Range hood, air inlet adjusting structure, fan and control method of fan

Abstract

The invention provides a range hood, an air inlet adjusting structure, a draught fan and a control method of the draught fan, 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 present invention relates to the technical field of range hoods, and in particular to a range hood, an air inlet adjustment structure, a fan and a control method of the fan. Background Art

[0002] When the range hood is running, negative pressure is formed at the entrance of the centrifugal fan air inlet circle, and air flows into the air inlet circle. Due to the particularity of the volute design, the circumferential negative pressure distribution of the air inlet circle is not the same, resulting in uneven air intake speed, which affects the fan performance to a certain extent. To address this problem, resistance parts or pre-swirl guide vanes are usually added to the air inlet circle, such as annular iron guards, honeycomb iron guards, pre-swirl guide vanes, etc., in order to make the air intake pressure of the air inlet circle more uniform or improve the airflow direction, so that the air intake airflow direction is consistent with the impeller rotation direction, so as to improve the aerodynamic noise.

[0003] However, the fixed-angle pre-swirl guide vane air intake grille can only achieve performance improvement within a certain back pressure range and is difficult to adapt to all operating conditions. Summary of the invention

[0004] In view of the shortcomings of the existing methods, the present application provides a range hood, an air intake adjustment structure, a fan and a control method for the fan, so as to solve the technical problem that the fixed-angle pre-rotation guide vane air intake grille in the prior art can only achieve performance improvement within a certain back pressure range and is difficult to adapt to all working conditions.

[0005] In the first aspect, the embodiment of the present application provides an air intake adjustment structure, which is applied to a range hood, and the air intake adjustment structure includes a guide vane bracket, a plurality of guide vanes, a transmission member, and a drive motor. The plurality of guide vanes are movably connected to the guide vane bracket and can deflect relative to the guide vane bracket; the transmission member is in driving connection with all the guide vanes; the drive motor is in driving connection with any of the guide vanes, and the drive motor is used to drive one of the guide vanes to deflect so as to drive the other guide vanes to deflect.

[0006] As an optional embodiment, the multiple guide vanes are in the shape of long strips, all of the guide vanes are distributed along the periphery of the guide vane bracket, the first ends of all of the guide vanes are movably connected to the guide vane bracket, and the second ends are away from the guide vane bracket; the transmission member is annular and surrounds the outside of the guide vane bracket, and the transmission member is passed through all of the guide vanes.

[0007] As an optional implementation, the transmission member includes two rings that are axially parallel, spaced apart and concentrically arranged.

[0008] As an optional implementation, the air inlet regulating structure further includes an air inlet ring surrounding the outer side of the guide vane bracket; the second ends of all the guide vanes are movably connected to the air inlet ring.

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

[0010] As an optional implementation, the first ends of the plurality of guide vanes are inserted through the guide vane bracket; the drive motor is fixed to the inner side of the guide vane bracket and is drivingly connected to the first end of any one of the guide vanes.

[0011] In the second aspect, an embodiment of the present application provides a fan, which includes a volute, an air inlet regulating structure described in any of the aforementioned embodiments, and a sound pressure detection device; the air inlet regulating structure is mounted on the air inlet of the volute; the sound pressure detection device is mounted on the volute and close to the air inlet of the volute.

[0012] In a third aspect, an embodiment of the present application provides a range hood, which mainly includes the air inlet adjustment structure described in any one of the aforementioned embodiments.

[0013] In the fourth aspect, an embodiment of the present application provides a control method for the fan described in the aforementioned embodiment, which mainly includes: after power is turned off, obtaining first sound pressure data multiple times at preset time intervals; controlling all guide vanes to deflect from a preset position to a first direction by a first angle; if any two adjacent first sound pressure data obtained meet the preset coarse adjustment rule, controlling all guide vanes to continue to deflect to the first direction by a first angle; if any two adjacent first sound pressure data obtained meet the preset reverse adjustment rule, controlling all guide vanes to deflect to the second direction by a second angle; the first direction and the second direction are opposite; the second angle is smaller than the first angle; if the obtained first sound pressure data meets the preset first air inlet angle determination rule, the angle after the last guide vane deflection is used as the adapted air inlet angle.

[0014] As an optional implementation manner, the coarse adjustment rule includes: a difference between the first sound pressure data acquired last time and the first sound pressure data acquired next time is greater than or equal to a preset first sound pressure difference.

[0015] As an optional implementation, the reverse adjustment rule includes: a difference between the first sound pressure data acquired at a later time and the first sound pressure data acquired at a previous time is smaller than a preset first sound pressure difference.

[0016] As an optional implementation, the first air inlet angle determination rule includes: meeting the reverse adjustment rule twice in a row.

[0017] As an optional implementation, the control method of the fan also includes: after the power is turned on without being turned off, obtaining second sound pressure data multiple times at preset time intervals; if the obtained second sound pressure data meets the preset first boost rule, controlling all guide vanes to deflect to the second direction by a second angle; if the newly obtained second sound pressure data meets the preset first fine-tuning rule, controlling all guide vanes to deflect to the second direction by a second angle; if the newly obtained second sound pressure data meets the preset second air inlet angle determination rule, using the angle after the last guide vane deflection as the new adapted air inlet angle.

[0018] As an optional implementation, the control method of the fan also includes: if the newly acquired second sound pressure data meets the preset second boost rule, controlling all guide vanes to deflect to the first direction by a first angle; the first angle is twice the second angle; if the second sound pressure data acquired again meets the preset second fine-tuning rule, controlling all guide vanes to deflect to the first direction by a second angle; if the second sound pressure data acquired again meets the preset third air inlet angle determination rule, using the angle after the last guide vane deflection as the new adapted air inlet angle.

[0019] The present application provides a range hood, an air inlet adjustment structure, a fan, and a control method for the fan. The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0020] Multiple guide vanes are linked through transmission parts. The driving motor drives one guide vane to deflect. The deflected guide vane drives the other guide vanes to deflect synchronously to adjust the installation angle of all guide vanes, thereby achieving the adjustment of the air inlet angle.

[0021] According to the acquired sound pressure data, the guide vanes are continuously deflected to an installation angle suitable for the current operating conditions to improve aerodynamic noise and meet all operating conditions.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 A schematic diagram of the structure of a range hood provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of the positional relationship of a guide vane and a transmission member in a range hood provided in an embodiment of the present application, wherein the angle of tangency between the guide vane and the transmission member is 90 degrees;

[0026] Figure 3 for Figure 2Schematic diagram of the transverse section;

[0027] Figure 4 A schematic diagram of the positional relationship of a guide vane and a transmission member in a range hood provided in an embodiment of the present application, wherein the angle of tangency between the guide vane and the transmission member is 80 degrees;

[0028] Figure 5 for Figure 4 Schematic diagram of the transverse section;

[0029] Figure 6 A schematic diagram of the positional relationship of a guide vane and a transmission member in a range hood provided in an embodiment of the present application, wherein the angle of tangency between the guide vane and the transmission member is 20 degrees;

[0030] Figure 7 for Figure 6 Schematic diagram of the transverse section;

[0031] Figure 8 A schematic flow chart of steps S101-S105 in a method for controlling a fan provided in an embodiment of the present application;

[0032] Fig. 9 A schematic flow chart of steps S201-S204 in a method for controlling a fan provided in an embodiment of the present application;

[0033] Fig.10 A schematic flow chart of steps S205-S207 in a method for controlling a fan provided in an embodiment of the present application.

[0034] Reference numerals and corresponding descriptions:

[0035] 1: Guide vane bracket;

[0036] 2: Guide vane;

[0037] 3: Transmission parts;

[0038] 4: driving motor;

[0039] 5: air inlet circle;

[0040] 6: snail shell;

[0041] 7: Sound pressure detection device. DETAILED DESCRIPTION

[0042] The present application is described in detail below, and examples of embodiments of the present application are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components with the same or similar functions. In addition, if the detailed description of the known technology is unnecessary for the features of the present application shown, it will be omitted. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0043] like Figure 1-7 As shown, the embodiment of the present application provides an air intake adjustment structure, which is applied to a range hood. The air intake adjustment structure mainly includes a guide vane bracket 1, a plurality of guide vanes 2, a transmission member 3 and a drive motor 4. The plurality of guide vanes 2 are movably connected to the guide vane bracket 1, and the plurality of guide vanes 2 can deflect relative to the guide vane bracket 1; the transmission member 3 is in driving connection with all the guide vanes 2; the drive motor 4 is in driving connection with any guide vane 2, and the drive motor 4 is used to drive one guide vane 2 to deflect so as to drive the remaining guide vanes 2 to deflect.

[0044] In the air inlet adjustment structure provided in the embodiment of the present application, multiple guide vanes 2 are linked through a transmission member 3, and a driving motor 4 drives a guide vane 2 to deflect. A deflected guide vane 2 drives the remaining guide vanes 2 to deflect synchronously to adjust the installation angle of all guide vanes 2, thereby realizing the adjustment of the air inlet angle.

[0045] As an optional embodiment, the multiple guide vanes 2 are in the shape of long strips, all the guide vanes 2 are distributed along the outer periphery of the guide vane bracket 1, the first ends of all the guide vanes 2 are movably connected to the guide vane bracket 1, and the second ends are away from the guide vane bracket 1; the transmission member 3 is annular and surrounds the outside of the guide vane bracket 1, and the transmission member 3 is penetrated through all the guide vanes 2.

[0046] Based on the above embodiments, in this embodiment, the main body of the guide vane 2 is a long sheet structure. The guide vane bracket 1 is centrally arranged, and all the guide vanes 2 are distributed around the guide vane bracket 1, and the guide vane bracket 1 provides sufficient support for the guide vanes 2. The transmission member 3 is annular and surrounds the outside of the guide vane bracket 1 and penetrates all the 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 is deflected.

[0047] As an optional embodiment, the transmission member 3 includes two rings that are axially arranged in parallel and concentrically.

[0048] Based on the above embodiments, in this embodiment, the transmission member 3 includes two circular annular structures, which are concentrically arranged. There is sufficient friction between the transmission member 3 and all the guide vanes 2, and the deflected guide vanes 2 exert force on the transmission member 3. Since the two circular annular structures are spaced in parallel and concentrically arranged, the two circular annular structures smoothly transmit the force to the remaining guide vanes 2, thereby achieving the deflection of all the guide vanes 2 with the same deflection direction and angle.

[0049] As an optional implementation, the air inlet regulating structure further includes an air inlet ring 5 , which surrounds the outer side of the guide vane bracket 1 ; the second ends of all the guide vanes 2 are movably connected to the air inlet ring 5 .

[0050] Based on the above embodiments, in this embodiment, the air inlet ring 5 is a part of the volute 6, that is, the part surrounding the outside of the air inlet of the volute 6; optionally, the air inlet ring 5 is formed integrally with the side plate of the volute 6. The guide vane bracket 1 and the guide vane 2 are both located inside the air inlet ring 5. The guide vane 2 is arranged between the guide vane bracket 1 and the air inlet ring 5, and the air inlet ring 5 and the guide vane bracket 1 both provide sufficient support for the deflection of the guide vane 2.

[0051] As an optional implementation, the guide vane support 1 is in a circular ring shape, and the plurality of guide vanes 2 are evenly distributed along the circumference of the guide vane support 1 and extend in the radial direction of the guide vane support 1 .

[0052] With the above solution, the transmission member 3 is arranged between the guide vane support 1 and the air inlet ring 5, and the transmission member 3 is circumferentially passed through all the guide vanes 2 to form a grid structure.

[0053] As an optional implementation, the first ends of the plurality of guide vanes 2 are inserted through the guide vane bracket 1 ; the drive motor 4 is fixed to the inner side of the guide vane bracket 1 and is drivingly connected to the first end of any guide vane 2 .

[0054] Based on the above embodiments, in this embodiment, the first ends of all the guide vanes 2 have a structure that is thin in the middle and thick on both sides, the thin sections of the first ends of all the guide vanes 2 are inserted into the guide vane bracket 1, and the thick structures on both sides are clamped in the guide vane bracket 1, so that the first ends of the guide vanes 2 are fixed to the guide vane bracket 1. The drive motor 4 is fixed inside the guide vane bracket 1 to achieve effective use of space and make the structure more compact.

[0055] Based on the same inventive concept, an embodiment of the present application provides a fan, which mainly includes a volute 6, an air inlet regulating structure as described in any of the aforementioned embodiments, and a sound pressure detection device 7; the air inlet regulating structure is assembled at the air inlet of the volute 6; the sound pressure detection device 7 is assembled at the volute and close to the air inlet of the volute 6.

[0056] Based on the foregoing embodiments, in this embodiment, the sound pressure detection device 7 is fixed to the volute 6 , and a reasonable distance is required between the sound pressure detection device 7 and the air inlet adjustment structure to ensure the validity of the sound pressure data detected by the sound pressure detection device 7 .

[0057] like Figure 1 As shown, based on the same inventive concept, an embodiment of the present application provides a range hood, which mainly includes the fan described in any one of the aforementioned embodiments.

[0058] Based on the above embodiments, in this embodiment, the fan is a part of a bellows. The range hood further comprises a fume collecting hood, in which a bellows may be arranged. In some embodiments, the bellows is arranged outside the fume collecting hood and connected to the fume collecting hood.

[0059] In the range hood provided in the embodiment of the present application, multiple guide vanes 2 of the air inlet adjustment structure are linked through a transmission member 3, and a driving motor 4 drives a guide vane 2 to deflect. A deflected guide vane 2 drives the other guide vanes 2 to deflect synchronously to adjust the installation angle of all guide vanes 2, thereby realizing the adjustment of the air inlet angle.

[0060] like Figure 8 As shown, based on the same inventive concept, the embodiment of the present application provides a control method for the fan in the above embodiment, which mainly includes steps S101-S104:

[0061] Step S101: after powering off and on, obtaining first sound pressure data multiple times at preset time intervals;

[0062] Step S102: controlling all guide vanes 2 to deflect from a preset position to a first direction by a first angle;

[0063] Step S103: if any two consecutive acquired first sound pressure data meet the preset coarse adjustment rule, control all guide vanes 2 to continue to deflect in the first direction by the first angle;

[0064] Step S104: if the first sound pressure data acquired two times in any consecutive order meet the preset reverse adjustment rule, all the guide vanes 2 are controlled to deflect in the second direction by a second angle;

[0065] Step S105: If the acquired first sound pressure data meets the preset first air inlet angle determination rule, the angle after the guide vane 2 is deflected for the last time is used as the adapted air inlet angle.

[0066] Based on the above embodiments, in this embodiment, the first sound pressure data in step S101 is obtained by the sound pressure detection device 7, which is the sound pressure data obtained when the power is first turned on or turned on again after power is turned off. The first sound pressure data is used to judge the size of the noise and provide a basis for the subsequent adjustment of the deflection angle of the guide vane 2. The number of times the first sound pressure data is obtained is sufficient to determine the adapted air inlet angle in step S104.

[0067] The preset position in step S102 is the most unsuitable extreme air inlet angle, and the noise will be reduced after the guide vane 2 is deflected in any direction at any angle at the preset position. For example, facing the air inlet adjustment structure, the position where the angle between the guide vane 2 and the transmission member is 90 degrees is used as the preset position.

[0068] The adjustment process of the air inlet adjustment structure usually 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 be different under different working conditions. The adapted air inlet angle in step S105 refers to the air inlet angle adapted to the current working condition, at which the controllable noise is minimized.

[0069] The preset time interval in step S101 is 30 seconds. The first direction and the second direction in step S102 and step S103 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.

[0070] By using the fan control method provided in the embodiment of the present application, the guide vane 2 is continuously deflected according to the acquired sound pressure data, so that the guide vane 2 is deflected to an installation angle adapted to the current working condition, so as to improve aerodynamic noise and meet all working conditions.

[0071] As an optional implementation, the coarse adjustment rule in the aforementioned step S103 includes: the difference between the first sound pressure data acquired last time and the first sound pressure data acquired next time is greater than or equal to a preset first sound pressure difference.

[0072] Based on the above embodiments, in this embodiment, the coarse adjustment is to deflect the guide vane 2 at a large angle. If the difference between the first sound pressure data obtained the previous time and the first sound pressure data obtained the next time is greater than or equal to the preset first sound pressure difference, it means that the sound pressure is reduced, that is, the noise is reduced, and it means that there is more room for the noise to decrease. The noise is quickly brought into the range of fine adjustment by the coarse adjustment.

[0073] Optionally, the first sound pressure difference is 0.5 decibel.

[0074] As an optional implementation, the reverse adjustment rule in the aforementioned step S104 includes: the difference between the first sound pressure data acquired at a later time and the first sound pressure data acquired at a previous time is smaller than a preset first sound pressure difference.

[0075] Based on the above embodiments, in this embodiment, fine adjustment is to deflect the guide vane 2 at a small angle. If the difference between the first sound pressure data acquired the last time and the first sound pressure data acquired the previous time is less than the preset first sound pressure difference, it means that the sound pressure has increased, and the guide vane 2 needs to be adjusted in the reverse direction to reduce noise.

[0076] As an optional implementation, the first air inlet angle determination rule in the aforementioned step S105 includes: meeting the reverse adjustment rule twice in a row.

[0077] Based on the foregoing embodiments, in this embodiment, if the reverse adjustment rule is met twice in succession, the installation angle noise of the guide vane 2 after deflection after the fine-tuning rule is met for the first time is very small and can be used as an adaptive air inlet angle, that is, there is no need to deflect the guide vane 2 after the reverse adjustment rule is met for the second time.

[0078] In a specific embodiment, after the first power-on or power-off and then power-on, the guide vane 2 is located at the aforementioned preset position. After 30 seconds, the guide vane 2 is controlled to deflect 10 degrees counterclockwise, that is, the angle at which the guide vane 2 is tangent to the transmission member changes from 90 degrees to 80 degrees. At the same time, the first sound pressure data is obtained for the first time. After 30 seconds, the first sound pressure data is obtained for the second time, and the difference between the first sound pressure data obtained for the first time and the first sound pressure data obtained for the second time is equal to 0.5 decibels. The guide vane 2 is controlled to deflect 10 degrees counterclockwise again, that is, the angle at which the guide vane 2 is tangent to the transmission member changes from 80 degrees to 70 degrees. After 30 seconds, the first sound pressure data is obtained for the third time, and the difference between the first sound pressure data obtained for the second time and the first sound pressure data obtained for the third time is equal to 0.5 decibels. The guide vane 2 is controlled to deflect 10 degrees counterclockwise again, that is, the angle at which the guide vane 2 is tangent to the transmission member changes from 70 degrees to 60 degrees. 30 seconds later, the first sound pressure data is acquired for the fourth time, and the difference between the first sound pressure data acquired for the fourth time and the first sound pressure data acquired for the third time is 0.4 decibels, and the guide vane 2 is controlled to deflect 5 degrees clockwise, that is, the angle at which the guide vane 2 is tangent to the transmission member changes from 60 degrees to 65 degrees. 30 seconds later, the first sound pressure data is acquired for the fifth time, and the difference between the first sound pressure data acquired for the fifth time and the first sound pressure data acquired for the fourth time is 0.3 decibels, and the position at which the angle at which the guide vane 2 is tangent to the transmission member is 65 degrees is used as the adapted air inlet angle.

[0079] like Fig. 9 As shown, as an optional implementation, the control method of the fan further includes steps S201-S204:

[0080] Step S201: after the power is turned on, obtaining the second sound pressure data multiple times at preset time intervals;

[0081] Step S202: If the acquired second sound pressure data meets the preset first pressure increase rule, all guide vanes 2 are controlled to deflect in a second direction by a second angle;

[0082] Step S203: if the newly acquired second sound pressure data meets the preset first fine adjustment rule, all guide vanes 2 are controlled to deflect in the second direction by a second angle;

[0083] Step S204: If the newly acquired second sound pressure data meets the preset second air inlet angle determination rule, the angle after the guide vane 2 is deflected for the last time is used as the new adapted air inlet angle.

[0084] Based on the above embodiments, in this embodiment, the action performed from step S201 without powering off and starting up after the last determination of the adapted air inlet angle, under this working condition, the back pressure may be different from the last working condition, therefore, it is necessary to determine whether the last determined adapted air inlet angle meets the current working condition. The second sound pressure data acquired in step S201 is acquired by the sound pressure detection device 7, and the second sound pressure data is used to determine the size of the noise, providing a basis for the subsequent adjustment of the deflection angle of the guide vane 2. The number of times the second sound pressure data is acquired is sufficient to determine a new adapted air inlet angle.

[0085] If the second sound pressure data obtained in step S202 meets the preset first pressure increase rule, it means that the noise increases and the installation angle of the current guide vane 2 needs to be adjusted, that is, the last determined adaptive air inlet angle does not meet the current working conditions.

[0086] If the newly acquired second sound pressure data in step S203 meets the preset first fine-tuning rule, it means that the deflection direction in step S202 is correct, and the installation angle of the guide vane 2 needs to be fine-tuned. The "newly acquired second sound pressure data" in step S203 and step S204 is the second sound pressure data acquired after step S202. The newly adapted air intake angle in step S204 refers to the air intake angle adapted to the current working condition, at which the controllable noise is minimized.

[0087] In some embodiments, the first pressure increase rule in step S202 includes: the second sound pressure data increases continuously and the increase value is greater than or equal to a preset sound pressure value.

[0088] Optionally, the preset sound pressure value is 1 decibel.

[0089] In some embodiments, the first fine-tuning rule in step S203 includes: a difference between the second sound pressure data newly acquired last time and the second sound pressure data newly acquired next time is greater than or equal to a preset second sound pressure difference.

[0090] Optionally, the second sound pressure difference is 0.3 decibel.

[0091] In some embodiments, the second air inlet angle determination rule in step S204 includes: meeting the first fine-tuning rule twice in a row.

[0092] Based on the foregoing embodiments, in this embodiment, if the first fine-tuning rule is met twice in a row, the installation angle noise of the guide vane 2 after the first fine-tuning rule is deflected will be very small, and can be used as a new adaptive air inlet angle, that is, there is no need to deflect the guide vane 2 after the first fine-tuning rule is met for the second time.

[0093] Based on the foregoing specific embodiments, in a specific embodiment, after determining that the angle at which the guide vane 2 is tangent to the transmission member is 65 degrees as the adapted air inlet angle, without turning off the power and starting up the machine, 30 seconds later, the second sound pressure data is obtained for the first time; 30 seconds later, the second sound pressure data is obtained for the second time; 30 seconds later, the second sound pressure data is obtained for the third time; the difference between the second sound pressure data obtained for the second time and the second sound pressure data obtained for the first time is equal to 1 decibel, and the difference between the second sound pressure data obtained for the third time and the second sound pressure data obtained for the second time is equal to 1.1 decibels, and the guide vane 2 is controlled to deflect 5 degrees clockwise, that is, the angle at which the guide vane 2 is tangent to the transmission member is changed from 65 degrees to 70 degrees. 30 seconds later, the second sound pressure data is obtained for the fourth time, and the difference between the second sound pressure data obtained for the third time and the second sound pressure data obtained for the fourth time is 0.3 decibel, and the guide vane 2 is controlled to deflect 5 degrees clockwise, that is, the angle tangent to the guide vane 2 and the transmission part is changed from 70 degrees to 75 degrees; 30 seconds later, the second sound pressure data is obtained for the fifth time, and the difference between the second sound pressure data obtained for the fourth time and the second sound pressure data obtained for the fifth time is 0.3 decibel, and the position where the angle tangent to the guide vane 2 and the transmission part is 75 degrees is used as the new adapted air inlet angle, and this position is kept unchanged until shutdown.

[0094] like Fig.10 As shown, as an optional implementation, the control method of the fan further includes steps S205-S207:

[0095] Step S205: If the newly acquired second sound pressure data meets the preset second pressure increase rule, all guide vanes 2 are controlled to deflect in the first direction by a first angle;

[0096] Step S206: If the second sound pressure data obtained again meets the preset second fine adjustment rule, all guide vanes 2 are controlled to deflect to the first direction by a second angle;

[0097] Step S207: If the second sound pressure data obtained again meets the preset third air inlet angle determination rule, the angle after the guide vane 2 is deflected for the last time is used as the new adapted air inlet angle.

[0098] Based on the above-mentioned embodiment, in this embodiment, the "newly acquired second sound pressure data" in step S205 is the second sound pressure data acquired after step S202. If the newly acquired second sound pressure data meets the preset second boost rule, it means that the deflection to the second direction in step S202 is an incorrect deflection direction, and a reverse deflection is required, that is, a deflection to the first direction is required to reduce noise; in addition, the deflection angle needs to be appropriately adjusted, so the first angle can be twice the second angle.

[0099] The second sound pressure data obtained in step S206 and step S207 are the second sound pressure data obtained after step S205. The new adapted air inlet angle in step S207 is different from the adapted air inlet angle in the aforementioned step S204. If the aforementioned 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 which step the "new adapted air inlet angle" is, it refers to the air inlet angle adapted to the current working conditions. At this air inlet angle, the controllable noise is minimal.

[0100] In some embodiments, the second pressure boost rule in step S205 includes: the second sound pressure data acquired at a later time is greater than the second sound pressure data acquired at a previous time.

[0101] In some embodiments, the second fine adjustment rule in step S206 includes: a difference between the second sound pressure data acquired last time and the second sound pressure data acquired next time is greater than or equal to a preset second sound pressure difference.

[0102] In some embodiments, the third air inlet angle determination rule in step S207 includes: meeting the second fine-tuning rule twice in a row.

[0103] Based on the foregoing embodiments, in this embodiment, if the second fine-tuning rule is met twice in a row, the installation angle noise of the guide vane 2 after the first deflection after the second fine-tuning rule is met is very small, and can be used as a new adaptive air inlet angle, that is, there is no need to deflect the guide vane 2 after the second fine-tuning rule is met for the second time.

[0104] Based on the foregoing specific embodiments, in another specific embodiment, the second sound pressure data obtained for the fourth time is greater than the second sound pressure data obtained for the third time, and the guide vane 2 is controlled to deflect 10 degrees counterclockwise, that is, the angle tangent to the guide vane 2 and the transmission member is changed from 70 degrees to 60 degrees; 30 seconds later, the second sound pressure data is obtained for the fifth time, and the difference between the second sound pressure data obtained for the third time and the second sound pressure data obtained for the fifth time is 0.3 decibels, and the guide vane 2 is controlled to deflect 5 degrees counterclockwise, that is, the angle tangent to the guide vane 2 and the transmission member is changed from 60 degrees to 55 degrees; 30 seconds later, the second sound pressure data is obtained for the sixth time, and the difference between the second sound pressure data obtained for the fifth time and the second sound pressure data obtained for the sixth time is 0.3 decibels, and the position where the angle tangent to the guide vane 2 and the transmission member is 55 degrees is used as the new adapted air inlet angle, and this position is kept unchanged until shutdown.

[0105] In the description of the present application, it should be understood that the terms "inside" and "outside" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0106] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0107] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0108] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0109] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0110] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. An air inlet adjustment structure, applied to a range hood, characterized in that: include: Guide vane support (1); A plurality of guide vanes (2), all movably connected to the guide vane support (1) and capable of deflecting relative to the guide vane support (1); A transmission member (3) is transmission-connected to all the guide vanes (2); A drive motor (4) is connected to any one of the guide vanes (2) for driving, and the drive motor (4) is used to drive one of the guide vanes (2) to deflect so as to drive the other guide vanes (2) to deflect.

2. The air inlet adjustment structure according to claim 1, characterized in that: The plurality of guide vanes (2) are in the shape of long strips, all the guide vanes (2) are distributed along the periphery of the guide vane support (1), the first ends of all the guide vanes (2) are movably connected to the guide vane support (1), and the second ends are away from the guide vane support (1); The transmission member (3) is annular and surrounds the outer side of the guide vane bracket (1); the transmission member (3) is penetrated through all the guide vanes (2).

3. The air inlet adjustment structure according to claim 2, characterized in that: The transmission member (3) comprises two rings which are spaced apart and concentrically arranged in parallel along the axial direction.

4. The air inlet adjustment structure according to claim 2, characterized in that: Also includes: An air inlet ring (5) surrounds the outer side of the guide vane support (1); The second ends of all the guide vanes (2) are movably connected to the air inlet ring (5).

5. The air inlet adjustment structure according to claim 4, characterized in that: The guide vane support (1) is in the shape of a circular ring, and the plurality of guide vanes (2) are evenly distributed along the circumference of the guide vane support (1) and extend in the radial direction of the guide vane support (1).

6. The air inlet adjustment structure according to claim 5, characterized in that: The first ends of the plurality of guide vanes (2) are inserted through the guide vane support (1); The driving motor (4) is fixed to the inner side of the guide vane support (1) and is drivingly connected to the first end of any one of the guide vanes (2).

7. A fan, characterized in that: include: volute (6); The air inlet regulating structure according to any one of claims 1 to 6, mounted at the air inlet of the volute (6); A sound pressure detection device (7) is mounted on the volute and close to the air inlet of the volute.

8. A range hood, characterized in that: include: The fan as claimed in claim 7.

9. A method for controlling a fan as claimed in claim 7, characterized in that: include: After power is turned off and on, the first sound pressure data is obtained multiple times at preset time intervals; Controlling all guide vanes (2) to deflect from a preset position to a first direction at a first angle; If the first sound pressure data acquired at any two consecutive times meet the preset coarse adjustment rule, all guide vanes (2) are controlled to continue to deflect in the first direction by a first angle; If the first sound pressure data acquired at any two consecutive times meet the preset reverse adjustment rule, all guide vanes (2) are controlled to deflect in a second direction by a second angle; the first direction is opposite to the second direction; and the second angle is smaller than the first angle; If the acquired first sound pressure data conforms to the preset first air inlet angle determination rule, the angle after the guide vane (2) is deflected for the last time is used as the adapted air inlet angle.

10. The control method of the fan according to claim 9, characterized in that: The coarse adjustment rules include: The difference between the first sound pressure data acquired at a previous time and the first sound pressure data acquired at a subsequent time is greater than or equal to a preset first sound pressure difference.

11. The control method of the fan according to claim 9, characterized in that: The reverse adjustment rules include: The difference between the first sound pressure data acquired at a later time and the first sound pressure data acquired at a previous time is smaller than the preset first sound pressure difference.

12. The control method of the fan according to claim 9, characterized in that: The first air inlet angle determination rule includes: The reverse adjustment rule is met twice in a row.

13. The control method of the fan according to claim 9, characterized in that: Also includes: After the power is turned on, the second sound pressure data is obtained multiple times at preset time intervals; If the acquired second sound pressure data meets the preset first pressure increase rule, controlling all guide vanes (2) to deflect in a second direction by a second angle; If the newly acquired second sound pressure data meets the preset first fine adjustment rule, all guide vanes (2) are controlled to deflect in a second direction by a second angle; If the newly acquired second sound pressure data conforms to the preset second air inlet angle determination rule, the angle after the guide vane (2) is deflected for the last time is used as the new adapted air inlet angle.

14. The control method of the fan according to claim 13, characterized in that: Also includes: If the newly acquired second sound pressure data meets the preset second pressure increase rule, all guide vanes (2) are controlled to deflect in a first direction by a first angle; the first angle is twice the second angle; If the second sound pressure data acquired again meets the preset second fine adjustment rule, all the guide vanes (2) are controlled to deflect toward the first direction by a second angle; If the second sound pressure data obtained again meets the preset third air inlet angle determination rule, the angle after the guide vane (2) is deflected for the last time is used as the new adapted air inlet angle.

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