gear box. The slow rotation movement generated by the wind wheel is accelerated by the gear box and then output to the generator. The lubricating system is used to lubricate one or more of the gear box, the main shaft bearing and the generator bearing. The cooling system is used to cool the lubricating oil of the lubricating system. The hydraulic braking system is used to realize high speed shaft (the shaft of the output end of the gear box) braking, yawing braking and wind wheel locking.

[0041] The embodiment of the present application provides a wind power integrated system, which comprises a composite oil tank, lubricating oil and hydraulic oil of the wind power integrated system are integrated in the composite oil tank, and correspondingly, components directly connected with the lubricating oil tank and the hydraulic oil tank can be integrated near the composite oil tank.

[0042] The following will be described in detail with reference to the accompanying drawings Figures 1-7 The composite oil tank is specifically described. The embodiment of the present application provides a composite oil tank for a wind power integrated system, which comprises an oil tank body 1, a separation structure 11 and an auxiliary component mounting bracket 12. The oil tank body 1 has a receiving cavity for receiving oil. The separation structure 11 is arranged in the receiving cavity and separates the oil tank body 1 into a hydraulic oil cavity 2 and a lubricating oil cavity which are independent of each other. The hydraulic oil cavity 2 is used for storing hydraulic oil for a hydraulic braking system of the wind power integrated system, and the lubricating oil cavity is used for storing lubricating oil for a lubricating system of the wind power integrated system. The hydraulic system, the lubricating system and the cooling system can be centrally arranged on and near the composite oil tank. The auxiliary component mounting bracket 12 is connected with the oil tank body 1. The auxiliary component mounting bracket 12 comprises an auxiliary component mounting platform arranged above the oil tank body 1. The auxiliary component mounting platform and the oil tank body 1 are spaced apart to form a mounting space. The mounting space can provide space for mounting devices related to the hydraulic oil cavity 2 (such as a motor, a pump and a valve group for pumping hydraulic oil) and devices related to the lubricating oil cavity (such as a motor, a pump and a valve group for pumping lubricating oil). The auxiliary component mounting platform is used for mounting auxiliary components of the composite oil tank. The auxiliary components herein refer to components of the wind power integrated system except the composite oil tank.

[0043] As known from the above, the embodiment of the present application arranges the separation structure 11 in the oil tank body 1, which is equivalent to integrating the hydraulic oil tank and the lubricating oil tank together, so that the lubricating oil source of the lubricating system and the hydraulic oil source of the hydraulic braking system of the wind power integrated system are integrated in the oil tank body 1. Not only the total space occupied by the hydraulic oil tank and the lubricating oil tank is saved, but also the compactness of the lubricating system, the cooling system and the hydraulic braking system is improved. The embodiment of the present application reserves the mounting space between the auxiliary component mounting platform and the oil tank body 1 for mounting devices related to the hydraulic oil cavity 2 and the lubricating oil cavity in the wind power integrated system, which improves the compactness of the wind power integrated system. The embodiment of the present application can further mount components of the wind power integrated system through the auxiliary component mounting platform, fully utilizes the space on the upper layer of the oil tank, arranges the devices in different layers, and is also beneficial to reducing the volume of the engine room.

[0044] In the embodiment of the present application, the partition structure 11 also divides the lubricating oil cavity into a lubricating oil return area 3, a lubricating oil suction area 7, a cooling oil return area 8, a cooling oil suction area 9, a first channel 10 and a second channel. The lubricating oil return area 3 is communicated with the cooling oil return area 8 through a first passage, and the lubricating oil return area 3, the first passage and the cooling oil return area 8 form an oil mixing area to cool the lubricating oil in the lubricating oil return area 3; the lubricating oil suction area 7 and the cooling oil suction area 9 are respectively communicated with the oil mixing area through a second channel, so that the mixed lubricating oil flows to the lubricating oil suction area 7 and the cooling oil suction area 9.

[0045] In application, in the lubricating system, the lubricating oil in the lubricating oil suction area 7 is pumped out to lubricate the equipment, and the temperature of the lubricating oil is increased during the lubricating process, that is, the temperature of the lubricating oil returned to the lubricating oil return area 3 is increased compared with the temperature when the lubricating oil is pumped out, the lubricating oil in the lubricating oil return area 3 flows to the cooling return area along the first channel 10, is fully mixed with the lubricating oil in the cooling return area which has a relatively low temperature, and the mixed lubricating oil enters the lubricating oil suction area 7 and the cooling oil suction area 9 through the second channel.

[0046] The lubricating oil cavity is divided into the lubricating oil return area 3, the lubricating oil suction area 7, the cooling oil return area 8 and the cooling oil suction area 9, and is connected through the first channel 10 and the second channel, so that the flow channel and flowability of the lubricating oil are increased, and the heat dissipation efficiency is improved.

[0047] In the embodiment of the present application, the first side 5 and the second side 6 of the lubricating oil return area 3 are respectively connected with the first channel 10, and the two first channels 10 are respectively connected with a cooling oil return area 8, wherein the first side 5 and the second side 6 are oppositely arranged; the lubricating oil return area 3, the first channel 10 and the cooling oil return area 8 are arranged at positions close to the periphery of the oil tank body 1, and the three together enclose a C-shaped structure, so that the air outside the oil tank body 1 can exchange heat with the lubricating oil in the first channel 10, and the first channel 10 has a greater length, further improving the heat dissipation efficiency. The lubricating oil suction area 7 is located between the two cooling oil suction areas 9, and the lubricating oil suction area 7 is adjacent to the lubricating oil return area 3.

[0048] In the embodiment of the present application, the oil tank body 1 includes a machine shell 17, a panel structure 18 and a wiring structure 23, wherein the machine shell 17 can be formed by welding a plurality of plates, the machine shell 17 encloses a cavity, and the opening of the cavity faces upward; the panel structure 18 is installed at the opening of the machine shell 17 and encloses a containing cavity together with the machine shell 17; the panel structure 18 includes one or more panels, and the shapes of different panels can be different, each panel is welded on the machine shell 17, and adjacent panels can be connected in one step. Figure 3In the embodiment, the height of the opening of the machine body shell 17 corresponding to the position of the lubricating oil cavity is higher than the height of the opening corresponding to the position of the hydraulic oil cavity 2, and the panel structure 18 comprises a first panel corresponding to the lubricating oil cavity and a second panel corresponding to the hydraulic oil cavity 2, and the abutting position of the first panel and the second panel is connected by a longitudinal plate, and the longitudinal plate is divided in the partition structure 11 in the embodiment.

[0049] The wiring structure 23 can comprise a plurality of plates welded on the machine body shell 17 and / or the panel structure 18 and forming wiring grooves 24 with the machine body shell 17 and / or the panel structure 18, and the panel structure 18 is provided with wiring holes 25 communicating with the wiring grooves 24.

[0050] As shown in some embodiments, Figure 2 The wiring structure 23 connects the machine body shell 17 and the panel structure 18 at the same time, the wiring grooves 24 extend along the radial direction of the machine body shell 17, and the panel structure 18 is built in the accommodating cavity, and correspondingly, the wiring grooves 24 are located in the accommodating cavity. The wiring grooves 24 can extend from the upper end of the accommodating cavity to the bottom surface of the accommodating cavity, and correspondingly, the lower end of the panel structure 18 is welded with the bottom surface of the machine body shell 17, or alternatively, the wiring grooves 24 can be higher than the bottom surface of the accommodating cavity, and correspondingly, the lower end of the panel structure 18 does not extend to the bottom surface of the machine body shell 17, and the panel structure 18 is provided with a bottom plate by itself to ensure that the wiring grooves 24 are isolated from the oil. Each of the two ends of the wiring groove 24 has a wiring hole 25.

[0051] In the embodiment, the machine body shell 17 is provided with an oil return flange interface 4, and the oil return flange interface 4 is used to connect the oil return pipeline for conveying lubricating oil to the lubricating oil return area 3. Figure 2 As shown in the embodiment, the machine body shell 17 is provided with three oil return flange interfaces 4, and the three oil return flange interfaces 4 can be connected with the oil return pipelines corresponding to the gearboxes, or can be connected with the oil return pipelines corresponding to the gearboxes, the oil return pipelines corresponding to the main shaft bearings and the oil return pipelines corresponding to the generator bearings one by one.

[0052] The panel structure 18 is provided with a lubricating oil return mounting hole 19, a lubricating oil suction mounting hole 20, a cooling oil return mounting hole 21 and a cooling oil suction mounting hole 22, the lubricating oil return mounting hole 19 communicates with the lubricating oil return area 3, the lubricating oil suction mounting hole 20 communicates with the lubricating oil suction area 7, the cooling oil return mounting hole 21 communicates with the cooling oil return area 8, and the cooling oil suction mounting hole 22 communicates with the cooling oil suction area 9. The panel structure 18 is provided with components in the lubricating system at the positions of the lubricating oil return mounting hole 19 and the lubricating oil suction mounting hole 20, and is provided with components in the cooling system at the positions of the cooling oil return mounting hole 21 and the cooling oil suction mounting hole 22. The panel structure 18 is also provided with a hydraulic mounting hole communicating with the hydraulic oil cavity 2, and is provided with components in the hydraulic brake system at the position of the hydraulic mounting hole.

[0053] In the embodiment of the present application, the first channel 10 is provided with a reinforcing rib 26 for forming a vortex in the lubricating oil in the first channel 10. The reinforcing rib 26 extends upward and downward, and the side surface of the reinforcing rib 26 is fixed to the side wall of the first channel 10. The reinforcing rib 26 plays a role of a spoiler, and when the lubricating oil hits the reinforcing rib 26, a vortex is generated, so that the lubricating oil flowing from the lubricating oil return area 3 to the lubricating oil in the cooling oil return area 8 is mixed more fully.

[0054] In the embodiment of the present application, the composite oil tank further comprises a magnetic filter 27 arranged in the lubricating oil return area 3 for adsorbing metal particles and purifying the lubricating oil.

[0055] The composite oil tank further comprises an auxiliary heater 28 arranged in the lubricating oil suction area 7 for controlling the temperature of the lubricating oil in the lubricating oil suction area 7 to obtain a better lubricating effect.

[0056] The composite oil tank further comprises an oil tank fixing flange 29 arranged around the engine housing 17, the inner side of the oil tank fixing flange 29 is fixedly connected with the engine housing 17, and the oil tank body 1 can be installed in the engine compartment through the oil tank fixing flange 29. The lower end of the auxiliary component mounting bracket 12 is fixed to the oil tank fixing flange 29.

[0057] In the embodiment of the present application, the auxiliary component mounting platform can comprise a frame structure 13 and a partition net 14, the frame structure 13 is formed by butt welding a plurality of beams, the frame structure 13 forms a plurality of empty space areas, and part of the empty space areas are provided with the partition net 14, the shape of the empty space area is adapted to the shape of the partition net 14, and the periphery of the partition net 14 is fixed to the inner edge of the empty space area.

[0058] In the embodiment of the present application, the auxiliary component mounting bracket 12 further comprises a plurality of legs 15, the two ends of the leg 15 are connected with the auxiliary component mounting platform and the oil tank body 1 respectively. As shown in Figure 1 The oil tank fixing flange 29 is provided with a plurality of mounting plates 16, at least part of the two sides of the leg 15 is provided with the mounting plate 16, the lower end of the mounting plate 16 is welded with the oil tank fixing flange 29, part of the side surface of the mounting plate 16 is welded with the side wall of the engine housing 17, and the leg 15 is connected with the mounting plate 16 through a fastener. The leg 15 is installed on the oil tank body 1 through the mounting plate 16, and the rigidity of the oil tank body 1 itself is also improved.

[0059] In the embodiment of the present application, the composite oil tank further comprises an upward and downward extending maintenance channel 30, as shown in Figure 3 The side surface of the maintenance channel 30 is adjacent to the hydraulic oil cavity 2 and the hydraulic oil tank, which is convenient for maintenance.

[0060] Although the specific embodiments of the present application have been described above, it is understood by those skilled in the art that the present application is only illustrated by way of example, and the scope of protection of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to the embodiments without departing from the principles and essence of the present application, and such changes and modifications fall within the scope of protection of the present application.

Claims

1. A composite fuel tank for an integrated wind power system, characterized in that, The system includes an oil tank body and a partition structure. The oil tank body has a receiving cavity. The partition structure is disposed within the receiving cavity and separates the oil tank body into an independent hydraulic oil cavity and a lubricating oil cavity. The partition structure further divides the lubricating oil cavity into a lubrication return zone, a lubrication suction zone, a cooling return zone, a cooling suction zone, a first channel, and a second channel. The lubrication return zone is connected to the cooling return zone through the first channel, and the lubrication return zone, the first channel, and the cooling return zone form an oil mixing zone. The lubrication suction zone and the cooling suction zone are respectively connected to the oil mixing zone through the second channel. The composite fuel tank also includes an auxiliary component mounting bracket, which is connected to the fuel tank body. The auxiliary component mounting bracket includes an auxiliary component mounting platform located above the fuel tank body. The auxiliary component mounting platform is used to install the auxiliary components of the composite fuel tank, and an installation space is formed between the auxiliary component mounting platform and the fuel tank body.

2. The composite fuel tank as described in claim 1, characterized in that, The first side and the second side of the lubrication return oil zone are each connected to the first channel, and the two first channels are each connected to a cooling return oil zone, wherein the first side and the second side are arranged opposite to each other; The lubrication oil suction zone is located between the two cooling oil suction zones, and the lubrication oil suction zone is adjacent to the lubrication oil return zone.

3. The composite fuel tank as described in claim 2, characterized in that, The fuel tank body includes: The outer casing of the machine body has its opening facing upwards; The panel structure is installed at the opening of the outer casing and forms the receiving cavity with the outer casing; A wiring structure connects the outer casing and / or panel structure, and forms a wiring groove with the outer casing and / or panel structure. The panel structure has wiring holes that communicate with the wiring groove.

4. The composite fuel tank as described in claim 3, characterized in that, The outer casing of the machine body is provided with an oil return flange interface, which is used to connect the oil return pipeline that delivers lubricating oil to the lubrication return area; The panel structure has a lubrication return oil mounting hole, a lubrication suction oil mounting hole, a cooling return oil mounting hole, and a cooling suction oil mounting hole. The lubrication return oil mounting hole is connected to the lubrication return oil area, the lubrication suction oil mounting hole is connected to the lubrication suction oil area, the cooling return oil mounting hole is connected to the cooling return oil area, and the cooling suction oil mounting hole is connected to the cooling suction oil area. The panel structure also has a hydraulic mounting hole, which connects to the hydraulic oil chamber.

5. The composite fuel tank as described in claim 1, characterized in that, The first channel is equipped with reinforcing ribs to create a vortex in the lubricating oil within the channel.

6. The composite fuel tank as described in claim 1, characterized in that, The composite fuel tank also includes: A magnetic filter element disposed within the lubrication return zone; An auxiliary heater is located within the lubrication and oil absorption zone.

7. The composite fuel tank as described in claim 3, characterized in that, The auxiliary component mounting bracket also includes several legs, with each end of the legs connected to the auxiliary component mounting platform and the fuel tank body, respectively. The composite oil tank also includes an oil tank fixing flange disposed around the outer shell of the machine body, and the lower end of the support leg is fixed to the oil tank fixing flange.

8. The composite fuel tank according to any one of claims 1-7, characterized in that, The composite oil tank also includes an inspection channel extending vertically, the side of which is adjacent to the hydraulic oil chamber and the lubricating oil chamber.

9. A wind power integrated system, characterized in that, Includes the composite fuel tank as described in any one of claims 1-8.

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