Axial fan assembly and its control method

Abstract

This invention discloses an axial flow fan assembly and its control method. The axial flow fan assembly includes a fan shroud, fan blades disposed within the fan shroud, a fan motor driving the fan blades to rotate, and a pressure balancing device. The pressure balancing device includes a housing, a piston, and a pressure balancing motor. Both the housing and the pressure balancing motor are detachably fixed to the outer wall of the fan shroud. The piston is slidably disposed within the housing, dividing the inner cavity of the housing into a first chamber and a second chamber. Both ends of the first and second chambers have openings facing away from each other, with the openings of the first and second chambers respectively facing the fan blades. The pressure balancing motor is driven by the piston, driving the piston to move along the length of the housing within the inner cavity. The pressure balancing device can balance the high and low air pressures generated on the surface of the fan blades during rotation. Therefore, this axial flow fan assembly has the advantage of good noise reduction performance.

Description

Technical Field

[0001] This invention relates to the automotive field, and more particularly to an axial fan assembly and its control method. Background Technology

[0002] Automotive cooling fans are responsible for cooling the engine and air conditioning system. Automotive cooling fans are generally axial flow fans. During operation, the high-speed airflow caused by the fan blades cutting through the air generates significant aerodynamic noise, negatively impacting the overall comfort of the vehicle. The noise primarily originates from the high-speed rotating and periodically cutting air by the fan blades; therefore, the noise level is related to the fan's rotational speed and the number of blades, exhibiting a distinct periodicity. Common methods to reduce noise during fan operation include optimizing the fan blades and shroud, but these methods offer limited reductions.

[0003] Therefore, existing cooling fans have the problem of being noisy. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of excessive noise in existing cooling fans.

[0005] To address the aforementioned problems, one embodiment of the present invention provides an axial fan assembly, including a fan shroud, fan blades disposed within the fan shroud, a fan motor for driving the fan blades to rotate, and a pressure balancing device detachably connected to the outer wall of the fan shroud. The pressure balancing device includes a housing, a piston, and a pressure balancing motor, both of which are fixedly and detachably connected to the outer wall of the fan shroud. The piston is slidably disposed within the housing, dividing the inner cavity of the housing into a first chamber and a second chamber. Both ends of the first and second chambers, facing away from each other, have openings. The openings of the first and second chambers respectively face the fan blades. The pressure balancing motor is drively connected to the piston, driving the piston to move along the length of the housing within its inner cavity.

[0006] When the pressure balancing motor drives the piston to move towards the opening of the first chamber, the air pressure at the position on the fan blade corresponding to the opening of the first chamber increases, while the air pressure at the position corresponding to the opening of the second chamber decreases.

[0007] When the pressure balancing motor drives the piston to move towards the opening of the second chamber, the air pressure at the position on the fan blade corresponding to the opening of the second chamber increases, while the air pressure at the position corresponding to the opening of the first chamber decreases.

[0008] By employing the above technical solution, the air pressure balancing device can balance the high and low air pressures generated on the fan blade surface during rotation. Specifically, during fan blade rotation, regularly distributed high and low pressure zones form on the fan blade surface. When a high-pressure zone on the fan blade surface moves to the opening of the air pressure balancing device's housing, the piston draws air from the housing, creating low pressure to balance the high pressure on the fan blade surface. Conversely, when a low-pressure zone on the fan blade surface moves to the opening of the air pressure balancing device's housing, the piston compresses the air from the housing, creating high pressure to balance the low pressure on the fan blade surface. This axial fan assembly fundamentally reduces noise generation, thus significantly lowering noise levels. Therefore, this axial fan assembly has the advantage of excellent noise reduction performance.

[0009] Another embodiment of the present invention provides an axial fan assembly, wherein the air pressure balancing device further includes a transmission component, the transmission component including a connecting rod and a crankshaft, the air pressure balancing motor being connected to the crankshaft to drive the crankshaft to rotate relative to the housing about a pivot, one end of the connecting rod being rotatably connected to the crankshaft, and the other end of the connecting rod being rotatably connected to the piston; by rotating the crankshaft, the connecting rod is driven to be in an extended state or a retracted state, so that the piston can move along the length direction of the housing inside the housing.

[0010] Using the above technical solution, the rotation of the crankshaft drives the connecting rod to be in an extended or retracted state, thereby enabling the piston to squeeze or draw air inside the housing along the length of the housing, forming high and low air pressures, which in turn balances the high and low air pressures formed on the surface of the fan blades during rotation.

[0011] Another embodiment of the present invention provides an axial fan assembly, wherein the air pressure balancing device includes two pistons and two connecting rods; one end of the two connecting rods is respectively connected to different sides of the crankshaft, and the other end is respectively connected to the two pistons, and when one connecting rod is in the extended state, the other connecting rod is in the retracted state.

[0012] By adopting the above technical solution, the air pressure balancing device is equipped with two pistons and two connecting rods, which improves the efficiency of the air pressure balancing device in balancing the high and low air pressures formed on the fan blade surface, thereby further improving the noise reduction performance of the axial fan assembly. Connecting one end of each connecting rod to different sides of the crankshaft avoids interference between the two connecting rods during extension and retraction, thus preventing mutual influence.

[0013] Another embodiment of the present invention provides an axial fan assembly in which a crankshaft is disposed at the middle of a housing, with a portion of the crankshaft extending outside the housing and another portion extending inside the housing. The distance between the opening of a first chamber and the opening of a second chamber is equal to the dimension of the fan blades near the end of the fan shroud.

[0014] By employing the above technical solution, the crankshaft is positioned in the middle of the housing, ensuring that the sliding distances of the two pistons are equal. The portion of the crankshaft extending into the housing connects to the connecting rod, while the portion extending outwards connects to the pneumatic pressure balancing motor. The rotation of the pneumatic pressure balancing motor drives the crankshaft to rotate, which in turn causes the connecting rod to slide, thereby causing the piston to slide relative to the housing. During fan blade rotation, high and low air pressures are generated by the edges of the fan blades cutting through the air. The distance between the openings of the first and second chambers is equal to the dimension of the end of the fan blade closest to the fan shroud, which better balances the high and low air pressures generated on the surface of the fan blades during rotation, further improving the noise reduction performance of the pneumatic pressure balancing device.

[0015] Another embodiment of the present invention provides an axial fan assembly, which includes a plurality of pressure balancing devices, and the plurality of pressure balancing devices are evenly arranged at intervals along the outer side wall of the fan shroud.

[0016] By adopting the above technical solution, multiple air pressure balancing devices are evenly arranged at intervals along the outer wall of the fan cover, which can simultaneously balance the high and low air pressure formed on the surfaces of multiple fan blades, thereby greatly improving the noise reduction performance of the axial fan assembly.

[0017] Another embodiment of the present invention provides an axial fan assembly, which further includes a control device and a detection device. The control device is connected to a pressure balancing motor and is used to control the rotation angle of the pressure balancing motor. The detection device is connected to the control device and is used to detect the initial phase of the fan blades.

[0018] Using the above technical solution, before the axial fan assembly starts, the detection device detects the initial phase of the fan blades and transmits the initial phase information to the control device. The control device then controls the air pressure balancing motor to rotate by a certain angle, ensuring that the initial position of the piston in the air pressure balancing device is consistent with the initial phase of the fan blades. This allows the air pressure balancing device to balance the high and low air pressures formed on the fan blade surface simultaneously with the start-up of the axial fan assembly. Furthermore, the control device can control the speed of the air pressure balancing motor, ensuring that the phase of the piston in the air pressure balancing device corresponds to the rotational phase of the fan blades, thereby achieving effective operation of the air pressure balancing device.

[0019] Another embodiment of the present invention provides an axial fan assembly, wherein the detection device is configured as an angle sensor, which is disposed on the fan cover and is used to detect the angle of the fan blades relative to the air pressure balancing device.

[0020] Using the above technical solution, when the axial fan assembly is started, the angle sensor can detect the angle of the fan blades relative to the air pressure balancing device and transmit the angle information to the control device. The control device controls the air pressure balancing motor to rotate, driving the piston to a certain position, so that the high air pressure formed at the opening of the air pressure balancing device housing can correspond to the position of the low air pressure formed on the fan blades, and the low air pressure formed at the opening of the air pressure balancing device housing can correspond to the position of the high air pressure formed on the fan blades.

[0021] The present invention also provides a control method for an axial fan assembly, wherein the axial fan assembly adopts the above-mentioned axial fan assembly, and the control method includes the following steps:

[0022] S1. Obtain the initial phase information of the fan blades of the axial fan assembly, and determine the initial position of the piston of the air pressure balancing device of the axial fan assembly based on the initial phase information.

[0023] S2. Obtain the speed information of the fan motor of the axial fan assembly, and determine the working speed of the air pressure balancing motor of the air pressure balancing device based on the speed information.

[0024] S3 controls the air pressure balance motor to move the piston from its initial position at its operating speed; among which...

[0025] When the air pressure balancing motor drives the piston to move toward the opening of the first chamber of the air pressure balancing device, the air pressure at the position on the fan blade corresponding to the opening of the first chamber increases, and the air pressure at the position corresponding to the opening of the second chamber of the air pressure balancing device decreases.

[0026] When the pressure balancing motor drives the piston to move toward the opening of the second chamber, the air pressure at the position on the fan blade corresponding to the opening of the second chamber increases, and the air pressure at the position corresponding to the opening of the first chamber decreases.

[0027] By adopting the above technical solution, the control method of the axial fan assembly enables the air pressure balancing device to balance the high and low air pressure generated on the fan blade surface when the axial fan assembly starts working. Furthermore, during the operation of the axial fan assembly, the rotation phase of the air pressure balancing motor is always consistent with the rotation phase of the fan motor, so as to ensure that the air pressure balancing device can always balance the high and low air pressure generated on the fan blade surface near it.

[0028] The present invention also provides a control method for an axial fan assembly. In step S1, the air pressure balancing motor drives the piston to move to the initial position according to a preset time-phase model of the air pressure balancing device and the fan blade.

[0029] The present invention also provides a control method for an axial fan assembly, wherein in step S2, the operating speed of the air pressure balance motor is calculated by the following formula:

[0030] n m =kn f ,

[0031] Where, n m For the speed of the air pressure balanced motor, n f denoted as , where is the rotational speed of the fan motor, and k is the number of fan blades.

[0032] Using the above technical solution, the relationship between the speed of the air pressure balance motor and the speed of the fan motor is related to the number of fan blades. Furthermore, the fact that the speed of the air pressure balance motor is directly proportional to the speed of the fan motor ensures that the rotation phase of the air pressure balance motor is always consistent with the rotation phase of the fan motor.

[0033] The beneficial effects of this invention are:

[0034] This invention discloses an axial fan assembly, including a fan shroud, fan blades disposed within the shroud, a fan motor driving the fan blades to rotate, and a pressure balancing device detachably connected to the outer wall of the fan shroud. The pressure balancing device includes a housing, a piston, and a pressure balancing motor. During fan blade rotation, regularly distributed high and low pressure zones form on the fan blade surface. When a high-pressure zone on the fan blade surface moves to the opening of the housing of the pressure balancing device, the piston draws air from the housing, creating a low pressure zone that balances the high pressure on the fan blade surface. Conversely, when a low-pressure zone on the fan blade surface moves to the opening of the housing, the piston compresses the air from the housing, creating a high pressure zone that balances the low pressure on the fan blade surface. This axial fan assembly fundamentally reduces noise generation, thus significantly lowering noise levels. Therefore, this axial fan assembly has the advantage of excellent noise reduction performance. The axial fan assembly also includes a control device and a detection device. Before the axial fan assembly starts, a detection device detects the initial phase of the fan blades and transmits this information to the control device. The control device then controls the air pressure balancing motor to rotate by a certain angle, ensuring that the initial position of the piston in the air pressure balancing device matches the initial phase of the fan blades. This allows the air pressure balancing device to balance the high and low air pressures on the fan blade surface simultaneously with the start-up of the axial fan assembly. Furthermore, the control device can control the speed of the air pressure balancing motor, ensuring that the phase of the piston in the air pressure balancing device corresponds to the rotational phase of the fan blades, thus achieving effective operation of the air pressure balancing device.

[0035] Other features and corresponding beneficial effects of the present invention will be described in the latter part of the specification, and it should be understood that at least some of the beneficial effects will become obvious from the description in the specification. Attached Figure Description

[0036] Figure 1This is a schematic diagram of the axial fan assembly provided in Embodiment 1 of the present invention, showing the fan blades and the air pressure balancing device in one state.

[0037] Figure 2 This is a schematic diagram of the axial fan assembly provided in Embodiment 1 of the present invention;

[0038] Figure 3 This is a schematic diagram of the air pressure balancing device for the axial fan assembly provided in Embodiment 1 of the present invention;

[0039] Figure 4 This is a schematic diagram of the axial fan assembly provided in Embodiment 1 of the present invention with the fan blades and the air pressure balancing device in another state;

[0040] Figure 5 This is a control principle diagram of the axial fan assembly provided in Embodiment 1 of the present invention;

[0041] Figure 6 The time-phase model diagram of the fan blades and air pressure balancing device in the control method of the axial fan assembly provided in Embodiment 2 of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 10: Fan cover;

[0044] 20: Fan blades;

[0045] 30: Fan motor;

[0046] 40: Pressure balancing device;

[0047] 410: Shell; 411: First chamber; 412: Second chamber; 413: Opening;

[0048] 420: Piston;

[0049] 430: Pneumatic balance motor;

[0050] 440: Linkage;

[0051] 450: Crankshaft;

[0052] 50: Detection device; 510: Angle sensor;

[0053] 60: Control device;

[0054] A: The length direction of the shell;

[0055] B: High-pressure zone on the surface of the fan blades;

[0056] C: Low-pressure area on the surface of the fan blade. Detailed Implementation

[0057] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0058] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0059] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0060] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0061] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0062] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0063] Example 1

[0064] This embodiment provides an axial fan assembly, such as Figure 1 and Figure 2As shown, the fan includes a fan cover 10, fan blades 20 disposed within the fan cover 10, a fan motor 30 that drives the fan blades 20 to rotate, and a pressure balancing device 40, which is detachably connected to the outer wall of the fan cover 10. Furthermore, as... Figure 1 As shown, the air pressure balancing device 40 includes a housing 410, a piston 420, and an air pressure balancing motor 430. The housing 410 and the air pressure balancing motor 430 are both fixedly and detachably connected to the outer wall of the fan shroud 10. The piston 420 is slidably disposed inside the housing 410, dividing the inner cavity of the housing 410 into a first chamber 411 and a second chamber 412. The two opposite ends of the first chamber 411 and the second chamber 412 each have an opening 413. The opening 413 of the first chamber 411 and the opening 413 of the second chamber 412 face the fan blade 20 respectively. The air pressure balancing motor 430 is driven by the piston 420 and is used to drive the piston 420 to move along the length A of the housing 410 within the inner cavity of the housing 410.

[0065] When the air pressure balancing motor 430 drives the piston 420 to move toward the opening 413 of the first chamber 411, the air pressure at the position on the fan blade 20 corresponding to the opening 413 of the first chamber 411 increases, and the air pressure at the position corresponding to the opening 413 of the second chamber 412 decreases.

[0066] When the air pressure balancing motor 430 drives the piston 420 to move toward the opening 413 of the second chamber 412, the air pressure at the position on the fan blade 20 corresponding to the opening 413 of the second chamber 412 increases, and the air pressure at the position corresponding to the opening 413 of the first chamber 411 decreases.

[0067] Specifically, the pressure balancing device 40 may include one piston 420 or two pistons 420. Preferably, to make the pressure balancing device 40 more efficient in balancing the high and low air pressures formed on the surface of the fan blade 20, the pressure balancing device 40 in this embodiment includes two pistons 420. Furthermore, the pistons 420 and the inner wall surface of the housing 410 are in close contact.

[0068] More specifically, the pneumatic balance motor 430 and the piston 420 can be connected via a crank-type transmission component or a cam-type transmission component, as long as the rotational motion of the pneumatic balance motor 430 can be converted into the reciprocating linear motion of the piston 420 along the length direction A of the housing 410. The specific connection can be set according to actual design and usage requirements; this embodiment does not impose any specific limitations on this.

[0069] More specifically, the shape of the opening 413 can be square, circular, triangular, etc. Its specific shape can be set according to actual design and usage requirements; this embodiment does not impose any specific limitations on it.

[0070] More specifically, the housing 410 and the pneumatic balance motor 430 can be connected to the fan cover 10 by screwing, snapping, or other detachable fixing methods. The specific connection can be set according to actual design and usage requirements, and this embodiment does not impose any specific limitations on it.

[0071] More specifically, this axial fan assembly is used for cooling automotive engines, air conditioning systems, and the like.

[0072] It should be noted that the air pressure balancing device 40 can balance the high and low air pressures generated on the surface of the fan blade 20 during its rotation. Specifically, during the rotation of the fan blade 20, regularly distributed high and low pressure zones form on its surface. When the high-pressure zone B on the surface of the fan blade 20 moves to the opening 413 of the housing 410 of the air pressure balancing device 40, the piston 420 draws air from inside the housing 410, creating a low pressure zone that balances the high pressure on the surface of the fan blade 20. Conversely, when the low-pressure zone C on the surface of the fan blade 20 moves to the opening 413 of the housing 410 of the air pressure balancing device 40, the piston 420 compresses the air inside the housing 410, creating a high pressure zone that balances the low pressure on the surface of the fan blade 20. This axial fan assembly can fundamentally reduce noise generation, thereby significantly reducing noise levels. Therefore, this axial fan assembly has the advantage of excellent noise reduction performance.

[0073] Furthermore, such as Figure 2 As shown, the axial fan assembly includes multiple pressure balancing devices 40, and the multiple pressure balancing devices 40 are evenly arranged at intervals along the outer side wall of the fan shroud 10.

[0074] Specifically, the number of air pressure balancing devices 40 in the axial fan assembly can be set to one, four, six, etc., and can be set according to actual design and usage requirements. This embodiment does not make specific limitations on this.

[0075] It should be noted that the multiple pressure balancing devices 40 are evenly arranged at intervals along the outer side wall of the fan cover 10, which can simultaneously balance the high and low air pressures formed on the surfaces of multiple fan blades 20, thereby significantly improving the noise reduction performance of the axial fan assembly.

[0076] Furthermore, such as Figure 1 As shown, the air pressure balancing device 40 of the axial fan assembly also includes a transmission component, which includes a connecting rod 440 and a crankshaft 450. The air pressure balancing motor 430 is connected to the crankshaft 450 to drive the crankshaft 450 to rotate relative to the housing 410 around a pivot. One end of the connecting rod 440 is rotatably connected to the crankshaft 450, and the other end of the connecting rod 440 is rotatably connected to the piston 420. By rotating the crankshaft 450, the connecting rod 440 is driven to be in an extended or retracted state, so that the piston 420 can move along the length direction A of the housing 410 inside the housing 410.

[0077] Specifically, the pneumatic balancing motor 430 is equipped with a rotating shaft, the outer wall of which meshes with the outer wall of the crankshaft 450. Rotation of the pneumatic balancing motor 430 drives the rotating shaft to rotate, which in turn drives the crankshaft 450 to rotate. A hole is provided on one side of the piston 420 connecting to the connecting rod 440. One end of the connecting rod 440 is connected to the side of the crankshaft 450 near the edge, and the other end is rotatably connected to the piston 420 via a pin that engages with the hole.

[0078] It should be noted that the rotation of the crankshaft 450 drives the connecting rod 440 to be in an extended or retracted state, thereby enabling the piston 420 to squeeze or suck air inside the housing 410 along the length direction A of the housing 410, forming high and low air pressures, which in turn balances the high and low air pressures formed on the surface of the fan blade 20 during its rotation.

[0079] Furthermore, such as Figure 3 As shown, the air pressure balancing device 40 of the axial fan assembly includes two pistons 420 and two connecting rods 440; one end of the two connecting rods 440 is connected to different sides of the crankshaft 450, and the other end is connected to the two pistons 420 respectively. When one connecting rod 440 is in the extended state, the other connecting rod 440 is in the retracted state.

[0080] Specifically, one end of the two connecting rods 440 is connected to different sides of the crankshaft 450, and the two connecting rods 440 are not on the same straight line in the thickness direction of the crankshaft 450.

[0081] It should be noted that the two pistons 420 and two connecting rods 440 on the air pressure balancing device 40 can improve the efficiency of the air pressure balancing device 40 in balancing the high and low air pressures formed on the surface of the fan blades 20, thereby further improving the noise reduction performance of the axial fan assembly. The fact that one end of each connecting rod 440 is connected to a different side of the crankshaft 450 can prevent the two connecting rods 440 from interfering with each other when extending and retracting.

[0082] Furthermore, the crankshaft 450 of the axial fan assembly is located at the middle of the housing 410, with a portion of the crankshaft 450 extending outside the housing 410 and another portion extending inside the housing 410. The distance between the opening 413 of the first chamber 411 and the opening 413 of the second chamber 412 is equal to the dimension of the end of the fan blade 20 near the fan shroud 10.

[0083] It should be noted that the crankshaft 450 is positioned in the middle of the housing 410 to ensure that the sliding distances of the two pistons 420 are the same. The portion of the crankshaft 450 extending into the housing 410 is used to connect the connecting rod 440, and the portion extending out of the housing 410 is used to connect the air pressure balancing motor 430. The rotation of the air pressure balancing motor 430 drives the crankshaft 450 to rotate, which in turn drives the connecting rod 440 to slide, thereby causing the piston 420 to slide relative to the housing 410. During the rotation of the fan blade 20, high and low air pressures are generated by the cutting of air by the edges on both sides of the fan blade 20. The distance between the opening 413 of the first chamber 411 and the opening 413 of the second chamber 412 is equal to the size of the end of the fan blade 20 closest to the fan cover 10, which can better balance the high and low air pressures formed on the surface of the fan blade 20 during rotation, further improving the noise reduction performance of the air pressure balancing device 40.

[0084] Furthermore, the axial fan assembly also includes a control device 60 and a detection device 50, such as... Figure 5 As shown. The control device 60 is connected to the air pressure balancing motor 430 and is used to control the rotation angle of the air pressure balancing motor 430. The detection device 50 is connected to the control device 60 and is used to detect the initial phase of the fan blade 20.

[0085] Specifically, when the axial fan assembly is used for cooling the engine, air conditioning system, etc. of a car, the control device 60 may be the car's electronic control unit (ECU).

[0086] It should be noted that before the axial fan assembly starts, the detection device 50 detects the initial phase of the fan blades 20 and transmits the initial phase information to the control device 60. The control device 60 then controls the air pressure balancing motor 430 to rotate at a certain angle, so that the initial position of the piston 420 in the air pressure balancing device 40 is consistent with the initial phase of the fan blades 20. This allows the air pressure balancing device 40 to balance the high and low air pressures formed on the surface of the fan blades 20 simultaneously with the start-up of the axial fan assembly. Furthermore, the control device 60 can control the rotational speed of the air pressure balancing motor 430, ensuring that the phase of the piston 420 in the air pressure balancing device 40 corresponds to the rotational phase of the fan blades 20, thereby achieving effective operation of the air pressure balancing device 40.

[0087] Furthermore, the detection device 50 of the axial fan assembly is set as an angle sensor 510 (not shown in the figure), which is located on the fan cover 10 and is used to detect the angle of the fan blade 20 relative to the air pressure balancing device 40.

[0088] It should be noted that when the axial fan assembly is started, the angle sensor 510 can detect the angle of the fan blade 20 relative to the air pressure balancing device 40 and transmit the angle information to the control device 60. The control device 60 controls the air pressure balancing motor 430 to rotate, driving the piston 420 to a certain position, so that the high air pressure formed at the opening 413 of the housing 410 of the air pressure balancing device 40 can correspond to the position of the low air pressure formed on the fan blade 20, and the low air pressure formed at the opening 413 of the housing 410 of the air pressure balancing device 40 can correspond to the position of the high air pressure formed on the fan blade 20.

[0089] Example 2

[0090] This embodiment provides a control method for an axial fan assembly. The axial fan assembly used in Embodiment 1 is an axial fan assembly. The control method includes the following steps:

[0091] S1. Obtain the initial phase information of the fan blades 20 of the axial fan assembly, and determine the initial position of the piston 420 of the air pressure balancing device 40 of the axial fan assembly based on the initial phase information.

[0092] S2. Obtain the speed information of the fan motor 30 of the axial fan assembly, and determine the working speed of the air pressure balancing motor 430 of the air pressure balancing device 40 based on the speed information.

[0093] S3, the control air pressure balance motor 430 moves the piston 420 from its initial position at its operating speed; wherein...

[0094] When the air pressure balancing motor 430 drives the piston 420 to move toward the opening 413 of the first chamber 411 of the air pressure balancing device 40, the air pressure at the position on the fan blade 20 corresponding to the opening 413 of the first chamber 411 increases, and the air pressure at the position corresponding to the opening 413 of the second chamber 412 of the air pressure balancing device 40 decreases.

[0095] When the air pressure balancing motor 430 drives the piston 420 to move toward the opening 413 of the second chamber 412, the air pressure at the position on the fan blade 20 corresponding to the opening 413 of the second chamber 412 increases, and the air pressure at the position corresponding to the opening 413 of the first chamber 411 decreases.

[0096] It should be noted that the control method of this axial fan assembly enables the air pressure balancing device 40 to balance the high and low air pressure generated on the surface of the fan blades 20 when the axial fan assembly starts working. Furthermore, during the operation of the axial fan assembly, the rotation phase of the air pressure balancing motor 430 is always consistent with the rotation phase of the fan motor 30, so as to ensure that the air pressure balancing device 40 can always balance the high and low air pressure generated on the surface of the fan blades 20 that rotate to its vicinity.

[0097] Furthermore, such as Figure 6 As shown, in step S1 of the control method for the axial fan assembly, the air pressure balancing motor 430 drives the piston 420 to move to the initial position according to the preset time-phase model of the air pressure balancing device 40 and the fan blade 20.

[0098] Specifically, such as Figure 1 As shown, the phase of fan blade 20 is 0° at this time, which corresponds to the phase of air pressure balancing device 40 being 0°. Figure 4 As shown, the phase of the fan blade 20 is 25.71° at this time, which corresponds to the phase of the air pressure balancing device 40 being 180°.

[0099] Furthermore, in step S2 of the control method for the axial fan assembly, the operating speed of the air pressure balance motor 430 is calculated using the following formula:

[0100] n m =kn f ,

[0101] Where, n m For the speed of the pneumatic balance motor 430, n f denoted as , where is the rotational speed of fan motor 30, and k is the number of fan blades 20.

[0102] It should be noted that the relationship between the speed of the air pressure balancing motor 430 and the speed of the fan motor 30 is related to the number of fan blades 20. Furthermore, the fact that the speed of the air pressure balancing motor 430 and the speed of the fan motor 30 are directly proportional ensures that the rotation phase of the air pressure balancing motor 430 is always consistent with the rotation phase of the fan motor 30.

[0103] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. An axial fan assembly, comprising a fan shroud, fan blades disposed within the fan shroud, and a fan motor for driving the fan blades to rotate; characterized in that, The axial fan assembly also includes a pressure balancing device, which is detachably connected to the outer wall of the fan shroud; and, The air pressure balancing device includes a housing, a piston, and an air pressure balancing motor. Both the housing and the air pressure balancing motor are fixedly and detachably connected to the outer wall of the fan shroud. The piston is slidably disposed within the housing, dividing the inner cavity of the housing into a first chamber and a second chamber. Both the first and second chambers have openings at opposite ends, with the openings of the first and second chambers facing the fan blades. The air pressure balancing motor is drively connected to the piston, driving the piston to move along the length of the housing within its inner cavity. When the air pressure balancing motor drives the piston to move toward the opening of the first chamber, the air pressure at the position on the fan blade corresponding to the opening of the first chamber increases, and the air pressure at the position corresponding to the opening of the second chamber decreases. When the pressure balancing motor drives the piston to move toward the opening of the second chamber, the air pressure at the position on the fan blade corresponding to the opening of the second chamber increases, and the air pressure at the position corresponding to the opening of the first chamber decreases.

2. The axial fan assembly as described in claim 1, characterized in that, The air pressure balancing device further includes a transmission component, which includes a connecting rod and a crankshaft. The air pressure balancing motor is connected to the crankshaft to drive the crankshaft to rotate relative to the housing about a pivot. One end of the connecting rod is rotatably connected to the crankshaft, and the other end of the connecting rod is rotatably connected to the piston. By rotating the crankshaft, the connecting rod is driven to be in an extended or retracted state, so that the piston can move along the length of the housing inside the housing.

3. The axial fan assembly as described in claim 2, characterized in that, The pressure balancing device includes two pistons and two connecting rods; one end of each connecting rod is connected to a different side of the crankshaft, and the other end is connected to the two pistons respectively; when one connecting rod is in the extended state, the other connecting rod is in the retracted state.

4. The axial fan assembly as described in claim 3, characterized in that, The crankshaft is located at the middle position of the housing, with a portion of the crankshaft extending outside the housing and another portion extending inside the housing; The distance between the opening of the first chamber and the opening of the second chamber is equal to the dimension of the end of the fan blade near the fan shroud.

5. The axial fan assembly as described in claim 4, characterized in that, The axial fan assembly includes a plurality of the pressure balancing devices, and the plurality of pressure balancing devices are evenly and spaced apart along the outer side wall of the fan shroud.

6. The axial fan assembly as described in any one of claims 1-5, characterized in that, The axial fan assembly also includes a control device and a detection device; The control device is connected to the air pressure balancing motor and is used to control the rotation angle of the air pressure balancing motor. The detection device is connected to the control device and is used to detect the initial phase of the fan blade.

7. The axial fan assembly as described in claim 6, characterized in that, The detection device is set as an angle sensor, which is installed on the fan cover and is used to detect the angle of the fan blades relative to the air pressure balancing device.

8. A control method for an axial fan assembly, characterized in that, The axial fan assembly is the axial fan assembly as described in any one of claims 1-7, and the control method includes the following steps: S1. Obtain the initial phase information of the fan blades of the axial fan assembly, and determine the initial position of the piston of the air pressure balancing device of the axial fan assembly based on the initial phase information. S2. Obtain the rotational speed information of the fan motor of the axial fan assembly, and determine the operating speed of the air pressure balancing motor of the air pressure balancing device based on the rotational speed information; S3. Control the pneumatic pressure balancing motor to move the piston from the initial position at the operating speed; wherein... When the air pressure balancing motor drives the piston to move toward the opening of the first chamber of the air pressure balancing device, the air pressure at the position on the fan blade corresponding to the opening of the first chamber increases, and the air pressure at the position corresponding to the opening of the second chamber of the air pressure balancing device decreases. When the pressure balancing motor drives the piston to move toward the opening of the second chamber, the air pressure at the position on the fan blade corresponding to the opening of the second chamber increases, and the air pressure at the position corresponding to the opening of the first chamber decreases.

9. The control method for the axial fan assembly as described in claim 8, characterized in that, In step S1, The air pressure balancing motor drives the piston to move to the initial position according to the preset time-phase model of the air pressure balancing device and the fan blade.

10. The control method for the axial fan assembly as described in claim 9, characterized in that, In step S2, the operating speed of the pneumatic balance motor is calculated using the following formula: n m = kn f , Where, n m n is the rotational speed of the pneumatic balance motor. f Let k be the rotational speed of the fan motor, and k be the number of fan blades.

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