Air inlet adjusting structure, fan and range hood

Abstract

The utility model provides an air inlet adjusting structure, a fan and a range hood, and relates to the technical field of range hoods, and the air inlet adjusting structure mainly comprises a guide vane support, a plurality of guide vanes, a transmission part and a driving motor. The multiple guide vanes are movably connected with the guide vane support and can deflect relative to the guide vane support. The transmission part is in transmission connection with all the guide vanes; the driving motor is in driving connection with any guide vane, and the driving motor is used for driving one guide vane to deflect so as to drive the other guide vanes to deflect. According to the embodiment provided by the invention, the multiple guide vanes are linked through the transmission part, the driving motor drives one guide vane to deflect, and one deflected guide vane drives the other guide vanes to deflect synchronously, so that the mounting angles of all the guide vanes are adjusted, and then the air inlet angle is adjusted.

Description

TECHNICAL FIELD

[0001] The utility model relates to range hood technical field, especially an air inlet adjusting structure, a fan and a range hood. BACKGROUND

[0002] When the range hood is running, a negative pressure is formed at the inlet of the centrifugal fan, and the airflow flows into the air inlet ring. Due to the particularity of the volute design, the circumferential negative pressure distribution of the air inlet ring is not the same, causing uneven air inlet speed, which affects the performance of the fan to some extent. To solve this problem, a resistance piece or a pre-swirl guide vane is usually added to the air inlet ring, such as a ring-shaped iron protective net, a honeycomb-shaped iron protective net, a pre-swirl guide vane, etc. The purpose is to make the air inlet pressure of the air inlet ring more uniform or improve the airflow direction, so that the air inlet airflow direction is consistent with the rotation direction of the impeller, to improve the aerodynamic noise.

[0003] However, the fixed-angle pre-swirl guide vane air inlet grille can only improve the performance within a certain back pressure range, and it is difficult to adapt to all working conditions. SUMMARY

[0004] The present application provides an air inlet adjusting structure, a fan and a range hood to solve the technical problem that the fixed-angle pre-swirl guide vane air inlet grille of the prior art can only improve the performance within a certain back pressure range and is difficult to adapt to all working conditions.

[0005] In a first aspect, the embodiments of the present application provide an air inlet adjusting structure applied to a range hood, which comprises a guide vane support, a plurality of guide vanes, a transmission member and a driving motor. The plurality of guide vanes are movably connected with the guide vane support and can be deflected relative to the guide vane support; the transmission member is in transmission connection with all the guide vanes; the driving motor is in driving connection with any one of the guide vanes, and the driving motor is used to drive one of the guide vanes to deflect to drive the remaining guide vanes to deflect.

[0006] As an optional implementation, the plurality of guide vanes are in the shape of a strip, all the guide vanes are distributed along the outer periphery of the guide vane support, the first end of all the guide vanes is movably connected with the guide vane support, and the second end is away from the guide vane support; the transmission member is annular and surrounds the outside of the guide vane support, and the transmission member is arranged through all the guide vanes.

[0007] As an optional implementation, the transmission member comprises two rings arranged in parallel and spaced apart along the axial direction and concentrically.

[0008] As an optional implementation, the air inlet adjusting structure further comprises an air inlet ring surrounding the outside of the guide vane support; the second end of all the guide vanes is movably connected with the air inlet ring.

[0009] As an optional implementation, the guide vane support is in a ring shape, the plurality of guide vanes are uniformly distributed along the circumference of the guide vane support, and all extend along the radial direction of the guide vane support.

[0010] As an optional implementation, the first end of the plurality of guide vanes is arranged through the guide vane support; and the driving motor is fixed to the inner side of the guide vane support and is in driving connection with the first end of any guide vane.

[0011] In a second aspect, the embodiments of the present application provide a fan, which comprises a volute, the air inlet adjusting structure in any of the foregoing embodiments, and a sound pressure detection device; the air inlet adjusting structure is assembled to the air inlet of the volute; and the sound pressure detection device is assembled to the volute and is close to the air inlet of the volute.

[0012] In a third aspect, the embodiments of the present application provide an extractor hood, which mainly comprises the air inlet adjusting structure in any of the foregoing embodiments.

[0013] The present application provides an air inlet adjusting structure, a fan and an extractor hood, and the technical solutions provided by the embodiments of the present application at least have the following beneficial effects:

[0014] The plurality of guide vanes are linked through the transmission member, the driving motor drives one guide vane to deflect, and one deflected guide vane drives the remaining guide vanes to deflect synchronously, so as to adjust the installation angle of all the guide vanes, and then realize the adjustment of the air inlet angle.

[0015] According to the acquired sound pressure data, the guide vanes are continuously deflected, so that the guide vanes are deflected to the installation angle suitable for the current working condition, so as to improve the aerodynamic noise and meet all working conditions.

[0016] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The foregoing and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the drawings, in which:

[0018] Figure 1 FIG. 1 is a structural schematic diagram of an extractor hood provided by an embodiment of the present application;

[0019] Figure 2 FIG. 4 is a position relationship schematic diagram of the guide vanes and the transmission member in the extractor hood provided by an embodiment of the present application, in which the angle between the guide vanes and the transmission member is 90 degrees;

[0020] Figure 3 FIG. 6 is a transverse cross-sectional schematic diagram of the extractor hood provided by an embodiment of the present application; Figure 2

[0021] Figure 4 ​A schematic diagram illustrating the positional relationship between the guide vane and the transmission component in a range hood, where the angle of tangency is 80 degrees, is provided for an embodiment of this application.

[0022] Figure 5 for Figure 4 A schematic diagram of the cross-section;

[0023] Figure 6 A schematic diagram illustrating the positional relationship between the guide vane and the transmission component in a range hood, with a tangent angle of 20 degrees, provided for an embodiment of this application;

[0024] Figure 7 for Figure 6 A schematic diagram of its cross-section.

[0025] Figure labels and corresponding explanations:

[0026] 1: Guide vane support;

[0027] 2: Guide vane;

[0028] 3: Transmission components;

[0029] 4: Drive motor;

[0030] 5: Air intake ring;

[0031] 6: Snail shell;

[0032] 7: Sound pressure detection device. Detailed Implementation

[0033] This application is described in detail below. Examples of embodiments of this application are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. Furthermore, detailed descriptions of known technologies that are unnecessary for the features of this application are omitted. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0034] like Figures 1-7 As shown in the figure, this application provides an air intake adjustment structure for use in a range hood. The air intake adjustment structure mainly includes a guide vane support 1, multiple guide vanes 2, a transmission component 3, and a drive motor 4. The multiple guide vanes 2 are movably connected to the guide vane support 1, and the multiple guide vanes 2 can deflect relative to the guide vane support 1; the transmission component 3 is drively connected to all guide vanes 2; the drive motor 4 is drively connected to any one of the guide vanes 2, and the drive motor 4 is used to drive one guide vane 2 to deflect, thereby causing the remaining guide vanes 2 to deflect.

[0035] The air intake adjustment structure provided in this application embodiment has multiple guide vanes 2 linked together by a transmission component 3. A drive motor 4 drives one guide vane 2 to deflect, and the deflected guide vane 2 drives the remaining guide vanes 2 to deflect synchronously, so as to adjust the installation angle of all guide vanes 2 and thus realize the adjustment of the air intake angle.

[0036] As an optional implementation, the multiple guide vanes 2 are elongated and distributed along the outer periphery of the guide vane support 1. The first end of each guide vane 2 is movably connected to the guide vane support 1, and the second end is away from the guide vane support 1. The transmission member 3 is annular and surrounds the outside of the guide vane support 1, and the transmission member 3 passes through all the guide vanes 2.

[0037] Based on the aforementioned embodiments, in this embodiment, the guide vane 2 has a long, strip-shaped sheet structure. The guide vane support 1 is centrally located, and all guide vanes 2 are distributed around the guide vane support 1, providing sufficient support for the guide vanes 2. The transmission component 3 is annular and surrounds the outside of the guide vane support 1, passing through all guide vanes 2 to form a stable transmission relationship. The guide vane 2 rotates around its own axis, and the airflow flows along the surface of the guide vane 2. The air inlet angle can be adjusted by the installation angle after the guide vane 2 deflects.

[0038] As an alternative implementation, the transmission component 3 includes two rings that are spaced apart and concentrically arranged along the axial direction.

[0039] Based on the aforementioned embodiments, in this embodiment, the transmission component 3 includes two circular ring structures, which are concentrically arranged. Sufficient friction exists between the transmission component 3 and all the guide vanes 2. The deflected guide vanes 2 apply force to the transmission component 3. Because the two circular ring structures are arranged side-by-side and concentrically, they smoothly transmit the force to the remaining guide vanes 2, thereby achieving deflection of all guide vanes 2 in the same direction and angle.

[0040] As an optional implementation, the air intake adjustment structure also includes an air intake ring 5, which surrounds the outside of the guide vane support 1; the second end of all guide vanes 2 is movably connected to the air intake ring 5.

[0041] Based on the aforementioned embodiments, in this embodiment, the air inlet ring 5 is part of the volute 6, that is, the portion surrounding the outside of the air inlet of the volute 6; optionally, the air inlet ring 5 is integrally formed with the side plate of the volute 6. The guide vane support 1 and the guide vane 2 are both located inside the air inlet ring 5. The guide vane 2 is disposed between the guide vane support 1 and the air inlet ring 5, and both the air inlet ring 5 and the guide vane support 1 provide sufficient support for the deflection of the guide vane 2.

[0042] As an optional implementation, the guide vane support 1 is annular, and multiple guide vanes 2 are evenly distributed around the guide vane support 1 and extend radially along the guide vane support 1.

[0043] Using the above scheme, the transmission component 3 is set between the guide vane support 1 and the air inlet ring 5, and the transmission component 3 passes through all the guide vanes 2 in the circumferential direction to form a grid structure.

[0044] As an optional implementation, the first ends of multiple guide vanes 2 are inserted through the guide vane bracket 1; the drive motor 4 is fixed inside the guide vane bracket 1 and is drivenly connected to the first end of any guide vane 2.

[0045] Based on the aforementioned embodiments, in this embodiment, the first end of all guide vanes 2 has a structure that is thinner in the middle and thicker on both sides. The thinner segment of the first end of all guide vanes 2 passes through the guide vane bracket 1, and the thicker structure on both sides is clamped in the guide vane bracket 1, so as to fix the first end of the guide vane 2 to the guide vane bracket 1. The drive motor 4 is fixed inside the guide vane bracket 1 to make effective use of space and make the structure more compact.

[0046] Based on the same inventive concept, this application provides a fan, which mainly includes a volute 6, an air inlet adjustment structure as described in any of the preceding embodiments, and a sound pressure detection device 7; the air inlet adjustment structure is assembled at the air inlet of the volute 6; the sound pressure detection device 7 is assembled on the volute and close to the air inlet of the volute 6.

[0047] Based on the aforementioned embodiments, in this embodiment, the sound pressure detection device 7 is fixed to the volute 6, and the sound pressure detection device 7 and the air intake adjustment structure are at a reasonable distance to ensure the validity of the sound pressure data detected by the sound pressure detection device 7.

[0048] like Figure 1 As shown, based on the same inventive concept, this application provides a range hood, which mainly includes the fan described in any of the foregoing embodiments.

[0049] Based on the foregoing embodiments, in this embodiment, the fan is part of the air box. The range hood also includes a smoke collection hood, within which the air box can be installed. In some embodiments, the air box is located outside the smoke collection hood and connected to it.

[0050] The range hood provided in this application embodiment has multiple guide vanes 2 of the air intake adjustment structure linked together by a transmission component 3. The drive motor 4 drives one guide vane 2 to deflect, and the deflected guide vane 2 drives the remaining guide vanes 2 to deflect synchronously, so as to adjust the installation angle of all guide vanes 2, thereby realizing the adjustment of the air intake angle.

[0051] In some embodiments, the control method of the air intake adjustment structure in the foregoing embodiments mainly includes steps S101-S104:

[0052] Step S101: After power is turned off and on, the first sound pressure data is acquired multiple times at preset time intervals;

[0053] Step S102: Control all guide vanes 2 to deflect from the preset position to the first direction by a first angle;

[0054] Step S103: If any two adjacent first sound pressure data acquisitions meet the preset coarse adjustment rules, then control all guide vanes 2 to continue to deflect at the first angle in the first direction;

[0055] Step S104: If any two adjacent first sound pressure data acquisitions meet the preset reverse adjustment rule, then control all guide vanes 2 to deflect to the second angle in the second direction;

[0056] Step S105: If the first sound pressure data obtained meets the preset first air inlet angle determination rule, then the angle after the last deflection of the guide vane 2 is taken as the appropriate air inlet angle.

[0057] The first sound pressure data in step S101 is acquired by the sound pressure detection device 7, which is the sound pressure data acquired from the first power-on or after power-off and power-back. The first sound pressure data is used to determine the noise level, providing a basis for subsequent adjustment of the deflection angle of the guide vane 2. The number of times the first sound pressure data is acquired is sufficient to determine the appropriate air inlet angle in step S104.

[0058] The preset position in step S102 is the least suitable extreme air intake angle. The noise will decrease after the guide vane 2 is deflected in any direction and at any angle from the preset position. For example, when viewed from the air intake adjustment structure, the position where the angle between the guide vane 2 and the transmission component is 90 degrees is taken as the preset position.

[0059] The adjustment process of the air intake regulating structure typically includes a coarse adjustment stage and a reverse adjustment stage; the reverse adjustment stage is performed after the coarse adjustment stage. The coarse adjustment stage corresponds to step S103, and the reverse adjustment stage corresponds to step S104. The number of coarse adjustment stages and the number of reverse adjustment stages will vary under different operating conditions. The adapted air intake angle in step S105 refers to the air intake angle adapted to the current operating conditions, at which the controllable noise is minimized.

[0060] The preset time interval in step S101 is 30 seconds. In steps S102 and S103, the first direction and the second direction are opposite, and the second angle is smaller than the first angle; optionally, the first direction is clockwise and the second direction is counterclockwise; optionally, the first direction is counterclockwise and the second direction is clockwise; optionally, the first angle is 10 degrees; optionally, the second angle is 5 degrees.

[0061] The fan control method provided in this application continuously deflects the guide vane 2 based on the acquired sound pressure data, so that the guide vane 2 is deflected to an installation angle that is compatible with the current operating conditions, thereby improving aerodynamic noise and meeting all operating conditions.

[0062] In some embodiments, the coarse adjustment rule in step S103 includes: the difference between the first sound pressure data obtained previously and the first sound pressure data obtained later is greater than or equal to a preset first sound pressure difference.

[0063] The coarse adjustment involves large-angle deflection of guide vane 2. If the difference between the previously acquired first sound pressure level (SPL) data and the subsequently acquired first SPL data is greater than or equal to the preset first SPL difference, it indicates that the sound pressure has decreased, meaning the noise has decreased, and that there is still more room for noise reduction. This coarse adjustment allows the noise level to quickly reach the range required for fine adjustment.

[0064] Optionally, the first sound pressure difference is 0.5 dB.

[0065] In some embodiments, the reverse adjustment rule in step S104 includes: the difference between the first sound pressure data acquired later and the first sound pressure data acquired previously is less than a preset first sound pressure difference.

[0066] Fine-tuning involves deflecting guide vane 2 at a small angle. If the difference between the first sound pressure data acquired in the later acquisition and the first sound pressure data acquired in the previous acquisition is less than the preset first sound pressure difference, it indicates that the sound pressure has increased, and guide vane 2 needs to be reversed to reduce noise.

[0067] In some embodiments, the rule for determining the first air inlet angle in the aforementioned step S105 includes: meeting the reverse adjustment rule twice consecutively.

[0068] If the reverse adjustment rule is met twice consecutively, the installation angle of guide vane 2 after the first fine adjustment rule is met will have very low noise and can be used as the appropriate air inlet angle. That is, guide vane 2 does not need to be deflected after the second time the reverse adjustment rule is met.

[0069] In one specific embodiment, after the initial power-on or power-off and power-back, the guide vane 2 is located in the aforementioned preset position. After 30 seconds, the guide vane 2 is controlled to deflect counterclockwise by 10 degrees, that is, the angle of tangency between the guide vane 2 and the transmission component changes from 90 degrees to 80 degrees. Simultaneously, the first sound pressure level data is acquired for the first time. After 30 seconds, the first sound pressure level data is acquired a second time. The difference between the first and second acquired sound pressure level data is equal to 0.5 dB. The guide vane 2 is then controlled to deflect counterclockwise by another 10 degrees, that is, the angle of tangency between the guide vane 2 and the transmission component changes from 80 degrees to 70 degrees. After 30 seconds, the first sound pressure level data is acquired a third time. The difference between the second and third acquired sound pressure level data is equal to 0.5 dB. The guide vane 2 is then controlled to deflect counterclockwise by another 10 degrees, that is, the angle of tangency between the guide vane 2 and the transmission component changes from 70 degrees to 60 degrees. Thirty seconds later, the first sound pressure level (SPL) data was acquired for the fourth time. The difference between the fourth and third SPL data was 0.4 dB. Guide vane 2 was then rotated clockwise by 5 degrees, changing the angle of tangency between guide vane 2 and the transmission component from 60 degrees to 65 degrees. Thirty seconds later, the first SPL data was acquired for the fifth time. The difference between the fifth and fourth SPL data was 0.3 dB. The position where the angle of tangency between guide vane 2 and the transmission component was 65 degrees was taken as the appropriate air inlet angle.

[0070] In some embodiments, the fan control method further includes steps S201-S204:

[0071] Step S201: After power is turned on without interruption, acquire the second sound pressure data multiple times at preset time intervals;

[0072] Step S202: If the acquired second sound pressure data conforms to the preset first pressure boosting rule, then control all guide vanes 2 to deflect to the second angle in the second direction;

[0073] Step S203: If the newly acquired second sound pressure data conforms to the preset first fine-tuning rule, then control all guide vanes 2 to deflect to the second angle in the second direction;

[0074] Step S204: If the newly acquired second sound pressure data conforms to the preset second air inlet angle determination rule, then the angle after the last deflection of the guide vane 2 is taken as the new adapted air inlet angle.

[0075] Step S201 is performed without powering off the unit after the previously determined suitable air inlet angle. Under this condition, the back pressure may differ from the previous condition. Therefore, it is necessary to determine whether the previously determined suitable air inlet angle is suitable for the current condition. The second sound pressure data obtained in step S201 is acquired by the sound pressure detection device 7. This second sound pressure data is used to determine the noise level, providing a basis for subsequent adjustment of the guide vane 2 deflection angle. The number of times the second sound pressure data is acquired is sufficient to determine the new suitable air inlet angle.

[0076] If the second sound pressure data obtained in step S202 meets the preset first pressure increase rule, it means that the noise has increased and the installation angle of the current guide vane 2 needs to be adjusted, that is, the previously determined suitable air inlet angle does not meet the current working conditions.

[0077] If the newly acquired second sound pressure data in step S203 conforms to the preset first fine-tuning rule, it indicates that the deflection direction in step S202 is correct, and the installation angle of guide vane 2 needs to be fine-tuned. The "newly acquired second sound pressure data" in steps S203 and S204 refers to the second sound pressure data acquired after step S202. The new suitable air inlet angle in step S204 refers to the air inlet angle suitable for the current operating conditions, where the controllable noise is minimized.

[0078] In some embodiments, the first pressure increase rule in step S202 includes: the second sound pressure data continuously increases and the increase value is greater than or equal to a preset sound pressure value.

[0079] Optional, the preset sound pressure level is 1 dB.

[0080] In some embodiments, the first fine-tuning rule in step S203 includes: the difference between the previously acquired second sound pressure data and the subsequently acquired second sound pressure data is greater than or equal to a preset second sound pressure difference.

[0081] Optionally, the second sound pressure difference is 0.3 dB.

[0082] In some embodiments, the rule for determining the second air inlet angle in step S204 includes: meeting the first fine-tuning rule twice consecutively.

[0083] If the first fine-tuning rule is met twice consecutively, the installation angle after the guide vane 2 is deflected after the first time the first fine-tuning rule is met will have very low noise and can be used as a new suitable air inlet angle. That is, after the first fine-tuning rule is met for the second time, the guide vane 2 does not need to be deflected.

[0084] Based on the aforementioned specific embodiments, in one specific embodiment, after determining the position where the guide vane 2 is tangent to the transmission component at an angle of 65 degrees as the appropriate air inlet angle, without powering off and starting the machine, after 30 seconds, the second sound pressure data is acquired for the first time; after 30 seconds, the second sound pressure data is acquired for the second time; after 30 seconds, the second sound pressure data is acquired for the third time; the difference between the second sound pressure data acquired in the second time and the second sound pressure data acquired in the first time is equal to 1 dB, and the difference between the second sound pressure data acquired in the third time and the second sound pressure data acquired in the second time is equal to 1.1 dB, and the guide vane 2 is controlled to deflect clockwise by 5 degrees, that is, the angle between the guide vane 2 and the transmission component changes from 65 degrees to 70 degrees. After 30 seconds, the second sound pressure data is acquired for the fourth time. The difference between the second sound pressure data acquired in the third and fourth acquisitions is 0.3 dB. The guide vane 2 is controlled to deflect clockwise by 5 degrees, that is, the angle between the guide vane 2 and the transmission component changes from 70 degrees to 75 degrees. After 30 seconds, the second sound pressure data is acquired for the fifth time. The difference between the second sound pressure data acquired in the fourth and fifth acquisitions is 0.3 dB. The position where the angle between the guide vane 2 and the transmission component is 75 degrees is taken as the new adaptive air intake angle and kept unchanged until the machine is turned off.

[0085] In some embodiments, the fan control method further includes steps S205-S207:

[0086] Step S205: If the newly acquired second sound pressure data conforms to the preset second pressure boosting rule, then control all guide vanes 2 to deflect to the first direction by a first angle;

[0087] Step S206: If the second sound pressure data obtained meets the preset second fine-tuning rule, then control all guide vanes 2 to deflect to the second angle in the first direction;

[0088] Step S207: If the second sound pressure data obtained meets the preset third air inlet angle determination rule, then the angle after the last deflection of the guide vane 2 is taken as the new adapted air inlet angle.

[0089] In step S205, the "newly acquired second sound pressure data" refers to the second sound pressure data acquired after step S202. If the newly acquired second sound pressure data conforms to the preset second boost rule, it indicates that the deflection in the second direction in step S202 is an incorrect deflection direction, and it needs to be deflected in the opposite direction, that is, it needs to be deflected in the first direction to reduce noise; in addition, the deflection angle also needs to be adjusted appropriately, so the first angle can be twice the second angle.

[0090] The second sound pressure data acquired in steps S206 and S207 is the second sound pressure data acquired after step S205. The new adapted air intake angle in step S207 is different from the adapted air intake angle in the aforementioned step S204. If steps S202-S204 are executed, steps S205-S207 will not be executed; similarly, if steps S205-S207 are executed, steps S202-S204 will not be executed. Regardless of the step, the "new adapted air intake angle" refers to the air intake angle adapted to the current operating conditions, at which the controllable noise is minimized.

[0091] In some embodiments, the second boost rule in step S205 includes: the second sound pressure data acquired later is greater than the second sound pressure data acquired previously.

[0092] In some embodiments, the second fine-tuning rule in step S206 includes: the difference between the second sound pressure data acquired in the previous acquisition and the second sound pressure data acquired in the subsequent acquisition is greater than or equal to a preset second sound pressure difference.

[0093] In some embodiments, the rule for determining the third air inlet angle in step S207 includes: meeting the second fine-tuning rule twice consecutively.

[0094] If the second fine-tuning rule is met twice consecutively, the installation angle of the guide vane 2 after the first time the second fine-tuning rule is met will have very low noise and can be used as a new suitable air inlet angle. That is, the guide vane 2 does not need to be deflected after the second time the second fine-tuning rule is met.

[0095] Based on the aforementioned specific embodiments, in another specific embodiment, if the second sound pressure data acquired for the fourth time is greater than the second sound pressure data acquired for the third time, the guide vane 2 is controlled to deflect counterclockwise by 10 degrees, that is, the angle between the guide vane 2 and the transmission component changes from 70 degrees to 60 degrees; after 30 seconds, the second sound pressure data is acquired for the fifth time, and the difference between the second sound pressure data acquired for the third time and the second sound pressure data acquired for the fifth time is 0.3 dB, so the guide vane 2 is controlled to deflect counterclockwise by 5 degrees, that is, the angle between the guide vane 2 and the transmission component changes from 60 degrees to 55 degrees; after 30 seconds, the second sound pressure data is acquired for the sixth time, and the difference between the second sound pressure data acquired for the fifth time and the second sound pressure data acquired for the sixth time is 0.3 dB, so the position where the angle between the guide vane 2 and the transmission component is 55 degrees is taken as the new suitable air inlet angle, and this position is kept unchanged until the machine is turned off.

[0096] In the description of this application, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0097] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0098] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0099] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0100] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0101] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An air intake adjusting structure applied to a range hood, characterized in that, It comprises: a vane support (1); a plurality of vanes (2) all movably connected with the vane support (1) and deflectable relative to the vane support (1); a transmission member (3) drivingly connected with all the vanes (2); a drive motor (4) drivingly connected with any of the vanes (2), the drive motor (4) being used to drive one of the vanes (2) to deflect to drive the rest of the vanes (2) to deflect.

2. The air intake adjusting structure according to claim 1, wherein: the plurality of vanes (2) are in the shape of long strips, all the vanes (2) are distributed along the outer periphery of the vane support (1), the first ends of all the vanes (2) are movably connected with the vane support (1), and the second ends of all the vanes (2) are away from the vane support (1); the transmission member (3) is in the shape of a ring and surrounds the outside of the vane support (1), and the transmission member (3) is provided through all the vanes (2).

3. The air intake adjusting structure according to claim 2, wherein: the transmission member (3) comprises two rings which are axially parallel and spaced apart and concentrically arranged.

4. The air intake adjusting structure according to claim 2, wherein It further comprises: an air intake ring (5) surrounding the outside of the vane support (1); the second ends of all the vanes (2) are movably connected with the air intake ring (5).

5. The air intake adjusting structure according to claim 4, wherein: the vane support (1) is in the shape of a ring, the plurality of vanes (2) are evenly distributed along the circumference of the vane support (1), and all extend along the radial direction of the vane support (1).

6. The air intake adjusting structure according to claim 5, wherein: the first ends of the plurality of vanes (2) are provided through the vane support (1); the drive motor (4) is fixed to the inside of the vane support (1) and drivingly connected with the first end of any of the vanes (2).

7. A fan, characterized by It comprises: a volute (6); the air intake adjusting structure according to any one of claims 1-6 is assembled at the air inlet of the volute (6); a sound pressure detection device (7) is assembled on the volute and close to the air inlet of the volute.

8. A range hood characterized by It comprises: the fan according to claim 7.

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