A noise reduction structure and a noise reduction structure control method

Abstract

The present disclosure relates to a noise reduction structure and a noise reduction structure control method, the noise reduction structure comprising: at least two noise reduction fins; the at least two noise reduction fins are uniformly distributed around the inner wall of the fan cover of a fan, the fan cover is provided with a moving impeller and a first-stage stationary blade, the noise reduction fins are arranged around the outer periphery of the moving impeller, and the at least two noise reduction fins are used to reduce the noise caused by the flow of air in the cavity where the moving impeller and the first-stage stationary blade are located. The noise reduction structure uniformly distributed on the inner wall of the fan cover can reduce the fan blade frequency while ensuring that the air performance is not lost. The noise reduction fins arranged around the outer periphery of the moving impeller make the flow generated by the moving impeller first interfere with the noise reduction fins, the airflow passes through the noise reduction fins, and then interferes with the first-stage stationary blade to eliminate the moving and stationary interference frequency generated between the moving impeller and the first-stage stationary blade, thereby reducing the noise caused by the flow of air in the cavity where the moving impeller and the first-stage stationary blade are located.

Description

Technical Field

[0001] This invention relates to the field of wind turbine noise reduction technology, and in particular to a noise reduction structure and a noise reduction structure control method. Background Technology

[0002] Floor scrubbers and other cleaning equipment with fan systems are gradually becoming everyday cleaning tools. The motor in the fan system, as the main power source, is the primary source of noise. With technological advancements, the requirements for noise reduction in floor scrubbers are becoming increasingly stringent. Among the noise generated by the fan system, aerodynamic noise is the main source. Therefore, how to reduce the noise of the fan system has become an urgent technical problem to be solved in order to meet these increasingly stringent noise reduction requirements. Summary of the Invention

[0003] To address at least one of the aforementioned technical problems, this disclosure proposes a noise reduction structure and a noise reduction structure control method.

[0004] In a first aspect, this disclosure provides a noise reduction structure for reducing noise in a fan, the noise reduction structure comprising: at least two noise reduction fins;

[0005] At least two noise-reducing fins are evenly distributed around the inner wall of the fan shroud. The fan shroud contains a moving impeller and a first-stage stationary blade. The noise-reducing fins surround the outer periphery of the moving impeller. The at least two noise-reducing fins are used to reduce the noise caused by the airflow in the cavity where the moving impeller and the first-stage stationary blade are located.

[0006] In an optional embodiment, the noise reduction structure further includes a servo motor, which is disposed on the outer wall of the shroud, and each noise reduction fin is connected to a corresponding servo motor.

[0007] The servo motor is connected to the bottom edge of the corresponding noise-reducing fin via a connecting shaft, and the servo motor is used to drive the corresponding noise-reducing fin to rotate around the connecting shaft.

[0008] In an optional embodiment, the connecting shaft passes through a connecting hole on the shroud, and a sealing ring is provided on the inner wall of the connecting hole. The outer side of the sealing ring fits against the inner wall of the connecting hole, and the inner side of the sealing ring fits against the connecting shaft.

[0009] In an optional embodiment, the noise reduction structure further includes: a motor bracket and fixing screws;

[0010] The fixing screws are used to fix the motor bracket to the outer wall of the fan cover, and the motor bracket is used to fix the servo motor.

[0011] In an optional embodiment, the bottom edge of the noise-reducing fin is connected to the inner wall of the shroud, and the edge of the noise-reducing fin opposite to the bottom edge is an arc-shaped line with a radius of curvature of 6mm-7mm.

[0012] At least two noise-reducing fins have their inlet ends evenly distributed on the first circumference, and at least two noise-reducing fins have their outlet ends evenly distributed on the second circumference. The outer diameter of the impeller is smaller than the diameter of the first circumference, and the diameter of the first circumference is smaller than the diameter of the second circumference. The angle between the tangent of the centerline of the inlet end of the noise-reducing fin and the tangent of the first circumference at the location of the inlet end of the noise-reducing fin is the inlet mounting angle of the noise-reducing fin. The angle between the tangent of the centerline of the outlet end of the noise-reducing fin and the tangent of the second circumference at the location of the outlet end of the noise-reducing fin is the outlet mounting angle of the noise-reducing fin. The angle between the radius of curvature of the inlet end of the noise-reducing fin and the radius of curvature of the outlet end of the noise-reducing fin is the wrap angle of the noise-reducing fin.

[0013] With the noise-reducing fins in the preset position, the inlet installation angle of the noise-reducing fins is 31°, the outlet installation angle of the noise-reducing fins is 40°~45°, and the wrap angle of the noise-reducing fins is 16°.

[0014] Secondly, this disclosure provides a fan system including the aforementioned noise reduction structure.

[0015] Thirdly, this disclosure provides a cleaning device including the aforementioned fan system.

[0016] Fourthly, this disclosure provides a noise reduction structure control method, applied to a device including the above-mentioned noise reduction structure, the method comprising:

[0017] Obtain the operating current of the fan motor;

[0018] When the motor operating current is not zero, the motor operating current is compared with a preset current threshold to obtain motor status information.

[0019] Based on the motor status information, the target noise reduction fin is controlled to rotate around the rotation axis by a preset angle to reduce the noise caused by the airflow in the cavity where the moving impeller and the first-stage stationary blade are located. The target noise reduction fin is any one of at least two noise reduction fins.

[0020] In an optional embodiment, the preset current threshold includes a first current threshold and a second current threshold, wherein the first current threshold is less than the second current threshold. Based on motor status information, the target noise reduction fin is controlled to rotate around the rotation axis by a target preset angle, including:

[0021] When the motor status information indicates that the motor operating current is less than the first current threshold, the target noise reduction fins are controlled to rotate around the rotation axis toward the moving impeller by a first preset angle.

[0022] When the motor status information indicates that the motor operating current is greater than the second current threshold, the target noise reduction fins are controlled to rotate around the rotation axis away from the moving impeller by a second preset angle.

[0023] When the motor status information indicates that the motor operating current is greater than the first current threshold and less than the second current threshold, the target noise reduction fin is controlled to rotate around the rotation axis in any direction by a third preset angle. The first preset angle, the second preset angle and the third preset angle are all target preset angles. The absolute value of the third preset angle is less than the absolute value of the first preset angle or the second preset angle.

[0024] In an optional embodiment, the method further includes:

[0025] When the motor operating current is zero, at least two noise-reducing fins maintain their current position.

[0026] In an optional embodiment, the motor operating current is obtained via a current sensing sensor;

[0027] The current detection sensor is connected to the main control circuit. The current detection sensor is used to transmit the motor operating current to the main control circuit. The main control circuit is used to compare the motor operating current with a preset current threshold when the motor operating current is not zero, and obtain the motor status information.

[0028] The main control circuit is connected to the servo motor control circuit. The main control circuit is also used to transmit motor status information to the servo motor control circuit. The servo motor control circuit is used to drive the servo motor to rotate based on the motor status information.

[0029] The servo motor is connected to the target noise reduction fin, and the servo motor is used to drive the target noise reduction fin to rotate around the rotation axis.

[0030] In an optional embodiment, the main control circuit includes: a feedback circuit, a judgment circuit, and a signal transmission unit;

[0031] The input terminal of the feedback circuit is connected to the current detection sensor, the output terminal of the feedback circuit is connected to the input terminal of the judgment circuit, the output terminal of the judgment circuit is connected to the input terminal of the signal transmitting unit, and the output terminal of the signal transmitting unit is connected to the servo motor control circuit.

[0032] The feedback circuit is used to receive and detect the motor operating current, and transmit the motor operating current to the judgment circuit when the motor operating current is not zero.

[0033] The judgment circuit is used to compare the motor operating current with a preset current threshold to obtain motor status information, and then transmit the motor status information to the signal transmission unit.

[0034] The signal transmitting unit is used to transmit motor status information to the servo motor control circuit.

[0035] Fifthly, the present invention also provides a noise reduction structure control device, comprising:

[0036] The acquisition module is used to acquire the operating current of the fan motor;

[0037] The comparison module is used to compare the motor operating current with a preset current threshold when the motor operating current is not zero, so as to obtain the motor status information.

[0038] The control module is used to control the target noise reduction fin to rotate around the rotation axis by a preset angle based on the motor status information, so as to reduce the noise caused by the air flow in the cavity where the moving impeller 3 and the first-stage stationary blade 4 are located. The target noise reduction fin is any one of at least two noise reduction fins.

[0039] Sixthly, the present invention also provides an electronic device, comprising:

[0040] processor;

[0041] Memory used to store processor-executable instructions;

[0042] The processor is used to execute instructions to implement the aforementioned noise reduction structure control method.

[0043] In a seventh aspect, the present invention also provides a storage medium that, when instructions in the storage medium are executed by a processor of an electronic device, enables the electronic device to perform the above-described noise reduction structure control method.

[0044] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0045] Implementing this disclosure will have the following beneficial effects:

[0046] A noise reduction structure is provided for reducing noise in a fan. The noise reduction structure includes at least two noise reduction fins. The at least two noise reduction fins are evenly distributed around the inner wall of the fan shroud. The fan shroud contains a moving impeller and a first-stage stationary blade. The noise reduction fins surround the outer periphery of the moving impeller. The at least two noise reduction fins are used to reduce the noise caused by the airflow in the cavity where the moving impeller and the first-stage stationary blade are located.

[0047] This disclosure utilizes a noise reduction structure evenly distributed on the inner wall of the fan shroud to reduce the fan blade frequency without compromising aerodynamic performance. The noise reduction fins, arranged as described above, surround the outer periphery of the moving impeller, causing the flow generated by the moving impeller to first interfere with the noise reduction fins. After passing through the noise reduction fins, the airflow then interferes with the first-stage stationary blades, thereby eliminating the dynamic-static interference frequency between the moving impeller and the first-stage stationary blades and reducing the noise caused by the airflow within the cavity containing the moving impeller and the first-stage stationary blades.

[0048] Other features and aspects of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0049] To more clearly illustrate the technical solutions and advantages in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The accompanying drawings are incorporated in and constitute a part of this specification, illustrating embodiments consistent with this disclosure, and are used together with the description to explain the principles of this disclosure, and do not constitute an improper limitation of this disclosure.

[0050] Figure 1 This is a schematic diagram illustrating the positional relationship between a noise reduction structure and other components in a fan, according to an exemplary embodiment.

[0051] Figure 2 This is a schematic diagram of noise reduction fin parameters according to an exemplary embodiment;

[0052] Figure 3 This is a detailed structural schematic diagram of a noise reduction structure according to an exemplary embodiment;

[0053] Figure 4 This is a schematic diagram of a motor protective cover according to an exemplary embodiment;

[0054] Figure 5 This is a schematic diagram illustrating a noise reduction structure control method according to an exemplary embodiment;

[0055] Figure 6 This is a schematic diagram illustrating the rotation direction of a target noise reduction fin according to an exemplary embodiment;

[0056] Figure 7 This is a circuit control schematic diagram illustrated according to an exemplary embodiment;

[0057] Figure 8 This is a schematic diagram of a control flow according to an exemplary embodiment;

[0058] Figure 9 This is a schematic diagram of a noise reduction structure control device according to an exemplary embodiment;

[0059] Figure 10 This is a block diagram illustrating an electronic device for controlling a noise reduction structure according to an exemplary embodiment;

[0060] The following is supplementary explanation of the attached figures:

[0061] 1-Noise-reducing fins; 2-Wind cover; 3-Moving impeller; 4-First-stage stationary blades; 5-Servo motor; 6-Motor bracket; 7-Fixing screws; 8-Motor protective cover. Detailed Implementation

[0062] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0063] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or server that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0064] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise. The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0065] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0066] Furthermore, to better illustrate this disclosure, numerous specific details are set forth in the following detailed description. Those skilled in the art will understand that this disclosure can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art have not been described in detail in order to highlight the main points of this disclosure.

[0067] Figure 1 This is a schematic diagram illustrating the positional relationship between a noise reduction structure and other components in a fan, according to an exemplary embodiment. The noise reduction structure is used to reduce noise in the fan. Figure 1 Figure a is a cross-sectional view of the fan, Figure b is a schematic diagram of the noise reduction fins 1 and the shroud 2, and Figure c is a schematic diagram of the moving impeller 3 and the first-stage stationary blades 4. Figure 1 As shown, the noise reduction structure includes: at least two noise reduction fins 1; at least two noise reduction fins 1 are evenly distributed around the inner wall of the fan shroud 2, the fan shroud 2 is provided with a moving impeller 3 and a first-stage stationary blade 4, the noise reduction fins 1 surround the outer periphery of the moving impeller 3, and the at least two noise reduction fins 1 are used to reduce the noise caused by the air flowing in the cavity where the moving impeller 3 and the first-stage stationary blade 4 are located.

[0068] In this embodiment, the noise-reducing fins 1 are sheet-like structures, with at least two noise-reducing fins 1 evenly distributed around the inner wall of the fan shroud 2 facing the impeller 3. The impeller 3 and the first-stage stationary blades 4 are both located within the shroud 2, with the first-stage stationary blades 4 located on the outer periphery of the base where the impeller 3 is situated. The noise-reducing fins 1 are positioned opposite to the first-stage stationary blades 4. An impeller front cover is also provided outside the impeller 3, partially covering it. The noise-reducing fins 1 surround the outer periphery of the impeller 3; specifically, the noise-reducing fins 1 surround the outer periphery of the impeller front cover. The aforementioned noise-reducing structure reduces the fan blade frequency without sacrificing aerodynamic performance. Its mechanism is to eliminate the dynamic-static interference frequencies generated between the impeller 3 and the first-stage stationary blades 4. Without a noise reduction structure, the moving impeller 3 and the first-stage stationary blade 4 generate a dynamic-static interference frequency. With a noise reduction structure, the flow generated by the moving impeller 3 first interferes with the noise reduction fin 1. After the airflow passes through the noise reduction fin 1, it then interferes with the first-stage stationary blade 4, reducing the noise caused by the airflow in the cavity where the moving impeller and the first-stage stationary blade are located. Furthermore, by controlling the number of blades in the moving impeller 3, the noise reduction fin 1, and the first-stage stationary blade 4, the fan's order noise can be eliminated.

[0069] In an optional embodiment, such as Figure 2 As shown, the inlet ends of at least two noise-reducing fins 1 are evenly distributed on the first circumference, and the outlet ends of at least two noise-reducing fins 1 are evenly distributed on the second circumference. The outer diameter D1 of the moving impeller 3 is smaller than the diameter D2 of the first circumference, and the diameter D2 of the first circumference is smaller than the diameter D3 of the second circumference.

[0070] In this embodiment, the diameter D2 of the first circumference is approximately 2mm-3mm larger than the outer diameter D1 of the impeller 3. Optionally, the diameter D2 of the first circumference can be set to 33mm, and the diameter D3 of the second circumference can be set to 40mm.

[0071] In an optional embodiment, the bottom edge of the noise-reducing fin 1 is connected to the inner wall of the shroud 2, and the edge of the noise-reducing fin 1 opposite to the bottom edge is an arc-shaped line with a radius of curvature of 6mm-7mm.

[0072] In this embodiment, viewed from the meridional plane of the noise-reducing fin 1, the edge opposite to the bottom edge of the noise-reducing fin 1 is an arc-shaped line with a radius of curvature of 6mm-7mm. Preferably, the radius of curvature of the arc-shaped line can be set to 6.5mm. The ratio of the distance between the center position of the arc-shaped line and the axis of the fan system to the distance between the center position of the arc-shaped line and the plane containing the foremost point of the first-stage stationary blade 4 is 12.7 / 3.4. The ratio of the distance between the top edge of the noise-reducing fin 1 and the plane containing the foremost point of the first-stage stationary blade 4 to the distance between the center position of the arc-shaped line and the plane containing the foremost point of the first-stage stationary blade 4 is 3.8 / 3.4.

[0073] In an optional embodiment, the angle between the tangent of the center line of the inlet end of the noise-reducing fin 1 and the tangent of the first circumference at the location of the inlet end of the noise-reducing fin 1 is the inlet mounting angle of the noise-reducing fin 1; the angle between the tangent of the center line of the outlet end of the noise-reducing fin 1 and the tangent of the second circumference at the location of the outlet end of the noise-reducing fin 1 is the outlet mounting angle of the noise-reducing fin 1; the angle between the radius of curvature of the inlet end of the noise-reducing fin 1 and the radius of curvature of the outlet end of the noise-reducing fin 1 is the wrap angle of the noise-reducing fin 1; when the noise-reducing fin 1 is in a preset position, the inlet mounting angle of the noise-reducing fin 1 is 31°, the outlet mounting angle of the noise-reducing fin 1 is 40°~45°, and the wrap angle of the noise-reducing fin 1 is 16°.

[0074] In this embodiment of the disclosure, such as Figure 2 As shown, the outlet installation angle of the impeller 3 blade is denoted as β1, the inlet installation angle of the noise-reducing fin 1 is denoted as β2, and the inlet installation angle of the noise-reducing fin 1 is denoted as β3. The aforementioned preset positions can be the initial positions of the noise-reducing fin 1, which can be understood as the position where the noise-reducing fin 1 can achieve the best noise reduction effect, i.e., the position where it eliminates the dynamic-static interference frequency generated between the impeller 3 and the first-stage stationary blade 4. It can also be understood as the position of the noise-reducing fin 1 when the fan motor is operating at high efficiency. The inlet installation angle β2 of the noise-reducing fin 1 needs to be 3° to 5° larger than the outlet installation angle β1 of the impeller 3 blade. Specifically, when the noise-reducing fin 1 is in the preset position, the inlet installation angle β2 of the noise-reducing fin 1 can be set to 31°, and the outlet installation angle β3 of the noise-reducing fin 1 can be set to 40° to 45°. The wrap angle of the noise-reducing fin 1... It is 16°.

[0075] In an optional embodiment, such as Figure 3 As shown, the noise reduction structure also includes a servo motor 5, which is installed on the outer wall of the shroud 2. Each noise reduction fin 1 is connected to a corresponding servo motor 5. The servo motor 5 is connected to the bottom edge of the corresponding noise reduction fin 1 through a connecting shaft. The servo motor 5 is used to drive the corresponding noise reduction fin 1 to rotate around the connecting shaft.

[0076] In this embodiment, the servo motor 5 is connected to the bottom edge of the corresponding noise reduction fin 1 via a connecting shaft at the endpoint where the bottom edge of the noise reduction fin 1 connects to the opposite side of the bottom edge, and at the inlet end of the noise reduction fin 1. The servo motor 5 can drive the corresponding noise reduction fin 1 to rotate around the connecting shaft in a clockwise or counterclockwise direction.

[0077] In an optional embodiment, the connecting shaft passes through a connecting hole on the shroud 2, and a sealing ring is provided on the inner wall of the connecting hole. The outer side of the sealing ring fits against the inner wall of the connecting hole, and the inner side of the sealing ring fits against the connecting shaft.

[0078] In this embodiment of the present disclosure, the wind cover 2 is provided with a connecting hole for the connecting shaft to pass through. In order to prevent air leakage in the cavity where the moving impeller 3 and the first-stage stationary blade 4 are located, a sealing ring is provided on the inner wall of the connecting hole near the outside. By the outer side of the sealing ring fitting with the inner wall of the connecting hole and the inner side fitting with the connecting shaft, air leakage can be prevented.

[0079] In an optional embodiment, such as Figure 3 As shown, the noise reduction structure also includes: a motor bracket 6 and a fixing screw 7; the fixing screw 7 is used to fix the motor bracket 6 to the outer wall of the fan cover 2, and the motor bracket 6 is used to fix the servo motor 5.

[0080] In this embodiment, the motor bracket 6 has a screw hole at each end for engaging the fixing screw 7. The motor bracket 6 has a motor mounting hole in the middle for engaging the servo motor 5. By passing the fixing screw 7 through the corresponding screw hole, the motor bracket 6 can be fixed to the outer wall of the fan cover 2. Then, the servo motor 5 can be installed in the motor mounting hole, thus enabling the assembly of the servo motor 5 and the fan cover 2.

[0081] In an optional embodiment, such as Figure 4 As shown, a motor protective cover 8 is also fitted over the fan cover 2 to protect the motor system. The servo motor 5, motor bracket 6, and fixing screws 7 are all located inside the motor protective cover 8.

[0082] In an optional embodiment, this disclosure provides a fan system including the above-described noise reduction structure.

[0083] In an optional embodiment, this disclosure provides a cleaning device including the above-described fan system. Optionally, the cleaning device may be a floor scrubber, etc.

[0084] Figure 5 This is a schematic diagram illustrating a noise reduction structure control method according to an exemplary embodiment. The method is applied to a device including the aforementioned noise reduction structure, which can be a cleaning device, such as a floor scrubber. The method includes the following:

[0085] Step S501: Obtain the operating current of the fan motor.

[0086] In this embodiment of the disclosure, the operating current of the fan motor can be detected by a current detection sensor.

[0087] Step S502: When the motor operating current is not zero, compare the motor operating current with the preset current threshold to obtain the motor status information.

[0088] In this embodiment of the disclosure, the preset current threshold includes a first current threshold and a second current threshold, wherein the first current threshold is less than the second current threshold. Specifically, the first current threshold can be defined as the current I corresponding to the low-flow-rate operating condition of the motor. min The second current threshold can be defined as the current I corresponding to the high flow rate operation of the motor. max .

[0089] The current I corresponding to the low flow rate of the motor min It can be calculated using the following formula (1):

[0090]

[0091] In equation (1), P e U is the rated power of the motor. e I is the rated voltage of the motor. min This refers to the current corresponding to the low-flow operating condition of the motor.

[0092] The current I corresponding to the high flow rate of the motor max It can be calculated using the following formula (2):

[0093]

[0094] In equation (2), P e U is the rated power of the motor. e I is the rated voltage of the motor. max This refers to the current corresponding to the high-flow operating conditions of the motor.

[0095] Step S503: Based on the motor status information, control the target noise reduction fin to rotate around the rotation axis by a target preset angle to reduce the noise caused by the airflow in the cavity where the moving impeller 3 and the first-stage stationary blade 4 are located. The target noise reduction fin is any one of at least two noise reduction fins.

[0096] In this embodiment of the present disclosure, the rotation direction of the target noise-reducing fin is shown in the schematic diagram below. Figure 6 As shown, the center of the first circle containing the inlet ends of at least two noise-reducing fins 1 is denoted as O1, and the inlet end of the target noise-reducing fin is denoted as O2. The angle θ between the polar axis O2X of the polar coordinate system and the line segment O1O2 is 118°. The rotation axis is the connecting axis connecting the target noise-reducing fin and the corresponding servo motor. The rotation angle corresponding to the target noise-reducing fin rotating about the rotation axis towards the moving impeller (i.e., the outlet end of the target noise-reducing fin moving towards the moving impeller) is denoted as θ1, which is a negative value in the above polar coordinates. The rotation angle corresponding to the target noise-reducing fin rotating about the rotation axis away from the moving impeller (i.e., the outlet end of the target noise-reducing fin moving away from the moving impeller) is denoted as θ2, which is a positive value in the above polar coordinates.

[0097] As can be seen from the above, in this embodiment of the present disclosure, by obtaining the motor operating current of the fan and controlling the target noise reduction fins to rotate around the rotation axis by a target preset angle based on different motor operating currents, the position of the noise reduction fins can be adapted to the current motor operating conditions, so that the noise reduction fins can achieve the best noise reduction effect under the current motor operating conditions, and reduce the noise caused by the air flowing in the cavity where the moving impeller and the first-stage stationary blades are located.

[0098] In this embodiment of the disclosure, based on motor status information, controlling the target noise reduction fins to rotate around the rotation axis by a preset angle includes:

[0099] Step S5031: When the motor status information indicates that the motor operating current is less than the first current threshold, control the target noise reduction fins to rotate around the rotation axis towards the moving impeller by a first preset angle.

[0100] In this embodiment of the present disclosure, when the motor status information indicates that the motor operating current is less than a first current threshold, the controller transmits a corresponding wireless signal to drive the servo motor, so that the servo motor drives the target noise reduction fins to rotate around the rotation axis towards the moving impeller by a first preset angle. Optionally, the first preset angle θ1 is -20° to -10°.

[0101] Step S5032: When the motor status information indicates that the motor operating current is greater than the second current threshold, control the target noise reduction fins to rotate around the rotation axis away from the moving impeller by a second preset angle.

[0102] In this embodiment of the present disclosure, when the motor status information indicates that the motor operating current is greater than a second current threshold, the controller transmits a corresponding wireless signal to drive the servo motor, so that the servo motor drives the target noise reduction fins to rotate around the rotation axis away from the impeller by a second preset angle. Optionally, the second preset angle θ2 is taken as 10° to 20°.

[0103] Step S5033: When the motor status information indicates that the motor operating current is greater than the first current threshold and less than the second current threshold, control the target noise reduction fin to rotate in any direction around the rotation axis by a third preset angle. The first preset angle, the second preset angle and the third preset angle are all target preset angles. The absolute value of the third preset angle is less than the absolute value of the first preset angle or the second preset angle.

[0104] In this embodiment of the disclosure, when the motor status information indicates that the motor operating current is greater than a first current threshold and less than a second current threshold, the controller transmits a corresponding wireless signal to drive the servo motor, so that the servo motor drives the target noise-reducing fins to rotate in any direction around the rotation axis by a third preset angle. Optionally, the third preset angle θ3 is -5° to 5°.

[0105] Based on the above, in this embodiment of the present disclosure, the target noise-reducing fins are controlled to rotate around the rotation axis at different angles according to the relationship between the motor operating current and the first current threshold and the second current threshold. This allows the position of the noise-reducing fins to be adapted to the current motor operating conditions, so that the noise-reducing fins can achieve the best noise reduction effect under the current motor operating conditions, and reduce the noise caused by the airflow in the cavity where the moving impeller and the first-stage stationary blades are located.

[0106] In an optional embodiment, the above method further includes:

[0107] When the motor operating current is zero, at least two noise-reducing fins maintain their current position.

[0108] In this embodiment of the disclosure, when the motor operating current is zero, it indicates that the motor is not in operation. At this time, at least two noise reduction fins remain stationary and are maintained in a preset position.

[0109] In an optional embodiment, the above method can be implemented by a control circuit, the circuit control schematic of which is shown below. Figure 7As shown, the motor operating current is obtained through a motor current detection sensor. The current detection sensor is connected to the main control circuit and is used to transmit the motor operating current to the main control circuit. When the motor operating current is not zero, the main control circuit compares the motor operating current with a preset current threshold to obtain motor status information. The main control circuit is also connected to a servo motor control circuit and is used to transmit the motor status information to the servo motor control circuit. The servo motor control circuit drives the servo motor to rotate based on the motor status information. The servo motor is connected to the target noise reduction fin and is used to drive the target noise reduction fin to rotate around the rotation axis.

[0110] The main control circuit includes a feedback circuit, a judgment circuit, and a signal transmission unit. The input of the feedback circuit is connected to a current detection sensor, the output of the feedback circuit is connected to the input of the judgment circuit, the output of the judgment circuit is connected to the input of the signal transmission unit, and the output of the signal transmission unit is connected to the servo motor control circuit. The feedback circuit receives and detects the motor operating current and transmits it to the judgment circuit when the motor operating current is not zero. The judgment circuit compares the motor operating current with a preset current threshold to obtain motor status information and transmits it to the signal transmission unit. The signal transmission unit transmits the motor status information to the servo motor control circuit.

[0111] In this embodiment of the disclosure, the main control circuit further includes an adjustment loop, which consists of potentiometers that are zeroed before use to serve as a reference for the aforementioned sensor.

[0112] As can be seen from the above, the noise reduction structure can be flexibly controlled by the connection and cooperation between different circuits in the control circuit in the embodiments of this disclosure.

[0113] In one specific implementation, the flowchart of the above control method is as follows: Figure 8 As shown, the motor operating current I is obtained through a current detection sensor. When the motor operating current I is 0, control ends; when the motor operating current I is not 0, it is determined whether the motor operating current I is greater than a second current threshold I. max When the motor operating current I is greater than the second current threshold I... max In this case, the controller transmits the corresponding wireless signal to the servo motor control circuit, and the servo motor drives the corresponding noise-reducing fins to rotate by an angle θ2; when the motor operating current I is less than the second current threshold I... max In this case, determine whether the motor operating current I is less than the first current threshold I. min When the motor operating current I is less than the first current threshold I... minIn this case, the controller transmits the corresponding wireless signal to the servo motor control circuit, and the servo motor drives the corresponding noise-reducing fins to rotate by an angle θ1; when the motor operating current I is not less than the first current threshold I... min In this case, the controller transmits the corresponding wireless signal to the servo motor control circuit, and the servo motor drives the corresponding noise reduction fins to rotate by an angle of θ3.

[0114] Figure 9 This is a block diagram illustrating a noise reduction structure control device according to an exemplary embodiment. (Refer to...) Figure 9 The device includes an acquisition module 901, a comparison module 902, and a control module 903, wherein...

[0115] The acquisition module 901 is used to acquire the motor operating current of the fan;

[0116] The comparison module 902 is used to compare the motor operating current with a preset current threshold when the motor operating current is not zero, so as to obtain the motor status information.

[0117] The control module 903 is used to control the target noise reduction fin to rotate around the rotation axis by a target preset angle based on the motor status information, so as to reduce the noise caused by the air flow in the cavity where the moving impeller 3 and the first-stage stationary blade 4 are located. The target noise reduction fin is any one of at least two noise reduction fins.

[0118] In an optional embodiment, the preset current threshold includes a first current threshold and a second current threshold, wherein the first current threshold is less than the second current threshold, and the control module 903 includes:

[0119] The first control submodule is used to control the target noise reduction fins to rotate around the rotation axis toward the moving impeller by a first preset angle when the motor status information indicates that the motor operating current is less than the first current threshold.

[0120] The second control submodule is used to control the target noise reduction fins to rotate around the rotation axis away from the moving impeller by a second preset angle when the motor status information indicates that the motor operating current is greater than the second current threshold.

[0121] The third control submodule is used to control the target noise reduction fin to rotate around the rotation axis in any direction by a third preset angle when the motor status information indicates that the motor operating current is greater than the first current threshold and less than the second current threshold. The first preset angle, the second preset angle and the third preset angle are all target preset angles, and the absolute value of the third preset angle is less than the absolute value of the first preset angle or the second preset angle.

[0122] In the embodiments of this application, the terms "module" or "unit" refer to a computer program or part of a computer program that has a predetermined function and works with other related parts to achieve a predetermined goal, and can be implemented wholly or partially using software, hardware such as processing circuitry or memory, or combinations thereof. Similarly, one or more processors or memories can be used to implement one or more modules or units. Furthermore, each module or unit can be part of an overall module or unit that includes the functionality of that module or unit.

[0123] In an exemplary embodiment, an electronic device is also provided, including: a processor; and a memory for storing processor-executable instructions; wherein the processor is used for the instructions to implement the noise reduction structure control method as described in the embodiments of this disclosure.

[0124] Figure 10 This is a block diagram illustrating an electronic device for controlling a noise reduction structure according to an exemplary embodiment. The electronic device may be a terminal, and its internal structure diagram may be as follows: Figure 10 As shown, the electronic device includes a processor, memory, network interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The network interface is used to communicate with external terminals via a network connection. When the computer program is executed by the processor, it implements a noise reduction structure control method. The display screen can be a liquid crystal display (LCD) or an e-ink display. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the device's casing, or an external keyboard, touchpad, or mouse.

[0125] Those skilled in the art will understand that Figure 10 The structure shown is merely a block diagram of a portion of the structure related to the present disclosure and does not constitute a limitation on the electronic device to which the present disclosure is applied. A specific electronic device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0126] In an exemplary embodiment, a storage medium is also provided, which, when the instructions in the storage medium are executed by the processor of an electronic device, enables the electronic device to perform the noise reduction structure control method in the embodiments of this disclosure.

[0127] In an exemplary embodiment, a computer program product containing instructions is also provided, which, when run on a computer, causes the computer to execute the noise reduction structure control method of the present disclosure embodiments.

[0128] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this disclosure can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAM bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0129] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0130] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A noise reduction structure, characterized in that, The noise reduction structure is used to reduce noise for the fan, and the noise reduction structure includes: at least two noise reduction fins (1); The at least two noise-reducing fins (1) are evenly distributed around the inner wall of the fan shroud (2). The fan shroud (2) is provided with a moving impeller (3) and a first-stage stationary blade (4). An impeller front cover is also provided outside the moving impeller (3), which covers part of the moving impeller (3). The noise-reducing fins (1) surround the outer periphery of the impeller front cover. The at least two noise-reducing fins (1) are used to reduce the noise caused by the airflow in the cavity where the moving impeller (3) and the first-stage stationary blade (4) are located. The bottom edge of the noise-reducing fin (1) is connected to the inner wall of the wind shield (2), and the edge of the noise-reducing fin (1) opposite to the bottom edge is an arc-shaped line; the noise reduction structure is used to eliminate the dynamic and static interference frequency generated between the moving impeller (3) and the first-stage stationary blade (4).

2. The noise reduction structure according to claim 1, characterized in that, The noise reduction structure also includes a servo motor (5), which is disposed on the outer wall of the wind shroud (2), and each noise reduction fin (1) is connected to a servo motor (5). The servo motor (5) is connected to the bottom edge of the corresponding noise reduction fin (1) via a connecting shaft. The servo motor (5) is used to drive the corresponding noise reduction fin (1) to rotate around the connecting shaft.

3. The noise reduction structure according to claim 2, characterized in that: The connecting shaft passes through the connecting hole on the wind cover (2). The inner wall of the connecting hole is provided with a sealing ring. The outer side of the sealing ring is in contact with the inner wall of the connecting hole, and the inner side of the sealing ring is in contact with the connecting shaft.

4. The noise reduction structure according to claim 2, characterized in that, The noise reduction structure also includes: a motor bracket (6) and fixing screws (7); The fixing screw (7) is used to fix the motor bracket (6) on the outer wall of the fan cover (2), and the motor bracket (6) is used to fix the servo motor (5).

5. The noise reduction structure according to claim 1, characterized in that: The radius of curvature corresponding to the arc-shaped line is 6mm. 7mm; The inlet ends of the at least two noise-reducing fins (1) are evenly distributed on the first circumference, and the outlet ends of the at least two noise-reducing fins (1) are evenly distributed on the second circumference. The outer diameter of the impeller (3) is smaller than the diameter of the first circumference, and the diameter of the first circumference is smaller than the diameter of the second circumference. The angle between the tangent of the center line of the inlet end of the noise-reducing fin (1) and the tangent of the first circumference at the location of the inlet end of the noise-reducing fin (1) is the inlet installation angle of the noise-reducing fin (1). The angle between the tangent of the center line of the outlet end of the noise-reducing fin (1) and the tangent of the second circumference at the location of the outlet end of the noise-reducing fin (1) is the outlet installation angle of the noise-reducing fin (1). The angle between the radius of curvature of the inlet end of the noise-reducing fin (1) and the radius of curvature of the outlet end of the noise-reducing fin (1) is the wrap angle of the noise-reducing fin (1). When the noise reduction fin (1) is in a preset position, the inlet installation angle of the noise reduction fin (1) is 31°, the outlet installation angle of the noise reduction fin (1) is 40°~45°, and the wrap angle of the noise reduction fin (1) is 16°.

6. A noise reduction structure control method, characterized in that, Applicable to, including, as claimed in claim 1 The device with the noise reduction structure described in any one of the 5, the method comprising: Obtain the motor operating current of the fan; When the motor operating current is not zero, the motor operating current is compared with a preset current threshold to obtain motor status information. Based on the motor status information, the target noise reduction fin is controlled to rotate around the rotation axis by a target preset angle to reduce the noise caused by the air flowing in the cavity where the moving impeller (3) and the first-stage stationary blade (4) are located. The target noise reduction fin is any one of the at least two noise reduction fins.

7. The method according to claim 6, characterized in that, The preset current threshold includes a first current threshold and a second current threshold, wherein the first current threshold is less than the second current threshold. The step of controlling the target noise-reducing fins to rotate around the rotation axis by a preset angle based on the motor state information includes: When the motor status information indicates that the motor operating current is less than the first current threshold, the target noise reduction fin is controlled to rotate around the rotation axis in a direction closer to the moving impeller by a first preset angle. When the motor status information indicates that the motor operating current is greater than the second current threshold, the target noise reduction fin is controlled to rotate around the rotation axis away from the moving impeller by a second preset angle. When the motor status information indicates that the motor operating current is greater than the first current threshold and less than the second current threshold, the target noise reduction fin is controlled to rotate in any direction around the rotation axis by a third preset angle. The first preset angle, the second preset angle and the third preset angle are all part of the target preset angle, and the absolute value of the third preset angle is less than the absolute value of the first preset angle or the second preset angle.

8. The method according to claim 6, characterized in that, The method further includes: When the motor operating current is zero, the at least two noise-reducing fins maintain their current position.

9. The method according to claim 6, characterized in that: The operating current of the motor is obtained by a current detection sensor; The current detection sensor is connected to the main control circuit. The current detection sensor is used to transmit the motor operating current to the main control circuit. The main control circuit is used to compare the motor operating current with a preset current threshold when the motor operating current is not zero, so as to obtain motor status information. The main control circuit is connected to the servo motor control circuit. The main control circuit is also used to transmit the motor status information to the servo motor control circuit. The servo motor control circuit is used to drive the servo motor to rotate based on the motor status information. The servo motor is connected to the target noise-reducing fin, and the servo motor is used to drive the target noise-reducing fin to rotate around the rotation axis.

10. The method according to claim 9, characterized in that, The main control circuit includes: a feedback circuit, a judgment circuit, and a signal transmission unit; The input terminal of the feedback circuit is connected to the current detection sensor, the output terminal of the feedback circuit is connected to the input terminal of the judgment circuit, the output terminal of the judgment circuit is connected to the input terminal of the signal transmitting unit, and the output terminal of the signal transmitting unit is connected to the servo motor control circuit. The feedback circuit is used to receive and detect the motor operating current, and transmit the motor operating current to the judgment circuit when the motor operating current is not zero. The judgment circuit is used to compare the motor operating current with the preset current threshold to obtain motor status information, and transmit the motor status information to the signal transmitting unit. The signal transmitting unit is used to transmit the motor status information to the servo motor control circuit.

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