A plate-type cross-counterflow air cooling system for offshore high-power generators

Abstract

The present invention discloses a plate-type cross-countercurrent air cooling system for a large-power offshore generator, comprising a cabinet, a cooling core assembly, an inner air inlet assembly, an outer air inlet assembly, an inner air outlet and an outer air outlet, wherein the cooling core assembly is arranged inside the cabinet, two inner air inlets are formed at one end of the cabinet, each inner air inlet is equipped with an inner air inlet assembly, and an inner air outlet is formed at the other end, two outer air inlets are formed on one side of the cabinet, each outer air inlet is equipped with an outer air inlet assembly, and an outer air outlet is formed on the other side. The present invention has the advantages of simple structure, light weight, small size, high heat exchange efficiency, good waterproof and anti-corrosion properties, etc.

Description

Technical Field

[0001] The invention relates to the technical field of offshore wind turbines, and in particular to a plate-type cross-counterflow air cooling system for offshore high-power turbines. Background Art

[0002] It is well known in the industry that permanent magnet wind turbines have the characteristics of high efficiency, high power factor, light weight, simple structure, high reliability, and high power density. When the generator is running, a large amount of heat generated by iron loss, copper loss, stray loss, etc. will be generated. If the heat exchange cannot be effectively discharged in time during operation, the normal operation of the generator will be affected. However, the heat exchange power of the cooling system cannot be too large or less than the heat loss generated by the generator. Therefore, when designing the generator cooling system, the matching of the generator loss and the heat exchange power of the cooling system should be fully considered. In the existing wind turbine cooling system, the internal wind path itself does not have a fan, and the cooling medium circulation is achieved by the fans at both ends of the generator rotor. When designing the generator, the length of the rotor must be considered to be able to install the fan, so that the overall length of the generator is lengthened, the volume is increased, and the power density of the generator is reduced. In addition, if the fan is installed on the rotor, its cooling effect and mechanical power loss are closely related to the speed of the generator, which affects the heat exchange effect and the efficiency of the generator. The external wind path uses a single fan. Once damaged, the generator will not be able to operate, which reduces the reliability of the unit. When the unit is running at low power, the power loss of the fan operation accounts for a large proportion, affecting the efficiency of the generator. At the same time, the existing cooling system uses heat pipes for heat exchange, and the heat exchange efficiency is low. For high-power generators, the volume of the cooling system needs to be designed to be very large so that the heat exchange power can match the heat loss of the generator. However, the generator cooling system needs to be installed at an altitude of several hundred meters, so the weight and size of the entire cooling system should not be too large. In addition, the generator cooling system is installed at sea, with harsh humidity and salt spray. Once rain, moisture, etc. enter the generator, the insulation resistance of the stator winding will be low, causing the risk of the generator burning. Its sealing, waterproofing and corrosion resistance are also very important. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a plate-type cross-countercurrent air cooling system for offshore high-power generators which has a simple structure, light weight, small size, high heat exchange efficiency, good waterproof and anti-corrosion properties.

[0004] To achieve the above-mentioned purpose, the technical solution provided by the present invention is: a plate-type cross-countercurrent air cooling system for a large-power offshore generator, comprising a cabinet, a cooling core group assembly, an inner air inlet assembly, an outer air inlet assembly, an inner air outlet and an outer air outlet, wherein the cooling core group assembly is arranged inside the cabinet, and two inner air inlets are formed at one end of the cabinet, and each inner air inlet is equipped with an inner air inlet assembly, through which hot air is drawn from the middle air outlet of the generator into the interior of the cooling core group assembly, and the other end is formed with an inner air outlet, which is formed by the inner air inlet assembly, the cooling core group assembly and the inner air outlet. The air vents constitute the inner air path of the cooling system. Two outer air inlets are formed on one side of the cabinet. Each outer air inlet is equipped with an outer air inlet assembly. The outside air sucked in through the two outer air inlet assemblies is converted into cool air after heat exchange with the hot air inside the cooling core assembly. An outer air outlet is formed on the other side. The outer air inlet assembly, the cooling core assembly and the outer air outlet constitute the outer air path of the cooling system. The cool air after heat exchange between the inner air path and the outer air path is finally sent back to the generator through the inner air outlet, and the hot air after heat exchange is discharged from the outer air outlet, thereby forming an internal circulation of the generator cooling medium.

[0005] Furthermore, the cooling core group assembly includes a plurality of core group modules, and the plurality of core group modules are arranged in a matrix.

[0006] Furthermore, the core module is composed of a heat exchange tooth plate and an external support frame for fixing the heat exchange tooth plate.

[0007] Furthermore, the heat exchange tooth plate is an aluminum sheet with an epoxy resin coating, and the thickness of the aluminum sheet is 0.2 mm.

[0008] Furthermore, the inner air path air inlet assembly includes an inner air path centrifugal fan, an inner air path variable frequency drive motor for driving the inner air path centrifugal fan to rotate, and an inner air path air guide cover installed on the inner air path centrifugal fan.

[0009] Furthermore, the external air path air inlet assembly includes an external air path axial flow fan, an external air path variable frequency drive motor for driving the external air path axial flow fan to rotate, and an external air path air guide cover installed on the external air path axial flow fan.

[0010] Furthermore, an air guide cover is provided at the air outlet of the inner air passage.

[0011] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0012] 1. The present invention has a simple structure, small size and light weight. By adopting a dual fan structure, the flow rate and wind pressure of the cooling medium passing through the cooling core group are uniform, so the heat exchange area of ​​the heat exchange tooth plate can be fully utilized, greatly improving the heat exchange efficiency of the cooling system. At the same time, the fan drive motor adopts a variable frequency drive motor and a two-way redundant design, which improves the reliability and utilization efficiency of the cooling system.

[0013] 2. The inner wind path of the present invention has a dual fan structure, which eliminates the need to consider installing fans at both ends of the rotor when designing the generator, facilitates motor design, reduces the axial length of the generator, fully utilizes the space of the generator base, and greatly improves the power density of the generator. In addition, both the outer wind path variable frequency drive motor and the inner wind path variable frequency drive motor can adopt an open bearing structure. Compared with the existing cooling system fan motor using sealed bearings, grease can be added and waste oil can be discharged, which is convenient for maintenance and prolongs the service life of the motor.

[0014] 3. The present invention enables the cooling medium inside the generator to exchange heat with the external air only in the cooling core assembly and be isolated from each other, so there is no cross-contamination between the internal and external air, and can effectively prevent external moisture and salt spray from entering the generator, causing corrosion of components, thereby ensuring the protection level of the generator. At the same time, according to the operating ambient temperature and output power of the generator, the heat exchange power of the entire cooling system can be adjusted by controlling the number of running centrifugal fans in the internal wind path or the operating frequency of the variable frequency drive motor in the internal wind path, so that the thermal balance between the generator and the cooling system is a dynamic balance, which satisfies the thermal stability of the generator under different operating conditions and optimizes the efficiency of the generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 for Figure 1 Schematic diagram of the structure with some components removed.

[0017] Figure 3 It is a structural schematic diagram of the core group module of the present invention.

[0018] Figure 4 It is a structural schematic diagram of the inner air path air inlet assembly of the present invention.

[0019] Figure 5 It is a structural schematic diagram of the external air path air inlet assembly of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with specific embodiments.

[0021] like Figures 1 to 5As shown, the offshore high-power generator plate cross-countercurrent air cooling system described in this embodiment is installed above the generator, including a cabinet 1, a cooling core group assembly 2, an inner air inlet assembly 3, an outer air inlet assembly 4, an inner air outlet 5 and an outer air outlet (not shown in the figure), the cooling core group assembly 2 includes a plurality of core group modules, and the plurality of core group modules are arranged in a matrix inside the cabinet 1, each core group module is composed of a heat exchange tooth plate 201 and an external support frame 202 for fixing the heat exchange tooth plate 201, the heat exchange tooth plate 201 is an aluminum sheet with an epoxy resin coating, The thickness of the aluminum sheet is 0.2 mm, and it has the advantages of light weight, good heat exchange effect, and strong corrosion resistance; two inner air inlets are formed at one end of the cabinet 1, and each inner air inlet is equipped with an inner air inlet assembly 3, and the inner air inlet assembly 3 includes an inner air centrifugal fan 301, an inner air variable frequency drive motor 302 for driving the inner air centrifugal fan 301 to rotate, and an inner air guide cover 303 installed on the inner air centrifugal fan 301. The hot air is drawn from the middle air outlet of the generator into the interior of the cooling core assembly 2 through the two inner air inlet assemblies 3, and the other end thereof An inner air outlet 5 is formed, and an air guide cover (not shown in the figure) is installed. The inner air inlet assembly 3, the cooling core assembly 2 and the inner air outlet 5 constitute the inner air path of the cooling system; two outer air inlets are formed on one side of the cabinet 1, and each outer air inlet is equipped with an outer air inlet assembly 4, and the outer air inlet assembly 4 includes an outer air axial fan 401, an outer air variable frequency drive motor 402 for driving the outer air axial fan 401 to rotate, and an outer air guide cover 403 installed on the outer air axial fan 401, through the two outer air inlet assemblies 4 The inhaled external air is converted into cool air after heat exchange with the hot air inside the cooling core group component 2, and an external air outlet is formed on the other side (not shown in the figure). The external air inlet component 4, the cooling core group component 2 and the external air outlet constitute the external air path of the cooling system. The cool air after heat exchange between the internal and external air paths is finally sent back to the generator through the internal air outlet 5, and the hot air after heat exchange is discharged from the external air outlet, thereby forming an internal circulation of the generator cooling medium, cooling the stator and rotor of the generator, so that the operation of the generator is always in a thermal equilibrium state and the temperature rise of the motor is kept stable.

[0022] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A plate-type cross-counterflow air cooling system for offshore high-power generators, characterized in that: The invention comprises a cabinet, a cooling core group assembly, an inner air path air inlet assembly, an outer air path air inlet assembly, an inner air path air outlet and an outer air path air outlet, wherein the cooling core group assembly is arranged inside the cabinet, the cooling core group assembly comprises a plurality of core group modules, and the plurality of core group modules are arranged in a matrix shape, two inner air path air inlets are formed at one end of the cabinet, each inner air path air inlet is equipped with an inner air path air inlet assembly, hot air is drawn into the interior of the cooling core group assembly from the middle air outlet of the generator through the two inner air path air inlet assemblies, an inner air path air outlet is formed at the other end of the cabinet, the inner air path air inlet assembly comprises an inner air path centrifugal fan, an inner air path variable frequency drive motor for driving the inner air path centrifugal fan to rotate and an inner air path air guide cover installed on the inner air path centrifugal fan, and the cooling core group assembly, the cooling core group assembly and the inner air path air outlet constitute a cooling The system has an internal air path, two external air inlets are formed on one side of the cabinet, each of the external air inlets is equipped with an external air inlet assembly, the external air sucked in through the two external air inlet assemblies is converted into cool air after heat exchange with the hot air inside the cooling core assembly, and an external air outlet is formed on the other side of the cabinet, the external air inlet assembly comprises an external air axial fan, an external air variable frequency drive motor for driving the external air axial fan to rotate and an external air guide cover installed on the external air axial fan, the external air inlet assembly, the cooling core assembly and the external air outlet constitute the external air path of the cooling system, the cool air after heat exchange between the internal air path and the external air path is finally sent back to the generator through the internal air outlet, and the hot air after heat exchange is discharged from the external air outlet, thereby forming an internal circulation of the generator cooling medium.

2. A plate-type cross-counterflow air cooling system for a large offshore power generator according to claim 1, characterized in that: The core module is composed of a heat exchange tooth plate and an external support frame for fixing the heat exchange tooth plate.

3. A plate-type cross-counterflow air cooling system for offshore high-power generators according to claim 2, characterized in that: The heat exchange tooth plate is an aluminum sheet with epoxy resin coating, and the thickness of the aluminum sheet is 0.2 mm.

4. The plate-type cross-counterflow air cooling system for offshore high-power generators according to claim 1 is characterized in that: An air guide cover is provided at the air outlet of the inner air path.

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