Low noise fan system

Abstract

This invention discloses a low-noise fan system, comprising: a pneumatic module, a drive module, an air intake module, and an air delivery module; the air intake module is located at the input end of the pneumatic module, the air delivery module is located at the output end of the pneumatic module, and the drive module is connected to the pneumatic module; the air intake module, pneumatic module, and air delivery module are sequentially connected; the pneumatic module includes a first impeller, a second impeller, guide vanes, and a volute; the drive module includes a first motor, a second motor, and a rotating shaft; the first impeller, guide vanes, and second impeller are sequentially arranged and housed inside the volute; the rotating shaft sequentially passes through the first impeller, guide vanes, and second impeller, with the second impeller corresponding to and engaging with the guide vanes; the first motor drives and connects to the first impeller; the second motor drives and connects to the second impeller. The low-noise fan system, through the second motor, can drive the second impeller to rotate in the opposite direction to the first impeller, thereby allowing the first and second impellers to cancel each other out rotational noise.

Description

Technical Field

[0001] This invention relates to the field of wind turbine system technology, and in particular to a low-noise wind turbine system. Background Technology

[0002] A fan system is a fluid machinery system that converts mechanical energy into gas kinetic energy to achieve directional gas transport or pressurization. Its core function is to perform work on the gas through a rotating impeller, overcoming pipeline resistance or meeting specific flow / pressure requirements. Specifically, the fan system converts electrical / mechanical energy into gas kinetic energy and static pressure energy via impeller rotation. In this process, the impeller, as the core of energy conversion, drives the gas flow, while the volute or fan casing guides the airflow and converts it into static pressure energy. The guiding components optimize the inflow and outflow angles of the airflow. The power source of the fan system is generally an electric motor or internal combustion engine, which inputs power to the pneumatic components through a gearbox, belt, or direct drive. Currently, fan systems can also be combined with filtration systems, noise reduction systems, control systems, or safety protection systems to achieve customized functions such as filtration, noise reduction, speed regulation, and overload shutdown protection.

[0003] However, during operation, the pneumatic and drive components of existing wind turbine systems are prone to vibration, resulting in noise at different frequencies. This greatly limits the practical application scenarios of wind turbine systems, making it difficult to apply them to usage scenarios with high requirements for quietness. Summary of the Invention

[0004] Therefore, it is necessary to provide a low-noise fan system to address the technical problem of noise generation in existing fan systems.

[0005] A low-noise fan system includes a pneumatic module, a drive module, an air intake module, and an air delivery module. The air intake module is located at the input end of the pneumatic module, and the air delivery module is located at the output end of the pneumatic module. The drive end of the drive module is connected to the pneumatic module, thereby enabling the drive module to drive the pneumatic module to operate. The air intake module, pneumatic module, and air delivery module are connected in sequence. Thus, when the pneumatic module is running, the air intake module introduces airflow into the pneumatic module, and the airflow output by the pneumatic module is delivered to a preset environmental space through the air delivery module, thereby realizing the actual function of the fan system.

[0006] The pneumatic module includes a first impeller, a second impeller, a guide vane, and a volute. Correspondingly, the drive module includes a first motor, a second motor, and a rotating shaft. The first impeller, guide vane, and second impeller are arranged and housed inside the volute in sequence. The rotating shaft passes through the first impeller, guide vane, and second impeller in sequence, thereby enabling the first impeller and second impeller to rotate relative to the volute. The second impeller corresponds to and engages with the guide vane. The first motor drives and connects to the first impeller. The second motor drives and connects to the second impeller.

[0007] In one embodiment, the first impeller described above is provided with 11 blades and the outlet angle is set to 90°.

[0008] In one embodiment, the second impeller described above is provided with 9 blades and the outlet angle is set to 90°.

[0009] In one embodiment, the diameter ratio of the first impeller to the second impeller is 1.1:1.

[0010] In one embodiment, the blades of the first impeller are circumferentially non-uniformly distributed.

[0011] In one embodiment, the angular tolerance between adjacent blades of the first impeller is limited to ±2°.

[0012] In one embodiment, the trailing edge of the blades of the first impeller described above is provided with a comb-tooth structure.

[0013] In one embodiment, the blades of the second impeller are circumferentially non-uniformly distributed.

[0014] In one embodiment, the adjacent blade angle tolerance of the second impeller is limited to ±2°.

[0015] In one embodiment, the trailing edge of the blades of the second impeller described above is provided with a comb-tooth structure.

[0016] In one embodiment, the aforementioned volute includes an outer layer, a middle layer, and an inner layer. The outer layer serves as the main body of the volute and is disposed on the outer surface of the volute; the middle layer is disposed on the inner surface of the outer layer; and the inner layer is disposed on the inner surface of the middle layer.

[0017] In one embodiment, the outer layer is made of 6061 aluminum alloy and has a thickness of 0.8 mm.

[0018] In one embodiment, the aforementioned middle layer is made of viscoelastic high-damping rubber and has a thickness of 2.0 mm.

[0019] In one embodiment, the inner layer is made of ceramicized silicone rubber and has a thickness of 1.2 mm.

[0020] In one embodiment, the air intake module includes an air intake pipe and an air intake cavity, with one end of the air intake pipe connected to the volute and the other end of the air intake pipe connected to the air intake cavity.

[0021] In one embodiment, the corresponding end of the aforementioned air intake pipe is fitted onto the axial side of the second impeller.

[0022] In one embodiment, a rectifier grid is provided inside the air intake cavity. The rectifier grid is disposed in the air intake cavity along the vertical airflow direction and connected to the inner wall of the air intake cavity.

[0023] In one embodiment, the air supply module is configured as an air supply pipe, one end of which is connected to the volute, and the corresponding end of the air supply pipe is configured on the circumferential side of the first impeller.

[0024] The low-noise fan system disclosed in this invention can independently drive the first impeller and the second impeller through the first motor and the second motor respectively. When the first motor drives the first impeller to rotate, the second motor can drive the second impeller to rotate in the opposite direction relative to the first impeller. (1) The first impeller and the second impeller can cancel each other out rotational noise. During this process, the guide vane can guide the airflow output by the second impeller, so that the radial airflow output by the second impeller is thrown out and enters the guide vane, so that the rotational kinetic energy of the second impeller is converted into static pressure and provides axial air intake for the first impeller. Then, it is output radially with the second impeller. In this way, the airflow between the impellers is avoided from interfering with each other and reducing the air outlet efficiency while achieving noise reduction, thus ensuring the centrifugal pressurization effect.

[0025] (2) It can adjust the phase difference between the first impeller and the second impeller in real time to eliminate noise in a specific frequency band, and can reduce mechanical transmission mechanisms such as gearboxes, thereby further avoiding additional noise generated by gear vibration. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a low-noise fan system in one embodiment; Figure 2 for Figure 1 A schematic diagram of the low-noise fan system from another perspective in the embodiment shown; Figure 3 for Figure 2 A schematic cross-sectional view of part AA in the illustrated embodiment; Figure 4 for Figure 3 An enlarged structural diagram of part M in the illustrated embodiment. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this 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 limitations on this invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] Please see Figures 1 to 4 This invention discloses a low-noise fan system 1, which includes a pneumatic module 10, a drive module 20, an air intake module 30, and an air delivery module 40. The air intake module 30 is located at the input end of the pneumatic module 10, and the air delivery module 40 is located at the output end of the pneumatic module 10. The drive end of the drive module 20 is connected to the pneumatic module 10, thereby enabling the drive module 20 to drive the pneumatic module 10 to operate. The air intake module 30, the pneumatic module 10, and the air delivery module 40 are connected in sequence. Thus, when the pneumatic module 10 is running, the air intake module 30 introduces airflow into the pneumatic module 10, and the airflow output by the pneumatic module 10 is delivered to a preset environmental space through the air delivery module 40, thereby realizing the actual function of the fan system. Based on this, specifically, the pneumatic module 10 includes a first impeller 11, a second impeller 12, a guide vane 13, and a volute 14. Correspondingly, the drive module 20 includes a first motor 21, a second motor 22, and a rotating shaft 23. The first impeller 11, the guide vane 13, and the second impeller 12 are arranged sequentially and housed inside the volute 14. The rotating shaft 23 passes through the first impeller 11, the guide vane 13, and the second impeller 12 in sequence, thereby enabling the first impeller 11 and the second impeller 12 to rotate relative to the volute 14. The second impeller 12 corresponds to and cooperates with the guide vane 13. The first motor 21 drives and connects to the first impeller 11. The second motor 22 drives and connects to the second impeller 12. Based on the above configuration, the first motor 21 and the second motor 22 can independently drive the first impeller 11 and the second impeller 12, respectively. When the first motor 21 drives the first impeller 11 to rotate, the second motor 22 can drive the second impeller 12 to rotate in the opposite direction to the first impeller 11, thereby enabling the first impeller 11 and the second impeller 12 to cancel each other out rotational noise. During this process, the guide vane 13 can guide the airflow output by the second impeller 12, so that the radial airflow output by the second impeller 12 is thrown out and enters the guide vane 13, so that the rotational kinetic energy of the second impeller 12 is converted into static pressure and provides axial air intake for the first impeller 11, which is then output radially with the second impeller 12. In this way, while achieving noise reduction, the mutual interference of airflow between the impellers is avoided, which would reduce the air outlet efficiency and ensure the centrifugal pressurization effect.

[0034] Furthermore, in one embodiment, the first impeller 11 has 11 blades and an outlet angle of 90°; conversely, the second impeller 12 has 9 blades and an outlet angle of 90°. In one embodiment, the diameter ratio of the first impeller 11 to the second impeller 12 is 1.1:1, such that the first impeller 11, located at the rear along the airflow direction, is slightly larger than the second impeller 12, located at the front, to compensate for energy loss. Based on the above scheme, the present invention avoids harmonic superposition by respectively limiting the number of blades in the first impeller 11 and the second impeller 12.

[0035] Furthermore, the blades of the first impeller 11 are circumferentially non-uniformly distributed; specifically, the angular tolerance between adjacent blades of the first impeller 11 is limited to ±2°, thereby disrupting the noise cycle, reducing the sound pressure amplitude of the blade fundamental frequency and harmonic frequencies, and further enhancing the noise reduction effect of the fan system.

[0036] Furthermore, the blade trailing edge of the first impeller 11 is provided with a comb tooth structure, so that when the first impeller 11 rotates, the vortex can be broken and detached through the comb tooth structure, thereby further reducing broadband noise.

[0037] Furthermore, the blades of the second impeller 12 are circumferentially non-uniformly distributed; specifically, the angle tolerance between adjacent blades of the second impeller 12 is limited to ±2°, thereby disrupting the noise cycle, reducing the sound pressure amplitude of the blade fundamental frequency and harmonic frequencies, and further enhancing the noise reduction effect of the fan system.

[0038] Furthermore, the blade trailing edge of the second impeller 12 is provided with a comb-tooth structure, so that when the second impeller 12 rotates, the comb-tooth structure can break the vortex and fall off, thereby working with the first impeller 11 to further reduce broadband noise.

[0039] Furthermore, the volute 14 includes an outer layer 141, a middle layer 142, and an inner layer 143. The outer layer 141, as the main body of the volute 14, is disposed on the outer surface of the volute 14 to provide mechanical support and ensure the stable shape and structure of the volute 14. The middle layer 142 is disposed on the inner surface of the outer layer 141, and the inner layer 143 is disposed on the inner surface of the middle layer 142. Based on the above configuration, the middle layer 142 and the inner layer 143 work together to form a multi-layer vibration absorption structure to absorb and reduce noise inside the volute 14. Specifically, in one embodiment, the outer layer 141 is made of 6061 aluminum alloy with a thickness of 0.8 mm; in another embodiment, the middle layer 142 is made of viscoelastic high-damping rubber with a thickness of 2.0 mm to provide noise reduction performance; in yet another embodiment, the inner layer 143 is made of ceramicized silicone rubber with a thickness of 1.2 mm to provide temperature resistance.

[0040] Furthermore, the air intake module 30 includes an air intake pipe 31 and an air intake cavity 32. One end of the air intake pipe 31 is connected to the volute 14; the other end of the air intake pipe 31 is connected to the air intake cavity 32, thereby enabling air to be sequentially delivered to the volute 14 through the air intake cavity 32 and the air intake pipe 31. Specifically, in one embodiment, the corresponding end of the air intake pipe 31 is fitted to the axial side of the second impeller 12 to facilitate air delivery to the second impeller 12.

[0041] Furthermore, a rectifier grid 33 is provided inside the air intake cavity 32. The rectifier grid 33 is arranged in the air intake cavity 32 along the vertical airflow direction and connected to the inner wall of the air intake cavity 32 to rectify the airflow inside the air intake cavity 32 and eliminate swirling flow, thereby reducing the noise on the air intake side of the fan system.

[0042] Furthermore, the air supply module 40 is configured as an air supply pipe, one end of which is connected to the volute 14, and the corresponding end of the air supply pipe is configured on the circumferential side of the first impeller 11 to receive the airflow output by the first impeller 11.

[0043] In summary, the low-noise fan system disclosed in this invention enables the first and second impellers to be driven independently by a first motor and a second motor, respectively. When the first motor drives the first impeller to rotate, the second motor drives the second impeller to rotate in the opposite direction relative to the first impeller. This allows the first and second impellers to cancel each other out rotational noise. During this process, guide vanes guide the airflow output from the second impeller, causing the radial airflow from the second impeller to be thrown out and enter the guide vanes. This converts the rotational kinetic energy of the second impeller into static pressure, providing axial air intake for the first impeller, which then outputs radially with the second impeller. This achieves noise reduction while avoiding mutual interference between the airflows between the impellers, thus preventing a decrease in airflow efficiency and ensuring centrifugal pressurization. Furthermore, the independent driving of the two impellers by the first and second motors allows for real-time adjustment of the phase difference between the first and second impellers to eliminate noise in specific frequency bands. It also reduces the need for mechanical transmission mechanisms such as gearboxes, further avoiding additional noise generated by gear vibration.

[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A low-noise fan system, characterized in that, include: The system comprises a pneumatic module, a drive module, an air intake module, and an air delivery module. The air intake module is located at the input end of the pneumatic module, and the air delivery module is located at the output end of the pneumatic module. The drive end of the drive module is connected to the pneumatic module, enabling the drive module to drive the pneumatic module to operate. The air intake module, pneumatic module, and air delivery module are connected in sequence. Thus, when the pneumatic module is running, the air intake module introduces airflow into the pneumatic module, and the airflow output by the pneumatic module is delivered to the preset environmental space through the air delivery module. The pneumatic module includes a first impeller, a second impeller, a guide vane, and a volute. Correspondingly, the drive module includes a first motor, a second motor, and a rotating shaft. The first impeller, guide vane, and second impeller are arranged and housed inside the volute in sequence. The rotating shaft passes through the first impeller, guide vane, and second impeller in sequence, thereby enabling the first impeller and second impeller to rotate relative to the volute. The second impeller corresponds to and engages with the guide vane. The first motor drives and connects to the first impeller. The second motor drives and connects to the second impeller. The first motor and the second motor are configured to independently drive the first impeller and the second impeller to rotate in opposite directions, and to adjust the phase difference between the first impeller and the second impeller in real time. The guide vane is used to guide the radial airflow output by the second impeller into axial airflow to supply the first impeller, so that the rotational kinetic energy of the second impeller is converted into static pressure; the trailing edge of the blades of the first impeller is provided with a comb tooth structure, and the angle tolerance between adjacent blades of the first impeller is limited to ±2°. The intake module includes an intake pipe and an intake chamber. One end of the intake pipe is connected to the volute, and the other end of the intake pipe is connected to the intake chamber. The corresponding end of the intake pipe is fitted onto the axial side of the second impeller. A rectifier grid is provided inside the intake chamber. The rectifier grid is arranged in the direction perpendicular to the airflow and connected to the inner wall of the intake chamber. It is used to rectify the airflow inside the intake chamber to eliminate swirl.

2. The low-noise fan system according to claim 1, characterized in that, The first impeller has 11 blades and the outlet angle is set to 90°.

3. The low-noise fan system according to claim 2, characterized in that, The second impeller has 9 blades and an outlet angle of 90°.

4. The low-noise fan system according to claim 3, characterized in that, The diameter ratio of the first impeller to the second impeller is 1.1:

1.

5. The low-noise fan system according to claim 4, characterized in that, The blades of the first impeller are distributed circumferentially in a non-uniform manner.

6. The low-noise fan system according to claim 5, characterized in that, The blades of the second impeller are distributed circumferentially in a non-uniform manner.

7. The low-noise fan system according to claim 6, characterized in that, The volute consists of an outer layer, a middle layer, and an inner layer. The outer layer, as the main body of the volute, is located on the outer surface of the volute; the middle layer is located on the inner surface of the outer layer; and the inner layer is located on the inner surface of the middle layer.

8. The low-noise fan system according to claim 7, characterized in that, The outer layer is made of 6061 aluminum alloy and has a thickness of 0.8mm.

9. The low-noise fan system according to claim 8, characterized in that, The middle layer is made of viscoelastic high-damping rubber with a thickness of 2.0 mm.

10. The low-noise fan system according to claim 9, characterized in that, The inner layer is made of ceramicized silicone rubber and has a thickness of 1.2 mm.

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