A low-noise fan structure for air-cooled fuel cell stacks

Abstract

The utility model discloses a low -noisy air -cooled fuel cell stack fan structure relates to battery stack heat dissipation technical field, including fan main part, the center of fan main part is provided with the installation cavity, the inside of installation cavity is provided with the mounting bracket, the one side of mounting bracket is provided with brushless motor, the inside of installation cavity is provided with fan blade, the back of fan main part is provided with control line, the outside of fan main part front end is provided with mounting panel, the four corners of mounting panel all are provided with an installation hole, the back of mounting panel is provided with rubber pad, and rubber pad is attached with mounting panel, the front of mounting panel is provided with mounting bolt, and mounting bolt is correspondingly provided with installation hole, mounting bolt and mounting panel and rubber pad through -connection, the mounting structure of this fan structure has the buffering effect, and the vibration of fan operation process can be effectively eliminated, reduces the noise of fan structure operation and produces, improves fan structure use effect.

Description

Technical Field

[0001] This utility model relates to the field of battery stack heat dissipation technology, specifically a low-noise air-cooled fan structure for fuel cell stacks. Background Technology

[0002] An air-cooled fuel cell stack is a fuel cell system that dissipates heat through natural air convection or forced ventilation. It features simple structure, low cost, and high portability, making it suitable for low-power applications. A fan is a device that uses an electric motor to drive the fan blades to rotate, thereby accelerating airflow. It is mainly used for heat dissipation and air circulation.

[0003] Chinese utility model patent CN222977075U discloses a low-noise fan structure, including a mounting housing. Several fan blade assemblies are fixedly mounted on the outer surface of the mounting housing. The outer surface of the mounting housing has four receiving grooves. Sliding grooves are formed on both sides of the inner wall of the receiving grooves. Connecting components are provided inside the receiving grooves. By designing the notch at the end of the fan blade body, it can reduce wake vortex and adopts aerodynamic principles to reduce air resistance and turbulence, thereby reducing noise. However, it does not disclose the installation structure. Most existing fans are directly fixed to the air-cooled fuel cell stack with bolts. The installed fan structure has poor buffering effect, and the vibration generated during the fan operation cannot be effectively eliminated, resulting in greater noise, reducing the performance of the fan structure and failing to meet the usage requirements. Utility Model Content

[0004] The purpose of this invention is to provide a low-noise fan structure for air-cooled fuel cell stacks, in order to solve the problems mentioned in the background art, where existing fan structures are mostly directly fixed to air-cooled fuel cell stacks with bolts, resulting in poor buffering effect, ineffective elimination of vibrations generated during fan operation, significant noise, reduced fan structure performance, and failure to meet usage requirements.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a low-noise air-cooled fuel cell stack fan structure, including a fan body, a mounting cavity is provided at the center of the fan body, a mounting frame is provided inside the mounting cavity, and the mounting frame is fixedly connected to the fan body;

[0006] A brushless motor is provided on one side of the mounting bracket, and the brushless motor is connected to the mounting bracket by screws. Fan blades are provided inside the mounting cavity, and the fan blades are connected to the output end of the brushless motor. A control line is provided on the back of the fan body, and the control line is electrically connected to the brushless motor.

[0007] A mounting plate is provided on the front exterior of the fan body, and the mounting plate is integrated with the fan body. A mounting hole is provided at each of the four corners of the mounting plate. A rubber pad is provided on the back of the mounting plate, and the rubber pad is in contact with the mounting plate. A mounting bolt is provided on the front of the mounting plate, and the mounting bolt is provided in correspondence with the mounting hole. The mounting bolt is connected to the mounting plate and the rubber pad.

[0008] Preferably, the interior of the mounting cavity is provided with a sound-absorbing pad, and the sound-absorbing pad is in close contact with the fan body.

[0009] Preferably, the front end surface of the sound-absorbing pad is provided with grooves, and the grooves are wavy.

[0010] Preferably, the fan body is provided with a first through hole, and the first through hole is connected to the mounting cavity.

[0011] Preferably, the fan blade is provided with a second through hole, which is arranged in a ring at equal intervals.

[0012] Preferably, a temperature sensor is provided on the back of the mounting bracket, and the temperature sensor is fixedly connected to the mounting bracket. The temperature sensor is linked to the brushless motor.

[0013] Preferably, the front of the mounting plate is provided with a dustproof mesh cover, which is connected to the fan body by screws, and the dustproof mesh cover is arranged parallel to the fan blades.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model device uses a brushless motor and a rubber pad. The brushless motor adopts electronic commutation technology and directly drives the rotor through sensors and controllers, completely eliminating the source of brush friction noise. The rubber pad itself has a certain elasticity, and the vibration generated during the operation of the fan structure can be buffered, absorbed and released by the rubber pad, reducing the noise of the fan structure.

[0016] 2. This utility model device uses a sound-absorbing pad and grooves to increase the contact area of ​​the sound-absorbing pad's end face. Sound waves enter the sound-absorbing pad through the grooves. The sound-absorbing pad is made of a soft and porous material. The sound waves vibrate with the air and fine fibers inside the sound-absorbing pad, and the energy of the sound waves is gradually consumed and converted into heat energy, effectively absorbing the sound wave energy and improving the noise reduction effect.

[0017] 3. The utility model device, through the setting of the second through hole, allows part of the airflow to flow from the working surface to the non-working surface when the fan blade rotates, changing the fluid velocity distribution in the boundary layer of the non-working surface, enabling the fluid in the boundary layer to gain new kinetic energy to overcome frictional resistance, preventing backflow, suppressing the occurrence of vortex detachment, reducing the aerodynamic load fluctuation on the surface of the fan blade, and thus reducing aerodynamic noise.

[0018] 4. This utility model device uses a temperature sensor to measure the temperature on one side of the fan structure. When the fuel cell stack temperature is low, the operating speed of the brushless motor can be reduced, thereby reducing the friction noise between the fan blades and the air. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is the front view of the present invention;

[0021] Figure 3 This is a diagram showing the connection relationship between the fan blades and the fan body of this utility model;

[0022] Figure 4 This is a longitudinal cross-sectional view of the fan body of this utility model.

[0023] In the diagram: 1. Fan body; 2. Mounting cavity; 3. Mounting bracket; 4. Brushless motor; 5. Control line; 6. Temperature sensor; 7. Mounting plate; 8. Rubber pad; 9. Mounting hole; 10. Mounting bolt; 11. Fan blade; 12. First through hole; 13. Dustproof mesh cover; 14. Sound-absorbing pad; 15. Second through hole; 16. Groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Please see Figure 1-4This utility model provides an embodiment of a low-noise air-cooled fuel cell stack fan structure, including a fan body 1, a mounting cavity 2 at the center of the fan body 1, a mounting frame 3 inside the mounting cavity 2, and the mounting frame 3 being fixedly connected to the fan body 1, a brushless motor 4 on one side of the mounting frame 3, and the brushless motor 4 being connected to the mounting frame 3 by screws, a fan blade 11 inside the mounting cavity 2, and the fan blade 11 being connected to the output end of the brushless motor 4, a control line 5 on the back of the fan body 1, and the control line 5 being electrically connected to the brushless motor 4, a mounting plate 7 on the front end of the fan body 1, and the mounting plate 7 being integral with the fan body 1, a mounting hole 9 at each of the four corners of the mounting plate 7, a rubber pad 8 on the back of the mounting plate 7, and the rubber pad 8 fitting against the mounting plate 7, and a mounting bolt 10 on the front of the mounting plate 7, and the mounting bolt 10 being correspondingly set with the mounting hole 9, and the mounting bolt 10 being connected through to the mounting plate 7 and the rubber pad 8.

[0026] In use: Insert the fan body 1 into the heat dissipation cavity reserved in the fuel cell stack, use the mounting bolt 10 to pass through the mounting plate 7 and connect it to the fuel cell stack to install and fix the fan structure. The rubber pad 8 itself has a certain elasticity, and the vibration generated during the operation of the fan structure can be buffered, absorbed and released by the rubber pad 8. The brushless motor 4 adopts electronic commutation technology and directly drives the rotor through the sensor and controller, completely eliminating the source of brush friction noise and reducing the noise of the fan structure.

[0027] Please see Figure 3 and Figure 4 The installation cavity 2 is equipped with a sound-absorbing pad 14, which is closely connected to the fan body 1. The front end surface of the sound-absorbing pad 14 is provided with a groove 16, which is wavy. The sound waves generated by the operation of the fan structure enter the sound-absorbing pad 14 through the groove 16. The sound-absorbing pad 14 is made of a soft and porous material. The sound waves vibrate with the air and fine fibers of the material inside the sound-absorbing pad 14. The energy of the sound waves is gradually consumed and converted into heat energy, effectively absorbing the sound wave energy and improving the noise reduction effect.

[0028] Please see Figure 1 , Figure 3 and Figure 4The fan body 1 is provided with a first through hole 12, which is connected to the mounting cavity 2. The fan blade 11 is provided with a second through hole 15, which is equidistant from the fan blade 11. The first through hole 12 connects the inside of the fan structure with the outside world, facilitating heat dissipation of the fan structure. When the fan blade 11 rotates, the second through hole 15 causes part of the airflow to flow from the working surface to the non-working surface, changing the fluid velocity distribution in the boundary layer of the non-working surface. This allows the fluid in the boundary layer to gain new kinetic energy to overcome frictional resistance, prevent backflow, suppress eddy current detachment, reduce aerodynamic load fluctuations on the surface of the fan blade 11, and thus reduce aerodynamic noise.

[0029] Please see Figure 1 and Figure 2 A temperature sensor 6 is installed on the back of the mounting bracket 3 and is fixedly connected to the mounting bracket 3. The temperature sensor 6 is linked to the brushless motor 4. A dustproof mesh cover 13 is installed in front of the mounting plate 7 and is connected to the fan body 1 by screws. The dustproof mesh cover 13 is located on one side of the fan blade 11. The temperature sensor 6 measures the temperature on one side of the fan structure. When the temperature of the fuel cell stack is low, the operating speed of the brushless motor 4 can be reduced, the friction noise between the fan blade 11 and the air can be reduced, and the noise reduction effect can be further improved.

[0030] Working principle: The fan body 1 is inserted into the pre-reserved heat dissipation cavity of the fuel cell stack. The mounting bolt 10 is used to connect to the fuel cell stack through the mounting plate 7, thus fixing the fan structure in place. The rubber pad 8 itself has a certain elasticity, and the vibrations generated during the operation of the fan structure can be buffered, absorbed, and released by the rubber pad 8. The sound waves generated by the fan structure enter the sound-absorbing pad 14 through the grooves 16. The sound-absorbing pad 14 is made of a soft, porous material. The sound waves vibrate with the air and fine fibers inside the sound-absorbing pad 14, and the energy of the sound waves is gradually consumed and converted into heat energy, effectively absorbing the sound wave energy. The second through hole 15 allows part of the airflow to pass through when the fan blades 11 rotate. The fluid flows from the working surface to the non-working surface, changing the fluid velocity distribution within the boundary layer of the non-working surface. This allows the fluid within the boundary layer to gain new kinetic energy to overcome frictional resistance, prevent backflow, suppress eddy current detachment, and reduce aerodynamic load fluctuations on the surface of the fan blades 11, thereby reducing aerodynamic noise. The brushless motor 4 uses electronic commutation technology to directly drive the rotor through sensors and controllers, completely eliminating the source of brush friction noise and reducing the noise of the fan structure. The temperature sensor 6 measures the temperature on one side of the fan structure. When the fuel cell stack temperature is low, the operating speed of the brushless motor 4 can be reduced, reducing the frictional noise between the fan blades 11 and the air, further improving the noise reduction effect.

[0031] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-noise air-cooled fan structure for a fuel cell stack, comprising a fan body (1), characterized in that: The fan body (1) has a mounting cavity (2) at its center, and a mounting bracket (3) is provided inside the mounting cavity (2), and the mounting bracket (3) is fixedly connected to the fan body (1). A brushless motor (4) is provided on one side of the mounting bracket (3), and the brushless motor (4) is connected to the mounting bracket (3) by screws. A fan blade (11) is provided inside the mounting cavity (2), and the fan blade (11) is connected to the output end of the brushless motor (4). A control line (5) is provided on the back of the fan body (1), and the control line (5) is electrically connected to the brushless motor (4). The front end of the fan body (1) is provided with a mounting plate (7), and the mounting plate (7) is integrated with the fan body (1). There is a mounting hole (9) at each of the four corners of the mounting plate (7). A rubber pad (8) is provided on the back of the mounting plate (7), and the rubber pad (8) is in contact with the mounting plate (7). A mounting bolt (10) is provided at the front of the mounting plate (7), and the mounting bolt (10) is corresponding to the mounting hole (9). The mounting bolt (10) is connected to the mounting plate (7) and the rubber pad (8).

2. A fan structure for a low-noise air-cooled fuel cell stack according to claim 1, characterized by: The mounting cavity (2) is provided with a sound-absorbing pad (14), and the sound-absorbing pad (14) is attached to the fan body (1).

3. A fan structure for a low-noise air-cooled fuel cell stack according to claim 2, characterized by: The front end surface of the sound-absorbing pad (14) is provided with a groove (16), and the groove (16) is wavy.

4. The fan structure for a low-noise air-cooled fuel cell stack according to claim 1, characterized by: The fan body (1) is provided with a first through hole (12), and the first through hole (12) is connected to the mounting cavity (2).

5. The fan structure for a low-noise air-cooled fuel cell stack according to claim 1, characterized by: The fan blade (11) is provided with a second through hole (15), which is arranged in a ring at equal intervals.

6. The fan structure for a low-noise air-cooled fuel cell stack according to claim 1, characterized by: A temperature sensor (6) is provided on the back of the mounting bracket (3), and the temperature sensor (6) is fixedly connected to the mounting bracket (3). The temperature sensor (6) is linked to the brushless motor (4).

7. The low-noise air-cooled fuel cell stack fan structure according to claim 1, characterized in that: The mounting plate (7) is provided with a dustproof mesh cover (13) on the front side. The dustproof mesh cover (13) is connected to the fan body (1) by screws. The dustproof mesh cover (13) is arranged parallel to the fan blades (11).

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