A high-speed axial flow fan for aviation with vibration reduction function

Abstract

The present invention discloses an aviation high-speed axial flow fan with a vibration reduction function, and relates to the technical field of axial flow fans. The invention comprises a housing, a driving motor is horizontally installed in the housing, a fan blade is installed on the outer side of the output shaft of the driving motor, a brush plate and an adjustable blade are installed in the fan blade, a support frame is installed on one side of the fan blade, an adjustment film is installed on the support frame, a rotating rod is installed on one side of the adjustment film, the rotating rod adjusts the range of the adjustment film, and then adjusts the air intake, the brush plate cleans the fan blade, the adjustable blade adjusts the windward area of ​​the fan blade, a control panel is installed on the housing, a control system is arranged in the control panel, the rotation angle of the rotating rod is controlled by the control system through coil A, the movement of the brush plate is realized by the cooperation of magnetic plate A and magnetic plate B, and the operation of the fan blade is controlled by the control system through coil B.

Description

Technical Field

[0001] The invention relates to the technical field of axial flow fans, in particular to an aviation high-speed axial flow fan with a vibration reduction function. Background Art

[0002] With the development of the country's aviation industry, axial flow fans are widely used in various airborne electronic equipment. The fan blades are driven by a driving motor to rotate to achieve the air supply function. Most existing axial flow fans adjust the speed of the driving motor to change the air volume and are then used in different occasions. However, in actual use, the method of changing the motor speed has certain requirements on the motor size and cannot meet the complex environmental requirements of the aviation field. In addition, during use, the axial flow fan is easily vibrated due to the influence of external airflow, causing the axial flow fan to collide with external equipment and cause damage to the axial flow fan. Therefore, the existing axial flow fans used in the aviation field have the following main problems: (1) The air volume adjustment method is single and cannot meet the complex environmental requirements of the aviation field; (2) The axial flow fan is not subjected to vibration reduction treatment, which reduces the life of the axial flow fan. Summary of the invention

[0003] The object of the present invention is to provide an aviation high-speed axial flow fan with a vibration reduction function to solve the problems raised in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising a shell, a driving motor is horizontally installed in the shell, a fan blade is installed on the outer side of the output shaft of the driving motor, a brush plate and an adjustable blade are installed in the fan blade, a support frame is installed on one side of the fan blade, an adjusting film is installed on the support frame, a rotating rod is installed on one side of the adjusting film, the rotating rod adjusts the range of the adjusting film, and then adjusts the air intake, the brush plate cleans the fan blade, the adjustable blade adjusts the windward area of ​​the fan blade, a control panel is installed on the shell, and a control system is arranged in the control panel.

[0005] A coil A and a coil B are sleeved on the output shaft of the driving motor, a fan shaft is installed on the outer side of the coil A, the fan shaft is hollow inside, and the fan shaft is installed on the output shaft of the driving motor through a bearing, a magnetorheological fluid A is arranged in the fan shaft, the coil A is immersed in the magnetorheological fluid A, and both ends of the coil A are electrically connected to the control system, a rotating disk is installed on the outer side of the coil B, the rotating disk is hollow inside, and both ends of the rotating disk are installed on the output shaft of the driving motor through bearings, a magnetorheological fluid B is arranged in the middle of the rotating disk, the coil B is immersed in the magnetorheological fluid B, and both ends of the coil B are electrically connected to the control system.

[0006] A magnetic plate A and a magnetic plate B are installed in the shell near the fan blades, and the magnetic plate A is installed on one side of the magnetic plate B. The magnetic plate A and the magnetic plate B are electrically connected to the control system. The magnetic fields of the magnetic plates A and B are different after being energized. The fan blades are installed on the fan shaft, and the fan blades are arranged in multiple groups. The inside of the fan blades is hollow, and the adjustable blades are slidably installed in the fan blades through springs A. The adjustable blades are arranged in multiple groups, and the spring A is electrically connected to the control system. The brush plate is arranged on one side of the adjustable blades, and the brush plate is installed in the fan blades through a spring sliding seal. A heat-conducting medium is arranged on one side of the brush plate, and a conductor is arranged on one side of the heat-conducting medium, and the conductor is electrically connected to the control system.

[0007] The support frame is installed on the outer shell, and the adjustment membrane is provided with multiple groups. One end of the multiple groups of adjustment membranes is installed on the support frame, and both sides of the adjustment membrane are connected to the support frame in a sliding seal. The other end of the multiple groups of adjustment membranes is installed on the rotating rod, and the multiple groups of rotating rods are installed on the rotating disk. The fan shaft and the rotating disk are sealed to the magnetorheological fluid A and the magnetorheological fluid B respectively. The coil A is installed on the fan shaft, and the coil B is installed on the rotating disk.

[0008] The control system energizes coil A, and a magnetic field is generated between each turn of coil A. The magnetic field causes the magnetorheological fluid A to change from a low-viscosity Newtonian fluid state to a high-viscosity, low-fluidity Bingham fluid state. The shear yield stress of magnetorheological fluid A is significantly increased, and the torque can be transmitted to drive the motor to work. The friction force of magnetorheological fluid A on the inner wall of the fan shaft and coil A increases, and the drive motor drives coil A and the fan shaft to rotate through magnetorheological fluid A, and the fan shaft drives the fan blades to rotate. The fan blades push the air forward in an oblique manner, thereby realizing the blowing function of the axial flow fan.

[0009] After long-term operation, dust will adhere to the surface of the fan blades and the outer shell of the fan blades. The dust increases the resistance of the fan blades during rotation, the resistance between the fan shaft and the magnetorheological fluid A, and the resistance between the magnetorheological fluid A and the output shaft of the drive motor. The pressure sensor in the drive motor detects data lower than the set value, and it is judged that the axial flow fan can continue to work after increasing the torque of the drive motor. Therefore, it is necessary to increase the torque of the drive motor to ensure the normal operation of the fan blades. The size of the torque that can be transmitted by the magnetorheological fluid A and the output torque of the drive motor are matched. When the torque of the drive motor increases, the current passed through the coil A increases, the magnetic field of the coil A is enhanced, and the torque that can be transmitted by the magnetorheological fluid A increases.

[0010] When the value of the pressure sensor exceeds the set upper limit, the control system determines that the fan blade surface and the outer shell of the fan blade need to be cleaned. The control system energizes magnetic plate A and magnetic plate B. Magnetic plates A and magnetic plate B generate opposite magnetic fields, and the drive motor drives the fan blade to rotate. The transmission process of fan blade rotation is the same as above. The control system connects the conductor to the circuit. The conductor in the fan blade cuts the magnetic flux lines, and the conductor will heat up. The conductor transfers the heat to the heat-conducting medium. The heat-conducting medium absorbs heat and expands, thereby increasing the pressure in the chamber between the brush plate and the fan blade. The heat-conducting medium pushes the brush plate to move outward, so that the brush plate contacts the outer shell of the fan blade. The brush on the brush plate is pressed on the outer shell, which can clean the outer shell and bend toward the surface of the fan blade, that is, the brush contacts the outer shell of the fan blade and the surface of the fan blade. The surface of the fan blade is cleaned by the collision between the brush and the fan blade.

[0011] The air volume of the axial flow fan is designed to be adjustable, which can adapt to the complex environmental requirements of the aviation field. The control system cuts off the power of coil A and energizes coil B. The magnetic field between each turn of coil A disappears, and the magnetorheological fluid A is affected by the disappearance of the magnetic field and changes from a high-viscosity, low-fluidity Bingham fluid state to a low-viscosity Newtonian fluid state. The shear yield stress of the magnetorheological fluid A in the low-viscosity Newtonian fluid state is significantly reduced, and the torque cannot be transmitted. The friction force of the magnetorheological fluid A on the fan shaft and coil A is reduced, and the output shaft of the drive motor idles in the fan shaft and does not transmit torque; a magnetic field is generated between each turn of coil B, and the magnetic field causes the magnetorheological fluid B to change from a low-viscosity Newtonian fluid state to a high-viscosity, low-fluidity Bingham fluid state. Similar to the magnetorheological fluid A, the drive motor drives the rotating disk to rotate a certain angle, the rotating disk drives the rotating rod to rotate a certain angle, and the rotating rod drives the regulating membrane to gradually unfold from a wrinkled state.

[0012] A plurality of sleeve structures are provided on the outer shell near the driving motor side, and a buffer pad is slidably installed in the plurality of sleeve structures through a spring, one side of the buffer pad is composed of a rubber material and a magnetic material, and an adjustable spring is sleeved on the other side of the buffer pad, and a contact ring is contacted on the inner side of the adjustable spring, and both ends of the adjustable spring are electrically connected to the control system, and the contact ring is electrically connected to the control system, the adjustable spring is installed on the sleeve structure, and the contact ring is installed on the buffer pad, and a mounting hole is provided on the buffer pad.

[0013] The heat-conducting medium is made of a material that expands when heated, the conductor is within the magnetic field range of magnetic plates A and B, the regulating membrane is a fan-shaped telescopic structure, a wind speed sensor is installed on the outer casing close to the fan blades, the wind speed sensor is electrically connected to the control system, the drive motor has a built-in encoder and a pressure sensor, and a plurality of brushes are arranged on the brush plate, and the plurality of brushes are made of elastic material.

[0014] The maximum area of ​​a single regulating membrane is S 1, the inner diameter of the support frame is r, the outer diameter of the support frame is D, the thickness of the support frame is negligible, the number of adjustment films is N, N is a positive integer, and N ≥ 4;

[0015] The control system calculates the maximum area S of a single adjustment film according to the calculation formula 1 , the specific calculation formula is as follows:

[0016] S 1 =π(Dr) 2 / N.

[0017] The angle of rotation of the adjusting film driven by the rotating rod is n, and 0°≤n≤90°. When the adjusting film is rotated by the rotating rod by n, the unfolded area of ​​the adjusting film is S. 0 ;

[0018] The control system calculates the expansion area S of a single regulating membrane according to the calculation formula 0 , the specific calculation formula is as follows:

[0019] S 0 =nNπ(Dr) 2 / 1440;

[0020] When n=0°, S 0 =0, when n = 90°, S 1 =S 0 .

[0021] The wind speed sensor detects the wind speed when the fan blades rotate as v 0 The fan blades exhaust air volume q 0 , the outlet area of ​​the fan blade when exhausting air is S 2 , the control system is based on the calculation formula S 2 =N(S 1 -S 0 ), and S 1 =π(Dr) 2 / N and S 0 =nNπ(Dr) 2 / 1440 is substituted into the equation to calculate S 2 , the specific calculation formula is as follows:

[0022] S 2 =π(Dr) 2 [1-(nN 2 / 1440)].

[0023] The control system is based on the calculation formula q 0 =v 0 S 2 , and S 2 =π(Dr) 2 [1-(nN2 / 1440)] and calculate q 0 , the specific calculation formula is as follows:

[0024] q 0 =v 0 π(Dr) 2 [1-(nN 2 / 1440)];

[0025] The control system adjusts the rotation angle of the rotating rod and compares it with the wind speed v of the flow sensor. 0 To adjust the air volume q discharged by the fan blades 0 .

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0027] 1. The adjustable air volume design can adapt to the complex environmental requirements in the aviation field. The control system can adjust the moving distance of the adjustable blades through spring A, thereby adjusting the range of the fan blades. The control system reduces the current passed into spring A. As the current decreases, the magnetic field of mutual attraction generated between each turn of spring A weakens. The elastic force of spring A itself is greater than the attraction of the magnetic field of two adjacent turns. Spring A will become longer under the action of the elastic force, and spring A pushes the adjustable blades to move to the outside of the fan blades. When the drive motor drives the fan blades to rotate, the adjustable blades extend from the fan blades, and the range of air pushed by the fan blades becomes larger, thereby pushing more air for transportation; the control system adjusts the rotation angle of the rotating rod through the data of the wind speed sensor and the rotation data of the encoder in the drive motor, thereby adjusting the expansion range of the adjustment membrane to achieve the purpose of adjusting the air volume of the axial flow fan. The larger the angle of rotation of the rotating rod, the more the adjustment membrane is expanded, and the smaller the air volume of the axial flow fan.

[0028] 2. Automatic vibration reduction to increase the service life of the axial flow fan. The control system energizes the left end of the adjustable spring and the contact ring. After the adjustable spring is energized, a magnetic field will be generated at both ends. When the outer shell drives the sleeve structure to move to the left, the sleeve structure stretches the spring, and the number of turns between the contact ring and the left end of the adjustable spring increases. The magnetic field of the adjustable spring becomes stronger, and the magnetic field of the adjustable spring is different from the magnetic material on the buffer pad. The magnetic field of the adjustable spring and the magnetic material of the buffer pad attract each other, so the magnetic field of the adjustable spring prevents the outer shell and the sleeve structure from continuing to move to the left, achieving the purpose of buffering and vibration reduction. The more the outer shell moves to the left, the greater the attraction of the magnetic field of the adjustable spring to the buffer pad, and the axial flow fan can be treated for vibration reduction.

[0029] 3. Fan blade dust monitoring can clean the fan blades in time to ensure that the axial flow fan is in normal working condition. The control system energizes magnetic plate A and magnetic plate B, and magnetic plate A and magnetic plate B generate opposite magnetic fields. The drive motor drives the fan blades to rotate. The transmission process of fan blade rotation is the same as above. The control system connects the conductor to the circuit. The conductor in the fan blade cuts the magnetic flux lines, and the conductor will heat up. The conductor transfers the heat to the heat-conducting medium. The heat-conducting medium absorbs the heat and expands, increasing the pressure in the chamber between the brush plate and the fan blade. The heat-conducting medium pushes the brush plate outward, so that the brush plate contacts the outer shell of the fan blade. The brush on the brush plate is pressed on the outer shell, which can clean the outer shell and bend toward the surface of the fan blade, that is, the brush contacts the outer shell of the fan blade and the surface of the fan blade. The collision between the brush and the fan blade can achieve surface cleaning of the fan blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 yes Figure 1 Schematic diagram of the structure without the control panel and the regulating membrane;

[0033] Figure 3 yes Figure 2 Side view of

[0034] Figure 4 yes Figure 1 Left side cross-sectional view;

[0035] Figure 5 yes Figure 4 A partial enlarged view of the middle A area;

[0036] Figure 6 yes Figure 4 A partial enlarged view of the middle B area;

[0037] Figure 7 It is a schematic diagram of the installation structure of the fan blades and the fan shaft;

[0038] Figure 8 It is a schematic diagram of the internal structure of the fan blade;

[0039] Fig. 9 yes Figure 8 A partial enlarged view of the middle C area;

[0040] Fig.10 It is a schematic diagram of the sleeve structure on the outer shell and the internal structure of the buffer pad.

[0041] In the figure: 1. control panel; 11. housing; 12. coil A; 121. magnetorheological fluid A; 13. coil B; 131. magnetorheological fluid B; 2. drive motor; 21. fan shaft; 22. fan blades; 221. brush plate; 222. adjustable blades; 223. spring A; 23. magnetic plate A; 231. magnetic plate B; 24. heat conducting medium; 25. conductor; 3. buffer pad; 31. adjustment membrane; 32. support frame; 33. rotating rod; 34. rotating disk; 35. adjustable spring; 36. contact ring. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figure 1-Figure 10 The present invention provides a technical solution: it includes a shell 11, a driving motor 2 is horizontally installed in the shell 11, a fan blade 22 is installed on the outer side of the output shaft of the driving motor 2, a brush plate 221 and an adjustable blade 222 are installed in the fan blade 22, a support frame 32 is installed on one side of the fan blade 22, an adjustment film 31 is installed on the support frame 32, a rotating rod 33 is installed on one side of the adjustment film 31, the rotating rod 33 adjusts the range of the adjustment film 31, and then adjusts the air intake, the brush plate 221 cleans the fan blade 22, and the adjustable blade 222 adjusts the windward area of ​​the fan blade 22, a control panel 1 is installed on the shell 11, and a control system is arranged in the control panel 1.

[0044] The output shaft of the driving motor 2 is sleeved with a coil A12 and a coil B13. A fan shaft 21 is installed on the outside of the coil A12. The fan shaft 21 is hollow inside. The fan shaft 21 is installed on the output shaft of the driving motor 2 through a bearing. A magnetorheological fluid A121 is arranged inside the fan shaft 21. The coil A12 is immersed in the magnetorheological fluid A121. Both ends of the coil A12 are electrically connected to the control system. A rotating disk 34 is installed on the outside of the coil B13. The rotating disk 34 is hollow inside. Both ends of the rotating disk 34 are installed on the output shaft of the driving motor 2 through bearings. The magnetorheological fluid B131 is arranged in the middle of the rotating disk 34. The coil B1 3 is immersed in the magnetorheological fluid B131, both ends of the coil B13 are electrically connected to the control system, the support frame 32 is installed on the housing 11, multiple groups of adjustment membranes 31 are provided, one end of the multiple groups of adjustment membranes 31 is installed on the support frame 32, both sides of the adjustment membranes 31 are connected to the support frame 32 in a sliding and sealing manner, the other ends of the multiple groups of adjustment membranes 31 are installed on the rotating rods 33, the multiple groups of rotating rods 33 are installed on the rotating disk 34, the fan shaft 21 and the rotating disk 34 are sealed to the magnetorheological fluid A121 and the magnetorheological fluid B131 respectively, the coil A12 is installed on the fan shaft 21, and the coil B13 is installed on the rotating disk 34.

[0045] A magnetic plate A23 and a magnetic plate B231 are installed in the housing 11 near the fan blade 22. The magnetic plate A23 is installed on one side of the magnetic plate B231. The magnetic plates A23 and B231 are electrically connected to the control system. The magnetic fields of the magnetic plates A23 and B231 are different after being energized. The fan blade 22 is installed on the fan shaft 21. The fan blade 22 is provided with multiple groups. The inside of the fan blade 22 is hollow. The adjustable blade 222 is slidably installed in the fan blade 22 through the spring A223. The adjustable blade 222 is provided with multiple groups. The spring A223 is electrically connected to the control system. The brush plate 221 is provided on one side of the adjustable blade 222. The brush plate 22 1 is installed in the fan blade 22 through a spring sliding seal, a heat conducting medium 24 is arranged on one side of the brush plate 221, a conductor 25 is arranged on one side of the heat conducting medium 24, the conductor 25 is electrically connected to the control system, the heat conducting medium 24 is made of a material that expands when heated, the conductor 25 is within the magnetic field range of the magnetic plate A23 and the magnetic plate B231, the adjustment film 31 is a fan-shaped telescopic structure, a wind speed sensor is installed on the housing 11 close to the fan blade 22, the wind speed sensor is electrically connected to the control system, the drive motor 2 has an encoder and a pressure sensor built in, and a plurality of brushes are arranged on the brush plate 221, and the plurality of brushes are made of elastic material.

[0046] A plurality of sleeve structures are provided on the outer casing 11 near the driving motor 2, and a buffer pad 3 is slidably installed in the plurality of sleeve structures through a spring, one side of the buffer pad 3 is composed of a rubber material and a magnetic material, and an adjustable spring 35 is sleeved on the other side of the buffer pad 3, and a contact ring 36 is in contact with the inner side of the adjustable spring 35, and both ends of the adjustable spring 35 are electrically connected to the control system, and the contact ring 36 is electrically connected to the control system, the adjustable spring 35 is installed on the sleeve structure, and the contact ring 36 is installed on the buffer pad 3, and a mounting hole is provided on the buffer pad 3.

[0047] The working principle of the present invention is as follows: the axial flow fan is installed and fixed through the mounting holes on the buffer pad 3 .

[0048] Press the start button on the control panel 1 to start the device. The staff sets the upper limit value of the pressure sensor in the drive motor 2 through the control panel 1, and then sets the air volume of the axial flow fan. The control system energizes the spring A223. After the spring A223 is energized, a mutually attractive magnetic field is generated between each turn. The mutually attractive magnetic field causes the spring A223 to shorten after being energized. Since one end of the spring A223 is installed on the fan blade 22 and the other end is installed on the adjustable blade 222, the spring A223 pulls the adjustable blade 222 to move inwardly of the fan blade 22 until the outermost side of the adjustable blade 222 is flush with the edge of the fan blade 22.

[0049] The control system energizes the coil A12, and a magnetic field is generated between each turn of the coil A12. The magnetic field causes the magnetorheological fluid A121 to change from a low-viscosity Newtonian fluid state to a high-viscosity, low-fluidity Bingham fluid state. The shear yield stress of the magnetorheological fluid A121 is significantly increased, and the drive motor 2 works. The drive motor 2 drives the coil A12 and the fan shaft 21 to rotate through the magnetorheological fluid A121, and the fan shaft 21 drives the fan blades 22 to rotate. The fan blades 22 push the air forward in an oblique manner, thereby realizing the blowing function of the axial flow fan.

[0050] After long-term operation, dust will adhere to the surface of the fan blade 22 and the outer shell 11 of the fan blade 22. The dust increases the resistance of the fan blade 22 during rotation, the resistance between the fan shaft 21 and the magnetorheological fluid A121, and the resistance between the magnetorheological fluid A121 and the output shaft of the drive motor 2. The pressure sensor in the drive motor 2 detects data lower than the set value, and it is judged that the axial flow fan can continue to work after increasing the torque of the drive motor 2. Therefore, it is necessary to increase the torque of the drive motor 2 to ensure the normal operation of the fan blade 22. The size of the torque that can be transmitted by the magnetorheological fluid A121 and the output torque of the drive motor 2 are matched. When the torque of the drive motor 2 increases, the current passed through the coil A12 increases, the magnetic field of the coil A12 is enhanced, and the torque that can be transmitted by the magnetorheological fluid A121 increases.

[0051] The magnitude of the torque that can be transmitted by the magnetorheological fluid A121 is determined by the strength of the magnetic field it is subjected to, that is, the magnitude of the magnetic field after the coil A12 is energized. The magnitude of the magnetic field of the coil A12 is determined by the magnitude of the current passed through it. Therefore, the control system adjusts the magnitude of the torque that can be transmitted by the magnetorheological fluid A121 by adjusting the magnitude of the current passed through the coil A12. The output torque of the drive motor 2 is monitored in real time by the pressure sensor, and the data is fed back to the control system. The control system adjusts the magnitude of the current passed through the coil A12 according to the data from the pressure sensor.

[0052] When the value of the pressure sensor exceeds the set upper limit, the control system determines that the surface of the fan blade 22 and the outer shell 11 of the fan blade 22 need to be cleaned, and the control system energizes the magnetic plate A23 and the magnetic plate B231. The magnetic plates A23 and the magnetic plates B231 generate opposite magnetic fields, and the drive motor 2 drives the fan blade 22 to rotate. The transmission process of the rotation of the fan blade 22 is the same as above. The control system connects the conductor 25 to the circuit, and the conductor 25 in the fan blade 22 cuts the magnetic flux lines, and the conductor 25 will heat up. The conductor 25 transfers the heat to the heat conductive medium. 24. The heat-conducting medium 24 absorbs heat and expands, which increases the pressure in the chamber between the brush plate 221 and the fan blade 22. The heat-conducting medium 24 pushes the brush plate 221 to move outward, so that the brush plate 221 contacts the outer shell 11 on the outside of the fan blade 22. The brush on the brush plate 221 is pressed against the outer shell 11, which can clean the outer shell 11, and bends toward the surface of the fan blade 22, that is, the brush contacts the outer shell 11 and the surface of the fan blade 22 on the outside of the fan blade 22, and the surface of the fan blade 22 is cleaned by the collision between the brush and the fan blade 22.

[0053] The air volume of the axial flow fan is designed to be adjustable, which can adapt to the complex environmental requirements of the aviation field. The control system cuts off the power to coil A12 and turns on the power to coil B13. The magnetic field between each turn of coil A12 disappears, and the magnetorheological fluid A121 is affected by the disappearance of the magnetic field and changes from a high-viscosity, low-fluidity Bingham fluid state to a low-viscosity Newtonian fluid state. The shear yield stress of the magnetorheological fluid A121 in the low-viscosity Newtonian fluid state is significantly reduced, and the torque cannot be transmitted. The friction force of the magnetorheological fluid A121 on the fan shaft 21 and the coil A12 is reduced, and the output shaft of the drive motor 2 is empty in the fan shaft 21. It rotates but does not transmit torque; a magnetic field is generated between each turn of the coil B13, and the magnetic field causes the magnetorheological fluid B131 to change from a low-viscosity Newtonian fluid state to a high-viscosity, low-fluidity Bingham fluid state. Similar to the magnetorheological fluid A121, the driving motor 2 drives the rotating disk 34 to rotate a certain angle, and the rotating disk 34 drives the rotating rod 33 to rotate a certain angle. The rotating rod 33 drives the regulating membrane 31 to gradually unfold from a wrinkled state, and the air is discharged through the position between the regulating membrane 31 and the support frame 32. Since the regulating membrane 31 blocks the air, the air volume driven by the fan blades 22 changes.

[0054] During the operation of the driving motor 2, the internal encoder monitors the rotation data of the driving motor 2 in real time and feeds the data back to the control system. The wind speed sensor monitors the blowing speed of the axial flow fan in real time and feeds the data back to the control system. The control system adjusts the rotation angle of the rotating rod 33 and further adjusts the expansion range of the regulating film 31 according to the setting data of the required air volume set by the staff in advance through the control panel 1 through the data of the wind speed sensor and the rotation data of the encoder in the driving motor 2, so as to achieve the purpose of adjusting the air volume of the axial flow fan. The greater the rotation angle of the rotating rod 33, the more the regulating film 31 is expanded, and the smaller the air volume of the axial flow fan.

[0055] The control system adjusts the expansion range of the adjustment film 31 by coordinating the data of the wind speed sensor and the rotation data of the rotating rod 33 detected by the encoder in the drive motor 2, and then adjusts the air volume of the axial flow fan. The coordination process of the control system, the wind speed sensor and the rotating rod 33 is as follows:

[0056] The maximum area of ​​a single adjustment film 31 is S 1 , the inner diameter of the support frame 32 is r, the outer diameter of the support frame 32 is D, the thickness of the support frame 32 is negligible, the number of the adjustment membranes 31 is N, N is a positive integer, and N≥4;

[0057] The control system calculates the maximum area S of a single adjustment film 31 according to the calculation formula 1 , the specific calculation formula is as follows:

[0058] S 1 =π(Dr) 2 / N.

[0059] The angle of rotation of the adjusting film 31 driven by the rotating rod 33 is n, and 0°≤n≤90°. When the adjusting film 31 is rotated by the rotating rod 33 by n, the unfolded area of ​​the adjusting film 31 is S. 0 ;

[0060] The control system calculates the expansion area S of a single adjustment film 31 according to the calculation formula 0 , the specific calculation formula is as follows:

[0061] S 0 =nNπ(Dr) 2 / 1440;

[0062] When n=0°, S 0 =0, when n = 90°, S 1 =S 0 .

[0063] The wind speed sensor detects the wind speed when the fan blade 22 rotates as v 0, and feeds the data back to the control system. The air volume discharged by the fan blade 22 is q 0 , the outlet area of ​​the fan blade 22 when exhausting air is S 2 , the control system is based on the calculation formula S 2 =N(S 1 -S 0 ), and S 1 =π(Dr) 2 / N and S 0 =nNπ(Dr) 2 / 1440 is substituted into the equation to calculate S 2 , the specific calculation formula is as follows:

[0064] S 2 =π(Dr) 2 [1-(nN 2 / 1440)].

[0065] The control system is based on the calculation formula q 0 =v 0 S 2 , and S 2 =π(Dr) 2 [1-(nN 2 / 1440)] and calculate q 0 , the specific calculation formula is as follows:

[0066] q 0 =v 0 π(Dr) 2 [1-(nN 2 / 1440)];

[0067] The control system adjusts the rotation angle of the rotating rod 33 and the wind speed v of the flow velocity sensor. 0 To adjust the air volume q discharged by the fan blade 22 0 .

[0068] The axial flow fan used in aviation is very susceptible to the influence of external airflow, which causes vibration, and has adverse effects on the drive motor 2 and the fan blades 22 and other components inside the axial flow fan, reducing the service life of the axial flow fan. Therefore, it is necessary to perform vibration reduction treatment on the axial flow fan. The control system first detects the vibration direction of the axial flow fan, and then performs vibration reduction treatment on the axial flow fan. The control system passes current through the right end of the adjustable spring 35 and the contact ring 36. When the housing 11 of the axial flow fan moves to the left, the sleeve structure on the housing 11 drives the adjustable spring 35 to move to the left, so that The distance between the right end of the adjustable spring 35 and the contact ring 36 decreases, and the number of turns between the right end of the adjustable spring 35 and the contact ring 36 decreases. The current flows into the contact ring 36 and flows out of the right end of the adjustable spring 35. Due to the decrease in the number of turns, the resistance value of the adjustable spring 35 connected to the circuit becomes smaller, and the current flowing through the adjustable spring 35 becomes larger. The control system detects the current and feeds the data back to the control system. When the current increases, it is judged that the axial flow fan is moving to the left. Similarly, after the control system obtains the data, it cuts off the power to the adjustable spring 35 and the contact ring 36.

[0069] According to the detected vibration direction of the axial flow fan, when the axial flow fan moves to the left, the control system energizes the left end of the adjustable spring 35 and the contact ring 36 again; when the axial flow fan moves to the right, the control system energizes the right end of the adjustable spring 35 and the contact ring 36 again;

[0070] The following takes the axial flow fan moving to the left as an example. The control system energizes the left end of the adjustable spring 35 and the contact ring 36. After the adjustable spring 35 is energized, a magnetic field will be generated at both ends. When the outer shell 11 drives the sleeve structure to move to the left, the sleeve structure stretches the spring, and the number of turns between the contact ring 36 and the left end of the adjustable spring 35 increases, and the magnetic field of the adjustable spring 35 becomes stronger. In addition, the magnetic field of the adjustable spring 35 is different from the magnetic material on the buffer pad 3. The magnetic field of the adjustable spring 35 and the magnetic material of the buffer pad 3 attract each other. Therefore, the magnetic field of the adjustable spring 35 hinders the outer shell 11 and the sleeve structure from continuing to move to the left, thereby achieving the purpose of buffering and vibration reduction. Moreover, the more the outer shell 11 moves to the left, the greater the attraction of the magnetic field of the adjustable spring 35 to the buffer pad 3, and the axial flow fan can be subjected to vibration reduction treatment. The axial flow fan moves to the right, and the same is true for the above.

[0071] The fan blade 22 and the adjustable blade 222 are designed to be adjustable. The control system can adjust the moving distance of the adjustable blade 222 through the spring A223, thereby realizing the adjustment of the range of the fan blade 22. The control system reduces the current passed into the spring A223. As the current becomes smaller, the elastic force of the spring A223 itself is greater than the attraction of the two adjacent turns of the magnetic field. The spring A223 will become longer under the action of the elastic force, and the spring A223 pushes the adjustable blade 222 to move toward the outside of the fan blade 22. When the driving motor 2 drives the fan blade 22 to rotate, the specific transmission process is the same as above. Since the adjustable blade 222 extends from the fan blade 22, the range of the air pushed by the fan blade 22 becomes larger, and more air can be pushed for transportation. The distance that the adjustable blade 222 extends is determined by the current of the spring A223. The smaller the current of the spring A223, the greater the distance that the adjustable blade 222 extends, and the more air the fan blade 22 can transport. Therefore, the control system can adjust the range of the air pushed by the fan blade 22 by adjusting the current of the spring A223.

[0072] Press the stop button on the control panel 1 to power off the device.

[0073] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0074] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-speed axial flow fan for aviation with a vibration reduction function, characterized in that: The invention comprises a housing (11), wherein a driving motor (2) is horizontally mounted in the housing (11), a fan blade (22) is mounted on the outer side of the output shaft of the driving motor (2), a brush plate (221) and an adjustable blade (222) are mounted in the fan blade (22), a support frame (32) is mounted on one side of the fan blade (22), an adjusting film (31) is mounted on the support frame (32), a rotating rod (33) is mounted on one side of the adjusting film (31), the rotating rod (33) adjusts the range of the adjusting film (31) and thus adjusts the air intake, the brush plate (221) cleans the fan blade (22), and the adjustable blade (222) adjusts the windward area of ​​the fan blade (22), a control panel (1) is mounted on the housing (11), and a control system is arranged in the control panel (1); The output shaft of the drive motor (2) is sleeved with a coil A (12) and a coil B (13); a fan shaft (21) is mounted on the outer side of the coil A (12); the fan shaft (21) is hollow inside; the fan shaft (21) is mounted on the output shaft of the drive motor (2) via a bearing; a magnetorheological fluid A (121) is arranged inside the fan shaft (21); the coil A (12) is immersed in the magnetorheological fluid A (121); both ends of the coil A (12) are electrically connected to a control system; a rotating disk (34) is mounted on the outer side of the coil B (13); the rotating disk (34) is hollow inside; both ends of the rotating disk (34) are mounted on the output shaft of the drive motor (2) via bearings; a magnetorheological fluid B (131) is arranged in the middle of the rotating disk (34); the coil B (13) is immersed in the magnetorheological fluid B (131); and both ends of the coil B (13) are electrically connected to a control system; A magnetic plate A (23) and a magnetic plate B (231) are installed in the housing (11) near the fan blade (22). The magnetic plate A (23) is installed on one side of the magnetic plate B (231). The magnetic plate A (23) and the magnetic plate B (231) are electrically connected to a control system. The magnetic fields of the magnetic plate A (23) and the magnetic plate B (231) are different after being energized. The fan blade (22) is installed on the fan shaft (21). The fan blade (22) is provided with a plurality of groups. The fan blade (22) is hollow inside. The adjustable blade (222) is A spring A (223) is slidably mounted in the fan blade (22), the adjustable blade (222) is mounted in multiple groups, the spring A (223) is electrically connected to a control system, the brush plate (221) is arranged on one side of the adjustable blade (222), the brush plate (221) is mounted in the fan blade (22) via a spring sliding seal, a heat conducting medium (24) is arranged on one side of the brush plate (221), a conductor (25) is mounted on one side of the heat conducting medium (24), and the conductor (25) is electrically connected to a control system; The support frame (32) is mounted on the housing (11); a plurality of adjustment membranes (31) are provided; one end of the plurality of adjustment membranes (31) is mounted on the support frame (32); both sides of the adjustment membranes (31) are connected to the support frame (32) in a sliding and sealing manner; the other ends of the plurality of adjustment membranes (31) are mounted on a rotating rod (33); the plurality of rotating rods (33) are mounted on a rotating disk (34); the fan shaft (21) and the rotating disk (34) respectively seal the magnetorheological fluid A (121) and the magnetorheological fluid B (131); the coil A (12) is mounted on the fan shaft (21); and the coil B (13) is mounted on the rotating disk (34); The heat-conducting medium (24) is made of a material that expands when heated. The conductor (25) is within the magnetic field range of the magnetic plate A (23) and the magnetic plate B (231). The regulating membrane (31) is a fan-shaped telescopic structure. A wind speed sensor is installed on the housing (11) near the fan blade (22). The wind speed sensor is electrically connected to a control system. The drive motor (2) has an encoder and a pressure sensor built in. A plurality of brushes are provided on the brush plate (221). The plurality of brushes are made of an elastic material.

2. The high-speed axial flow fan for aviation with vibration reduction function according to claim 1, characterized in that: A plurality of sleeve structures are provided on the housing (11) on a side close to the drive motor (2), and a buffer pad (3) is slidably mounted in the plurality of sleeve structures via a spring, one side of the buffer pad (3) being composed of a rubber material and a magnetic material, and the other side of the buffer pad (3) being sleeved with an adjustable spring (35), the inner side of the adjustable spring (35) being in contact with a contact ring (36), both ends of the adjustable spring (35) being electrically connected to a control system, and the contact ring (36) being electrically connected to the control system, the adjustable spring (35) being mounted on the sleeve structure, and the contact ring (36) being mounted on the buffer pad (3), and a mounting hole being provided on the buffer pad (3).

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