Novel double-fed wind power cooling centrifugal fan

Abstract

The invention discloses a novel double-fed wind power cooling centrifugal fan, which relates to the technical field of centrifugal ventilation equipment and comprises a volute, a motor mounting plate, a motor, an impeller, an air inlet duct, a temperature sensor, an intelligent speed regulation module, a self-adaptive damping structure and a protective coating system. The motor is mounted on the motor mounting plate, and the motor mounting plate is fixedly connected with the volute through a fastener; an impeller is mounted on a rotating shaft of the motor, the front end of the volute is connected with an air inlet duct through a fastener, and the air inlet duct corresponds to the impeller; a temperature sensor is mounted at an air outlet of the volute; the intelligent speed regulation module automatically regulates the rotating speed of the motor according to temperature sensor data and generator operation states; the self-adaptive damping structure is mounted between the motor and the volute and is used for reducing vibration during operation of the fan; the protective coating system covers the surfaces of the volute and the impeller; the fan can provide enough cooling air quantity for the wind driven generator in long-distance conveying, and the operation reliability of the fan in a severe environment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal ventilation equipment, and particularly to a new type of double-fed wind power cooling centrifugal fan. Background Art

[0002] In the field of wind power generation, with the continuous expansion of the scale of offshore wind power and onshore wind farms, the requirements for the performance and stability of wind turbines are increasing day by day. As a key device in the cooling system of wind turbines, the performance of centrifugal fans directly affects the operating efficiency and service life of wind turbines. Wind turbines are usually installed at sea or in remote areas on land, facing harsh natural environments such as strong winds, low temperatures, high humidity, and seawater corrosion. In such an environment, centrifugal fans need to have a high degree of reliability and stability to ensure the normal operation of wind turbines. Although traditional centrifugal fans are widely used in general industrial fields, their performance limitations are gradually emerging in special scenarios such as wind power generation. There is an urgent need for a new type of centrifugal fan that can adapt to complex environments, is energy-efficient, and is stable and reliable.

[0003] In the extreme environments at sea or on land, due to the strong corrosiveness of seawater, low temperatures, large temperature differences and other factors, key components such as volutes and impellers of existing centrifugal fans are easily eroded and damaged, resulting in frequent equipment failures and a significant reduction in service life. For example, in offshore wind farms, the average service life of the volutes and impellers of traditional ventilators is only 2-3 years under the long-term erosion of seawater mist, far from meeting the requirements for the long-term stable operation of wind turbines. The cooling requirements of wind turbines have relatively high requirements for the pressure and flow rate of the fan. Traditional centrifugal fans have insufficient pressure and are difficult to provide sufficient cooling air volume for the generator in long-distance transportation, resulting in poor cooling effects and affecting the performance of the generator. Summary of the Invention

[0004] To solve the above problems, the present invention proposes a new type of double-fed wind power cooling centrifugal fan, which includes a volute, a motor mounting plate, a motor, an impeller, an air inlet duct, a temperature sensor, an intelligent speed regulation module, an adaptive shock absorption structure, and a protective coating system; the motor is installed on the motor mounting plate, and the motor mounting plate is fixedly connected to the volute through fasteners; the impeller is installed on the motor shaft, the front end of the volute is connected to the air inlet duct through fasteners, and the air inlet duct corresponds to the impeller; a temperature sensor is installed at the air outlet of the volute; The intelligent speed regulation module automatically adjusts the motor speed according to the temperature sensor data and the operating state of the generator; The adaptive shock absorption structure is installed between the motor and the volute to reduce the vibration during the operation of the fan; The protective coating system covers the surfaces of the volute and the impeller, and the protective coating system includes a primer, an intermediate coat, and a top coat to improve its corrosion resistance.

[0005] Furthermore, the motor is a YE3 or YE4 high-efficiency motor, which is installed horizontally in the B35 manner. The motor is connected with motor leads, and a protective sleeve is arranged outside the leads.

[0006] Furthermore, the impeller is designed according to the high-pressure blower impeller, and the blades are arc-shaped blades.

[0007] Furthermore, the air inlet duct is designed into a tapered arc shape. After installation, it axially extends into the impeller by 3 - 5 mm, and the radial clearance with the impeller is 2 - 3 mm.

[0008] Furthermore, the motor mounting plate is cut and blanked by a laser cutting machine, formed and processed by sheet metal bending. There are mounting stops and bolt holes on the upper surface of the motor mounting plate for installing and fixing the motor.

[0009] Furthermore, the impeller is fixedly connected to the motor shaft through fasteners and a pressing plate, and a flat key is provided.

[0010] Furthermore, the air outlet is connected in the way of square on top and round on bottom.

[0011] Furthermore, the intelligent speed regulation module includes a controller, a speed sensor and a driver. The controller receives the data from the temperature sensor and the speed sensor, calculates the required speed of the blower according to the built-in algorithm, and sends a control signal to the driver. The driver adjusts the input voltage and frequency of the motor.

[0012] Furthermore, the adaptive shock absorption structure includes an elastic support and a damping adjustment device. The elastic support is installed between the motor and the motor mounting plate, and the damping adjustment device is installed inside the elastic support. The damping adjustment device automatically adjusts the damping size according to the vibration amplitude during the operation of the blower.

[0013] Furthermore, the primer is a zinc-based coating, the intermediate coat paint is a polyurethane coating, and the topcoat is a fluorocarbon coating.

[0014] The beneficial effects of the present invention are as follows: 1. Through the cooperation of various components, the impeller adopts arc-shaped blades, which improves the pressure and efficiency of the impeller, enables the blower to provide sufficient cooling air volume for the wind turbine generator during long-distance transportation, ensures that all parts of the generator are fully cooled, and improves the power generation efficiency.

[0015] 2. The three-layer structure design of the protective coating system effectively resists seawater corrosion, ultraviolet radiation and sand erosion, extends the service life of the volute and the impeller, and greatly improves the operation reliability of the blower in harsh environments.

[0016] 3. The intelligent speed regulation module automatically adjusts the motor speed according to the actual cooling requirements of the generator, avoiding the operation of the fan at unnecessary high speeds and reducing energy consumption. The adaptive shock absorption structure effectively absorbs and suppresses the vibration generated during the operation of the motor, reducing component wear and looseness and improving the operating stability of the fan. Under harsh conditions such as strong winds, the fan can still operate stably, reducing the failure rate and ensuring the normal operation of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic front sectional view of the present invention; Figure 2 is a schematic left view of the present invention.

[0018] The descriptions of the reference numerals are as follows: 1. Volute; 2. Impeller; 3. Pressure plate; 4. Air inlet duct; 5. Temperature sensor; 6. Motor; 7. Motor mounting plate; 8. Stop washer; 9. Air outlet; 10. Motor lead wire. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] The present invention will be further described below with reference to the accompanying drawings of the specification: A new type of double-fed wind power cooling centrifugal fan, as Figure 1 and Figure 2As shown in the figure, the volute 1 is processed and formed by laser cutting and sheet metal bending processes. Inside the volute 1, the motor mounting plate 7 is fixedly connected to the volute 1 by high-strength bolts. The motor mounting plate 7 adopts welding and processing methods to ensure its rigidity and perpendicularity. On the upper surface of the motor mounting plate 7, mounting stops and bolt holes are machined for mounting and fixing the motor 6. During installation, ensure the connection accuracy between the motor mounting plate 7 and the volute 1 to avoid installation deviations that may cause unstable operation of the fan.

[0022] As Figure 1 shown, the motor 6 is selected as YE3 or YE4 high-efficiency motor 6 and is installed on the motor mounting plate 7 in the B35 horizontal installation method. The motor 6 is connected with motor leads 10, and a protective sleeve is arranged outside the leads, effectively ensuring the long-term operation of the fan in a harsh environment of minus 30 degrees. The motor 6 shaft is connected to the impeller 2 by a flat key to ensure the effective transmission of torque. The impeller 2 is designed according to the impeller 2 of a high-pressure fan, and the blades are arc-shaped blades to improve the pressure and efficiency of the impeller 2. The impeller 2 is fixedly connected to the motor 6 shaft through fasteners and a pressing plate 3, and at the same time, a stop washer 8 is installed to prevent the impeller 2 from loosening during operation. During installation, accurately adjust the concentricity between the impeller 2 and the motor 6 shaft to ensure the stability of the impeller 2 operation.

[0023] As Figure 1 shown, the air inlet duct 4 is designed in a conical arc shape, and the flanging is realized by a special process equipment for corresponding installation with the impeller 2. After the air inlet duct 4 is installed, it is required to axially extend into the impeller 2 by 3 - 5 mm, and the radial clearance with the impeller 2 is 2 - 3 mm. By accurately controlling the installation dimensions, ensure the fitting accuracy between the air inlet duct 4 and the impeller 2 to avoid interference and at the same time ensure the technical requirements of static pressure efficiency. The air inlet duct 4 is fixedly connected to the front end of the volute 1 through fasteners. During installation, ensure firm connection and good sealing to prevent air leakage.

[0024] Install the controller in the control box of the fan, connect it to the temperature sensor 5 and the speed sensor through data lines to obtain temperature and speed data in real time. The driver is installed near the motor 6 and is connected to the motor 6 through a power line to receive the control signal from the controller and adjust the speed of the motor 6. During installation, ensure the correct and reliable electrical connection between each component to avoid problems such as short circuits and open circuits. At the same time, debug the intelligent speed regulation module to ensure that it can accurately adjust the speed of the motor 6 according to actual needs.

[0025] Install an elastic support between the motor mounting plate 7 and the motor 6. The elastic support is fixed to the motor mounting plate 7 and the base of the motor 6 by bolts. Install a damping adjustment device inside the elastic support, and use a sensor to monitor the vibration amplitude during the operation of the fan in real time, and automatically adjust the damping size according to the vibration amplitude. During installation, select appropriate elastic supports and damping adjustment devices according to the model and operating parameters of the fan, and carry out installation and debugging to ensure that the adaptive shock absorption structure can effectively play its role.

[0026] Apply a protective coating on the surfaces of the volute 1 and the impeller 2. First, pre-treat the surfaces of the volute 1 and the impeller 2 to remove impurities such as oil stains and rust on the surfaces to ensure the adhesion of the coating. Then, spray the primer, intermediate paint, and topcoat in sequence. The spraying thickness of the primer is 50 - 80 μm, the spraying thickness of the intermediate paint is 80 - 120 μm, and the spraying thickness of the topcoat is 50 - 80 μm. After each layer of coating is sprayed, conduct sufficient drying and curing to ensure the coating quality. After the construction is completed, conduct quality inspection on the protective coating to ensure that its corrosion resistance and appearance quality meet the requirements.

[0027] As Figure 1 shown, install a temperature sensor 5 at the air outlet 9 of the volute 1. The temperature sensor 5 is fixedly connected to the air outlet 9 through a fastener. The probe of the temperature sensor 5 extends into the interior of the air outlet 9 and can accurately measure the temperature change of the air volume at the air outlet 9. Connect the temperature sensor 5 to the controller through a data cable to transmit the temperature data to the controller in real time for the control of the intelligent speed regulation module and remote monitoring by a computer. During installation, ensure that the temperature sensor 5 is firmly installed, the probe position is accurate, and the data transmission is stable.

[0028] The working principle of the present invention is as follows: Air cooling principle: After the motor 6 is powered on, it drives the rotating shaft to rotate at a high speed, and then drives the impeller 2 to rotate. The rotation of the impeller 2 causes a negative pressure to be formed inside the volute 1. Under the action of the pressure difference, the outside air enters the volute 1 through the air inlet duct 4. The air inlet duct 4 is designed in a conical arc shape, which can guide the air to enter the impeller 2 evenly and improve the air intake efficiency. The air obtains kinetic energy under the action of the impeller 2, and then flows along the spiral channel of the volute 1, and is converted into pressure energy at the outlet of the volute 1 to form an air flow with a certain pressure and flow rate, which is transported to the cooling part of the wind turbine generator 6 through the air outlet 9 to take away the heat generated by the generator 6 and achieve the cooling purpose.

[0029] Intelligent speed regulation principle: The temperature sensor 5 monitors the temperature change of the air volume at the air outlet 9 in real time and transmits the temperature data to the controller of the intelligent speed regulation module. At the same time, the controller also receives the operating state information of the generator 6, such as the load size, rotation speed, etc. The controller comprehensively analyzes the temperature data and the operating state of the generator 6 according to the built-in algorithm, and calculates the appropriate rotation speed required by the fan. Then, the controller sends a control signal to the driver, and the driver adjusts the input voltage and frequency of the motor 6 according to the control signal. For example, when the temperature sensor 5 detects that the temperature at the air outlet 9 rises and the load of the generator 6 increases, the controller determines that it is necessary to increase the ventilation volume to enhance the cooling effect, so it sends an instruction to the driver to increase the input voltage and frequency of the motor 6, so that the rotation speed of the motor 6 increases and the impeller 2 rotates faster, thereby increasing the ventilation volume; on the contrary, when the temperature decreases and the load of the generator 6 decreases, the controller reduces the rotation speed of the motor 6 to reduce energy consumption.

[0030] Adaptive shock absorption principle: During the operation of the fan, the vibration generated by the motor 6 is transmitted to the elastic support through the base of the motor 6. The elastic support is made of high-strength rubber material, has good elasticity, and can absorb part of the vibration energy. At the same time, the sensor inside the damping adjustment device monitors the vibration amplitude in real time. When the vibration amplitude exceeds the set threshold, the damping adjustment device automatically adjusts the internal structure, increases the damping force, and suppresses the transmission of vibration; when the vibration amplitude is within the normal range, the damping adjustment device reduces the damping force to ensure the normal operation of the motor 6. For example, when the wind turbine 6 vibrates violently due to strong winds, the elastic support absorbs most of the vibration energy, and the damping adjustment device quickly increases the damping force to further reduce the impact of vibration on the fan components and ensure the stable operation of the fan.

[0031] Protection principle of protective coating: The primer of the protective coating system adopts zinc-based paint to form a dense metal protective film on the surface of the volute 1 and the impeller 2, which can effectively isolate the contact between corrosive substances such as seawater and the metal surface and prevent the occurrence of electrochemical corrosion. The polyurethane material of the mid-coat has good flexibility and wear resistance, which can enhance the adhesion of the coating, prevent the primer from falling off, and resist the impact of particles such as wind and sand. The fluorocarbon coating of the topcoat has excellent weather resistance and can resist ultraviolet radiation, prevent the coating from aging and fading, and extend the service life of the coating. In harsh environments at sea or on land, the protective coating system can provide long-term and effective protection for the volute 1 and the impeller 2, and improve the corrosion resistance of the fan.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A novel doubly-fed wind power cooling centrifugal fan, comprising a volute (1), a motor mounting plate (7), a motor (6), an impeller (2), an air inlet duct (4), a temperature sensor (5), an intelligent speed regulation module, an adaptive damping structure and a protective coating system; the motor (6) is mounted on the motor mounting plate (7), and the motor mounting plate (7) is fixedly connected to the volute (1) via a fastener; the impeller (2) is mounted on the rotating shaft of the motor (6), the front end of the volute (1) is connected to the air inlet duct (4) via a fastener, and the air inlet duct (4) and the impeller (2) correspond to each other; the temperature sensor (5) is mounted at the air outlet (9) of the volute (1); The intelligent speed regulating module automatically adjusts the speed of the motor (6) according to the temperature sensor (5) data and the operating state of the generator (6); The adaptive vibration reduction structure is installed between the motor (6) and the volute (1) to reduce vibration when the fan is running; The protective coating system covers the surface of the volute (1) and the impeller (2), and the protective coating system comprises a primer, a mid-coat and a topcoat, thereby improving the corrosion resistance thereof.

2. According to claim 1, a novel double-fed wind power cooling centrifugal fan is characterized in that: The motor (6) is a YE3 or YE4 high-efficiency motor (6) and adopts a B35 horizontal installation method. The motor (6) is connected to a motor lead (10), and a protective sleeve is arranged on the outside of the lead.

3. According to claim 1, a novel double-fed wind power cooling centrifugal fan is characterized in that: The impeller (2) is designed as a high-pressure fan impeller (2), and the blades are arc-shaped blades.

4. According to claim 1, a novel double-fed wind power cooling centrifugal fan is characterized in that: The air inlet duct (4) is designed to be in a conical arc shape, and after installation, it extends axially into the impeller (2) by 3-5 mm, and has a radial clearance of 2-3 mm with the impeller (2).

5. According to claim 1, a novel double-fed wind power cooling centrifugal fan is characterized in that: The motor mounting plate (7) is cut by a laser cutting machine, and is formed and processed by sheet metal bending. The upper surface of the motor mounting plate (7) is provided with mounting stoppers and bolt holes for mounting and fixing the motor (6).

6. The novel double-fed wind power cooling centrifugal fan according to claim 1 is characterized in that: The impeller (2) is fixedly connected to the rotating shaft of the motor (6) via a fastener and a pressure plate (3), and is provided with a flat key.

7. The novel double-fed wind power cooling centrifugal fan according to claim 1 is characterized in that: The air outlet (9) is connected in a square-to-sky and round-to-earth manner.

8. The novel double-fed wind power cooling centrifugal fan according to claim 1 is characterized in that: The intelligent speed regulation module comprises a controller, a speed sensor and a driver. The controller receives data from the temperature sensor (5) and the speed sensor, calculates the required speed of the fan according to a built-in algorithm, and sends a control signal to the driver, which adjusts the input voltage and frequency of the motor (6).

9. The novel double-fed wind power cooling centrifugal fan according to claim 1 is characterized in that: The adaptive damping structure comprises an elastic support and a damping adjustment device, wherein the elastic support is installed between the motor (6) and the motor mounting plate (7), and the damping adjustment device is installed inside the elastic support, and the damping adjustment device automatically adjusts the damping magnitude according to the vibration amplitude when the fan is running.

10. The novel double-fed wind power cooling centrifugal fan according to claim 1 is characterized in that: The primer is a zinc-based paint, the intermediate paint is a polyurethane paint, and the topcoat is a fluorocarbon paint.

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