A method and device for controlling airflow separation, a fan and a storage medium

Abstract

The application relates to the technical field of household appliances, and discloses a control method and device for airflow separation, a fan and a storage medium. The method comprises the following steps: after the fan is started, the current fluid speed at the outlet of an impeller is acquired; according to the current fluid speed and a preset working condition speed, if it is determined that a target guide wall on a check valve exists and airflow separation occurs, then according to a preset initial linear speed, a Magnus component pre-deployed on the target guide wall is controlled to start rotating; when it is detected that the rotating linear speed corresponding to the Magnus component meets a preset linear speed detection condition, it is determined that the airflow separation control at the outlet of the fan impeller is realized. According to the technical scheme, the Magnus component is arranged on the guide wall, and the linear speed detection condition is preset, so that the airflow separation resistance of the boundary layer of the check valve wall of the fan can be improved, the airflow stability of the air outlet valve seat can be improved, the air volume and the pressure difference can be stabilized, and the noise generated by flow turbulence can be effectively inhibited.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a control method, device, fan, and storage medium for airflow separation. Background Technology

[0002] In the fan of a smoke extraction machine, the airflow can easily separate at the air outlet, which in turn affects the fan's smoke extraction effect.

[0003] Currently, existing methods for controlling airflow separation in fans typically involve deploying a rotating column on the fan's volute body and controlling its rotation to utilize the Magnus effect to achieve more stable airflow and pressure while reducing fan noise. However, in existing technologies, deploying the rotating column on the volute body fails to effectively control airflow separation when it occurs at the guide wall of the outlet channel. This results in poor airflow stability at the outlet valve seat and an inability to effectively suppress noise generated by turbulent flow. Summary of the Invention

[0004] This invention provides a control method, device, fan, and storage medium for airflow separation, which can improve the airflow separation resistance of the check valve wall boundary layer of the fan, improve the airflow stability of the outlet valve seat, stabilize the airflow and pressure distribution, and effectively suppress the noise generated by flow turbulence.

[0005] According to one aspect of the present invention, a control method for airflow separation is provided, comprising:

[0006] After the fan starts, obtain the current fluid velocity at the impeller outlet;

[0007] Based on the current fluid velocity and the preset operating velocity, if it is determined that there is a target guide wall on the check valve where airflow separation occurs, then based on the preset initial linear velocity, the Magnus component pre-deployed on the target guide wall is controlled to start rotating.

[0008] When the rotational linear velocity of the Magnus component is detected to meet the preset linear velocity detection conditions, it is determined that airflow separation control at the fan impeller outlet is achieved.

[0009] Optionally, based on the current fluid velocity and the preset operating condition velocity, determine whether there is a target flow guide wall on the check valve that causes airflow separation, including:

[0010] If the current fluid velocity is detected to be greater than the preset operating velocity, it is determined that airflow separation has occurred on the lower guide wall of the check valve, and the lower guide wall is identified as the target guide wall; and

[0011] If the current fluid velocity is detected to be less than the preset operating condition velocity, it is determined that airflow separation has occurred on the upper guide wall of the check valve, and the upper guide wall is identified as the target guide wall.

[0012] Optionally, the rotational linear velocity of the Magnus component is detected to meet preset linear velocity detection conditions, including:

[0013] Obtain the current mainstream speed and calculate the speed difference between the current mainstream speed and the current rotational linear speed corresponding to the Magnus component;

[0014] Determine whether the speed difference is less than or equal to a preset speed difference threshold. If so, determine that the current rotational linear velocity of the Magnus component meets the preset linear velocity detection condition.

[0015] Optionally, after determining whether the speed difference is less than or equal to a preset speed difference threshold, the method further includes:

[0016] If the detected speed difference is greater than the preset speed difference threshold, the current rotational linear velocity of the Magnus component is controlled to increase in stages according to the preset linear velocity adjustment rules, until the speed difference between the current mainstream speed and the current rotational linear velocity of the Magnus component is less than or equal to the preset speed difference threshold.

[0017] Optionally, after determining that airflow separation control at the wind turbine impeller outlet is achieved, the method further includes:

[0018] Determine whether the current fluid velocity at the impeller outlet is equal to the preset operating condition velocity;

[0019] If the current fluid velocity at the impeller outlet is detected to be equal to the preset operating velocity, it is determined that the airflow separation of the target guide wall has been successfully eliminated, and the Magnus component pre-deployed on the target guide wall is controlled to stop rotating.

[0020] Optionally, the Magnus assembly includes a Magnus body and a motor that drives the Magnus body to rotate. The Magnus body is cylindrical and has evenly distributed pits on its outer surface.

[0021] According to another aspect of the present invention, a control device for airflow separation is provided, comprising:

[0022] The fluid velocity acquisition module is used to acquire the current fluid velocity at the impeller outlet after the fan is started.

[0023] The Magnus component control module is used to control the Magnus component pre-deployed on the target guide wall to start rotating according to the preset initial linear velocity if it is determined that there is a target guide wall on the check valve where airflow separation occurs.

[0024] The rotational linear velocity detection module is used to determine the implementation of airflow separation control at the fan impeller outlet when the rotational linear velocity corresponding to the Magnus component meets the preset linear velocity detection conditions.

[0025] According to another aspect of the present invention, a fan is provided, including a Magnus component and a controller, the controller being connected to the Magnus component;

[0026] The controller is used to execute the airflow separation control method of any embodiment of the present invention, and to generate and send control commands to the Magnus component;

[0027] The Magnus component is used to rotate according to control commands to eliminate airflow separation on the guide wall.

[0028] Optionally, the fan also includes a check valve, which is connected to the fan's volute outlet via a valve seat. The check valve has transversely distributed mounting grooves on its guide wall, and the Magnus component is embedded in the mounting groove. The mounting groove has an arc-shaped concave surface that matches the outer surface of the Magnus component.

[0029] According to another aspect of the present invention, a computer-readable storage medium is provided, which stores computer instructions for causing a processor to execute and implement the airflow separation control method of any embodiment of the present invention.

[0030] The technical solution of this invention involves acquiring the current fluid velocity at the impeller outlet after the fan starts; then, based on the current fluid velocity and a preset operating condition velocity, if it is determined that there is a target guide wall on the check valve where airflow separation occurs, the Magnus component pre-deployed on the target guide wall is controlled to start rotating according to a preset initial linear velocity; when the rotational linear velocity corresponding to the Magnus component is detected to meet the preset linear velocity detection condition, it is determined that airflow separation control at the fan impeller outlet has been achieved. By pre-deploying the corresponding Magnus component on the guide wall of the check valve, controlling the corresponding Magnus component to start rotating when airflow separation is detected on the guide wall, and pre-setting the linear velocity detection condition to determine whether the airflow separation control is successful, the anti-airflow separation capability of the check valve wall boundary layer of the fan can be improved, the airflow stability of the outlet valve seat can be improved, the airflow and pressure can be stabilized, and the noise generated by flow turbulence can be effectively suppressed.

[0031] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1A This is a flowchart of a control method for airflow separation according to Embodiment 1 of the present invention;

[0034] Figure 1B This is a schematic diagram of the structure of a Magnus component according to Embodiment 1 of the present invention;

[0035] Figure 1C This is a schematic diagram of the structure of a fan according to Embodiment 1 of the present invention;

[0036] Figure 1D This is a schematic diagram of fluid movement in a fan according to Embodiment 1 of the present invention;

[0037] Figure 1E This is a schematic diagram of fluid movement in another type of fan provided according to Embodiment 1 of the present invention;

[0038] Figure 1F This is a flowchart of another airflow separation control method provided in Embodiment 1 of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of a control device for airflow separation according to Embodiment 2 of the present invention;

[0040] Figure 3A This is a schematic diagram of the structure of a fan that implements the airflow separation control method of the present invention.

[0041] Figure 3B This is a schematic diagram of a check valve provided according to Embodiment 3 of the present invention.

[0042] In the picture:

[0043] 30. Fan;

[0044] 31. Magnus assembly; 311. Magnus body; 312. Motor; 313. Dent; 314. First Magnus assembly; 315. Second Magnus assembly;

[0045] 32. Controller; 33. Volute;

[0046] 34. Check valve; 341. Check valve outlet; 3421. Lower guide wall; 3422. Upper guide wall; 343. Mounting groove;

[0047] 35. Valve seat; 36. Impeller outlet. Detailed Implementation

[0048] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0049] It should be noted that the terms "first," "second," "target," etc., used 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 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 a non-exclusive inclusion; for example, a process, method, system, product, or apparatus 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 apparatus.

[0050] To facilitate understanding of the technical solution of this embodiment, the structure of the fan 30 in this embodiment is first briefly introduced. The fan 30 may include a volute 33 and a check valve 34. An impeller is disposed within the volute 33. The air outlet of the volute 33 can be connected to the check valve 34 via a valve seat 35. Magnus components 31 can be pre-deployed on each guide wall of the check valve 34 (including the upper guide wall 3422 and the lower guide wall 3421). The number and position of the Magnus components 31 on each guide wall can be adaptively set according to scenario requirements. Each Magnus component 31 is connected to the controller 32 of the fan 30. The deployment direction on the guide wall is perpendicular to the direction from the valve seat 35 to the check valve outlet 341, and can start or stop rotation according to the control command of the controller 32.

[0051] Example 1

[0052] This embodiment is applicable to situations where airflow separation at the outlet of the fan 30 is controlled. The airflow separation control method can be executed by an airflow separation control device, which can be implemented in hardware and / or software. Typically, this airflow separation control device can be configured within the fan 30. Figure 1A As shown, the method includes:

[0053] S110. After the fan 30 is started, obtain the current fluid velocity at the impeller outlet 36.

[0054] In this embodiment, a speed sensor can be pre-deployed at the impeller outlet 36 of the fan 30 to monitor the fluid velocity at the impeller outlet 36 in real time. Specifically, after the controller 32 of the fan 30 detects that the fan 30 has been powered on and started, it can detect the current fluid velocity at the impeller outlet 36 through the pre-deployed speed sensor.

[0055] S120. Based on the current fluid velocity and the preset operating condition velocity, if it is determined that there is a target guide wall on the check valve 34 where airflow separation occurs, then based on the preset initial linear velocity, control the Magnus component 31 pre-deployed on the target guide wall to start rotating.

[0056] Among them, the preset operating speed C T The fluid velocity at the impeller outlet 36 of the fan 30 under preset operating conditions can be used as the preset operating condition velocity C. In this embodiment, the fluid velocity at the impeller outlet 36 under specific operating conditions can be detected in advance. T .

[0057] Specifically, after obtaining the current fluid velocity C, it can be compared with the preset operating condition velocity C. T The size of the flow path determines the target flow path where airflow separation occurs within each flow path of the check valve 34. For example, it can be determined based on the current fluid velocity C and the preset operating velocity C. T The target guide wall is determined by the size relationship between the two components and the mapping relationship between the preset size relationship and the guide wall. Then, the preset initial linear velocity C0 can be used as the rotational linear velocity of the Magnus component 31 on the target guide wall when it starts, so as to control the Magnus component 31 to start rotating.

[0058] For each Magnus component 31, a corresponding rotation direction can be preset. Typically, for the second Magnus component 315 on the upper guide wall 3422, its corresponding rotation direction can be set to clockwise; while for the first Magnus component 314 on the lower guide wall 3421, its corresponding rotation direction can be set to counterclockwise.

[0059] It should be noted that when the Magnus component 31 on the target guide wall starts to rotate, the Magnus components 31 on other guide walls stop working, that is, each Magnus component 31 works alternately to achieve airflow separation control at the air outlet.

[0060] The Magnus assembly 31 may include a Magnus body 311 and a motor 312 for driving the Magnus body 311 to rotate. The Magnus body 311 is cylindrical and has evenly distributed recesses 313 on its outer surface. The motor 312 can be connected to a controller 32 and can drive the cylindrical Magnus body 311 to rotate according to the control commands of the controller 32. For example, the structure of the Magnus assembly 31 can be as follows: Figure 1B As shown, the pits 313 are arranged in an array on the outer surface of the Magnus body 311.

[0061] It should be noted that when the Magnus component 31 rotates, its rotating column wall, through fluid-structure interaction, increases the energy of the boundary layer fluid, delaying the vortices generated by airflow separation and thus promoting flow in the middle of the channel. By applying the Magnus effect to the outlet valve seat and setting a rotating column at the valve seat inlet, the rotating body increases the flow energy of the air near the wall, delaying flow separation and stabilizing airflow and pressure. Secondly, by setting uniformly distributed pits 313 on the outer surface of the Magnus body 311, the laminar boundary layer can be transitioned, exchanging energy with the mainstream, further increasing the wall flow energy and enhancing the Magnus rotating body's effect on stabilizing airflow and pressure.

[0062] S130. When the rotational linear velocity of the Magnus component 31 is detected to meet the preset linear velocity detection conditions, it is determined that the airflow separation control at the impeller outlet 36 of the fan 30 is realized.

[0063] The preset linear velocity detection condition can be preset condition information used to determine whether airflow separation control has been successfully achieved. For example, it can be that the rotational linear velocity of the Magnus component 31 reaches a preset linear velocity threshold, or the difference between the rotational linear velocity and the mainstream velocity is within a preset range.

[0064] Specifically, after the Magnus component 31 on the target guide wall begins to rotate at a preset initial linear velocity C0, it is first determined whether the preset initial linear velocity C0 meets the preset linear velocity detection condition. If so, it can be determined that the airflow separation control has been successfully achieved; if not, the rotational linear velocity of the Magnus component 31 can be increased in stages until it is detected that the rotational linear velocity of the Magnus component 31 meets the preset linear velocity detection condition at a certain moment, thus confirming that the airflow separation control has been successfully achieved. After confirming that the preset linear velocity detection condition is met, the Magnus component 31 can be controlled to maintain the current rotational linear velocity and return to the impeller outlet 36 to compare the fluid velocity with the preset operating condition velocity C. T The size is determined until the fan 30 stops working.

[0065] The technical solution of this invention involves acquiring the current fluid velocity at the impeller outlet 36 after the fan 30 is started; then, based on the current fluid velocity and a preset operating condition velocity, if it is determined that there is a target guide wall on the check valve 34 where airflow separation occurs, the Magnus component 31 pre-deployed on the target guide wall is controlled to start rotating according to a preset initial linear velocity; when the rotational linear velocity corresponding to the Magnus component 31 is detected to meet the preset linear velocity detection condition, it is determined that airflow separation control at the impeller outlet 36 of the fan 30 has been achieved; by pre-deploying the corresponding Magnus component 31 on the guide wall of the check valve 34, controlling the corresponding Magnus component 31 to start rotating when airflow separation is detected on the guide wall, and pre-setting the linear velocity detection condition to determine whether the airflow separation control is successful, the anti-airflow separation capability of the boundary layer of the check valve 34 wall of the fan 30 can be improved, the airflow stability of the outlet valve seat can be improved, the airflow and pressure can be stabilized, and the noise generated by the flow turbulence can be effectively suppressed.

[0066] In an optional embodiment of this example, determining the presence of a target flow guide wall on the check valve 34 for airflow separation based on the current fluid velocity and a preset operating condition velocity may include:

[0067] If the current fluid velocity is detected to be greater than the preset operating condition velocity, it is determined that airflow separation has occurred in the lower guide wall 3421 of the check valve 34, and the lower guide wall 3421 is identified as the target guide wall; and

[0068] If the current fluid velocity is detected to be less than the preset operating condition velocity, it is determined that airflow separation has occurred in the upper guide wall 3422 of the check valve 34, and the upper guide wall 3422 is identified as the target guide wall.

[0069] In a specific example, the structure of the wind turbine 30 can be as follows: Figure 1C As shown, the volute 33 is connected to the check valve 34 via the valve seat 35. The check valve 34 has a check valve outlet 341 and two guide walls, namely a lower guide wall 3421 and an upper guide wall 3422. The lower guide wall 3421 is provided with a first Magnus component 314, and the upper guide wall 3422 is provided with a second Magnus component 315.

[0070] In this embodiment, the impeller rotation direction of the fan 30 can be assumed to be counterclockwise. At this time, when the current fluid velocity C is greater than the preset operating condition velocity C T At that time, the fluid movement in the fan 30 can be as follows Figure 1D As shown (relative to) Figure 1C The fan 30 was rotated up and down. The current fluid velocity C is the absolute velocity calculated based on the fluid's entrainment velocity u and relative velocity w. If the current fluid velocity C is greater than the preset operating velocity Cf... TWhen the first Magnus component 314 is located in the lower guide wall 3421, airflow separation occurs, and vortices are generated due to the airflow separation. At this time, the lower guide wall 3421 can be identified as the target guide wall. Furthermore, by controlling the first Magnus component 314 to rotate counterclockwise (relative to...), Figure 1C The rotation direction of the viewing angle can delay the vortex towards the check valve outlet 341, thereby promoting flow in the middle of the flow channel. When the first Magnus component 314 is rotated, the second Magnus component 315 is not operated.

[0071] In another scenario, the current fluid velocity C is less than the preset operating velocity C. T At that time, the fluid movement in the fan 30 can be as follows Figure 1E As shown. Where the current fluid velocity C is less than the preset operating condition velocity C... T When the second Magnus component 315 is located on the upper guide wall 3422, airflow separation occurs, and vortices generated by the airflow separation exist. At this time, the upper guide wall 3422 can be identified as the target guide wall. Similarly, by controlling the second Magnus component 315 to rotate clockwise, the vortices can be delayed towards the check valve outlet 341, thereby promoting the flow in the middle of the flow channel.

[0072] Optionally, it can be determined whether the current fluid velocity C is greater than or less than the preset operating condition velocity C. T First, determine whether the current fluid velocity C is equal to the preset operating condition velocity C. T If the current fluid velocity C is equal to the preset operating condition velocity C T If no airflow separation occurs in the upper guide wall 3422 and the lower guide wall 3421, then the first Magnus component 314 and the second Magnus component 315 can be controlled to not operate. However, if the current fluid velocity C is not equal to the preset operating velocity C... T Then, it can continue to check whether the current fluid velocity C is greater than or less than the preset operating velocity C. T The judgment.

[0073] In another optional implementation of this embodiment, detecting that the rotational linear velocity corresponding to the Magnus component 31 meets a preset linear velocity detection condition may include:

[0074] Obtain the current mainstream speed and calculate the speed difference between the current mainstream speed and the current rotational linear speed corresponding to the Magnus component 31;

[0075] Determine whether the speed difference is less than or equal to the preset speed difference threshold. If so, determine that the current rotational linear velocity of the Magnus component 31 meets the preset linear velocity detection condition.

[0076] In this embodiment, the preset linear velocity detection condition can be set to the speed difference between the mainstream speed and the rotational linear velocity of the Magnus component 31 being less than or equal to a preset speed difference threshold. Correspondingly, after the Magnus component 31 on the control target guide wall starts rotating at a preset initial linear velocity C0, the current mainstream speed can be obtained through a pre-deployed speed sensor. Then, it can be determined whether the speed difference between the current mainstream speed and the current rotational linear velocity satisfies the condition of being less than or equal to the preset speed difference threshold. If so, it can be determined that the preset linear velocity detection condition is met.

[0077] In a specific example, the current mainstream speed is C. v The current rotational linear velocity is C0, and the preset velocity difference threshold is δc. If |C| is detected... v If -C0|≤δc, then it can be determined that the current rotational linear velocity C0 corresponding to the Magnus component 31 meets the preset linear velocity detection condition.

[0078] Optionally, after determining whether the speed difference is less than or equal to a preset speed difference threshold, the following may also be included:

[0079] If the detected speed difference is greater than the preset speed difference threshold, the current rotational linear velocity corresponding to the Magnus component 31 is controlled to increase in stages according to the preset linear velocity adjustment rules, until the speed difference between the current mainstream speed and the current rotational linear velocity corresponding to the Magnus component 31 is less than or equal to the preset speed difference threshold.

[0080] The preset linear velocity adjustment rule can be the adjustment rule for the rotational linear velocity of the Magnus component 31, for example, it can be doubling or increasing by superimposing preset values.

[0081] In another scenario, if the speed difference exceeds a preset speed difference threshold, the current rotational linear velocity is too low and does not meet the preset linear velocity detection condition. In this case, the rotational linear velocity of the Magnus component 31 can be gradually increased according to the preset linear velocity adjustment rules. Each adjustment of the rotational linear velocity constitutes a judgment on whether the preset linear velocity detection condition is met, until the speed difference between the mainstream velocity and the rotational linear velocity at a certain moment is successfully less than or equal to the preset speed difference threshold, thus confirming that the preset linear velocity detection condition is met.

[0082] The advantage of the above configuration is that it enables the Magnus component 31 to have the ability to control the wall velocity in stages, and to increase the boundary layer energy step by step, thereby adapting to different flow rates.

[0083] In another optional embodiment of this example, after determining that airflow separation control is achieved at the impeller outlet 36 of the fan 30, the following may also be included:

[0084] Determine whether the current fluid velocity at impeller outlet 36 is equal to the preset operating condition velocity;

[0085] If the current fluid velocity at the impeller outlet 36 is detected to be equal to the preset operating velocity, it is determined that the airflow separation of the target guide wall has been successfully eliminated, and the Magnus component 31 pre-deployed on the target guide wall is controlled to stop rotating.

[0086] Specifically, after determining that airflow separation control is achieved at the impeller outlet 36 of the fan 30, if it is detected that the user has not turned off the power to the fan 30, the process returns to check whether the fluid velocity at the impeller outlet 36 is equal to the preset operating velocity C. T The judgment is made; if it is determined that the two are equal, it means that there is no airflow separation in the target guide wall at the current moment, and the controller 32 can control the Magnus component 31 on the target guide wall to stop rotating.

[0087] In one specific embodiment of this example, the flow of the airflow separation control method can be as follows: Figure 1F As shown. First, after the fan 30 starts, i = j = 0 is initialized, and the current fluid velocity C at the impeller outlet 36 is obtained by monitoring the velocity sensor; then, C is compared with the preset operating condition velocity C. T If they are equal, it is determined that no airflow separation has occurred in either the lower guide wall 3421 or the upper guide wall 3422. In this case, the first and second Magnus components can be controlled to not operate. However, if C and C are detected... T If they are not equal, then we can further determine whether C is greater than C. T .

[0088] Furthermore, if it is determined that C is greater than C... T This confirms that airflow separation occurs at the lower guide wall 3421. At this point, the first Magnus component 314 can be controlled to operate, while the second Magnus component 315 is controlled to remain inactive, with j = 0. When controlling the first Magnus component 314 to operate, a rotational linear velocity C can be applied. i = (i+1)C0, where C0 is the preset initial linear velocity. At initial startup, i = 0, C... i The initial linear velocity is set to C0; then, the difference between C0 and the mainstream velocity C is determined. v If the difference between C0 and C is within a preset range, and if so, the system can return to obtaining the fluid velocity at impeller outlet 36 and re-evaluate if it is determined that the user has not turned off the power. If it is determined that C0 and C... v If the difference is not within the preset range, i can be incremented by 1 to obtain the updated rotational linear velocity C1, and the relationship between C1 and the corresponding C can be further compared. v If the difference between them is within a preset range, and if it is still not satisfied, the above process can be repeated until C is detected at a certain moment.i With the corresponding C v The difference between them is within the preset range.

[0089] In another case, if it is determined that C is less than C T If this is confirmed, airflow separation can be determined to have occurred at the upper guide wall 3422. At this point, the second Magnus component 315 can be controlled to operate, while the first Magnus component 314 can be controlled to remain inactive, with i = 0. The same control process as that for the first Magnus component 314 can be used when controlling the second Magnus component 315. Finally, when the user's power is detected to be off, the fan 30 stops operating, and the above process ends.

[0090] In this embodiment, by using the alternating Magnus components 31 to precisely guide the flow of fluid on the wall, the flow energy on the wall can be increased, separation can be eliminated, and flow efficiency can be improved.

[0091] Example 2

[0092] like Figure 2 As shown, the airflow separation control device includes: a fluid velocity acquisition module 210, a Magnus component control module 220, and a rotational linear velocity detection module 230; wherein,

[0093] The fluid velocity acquisition module 210 is used to acquire the current fluid velocity at the impeller outlet 36 after the fan 30 is started;

[0094] Magnus component control module 220 is used to control the Magnus component 31 pre-deployed on the target guide wall to start rotating according to the preset initial linear velocity if it is determined that there is a target guide wall on the check valve 34 where airflow separation occurs.

[0095] The rotational linear velocity detection module 230 is used to determine the implementation of airflow separation control at the impeller outlet 36 of the fan 30 when the rotational linear velocity corresponding to the Magnus component 31 is detected to meet the preset linear velocity detection conditions.

[0096] The technical solution of this invention involves acquiring the current fluid velocity at the impeller outlet 36 after the fan 30 starts; then, based on the current fluid velocity and a preset operating condition velocity, if it is determined that there is a target guide wall on the check valve 34 where airflow separation occurs, the Magnus component 31 pre-deployed on the target guide wall is controlled to start rotating according to a preset initial linear velocity; when the rotational linear velocity corresponding to the Magnus component 31 is detected to meet the preset linear velocity detection condition, it is determined that airflow separation control at the impeller outlet 36 of the fan 30 has been achieved; by pre-deploying the corresponding Magnus component 31 on the guide wall of the check valve 34, controlling the corresponding Magnus component 31 to start rotating when airflow separation is detected on the guide wall, and pre-setting the linear velocity detection condition to determine whether the airflow separation control is successful, the anti-airflow separation capability of the boundary layer of the check valve 34 wall of the fan 30 can be improved, the airflow stability of the outlet valve seat 35 can be improved, the airflow and pressure can be stabilized, and the noise generated by the flow turbulence can be effectively suppressed.

[0097] Optionally, the Magnus component control module 220 is specifically configured to determine, if the current fluid velocity is detected to be greater than the preset operating condition velocity, that airflow separation has occurred at the lower guide wall 3421 of the check valve 34, and designate the lower guide wall 3421 as the target guide wall; and

[0098] If the current fluid velocity is detected to be less than the preset operating condition velocity, it is determined that airflow separation has occurred in the upper guide wall 3422 of the check valve 34, and the upper guide wall 3422 is identified as the target guide wall.

[0099] Optionally, the rotational linear velocity detection module 230 is specifically used to obtain the current mainstream velocity and calculate the velocity difference between the current mainstream velocity and the current rotational linear velocity corresponding to the Magnus component 31.

[0100] Determine whether the speed difference is less than or equal to the preset speed difference threshold. If so, determine that the current rotational linear velocity of the Magnus component 31 meets the preset linear velocity detection condition.

[0101] Optionally, the rotational linear velocity detection module 230 is specifically used to control the current rotational linear velocity corresponding to the Magnus component 31 to increase in stages according to the preset linear velocity adjustment rules if the detected speed difference is greater than the preset speed difference threshold, until the speed difference between the current mainstream speed and the current rotational linear velocity corresponding to the Magnus component 31 is less than or equal to the preset speed difference threshold.

[0102] Optional, the airflow separation control device also includes:

[0103] The fluid velocity determination module is used to determine whether the current fluid velocity at the impeller outlet 36 is equal to the preset operating condition velocity;

[0104] The stop rotation control module is used to determine that the airflow separation of the target guide wall has been successfully eliminated if the current fluid velocity at the impeller outlet 36 is equal to the preset operating velocity, and to control the Magnus component 31 pre-deployed on the target guide wall to stop rotating.

[0105] Optionally, the Magnus assembly 31 includes a Magnus body 311 and a motor 312 for driving the Magnus body 311 to rotate. The Magnus body 311 is cylindrical and has evenly distributed pits 313 on its outer surface.

[0106] The airflow separation control device provided in the embodiments of the present invention can execute the airflow separation control method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0107] Example 3

[0108] like Figure 3A As shown, the fan 30 may include a Magnus component 31 and a controller 32, with the controller 32 connected to the Magnus component 31. The controller 32 is used to execute the airflow separation control method provided in Embodiment 1 of the present invention, generating and sending control commands to the Magnus component 31.

[0109] Magnus components 31 are used to rotate according to control commands to eliminate airflow separation on the guide wall they are on. Magnus components 31 can be deployed on the upper guide wall 3422 and lower guide wall 3421 at the outlet of valve seat 35. The number and location of Magnus components 31 on each guide wall can be adaptively set according to scenario requirements. If multiple Magnus components 31 are deployed on the current guide wall, when airflow separation is determined to occur on the current guide wall, the controller 32 can control each Magnus component 31 on the current guide wall to rotate synchronously, or it can control each Magnus component 31 individually, assigning each Magnus component 31 a different rotational linear velocity.

[0110] Optionally, the fan 30 may also include a check valve 34, which is connected to the air outlet of the volute 33 of the fan 30 via a valve seat 35. The guide wall of the check valve 34 is provided with horizontally distributed mounting grooves 343, and the Magnus component 31 is embedded in the mounting groove 343. The mounting groove 343 has an arcuate concave surface that matches the outer surface of the Magnus component 31.

[0111] In a specific example, the structure of check valve 34 can be as follows: Figure 3B As shown, the Magnus component 31 can be connected to the check valve 34 via a mounting groove 343 with an arc-shaped concave surface embedded in the guide wall.

[0112] Optionally, the fan 30 may also include a speed sensor connected to the controller 32 to acquire the fluid velocity at the impeller outlet 36, as well as the mainstream velocity at different times. This embodiment does not impose specific limitations on the number and deployment location of the speed sensors.

[0113] The technical solution of this invention, by pre-deploying a corresponding Magnus component 31 on the guide wall of the check valve 34 of the fan 30, and controlling the corresponding Magnus component 31 to start rotating when airflow separation is detected in the guide wall, can improve the airflow separation resistance of the boundary layer of the check valve 34 of the fan 30, improve the airflow stability of the outlet valve seat, stabilize the airflow and pressure, and effectively suppress the noise generated by the flow turbulence.

[0114] Optionally, the controller 32 may include at least one processor and a memory, such as a read-only memory (ROM) or a random access memory (RAM), communicatively connected to the at least one processor. The memory stores computer programs executable by the at least one processor, which can perform various appropriate actions and processes based on the computer programs stored in the ROM or loaded from memory into the RAM. The RAM may also store various programs and data required for the operation of the fan 30. The processor, ROM, and RAM are interconnected via a bus. An input / output (I / O) interface is also connected to the bus.

[0115] A processor can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processors include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor performs the various methods and processes described above, such as airflow separation control methods.

[0116] The fan 30 in this embodiment can be applied to equipment such as smoke hoods that have ventilation or smoke extraction requirements. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the invention described and / or claimed herein.

[0117] In some embodiments, the airflow separation control method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as a storage unit. In some embodiments, part or all of the computer program may be loaded and / or installed on the fan 30 via ROM and / or a communication unit. When the computer program is loaded into RAM and executed by a processor, one or more steps of the airflow separation control method described above may be performed. Alternatively, in other embodiments, the processor may be configured to perform the airflow separation control method by any other suitable means (e.g., by means of firmware).

[0118] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0119] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0120] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0121] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0122] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0123] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0124] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A control method for airflow separation, characterized in that, include: After the fan starts, obtain the current fluid velocity at the impeller outlet; Based on the current fluid velocity and the preset operating velocity, if it is determined that there is a target guide wall on the check valve where airflow separation occurs, then based on the preset initial linear velocity, the Magnus component pre-deployed on the target guide wall is controlled to start rotating. When the rotational linear velocity of the Magnus component is detected to meet the preset linear velocity detection conditions, it is determined that airflow separation control at the fan impeller outlet is achieved. The fan includes a volute and a check valve. The check valve is connected to the air outlet of the volute of the fan via a valve seat. The impeller is disposed inside the volute.

2. The method according to claim 1, characterized in that, Based on the current fluid velocity and the preset operating condition velocity, it is determined that there is a target flow guide wall on the check valve where airflow separation occurs, including: If the current fluid velocity is detected to be greater than the preset operating condition velocity, it is determined that airflow separation has occurred on the lower guide wall of the check valve, and the lower guide wall is identified as the target guide wall; and If the current fluid velocity is detected to be less than the preset operating condition velocity, it is determined that airflow separation has occurred on the upper guide wall of the check valve, and the upper guide wall is identified as the target guide wall.

3. The method according to claim 1, characterized in that, The detection that the rotational linear velocity corresponding to the Magnus component meets the preset linear velocity detection conditions includes: Obtain the current mainstream speed and calculate the speed difference between the current mainstream speed and the current rotational linear speed corresponding to the Magnus component; Determine whether the speed difference is less than or equal to a preset speed difference threshold. If so, determine that the current rotational linear velocity corresponding to the Magnus component meets the preset linear velocity detection condition.

4. The method according to claim 3, characterized in that, After determining whether the speed difference is less than or equal to a preset speed difference threshold, the method further includes: If the detected speed difference is greater than the preset speed difference threshold, then according to the preset linear velocity adjustment rule, the current rotational linear velocity corresponding to the Magnus component is controlled to increase in stages until the speed difference between the current mainstream velocity and the current rotational linear velocity corresponding to the Magnus component is less than or equal to the preset speed difference threshold.

5. The method according to claim 1, characterized in that, After determining how to achieve airflow separation control at the wind turbine impeller outlet, the following steps are also included: Determine whether the current fluid velocity at the impeller outlet is equal to the preset operating condition velocity; If the current fluid velocity at the impeller outlet is detected to be equal to the preset operating velocity, it is determined that the airflow separation of the target guide wall has been successfully eliminated, and the Magnus component pre-deployed on the target guide wall is controlled to stop rotating.

6. The method according to any one of claims 1-5, characterized in that, The Magnus assembly includes a Magnus body and a motor that drives the Magnus body to rotate. The Magnus body is cylindrical and has evenly distributed pits on its outer surface.

7. A control device for airflow separation, characterized in that, include: The fluid velocity acquisition module is used to acquire the current fluid velocity at the impeller outlet after the fan is started. The Magnus component control module is used to control the Magnus component pre-deployed on the target guide wall to start rotating according to the current fluid velocity and the preset operating condition velocity, if it is determined that there is a target guide wall on the check valve where airflow separation occurs; The rotational linear velocity detection module is used to determine whether airflow separation control at the fan impeller outlet is achieved when the rotational linear velocity corresponding to the Magnus component meets the preset linear velocity detection conditions. The fan includes a volute and a check valve. The check valve is connected to the air outlet of the volute of the fan via a valve seat. The impeller is disposed inside the volute.

8. A fan, characterized in that, It includes a Magnus component and a controller, the controller being connected to the Magnus component; The controller is configured to execute the airflow separation control method according to any one of claims 1-6, and generate and send control commands to the Magnus component; The Magnus component is used to rotate according to the control command to eliminate airflow separation on the guide wall.

9. The fan according to claim 8, characterized in that, The check valve has transversely distributed mounting grooves on its flow guide wall, and the Magnus component is embedded in the mounting grooves. The mounting grooves have arc-shaped concave surfaces that match the outer surface of the Magnus component.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the airflow separation control method according to any one of claims 1-6.

Images