Range hood and range hood control method

Abstract

The present invention relates to the technical field of kitchen equipment, and discloses a range hood and a method for controlling oil smoke suction. The range hood includes a chassis, an exhaust pipe, and a booster fan; the exhaust pipe includes a first pipe and a second pipe, and the smoke outlet of the chassis can be selectively connected to the inlet of the first pipe or the inlet of the second pipe, and the outlet of the first pipe and the outlet of the second pipe are both connected to a common exhaust air duct; the booster fan is arranged in the second pipe. When the resistance in the common exhaust air duct is large, the smoke outlet of the chassis can be connected to the inlet of the second pipe, and the booster fan can be turned on at the same time, so that the booster fan cooperates with the main fan to absorb oil smoke, thereby improving the exhaust efficiency and exhaust effect; when the main fan can meet the exhaust demand by working alone, the smoke outlet of the chassis can be connected to the inlet of the first pipe to prevent the oil smoke from being unable to pass smoothly due to the resistance of the booster fan, thereby further ensuring the exhaust effect.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen equipment, and in particular to a range hood and a range hood control method. Background Art

[0002] The cooking process produces a large amount of fumes, which can be harmful to users' health if they are exposed to them for long periods of time. Furthermore, the fumes from cooking adhere to kitchenware and walls, making them difficult to clean. Therefore, most households install range hoods to alleviate this problem. A range hood is a common kitchen appliance used to purify the kitchen environment. It quickly extracts and exhausts exhaust gases from gas stoves and fumes from cooking, thereby purifying the kitchen air and improving user comfort during cooking.

[0003] A range hood usually includes a smoke collecting chamber, a chassis, an air outlet seat, and an exhaust pipe that are connected in sequence. A fan is installed in the chassis. When it is needed, the fan is started, and the negative pressure in the chassis gradually increases. Under the action of the negative pressure, the kitchen fumes pass through the smoke collecting chamber, the chassis, the air outlet seat, and are then discharged from the exhaust pipe to the public air duct. In order to improve the exhaust efficiency, the range hood in the prior art is equipped with a booster fan in the exhaust pipe to absorb and discharge the fumes together with the fan in the chassis when the resistance of the public air duct is large. However, when a booster fan is installed in the exhaust pipe, when the booster fan is not working, the resistance to the passage of fumes will increase, affecting the exhaust effect. Moreover, when the fumes pass through the booster fan for a long time, oil stains will accumulate on the booster fan, which is inconvenient to clean and also affects the service life of the booster fan.

[0004] Therefore, it is urgent to propose a range hood to solve the above problems. Summary of the Invention

[0005] Based on the above, the purpose of the present invention is to provide a range hood and a range hood control method, which can prevent the booster fan from generating resistance to the passage of oil smoke while ensuring the smoke extraction effect, reduce the accumulation of oil stains on the booster fan, and extend the service life of the booster fan.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The range hood provided by the present invention comprises:

[0008] Chassis;

[0009] The smoke exhaust pipe includes a first pipe and a second pipe. The smoke outlet of the chassis can be selectively connected to the inlet of the first pipe or the inlet of the second pipe. The outlet of the first pipe and the outlet of the second pipe are both connected to a common smoke exhaust duct.

[0010] The booster fan is arranged in the second pipeline.

[0011] As a preferred embodiment of the range hood provided by the present invention, the range hood also includes a switching mechanism, which includes a switching valve body and a valve plate. The switching valve body is provided with a switching inlet, a first switching outlet and a second switching outlet that are connected to each other. The switching inlet is connected to the smoke outlet of the chassis, the first switching outlet is connected to the inlet of the first pipeline, and the second switching outlet is connected to the inlet of the second pipeline. The valve plate is rotatably arranged in the switching valve body and can selectively block the first switching outlet or the second switching outlet.

[0012] As a preferred solution of the range hood provided by the present invention, the switching mechanism further includes a driving assembly, and the driving assembly is configured to drive the valve plate to rotate.

[0013] As a preferred solution of the range hood provided by the present invention, the driving assembly includes:

[0014] A rotary drive member is provided on the switching valve body;

[0015] The transmission structure includes a driving gear, a driven gear and a connecting shaft. The output end of the rotary drive member is connected to the driving gear to drive the driving gear to rotate. The driving gear is meshed with the driven gear, and the connecting shaft is connected to the driven gear.

[0016] The mounting frame is connected to the connecting shaft, and the valve plate is arranged on the mounting frame.

[0017] As a preferred solution of the range hood provided by the present invention, a mounting groove is provided on the mounting frame, and the valve plate can be inserted into the mounting groove.

[0018] As a preferred solution of the range hood provided by the present invention, the driving gear and the driven gear are both bevel gears.

[0019] As a preferred solution of the range hood provided by the present invention, a spherical surface transition is adopted between the switch inlet, the first switch outlet and the second switch outlet.

[0020] As a preferred solution of the range hood provided by the present invention, the drive assembly is arranged between the first pipeline and the second pipeline, and the drive assembly is not higher than the highest point of the switching valve body.

[0021] As a preferred solution of the range hood provided by the present invention, a filter assembly is further provided in the second pipeline, and the filter assembly is located between the booster fan and the smoke outlet of the chassis.

[0022] The present invention further provides a method for controlling oil smoke. Based on the above range hood, the method for controlling oil smoke comprises the following steps:

[0023] Step S1: Determine whether the current speed n of the main fan in the chassis is within the preset speed range [n1, n2]. If not, compare n with n2. If n>n2, execute step S2; if yes, execute step S3.

[0024] Step S2: connecting the smoke outlet of the chassis to the second pipeline and starting the booster fan;

[0025] Step S3: connecting the smoke outlet of the chassis to the first pipeline.

[0026] As a preferred solution of the cooking fume control method provided by the present invention, the method further includes the following steps between step S1 and step S2:

[0027] Calculate Δn=n-n2;

[0028] If 0<Δn≤Δn1, then execute step S2, and after the booster fan operates for the first preset time t1, execute step S3;

[0029] If Δn1<Δn≤Δn2, then execute step S2, and after the booster fan operates for a second preset time t2, execute step S3;

[0030] If Δn2<Δn≤Δn3, then execute step S2, and after the booster fan operates for a third preset time t3, execute step S3;

[0031] Among them, t1<t2<t3.

[0032] The beneficial effects of the present invention are:

[0033] The range hood provided by the present invention includes a chassis, a smoke exhaust pipeline, and a booster fan; the smoke exhaust pipeline includes a first pipeline and a second pipeline, the smoke outlet of the chassis can be selectively connected to the inlet of the first pipeline or the inlet of the second pipeline, and the outlet of the first pipeline and the outlet of the second pipeline are both connected to a common smoke exhaust duct; the booster fan is arranged in the second pipeline. When the resistance in the common smoke exhaust duct is large, the smoke outlet of the chassis can be connected to the inlet of the second pipeline, and the booster fan can be turned on at the same time, so that the booster fan cooperates with the main fan to absorb oil smoke, thereby improving the smoke exhaust efficiency and smoke exhaust effect; when the main fan alone can meet the smoke exhaust requirements, the smoke outlet of the chassis can be connected to the inlet of the first pipeline to prevent the oil smoke from being unable to pass smoothly due to the resistance of the booster fan, further ensuring the smoke exhaust effect, and also reducing the accumulation of oil stains on the booster fan caused by the oil smoke passing through the booster fan for a long time, thereby extending the service life of the booster fan.

[0034] The oil fume control method provided by the present invention can, through the above-mentioned range hood, ensure the suction effect while preventing the oil fume from being unable to pass smoothly due to the resistance generated by the booster fan, reduce the accumulation of oil stains on the booster fan, and extend the service life of the booster fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0036] Figure 1 is a structural schematic diagram of a range hood provided by an embodiment of the present invention;

[0037] Figure 2 is a schematic structural diagram of a switching mechanism provided by an embodiment of the present invention at one viewing angle;

[0038] Figure 3 is a structural schematic diagram of the switching mechanism provided by an embodiment of the present invention from another perspective;

[0039] Figure 4 is a schematic cross-sectional view of the switching mechanism provided by an embodiment of the present invention at a third viewing angle;

[0040] Figure 5 is a schematic diagram of a portion of the structure of a drive assembly provided by an embodiment of the present invention;

[0041] Figure 6 This is a structural diagram of a valve plate blocking a second switching outlet provided by an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of the process of the valve disc rotating from the second switching outlet to the first switching outlet provided by the embodiment of the present invention. Figure 1 ;

[0043] Figure 8 This is a schematic diagram of the process of the valve disc rotating from the second switching outlet to the first switching outlet provided by the embodiment of the present invention. Figure 2 ;

[0044] Figure 9 This is a structural diagram of a valve plate blocking a first switching outlet provided by an embodiment of the present invention;

[0045] Figure 10 is a flow chart of a cooking fume control method provided by an embodiment of the present invention;

[0046] Figure 11This is a working performance curve diagram of the range hood provided by an embodiment of the present invention.

[0047] In the picture:

[0048] 100-suspended ceiling;

[0049] 1- Chassis;

[0050] 2- exhaust pipe; 21- first pipe; 22- second pipe;

[0051] 3- Booster fan;

[0052] 4-switching mechanism; 41-switching valve body; 411-switching inlet; 412-first switching outlet; 413-second switching outlet; 42-valve plate; 43-driving assembly; 431-rotating driving member; 432-driving gear; 433-driven gear; 434-connecting shaft; 435-mounting frame; 4351-mounting slot; 4352-first locking hole; 436-mounting cover; 5-smoke collecting chamber; 6-air outlet seat. DETAILED DESCRIPTION

[0053] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0054] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0055] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0056] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0057] Figure 1 FIG. 1 shows a schematic structural diagram of the range hood provided in this embodiment. Figure 1 As shown, this embodiment provides a range hood, which includes a smoke collecting chamber 5, a chassis 1, an air outlet seat 6, and a smoke exhaust pipe 2. A main fan is provided in the chassis 1. When it is needed, the main fan is started, and the negative pressure in the chassis 1 gradually increases. Under the action of the negative pressure, the kitchen fumes pass through the smoke collecting chamber 5, the chassis 1, the air outlet seat 6, and then are discharged from the smoke exhaust pipe 2 to the public smoke exhaust duct, thereby achieving the effect of purifying the kitchen air. The range hood provided in this embodiment is a ceiling-mounted range hood, that is, the chassis 1 is located inside the ceiling 100, which can achieve the concealment of the chassis 1 and keep the kitchen beautiful and tidy. The fan is located in the chassis 1, far away from the user's ears, which can reduce the noise generated when using the range hood. Of course, in other embodiments, the range hood can also be other types of range hoods, and this embodiment is not limited to this.

[0058] In order to improve the smoke exhaust effect, the range hood also includes a booster fan 3, the smoke exhaust pipe 2 includes a first pipe 21 and a second pipe 22, the smoke outlet of the chassis 1 can be selectively connected to the inlet of the first pipe 21 or the inlet of the second pipe 22, and the outlet of the first pipe 21 and the outlet of the second pipe 22 are both connected to a common smoke exhaust duct; the booster fan 3 is arranged in the second pipe 22. When the resistance in the public smoke exhaust duct is large, the smoke outlet of the chassis 1 can be connected to the inlet of the second pipe 22, and the booster fan 3 can be turned on at the same time, so that the booster fan 3 can cooperate with the main fan to absorb oil smoke, thereby improving the smoke exhaust efficiency and smoke exhaust effect; when the main fan can meet the smoke exhaust requirements by working alone, the smoke outlet of the chassis 1 can be connected to the inlet of the first pipe 21 to prevent the oil smoke from being unable to pass smoothly due to the resistance of the booster fan 3, further ensuring the smoke exhaust effect, and also reducing the accumulation of oil stains on the booster fan 3 caused by the oil smoke passing through the booster fan 3 for a long time, thereby extending the service life of the booster fan 3.

[0059] Furthermore, a filter assembly is also provided in the second pipeline 22, and the filter assembly is located between the booster fan 3 and the smoke outlet of the chassis 1. By arranging the filter assembly upstream of the booster fan 3, the filter assembly can filter the oil in the smoke, prevent the oil from accumulating on the booster fan 3 and the downstream section of the second pipeline 22, and further extend the service life of the booster fan 3 and the second pipeline 22. Of course, in other embodiments, a filter assembly can also be provided in the first pipeline 21 to prevent the oil from accumulating on the wall of the first pipeline 21 and affecting the service life of the first pipeline 21. This embodiment does not limit the specific structure of the filter assembly, and any filter assembly in the prior art that can filter the oil is within the protection scope of this embodiment.

[0060] Figure 2 FIG. 4 shows a schematic structural diagram of the switching mechanism 4 provided in this embodiment at a viewing angle. Figure 2 Combined with Figure 1 As shown, the range hood further includes a switching mechanism 4, which includes a switching valve body 41 and a valve plate 42. The switching valve body 41 is provided with a switching inlet 411, a first switching outlet 412, and a second switching outlet 413, which are interconnected. The switching inlet 411 is connected to the smoke outlet of the chassis 1, the first switching outlet 412 is connected to the inlet of the first pipeline 21, and the second switching outlet 413 is connected to the inlet of the second pipeline 22. The valve plate 42 is rotatably disposed within the switching valve body 41 and can selectively block the first switching outlet 412 or the second switching outlet 413. By blocking the first switching outlet 412 or the second switching outlet 413 by the valve plate 42, the smoke outlet of the chassis 1 is connected to the first pipeline 21, or the smoke outlet of the chassis 1 is connected to the second pipeline 22.

[0061] In this embodiment, both the first pipeline 21 and the second pipeline 22 are circular tube structures, and the cross-section of the valve disc 42 is circular to ensure that the valve disc 42 effectively blocks the first switching outlet 412 or the second switching outlet 413. Optionally, a spherical surface transition is used between the switching inlet 411, the first switching outlet 412, and the second switching outlet 413 to provide space for the valve disc 42 to rotate and ensure smooth rotation of the valve disc 42 within the switching valve body 41.

[0062] Furthermore, the switching mechanism 4 further includes a driving assembly 43 , which is configured to drive the valve disc 42 to rotate, so as to achieve automatic switching of the valve disc 42 between the first switching outlet 412 and the second switching outlet 413 .

[0063] Figure 3 FIG. 4 shows a schematic structural diagram of the switching mechanism 4 provided in this embodiment from another perspective. Figure 4 FIG. 4 is a cross-sectional schematic diagram of the switching mechanism 4 provided in this embodiment at a third viewing angle. Figure 5 FIG. 4 is a schematic diagram showing a portion of the structure of the drive assembly 43 provided in this embodiment. Figure 3-Figure 5 Combined with Figure 1 As shown, the drive assembly 43 includes a rotary drive member 431, a transmission structure, and a mounting bracket 435. The rotary drive member 431 is mounted on the switching valve body 41. The transmission structure includes a driving gear 432, a driven gear 433, and a connecting shaft 434. The output end of the rotary drive member 431 is connected to the driving gear 432 to drive the driving gear 432 to rotate. The driving gear 432 meshes with the driven gear 433, and the connecting shaft 434 is connected to the driven gear 433. The mounting bracket 435 is connected to the connecting shaft 434, and the valve disc 42 is mounted on the mounting bracket 435. In this embodiment, the rotary drive member 431 can be a rotary motor. When the rotating drive member 431 is working, it can drive the driving gear 432 to rotate, and at the same time drive the driven gear 433 and the connecting shaft 434 to rotate, and drive the valve plate 42 to rotate through the mounting bracket 435, thereby realizing the automatic switching of the valve plate 42 between the first switching outlet 412 and the second switching outlet 413, so that the smoke outlet of the chassis 1 can be selectively connected to the first pipe 21 or the second pipe 22 according to the resistance of the common smoke exhaust duct.

[0064] In this embodiment, the rotary drive member 431, transmission structure, and portion of the mounting bracket 435 are all located outside the switching valve body 41. This prevents the drive assembly 43 from creating resistance to oil smoke when located inside the switching valve body 41, thereby ensuring the effective smoke exhaust of the range hood. Optionally, the drive assembly 43 also includes a mounting cover 436, located between the first and second conduits 21, 22. The rotary drive member 431, transmission structure, and portion of the mounting bracket 435 are housed within the mounting cover 436. Preferably, the mounting cover 436 is no higher than the highest point of the switching valve body 41, ensuring that the installation of the drive assembly 43 does not increase the overall height of the switching mechanism 4, thereby preventing interference between the switching mechanism 4 and the ceiling of the suspended ceiling 100.

[0065] Optionally, both the driving gear 432 and the driven gear 433 are bevel gears. Bevel gear transmission enables vertical orthogonal transmission, changing the direction of the connecting shaft 434 and achieving a horizontal rotation profile of the valve plate 42 through the vertical rotation plane of the driving gear 432. Furthermore, bevel gear transmission offers the advantages of good meshing performance, smooth transmission, low noise, and a compact structure. This can reduce the size of the drive assembly 43 to a certain extent, improving the stability and safety of the range hood.

[0066] like Figure 3 and Figure 5 As shown, the mounting frame 435 is provided with a mounting groove 4351, and the valve plate 42 can be inserted into the mounting groove 4351, which facilitates assembly and improves assembly efficiency. Optionally, the opening of the mounting groove 4351 is flared to facilitate the insertion of the valve plate 42.

[0067] To enhance the stability of the connection between the valve disc 42 and the mounting bracket 435 and prevent the valve disc 42 from dislodging from the mounting slot 4351 of the mounting bracket 435 during rotation, in this embodiment, the mounting bracket 435 is further provided with a first locking hole 4352, which communicates with the mounting slot 4351. The valve disc 42 is provided with a second locking hole (not shown in the figure), through which a locking member can sequentially pass to connect the valve disc 42 to the mounting bracket 435. Optionally, the first locking hole 4352 is a threaded hole, the second locking hole is a through hole, and the locking member is a screw. The screw connection has the advantages of a stable connection and convenient assembly.

[0068] In another embodiment, the second locking hole may not be provided on the valve disc 42 , and the locking member may pass through the first locking hole 4352 and press the valve disc 42 against the groove wall of the installation groove 4351 , which can also achieve the above-mentioned effect.

[0069] In another embodiment, the first locking hole 4352 may not be provided on the mounting frame 435, and the second locking hole may not be provided on the valve plate 42. When the valve plate 42 is inserted into the mounting groove 4351, the valve plate 42 and the mounting frame 435 are adhered to each other by adhesive, which can also achieve the above-mentioned effect.

[0070] Figure 6 A schematic structural diagram of the valve plate 42 provided in this embodiment blocking the second switching outlet 413 is shown. Figure 7 The schematic diagram shows the process of the valve plate 42 provided in this embodiment rotating from the second switching outlet 413 to the first switching outlet 412. Figure 1 . Figure 8 The schematic diagram shows the process of the valve plate 42 provided in this embodiment rotating from the second switching outlet 413 to the first switching outlet 412. Figure 2 . Figure 9 Schematic diagram of the structure of the valve plate 42 provided in this embodiment blocking the first switching outlet 412 is shown. Figure 6-Figure 9 Combined with Figure 1 As shown, an oil fume flow rate detector (not shown) is provided at the location where the outlet of the first pipeline 21 and the outlet of the second pipeline 22 communicate. The oil fume flow rate detector is used to detect the flow rate of oil fume discharged from the outlet of the first pipeline 21 or the outlet of the second pipeline 22 into the common exhaust duct, thereby adjusting the speed of the main fan in real time according to the oil fume flow rate to ensure exhaust efficiency. This embodiment does not limit the specific model of the oil fume flow rate detector; any oil fume flow rate detector capable of detecting oil fume flow in the prior art can be used.

[0071] For example, Figure 1 and Figure 6As shown, in the initial state, the valve plate 42 blocks the second switching outlet 413, and the oil smoke in the kitchen passes through the smoke collecting chamber 5, the chassis 1, and the air outlet seat 6 in sequence and is discharged from the first pipe 21 to the public exhaust duct; when the resistance of the public exhaust duct increases, the oil smoke flow discharged from the outlet of the first pipe 21 to the public exhaust duct decreases, and the speed of the main fan will increase to improve the exhaust capacity; Figure 1 、 Figure 7-Figure 9 As shown, when the current speed of the main fan cannot meet the demand, the drive assembly 43 can drive the valve plate 42 to rotate to block the first switching outlet 412, and at the same time start the booster fan 3. The kitchen fumes pass through the smoke collecting chamber 5, the chassis 1, and the air outlet seat 6 in sequence, and are discharged from the second pipe 22 to the common exhaust duct. When the resistance of the common exhaust duct decreases, the drive assembly 43 drives the valve plate 42 to rotate again to block the second switching outlet 413. And so on. This control method can improve the smoke extraction effect. When the resistance of the common exhaust duct is large, the booster fan 3 is turned on to cooperate with the main fan to absorb and discharge the kitchen fumes. When the current speed of the main fan can meet the current smoking demand, the booster fan 3 is turned off, and the fumes are discharged from the first pipe 21 without the booster fan 3. This prevents the fumes from being unable to be discharged smoothly due to the resistance caused by the booster fan 3, reduces the accumulation of oil stains on the booster fan 3, and extends the service life of the booster fan 3.

[0072] Figure 10 FIG. 1 shows a flow chart of the oil smoke control method provided in this embodiment. Figure 10 Combined with Figure 1 As shown, this embodiment also provides a method for controlling oil smoke intake based on the above range hood, and the method comprises the following steps:

[0073] Step S1: Determine whether the current speed n of the main fan in the chassis 1 is within the preset speed range [n1, n2]. If not, compare n with n2. If n>n2, execute step S2; if yes, execute step S3.

[0074] Step S2: connecting the smoke outlet of the chassis 1 to the second pipe 22 and starting the booster fan 3;

[0075] Step S3: connecting the smoke outlet of the chassis 1 to the first pipe 21 .

[0076] Figure 11 FIG. 1 shows the working performance curve of the range hood provided by this embodiment. Figure 11 Combined with Figure 1 As shown in the figure, when the current speed n of the main fan is within the preset speed range [n1, n2], the smoke extraction effect of the range hood is the best; when the public exhaust duct is fully blocked, the speed n of the main fan is n = n maxWhen the resistance of the public exhaust duct is the smallest, the speed of the main fan is n = n min After the range hood is started, its built-in controller can adjust the speed of the main fan in real time according to the specific working conditions of the public exhaust duct to meet the kitchen purification needs.

[0077] When the current speed n of the main fan is within the preset speed range [n1, n2], it means that the current speed n of the main fan can meet the kitchen purification needs. At this time, the valve plate 42 blocks the second switching outlet 413, and the oil smoke in the kitchen passes through the smoke collecting chamber 5, the chassis 1, and the air outlet seat 6 in turn and is discharged from the first pipe 21; when the current speed n of the main fan is greater than n2, it means that the resistance in the public smoke exhaust duct is large, and the oil smoke flow discharged from the first pipe 21 is small. The current speed of the main fan can no longer meet the kitchen purification needs. At this time, the drive component 43 drives the valve plate 42 to rotate to block the first switching outlet 412, and at the same time starts the booster fan 3. The oil smoke in the kitchen passes through the smoke collecting chamber 5, the chassis 1, and the air outlet seat 6 in turn and is discharged from the second pipe 22 to the public smoke exhaust duct. The oil fume control method provided in this embodiment can meet the kitchen purification needs, ensure the exhaust effect and efficiency, prevent the oil fume from being unable to pass smoothly due to the resistance generated by the booster fan 3, and reduce the accumulation of oil stains on the booster fan 3, thereby extending the service life of the booster fan 3.

[0078] Further, continue to refer to Figure 1-Figure 3 as well as Figure 10-11 , further comprising between step S1 and step S2:

[0079] Calculate Δn=n-n2;

[0080] If 0<Δn≤Δn1, then execute step S2, and after the booster fan 3 operates for the first preset time t1, execute step S3;

[0081] If Δn1<Δn≤Δn2, then execute step S2, and after the booster fan 3 operates for the second preset time t2, execute step S3;

[0082] If Δn2<Δn≤Δn3, then execute step S2, and after the booster fan 3 operates for the third preset time t3, execute step S3;

[0083] Among them, t1<t2<t3.

[0084] When the range hood controller determines that the current speed n of the main fan is greater than n2, it continues to calculate Δn=n-n2 to determine whether the current speed n of the main fan exceeds the range of the preset speed range. When 0<Δn≤Δn1, it means that the resistance of the public exhaust duct does not increase significantly at this time, but the current speed n of the main fan cannot meet the kitchen purification needs. The driving component 43 drives the valve plate 42 to rotate to block the first switching outlet 412 and starts the booster fan 3 at the same time. The booster fan 3 can be turned off after the auxiliary work for the first preset time t1. The driving component 43 then drives the valve plate 42 to rotate to block the second switching outlet 413; when Δn1<Δn≤Δn2, it means that the public exhaust duct is The resistance of the smoke and air duct increases significantly, and the driving component 43 drives the valve plate 42 to rotate to block the first switching outlet 412, and at the same time starts the booster fan 3. The booster fan 3 can be closed after the auxiliary work for the second preset time t2, and the driving component 43 drives the valve plate 42 to rotate to block the second switching outlet 413; when Δn2<Δn≤Δn3, it means that the resistance of the public smoke exhaust duct increases significantly at this time, and the driving component 43 drives the valve plate 42 to rotate to block the first switching outlet 412, and at the same time starts the booster fan 3. The booster fan 3 can be closed after the auxiliary work for the third preset time t3, and the driving component 43 drives the valve plate 42 to rotate to block the second switching outlet 413.

[0085] In this embodiment, t1 = 3 minutes; t2 = 5 minutes; and t3 = 8 minutes. This embodiment does not limit the specific values ​​of t1, t2, and t3. Designers can adjust them according to actual needs to ensure optimal smoke exhaust performance and achieve energy savings. This can also reduce the time the main fan and booster fan 3 operate simultaneously, reduce continuous noise, and enhance the user experience.

[0086] To further improve smoke exhaust efficiency, when 0 < Δn ≤ Δn1, the resistance of the common smoke exhaust duct increases insignificantly, in which case booster fan 3 can be operated at a low speed. When Δn1 < Δn ≤ Δn2, the resistance of the common smoke exhaust duct increases significantly, in which case booster fan 3 can be operated at a medium speed. When Δn2 < Δn ≤ Δn3, the resistance of the common smoke exhaust duct increases significantly, in which case booster fan 3 can be operated at a high speed. This design allows the speed of booster fan 3 to match the kitchen's purification needs, ensuring smoke exhaust efficiency while achieving energy savings.

[0087] Optionally, after step S3, the method further includes: step S4: returning to step S1. This design can adjust the position of the valve plate 42 in real time, so that the range hood always maintains the best smoking effect during the entire working process.

[0088] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A range hood, characterized in that: include: A chassis (1), wherein a main fan is provided in the chassis (1); A smoke exhaust pipe (2) comprising a first pipe (21) and a second pipe (22); a smoke outlet of the chassis (1) can be selectively connected to an inlet of the first pipe (21) or an inlet of the second pipe (22); and an outlet of the first pipe (21) and an outlet of the second pipe (22) are both connected to a common smoke exhaust duct; A booster fan (3) is arranged in the second pipeline (22); When the main fan working alone can meet the smoke exhaust demand, the smoke outlet of the chassis (1) is connected to the inlet of the first pipe (21); when the main fan working alone cannot meet the smoke exhaust demand, the smoke outlet of the chassis (1) is connected to the inlet of the second pipe (22), and the booster fan (3) is turned on at the same time, so that the booster fan (3) cooperates with the main fan to absorb oil smoke.

2. The range hood according to claim 1, characterized in that: The range hood further comprises a switching mechanism (4), the switching mechanism (4) comprising a switching valve body (41) and a valve plate (42), the switching valve body (41) being provided with a switching inlet (411), a first switching outlet (412) and a second switching outlet (413) which are connected to each other, the switching inlet (411) being connected to the smoke outlet of the chassis (1), the first switching outlet (412) being connected to the inlet of the first pipeline (21), and the second switching outlet (413) being connected to the inlet of the second pipeline (22), the valve plate (42) being rotatably arranged in the switching valve body (41) and being capable of selectively blocking the first switching outlet (412) or the second switching outlet (413).

3. The range hood according to claim 2, characterized in that: The switching mechanism (4) further comprises a driving assembly (43), wherein the driving assembly (43) is configured to drive the valve plate (42) to rotate.

4. The range hood according to claim 3, characterized in that: The drive assembly (43) comprises: A rotary drive member (431) is provided on the switching valve body (41); A transmission structure comprising a driving gear (432), a driven gear (433) and a connecting shaft (434), wherein the output end of the rotary drive member (431) is connected to the driving gear (432) to drive the driving gear (432) to rotate, the driving gear (432) is meshed with the driven gear (433), and the connecting shaft (434) is connected to the driven gear (433); The mounting frame (435) is connected to the connecting shaft (434), and the valve plate (42) is arranged on the mounting frame (435).

5. The range hood according to claim 4, characterized in that: The mounting frame (435) is provided with a mounting groove (4351), and the valve plate (42) can be inserted into the mounting groove (4351).

6. The range hood according to claim 4, characterized in that: The driving gear (432) and the driven gear (433) are both bevel gears.

7. The range hood according to claim 3, characterized in that: The drive assembly (43) is arranged between the first pipeline (21) and the second pipeline (22), and the drive assembly (43) is not higher than the highest point of the switching valve body (41).

8. The range hood according to claim 2, characterized in that: A spherical surface transition is adopted between the switching inlet (411), the first switching outlet (412) and the second switching outlet (413).

9. The range hood according to any one of claims 1 to 8, characterized in that: A filter assembly is also provided in the second pipeline (22), and the filter assembly is located between the booster fan (3) and the smoke outlet of the chassis (1).

10. A method for controlling oil smoke, based on the range hood according to any one of claims 1 to 9, characterized in that: The cooking fume control method comprises the following steps: Step S1: Determine whether the current speed n of the main fan in the chassis (1) is within the preset speed range [n1, n2]. If not, compare n with n2. If n>n2, execute step S2; if yes, execute step S3. Step S2: connecting the smoke outlet of the chassis (1) to the second pipeline (22), and starting the booster fan (3); Step S3: connecting the smoke outlet of the chassis (1) to the first pipeline (21).

11. The cooking fume control method according to claim 10, characterized in that: The method further includes between step S1 and step S2: Calculate Δn=n-n2; If 0<Δn≤Δn1, then executing step S2, and after the booster fan (3) operates for a first preset time t1, executing step S3; If Δn1<Δn≤Δn2, then executing step S2, and after the booster fan (3) operates for a second preset time t2, executing step S3; If Δn2<Δn≤Δn3, then executing step S2, and after the booster fan (3) operates for a third preset time t3, executing step S3; Among them, t1<t2<t3.

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