Range hood

Abstract

The invention relates to the technical field of kitchen appliances, and discloses a range hood. The range hood comprises a box body provided with a first inner cavity and a second inner cavity which are communicated with each other; the first-stage fan is located in the first inner cavity; the second-stage fan is located in the second inner cavity; the driving device comprises a first driving piece, and a driving shaft of the first driving piece is connected with the first-stage fan; the first transmission assembly is connected with the first-stage fan; the second transmission assembly is connected with the second-stage fan, and the second transmission assembly is selectively connected with the first transmission assembly; when the second transmission assembly is connected with the first transmission assembly, the first driving piece drives the first-stage fan and the second-stage fan to rotate at the same speed through the first transmission assembly and the second transmission assembly; and when the second transmission assembly is disconnected from the first transmission assembly, the first driving piece drives the first-stage fan to rotate. According to the range hood provided by the invention, the first-stage fan and the second-stage fan are good in same-speed performance.

Description

Technical Field

[0001] The present application relates to the technical field of kitchen appliances, and in particular to a range hood. Background Art

[0002] Range hoods include single-motor range hoods and dual-motor range hoods. Compared to single-motor range hoods, dual-motor range hoods can increase the maximum static pressure to improve the extraction effect.

[0003] In the related art, the range hood includes a housing and a primary fan and a secondary fan located inside the housing. The cooking fume in the kitchen enters the housing and is discharged into an external flue after passing through the air ducts of the primary fan and the secondary fan.

[0004] However, the speed synchronization between the first-stage fan and the second-stage fan is poor. Summary of the Invention

[0005] The present application provides a range hood in which the first-stage fan and the second-stage fan have good speed synchronization.

[0006] The present application provides a range hood, comprising:

[0007] The box body is provided with a first inner cavity and a second inner cavity which are communicated with each other;

[0008] a first-stage fan, located in the first inner cavity;

[0009] A secondary fan is located in the second inner cavity;

[0010] Drive device, including:

[0011] a first driving member, whose driving shaft is connected to the primary blower;

[0012] A first transmission assembly connected to the first-stage fan;

[0013] a second transmission assembly connected to the secondary fan, the second transmission assembly being selectively connectable to the first transmission assembly;

[0014] When the second transmission assembly is connected to the first transmission assembly, the first driving member drives the primary fan and the secondary fan to rotate at the same speed through the first transmission assembly and the second transmission assembly; when the second transmission assembly is disconnected from the first transmission assembly, the first driving member drives the primary fan to rotate.

[0015] The range hood provided in this embodiment includes a housing, a primary fan, a secondary fan, and a drive device. The drive device includes a first drive member, a first transmission assembly, and a second transmission assembly. The drive shaft of the first drive member is connected to the primary fan. The first transmission assembly is connected to the primary fan. The second transmission assembly is connected to the secondary fan, and the second transmission assembly is selectively connected to the first transmission assembly. When a higher air volume is required, the second transmission assembly is connected to the first transmission assembly. The first drive member, through the first and second transmission assemblies, drives the primary and secondary fans to rotate at the same speed, thereby increasing static pressure. When a lower air volume is required, the second transmission assembly is disconnected from the first transmission assembly, and the first drive member drives the primary fan. Thus, when a higher air volume is required, the mechanical connection between the first and second transmission assemblies ensures that the primary and secondary fans rotate at the same speed. Compared to electronic control methods, this provides higher accuracy and reliability. Furthermore, when a lower air volume is required, the first and second transmission assemblies are disconnected, and only the primary fan operates, while the secondary fan does not. In this way, the purpose of energy saving can be achieved with low noise and low energy loss.

[0016] In some embodiments, the drive device includes a drive assembly connected to the second transmission assembly, and the drive assembly is configured to drive the second transmission assembly toward or away from the first transmission assembly to connect or disconnect the first transmission assembly with the second transmission assembly.

[0017] In this way, by setting up the drive assembly, the first transmission assembly and the second transmission assembly can be automatically connected and disconnected, which is very convenient.

[0018] In some embodiments, the first transmission assembly includes:

[0019] A first connecting shaft, the first connecting shaft is connected to the first-stage fan;

[0020] a first transmission shaft, the first transmission shaft being connected to the first connecting shaft via a first transmission member;

[0021] A fixed coupling head is fixedly connected to a side of the first transmission shaft facing away from the first connecting shaft;

[0022] The second transmission assembly includes:

[0023] a second connecting shaft connected to the secondary fan;

[0024] a second transmission shaft, the second transmission shaft being connected to the second connecting shaft via a second transmission member;

[0025] a sliding coupling head, the sliding coupling head being slidably connected to a side of the second transmission shaft facing away from the second connecting shaft, and the driving assembly being connected to the sliding coupling head;

[0026] The driving assembly drives the sliding coupling head to slide along the axial direction of the second transmission shaft to approach or move away from the fixed coupling head, so that the sliding coupling head and the fixed coupling head are engaged or disengaged.

[0027] In this embodiment, the first transmission assembly includes a first connecting shaft, a first transmission member, a first transmission shaft, and a fixed coupling head. The second transmission assembly includes a second connecting shaft, a second transmission member, a second transmission shaft, and a sliding coupling head. The first and second transmission assemblies have relatively simple structures and occupy relatively little space.

[0028] In some embodiments, the drive assembly includes:

[0029] a second driving member;

[0030] a second driving member connected to the box;

[0031] an active rod, one side of the active rod being connected to the drive shaft of the second drive member;

[0032] A driven rod, one side of the driven rod being rotatably connected to a side of the active rod facing away from the second driving member;

[0033] Bracket, the bracket is connected to the box;

[0034] a shift fork, wherein a first side of the shift fork is rotatably connected to a side of the driven rod facing away from the active rod, and a middle area of ​​the shift fork is rotatably connected to the bracket;

[0035] A sliding post is rotatably connected to the second side of the shift fork, with the middle area being located between the first side and the second side; a connecting structure is provided on the outer wall of the sliding coupling head, the connecting structure being arranged around the circumference of the sliding coupling head, the sliding post being partially located within the connecting structure, and the sliding post being slidably connected to the connecting structure;

[0036] The second driving member drives the active rod to rotate, the active rod drives the driven rod to rotate, the driven rod drives the shift fork to rotate relative to the bracket, and the shift fork drives the sliding coupling head to slide along the axial direction of the second transmission shaft through the sliding column.

[0037] The drive assembly provided in this embodiment includes a second drive member, an active rod, a driven rod, a bracket, a shift fork, and a sliding column, which can drive the sliding coupling head to slide axially along the second transmission shaft, thereby achieving engagement and disengagement of the sliding coupling head with the fixed coupling head. Moreover, when the sliding coupling head and the fixed coupling head are engaged, the drive assembly can maintain a connection with the sliding coupling head, thereby limiting the position of the sliding coupling head and effectively preventing the position of the sliding coupling head from changing during rotation of the second rotating shaft.

[0038] In some embodiments, the axis of the primary fan is parallel to the axis of the secondary fan;

[0039] The axis of the first connecting shaft is collinear with the axis of the first-stage fan, and the axis of the second connecting shaft is collinear with the axis of the second-stage fan;

[0040] The axis of the first transmission shaft is perpendicular to the axis of the first-stage fan, and the axis of the second transmission shaft is perpendicular to the axis of the second-stage fan.

[0041] This helps to arrange the drive components compactly and save space.

[0042] In some embodiments, the primary fan is a centrifugal fan, and the range hood further includes a flow guide and noise reduction device, which includes:

[0043] The shell is provided with a third inner cavity, the shell is provided with an air inlet end and an air outlet end, the air outlet end opening of the shell is connected to the third inner cavity, the air inlet end of the shell is connected to the air outlet end of the first-stage fan, and the air outlet end of the shell is opposite to the second-stage fan;

[0044] Multiple partition structures are provided, and the multiple partition structures are located in the third inner cavity. The multiple partition structures are arranged at intervals along the axial direction of the first-stage fan. The extension plane of the partition structure is parallel to the extension plane of the shell. The extension shape of the partition structure matches the extension shape of the shell. The extension plane of the shell is perpendicular to the axial direction of the first-stage fan.

[0045] In this way, due to the characteristics of the centrifugal fan volute itself, the wind blown out by the first-stage fan is unstable. The airflow of the first-stage fan is divided into multiple layers through the shell and multiple partition structures, reducing the mutual influence between unstable airflows, which is beneficial to reducing noise.

[0046] In some embodiments, the partition structure comprises:

[0047] Sound insulation cotton, the extension plane of the sound insulation cotton is parallel to the extension plane of the shell;

[0048] The support frame is connected to the shell, and the sound insulation cotton is connected to the support frame.

[0049] In this way, the sound insulation cotton is used for sound absorption and sound insulation, with obvious effect and low cost. The support member can play a supporting role to facilitate the fixation of the sound insulation cotton, and the setting of the support member is conducive to maintaining the distance between two adjacent partition structures.

[0050] In some embodiments, the orthographic projection of the air outlet end of the first-stage fan toward the plane where the air inlet end of the shell is located is located within the orthographic projection of the shell toward the plane where the air inlet end of the shell is located.

[0051] In this way, the third inner cavity of the shell is larger. When the airflow of the first-stage fan enters the guide noise reduction device, the fluid velocity will be reduced due to the expansion of the space, and the noise will be reduced.

[0052] In some embodiments, there is a distance between the air outlet end of the housing and the secondary fan, and an extension plane of the air outlet end of the housing is parallel to the axis of the secondary fan.

[0053] Compared to the case where the air flowing out of the housing directly enters the secondary fan, the air flowing out of the flow guide and noise reduction device in this embodiment enters the third inner cavity. Within this larger space, the air flow velocity is further reduced, the static pressure of the air is increased, and the dynamic pressure is reduced, which helps to increase the overall static pressure of the range hood and reduce noise.

[0054] In some embodiments, the box body has a first end and a second end opposite to each other along the width direction;

[0055] Along the width direction, the axis of the first-stage fan is close to the center of the first end and the second end, and the air outlet end of the first-stage fan is close to the first end;

[0056] The secondary fan is located above the primary fan and near the second end;

[0057] The shell is located at the top of the first-stage fan, and a smooth transition is provided between the top wall of the shell and the side plate of the shell close to the first end.

[0058] In this way, the interior of the shell is smoother, which reduces the occurrence of turbulence and reduces noise.

[0059] In some embodiments, a smoke-collecting structure that is recessed toward the top is provided at the bottom of the box body. There are two smoke-collecting structures, which are located on both sides of the primary fan along the width direction of the box body. The inner cavity of the smoke-collecting structure is connected to the first inner cavity.

[0060] It also includes two bottom oil nets, which are arranged in a one-to-one correspondence with the two smoke-collecting structures. The bottom oil nets are located in the smoke-collecting structures. The extension plane of the bottom oil nets has an angle with the horizontal plane. The height of the ends of the two bottom oil nets that are away from each other is higher than the height of the ends of the two bottom oil nets that are close to each other.

[0061] In this way, air can enter the second area in a direction perpendicular to the extension plane of the bottom oil net, thereby reducing the influence of the bottom oil net on the air volume, reducing noise and improving the smoking effect.

[0062] In some embodiments, a controller is also included, and the first drive member and the drive assembly are both electrically connected to the controller. The controller is configured to control the drive assembly to operate so that the second transmission assembly is disconnected from the first transmission assembly when receiving a mute command, and control the first drive member to drive the first-stage fan to rotate at a preset speed.

[0063] This is conducive to achieving silent operation of the oil fume suction machine and improving user experience.

[0064] In some embodiments, further comprising:

[0065] a first sensor, the first sensor being electrically connected to the controller and configured to detect the pressure of the flue;

[0066] a second sensor, the second sensor being electrically connected to the controller, the first sensor being configured to detect the outlet air pressure of the secondary fan;

[0067] The controller is configured to control the driving assembly to operate so that the second transmission assembly is connected to the first transmission assembly when the difference between the air outlet pressure and the flue pressure is less than a preset value.

[0068] This is conducive to improving the smoking and exhaust effects of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 A schematic structural diagram of a range hood provided in an embodiment of the present application;

[0070] Figure 2 for Figure 1 A structural diagram from another angle;

[0071] Figure 3 A cross-sectional view of a range hood provided in an embodiment of the present application;

[0072] Figure 4 An exploded view of the range hood provided in an embodiment of the present application;

[0073] Figure 5 A schematic structural diagram of the lower housing of a range hood provided in an embodiment of the present application;

[0074] Figure 6 for Figure 5 A top view of

[0075] Figure 7 for Figure 6 Cross-sectional view along AA direction;

[0076] Figure 8 for Figure 1 A structural diagram from another angle;

[0077] Figure 9 A schematic structural diagram of the range hood provided in an embodiment of the present application with the protective cover removed;

[0078] Figure 10 A schematic diagram of the structure of the range hood provided in an embodiment of the present application with part of the housing removed;

[0079] Figure 11 for Figure 10 Side view of;

[0080] Figure 12A schematic diagram of the structure of the drive device, the primary fan, and the secondary fan in the range hood provided in an embodiment of the present application;

[0081] Figure 13 for Figure 12 A top view of

[0082] Figure 14 A schematic diagram of the structure of a drive assembly in a range hood provided in an embodiment of the present application;

[0083] Figure 15 for Figure 14 A partial enlarged view of point B in the middle;

[0084] Figure 16 A schematic diagram of the structure of the flow guide and noise reduction device in the range hood provided in an embodiment of the present application;

[0085] Figure 17 A side view of the flow guide and noise reduction device in a range hood provided in an embodiment of the present application;

[0086] Figure 18 for Figure 17 Cross-sectional view along CC direction;

[0087] Figure 19 This is a front view of the flow diversion and noise reduction device in the range hood provided in an embodiment of the present application.

[0088] Description of reference numerals:

[0089] 100 - Box body; 110 - Lower box body; 111 - First bottom plate; 112 - First top plate; 113 - First side plate; 114 - First rear back plate; 115 - First front plate; 116 - Main oil screen; 117 - Inner smoke hood; 118 - Partition plate; 1181 - Second communication port; 120 - Upper box body; 121 - Second side plate; 122 - Second rear back plate; 123 - Second front plate; 124 - Second top plate; 130 - Smoke collection structure; 140 - Bottom oil screen; 150 - First inner cavity; 160 - Second inner cavity; 170 - Oil cup; 180 - Control panel assembly; 190 - Lower panel glass assembly; 1100 - Maintenance opening; 1110 - Protective cover;

[0090] 200-first-stage fan;

[0091] 300-secondary fan;

[0092] 400 - driving device; 410 - first driving member; 420 - first transmission assembly; 421 - first connecting shaft; 422 - first transmission shaft; 423 - first transmission member; 424 - fixed coupling head; 430 - second transmission assembly; 431 - second connecting shaft; 432 - second transmission shaft; 433 - second transmission member; 434 - sliding coupling head; 4341 - connecting structure; 440 - driving assembly; 441 - second driving member; 442 - active rod; 443 - driven rod; 444 - bracket; 445 - shift fork; 446 - sliding column; 447 - mounting box;

[0093] 500-flow guide and noise reduction device; 510-housing; 520-partition structure. DETAILED DESCRIPTION

[0094] In related art, a range hood consists of a housing and a primary and secondary fan located within it. Kitchen fumes enter the housing, pass through the air ducts of the primary and secondary fans, and are discharged into an external flue. Sensors detect speed and dynamically adjust the speeds of the primary and secondary fans to ensure they rotate at the same speed. However, electronic control methods often result in poor speed synchronization between the primary and secondary fans.

[0095] Research has found that if the speed of the first-stage fan is higher than that of the second-stage fan, the following problems may occur:

[0096] Unstable airflow: The high speed of the primary fan generates high air volume and pressure. If the secondary fan cannot match this output, it may cause turbulence or backflow at the secondary fan inlet. This unstable airflow can reduce the overall efficiency of the system and lead to poor fume extraction.

[0097] Increased noise: Mismatched fan speeds can increase airflow disturbances within the system, generating additional noise. The noise from the fan and ducting can impact the user experience.

[0098] Reduced efficiency: Cascade fans are designed to work together at specific flow rates and pressures. If the primary fan speed is too high, the overall system efficiency may decrease. Excessively high primary fan speeds can waste energy because some of that energy is used to overcome unnecessary airflow resistance and turbulence.

[0099] If the speed of the first-stage fan is lower than that of the second-stage fan, the following problems may occur:

[0100] Airflow Obstruction: If the primary fan is running at a low speed, it may not be able to provide sufficient air volume and pressure to meet the needs of the secondary fan. This can cause the secondary fan to face insufficient airflow at the inlet. The secondary fan may not be able to reach its designed performance level due to insufficient intake air, resulting in reduced overall system efficiency.

[0101] Idling or reduced efficiency of the secondary fan: The secondary fan may be running partially idle because it is not receiving sufficient airflow from the primary fan. This results in reduced efficiency of the secondary fan. Idling not only wastes energy but can also cause additional wear and tear on the fan.

[0102] System pressure imbalance: Fans in series are designed to gradually increase system pressure. If the output of the first-stage fan is insufficient, the second-stage fan may not be able to effectively increase system pressure. This can lead to a decrease in overall range hood performance and ineffective fume removal.

[0103] Increased noise and vibration: Secondary fans operating under less-than-ideal airflow conditions may generate additional noise and vibration. Unbalanced airflow and pressure may lead to increased airflow disturbances within the system, which in turn increases noise.

[0104] Increased energy consumption: Operating a secondary blower at a low efficiency level results in increased energy consumption as it requires more energy to achieve the required performance level. This not only increases operating costs but can also affect the life of the equipment.

[0105] In order to solve the above technical problems, the present application replaces the electric control with a mechanical structure to achieve the same speed rotation of the first-stage fan and the second-stage fan, thereby improving accuracy.

[0106] Furthermore, in the present application, the primary fan and the secondary fan can be disconnected. After disconnection, the secondary fan has no load, the energy loss is small, the noise is low, and the purpose of energy saving is achieved.

[0107] In order to make the purpose and implementation of this application clearer, the exemplary implementation of this application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only part of the embodiments of this application, not all of the embodiments.

[0108] It should be noted that the brief descriptions of terms in this application are only for the purpose of facilitating the understanding of the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their ordinary and usual meanings.

[0109] In the specification and claims of this application and the accompanying drawings, the terms "first," "second," "third," etc. are used to distinguish similar or similar objects or entities, and are not necessarily intended to limit a particular order or sequence, unless otherwise noted. It should be understood that the terms used in this manner are interchangeable under appropriate circumstances.

[0110] The terms "comprise," "include," and "have," and any variations thereof, are intended to cover but not exclude inclusion; for example, a product or device comprising a list of components is not necessarily limited to all the components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0111] Figure 1 This is a schematic diagram of the structure of the range hood provided in the embodiment of the present application. Figure 2 for Figure 1 A structural diagram from another angle, Figure 3 This is a cross-sectional view of the range hood provided in an embodiment of the present application. Figure 4 This is an exploded view of the range hood provided in an embodiment of the present application.

[0112] See also Figures 1 to 4 As shown, the present application provides a range hood, which includes a housing 100 .

[0113] The housing 100 is provided with a first inner cavity 150 and a second inner cavity 160 that are interconnected. Specifically, the housing 100 includes a lower housing 110 and an upper housing 120. The lower housing 110 is provided with the first inner cavity 150. The upper housing 120 is provided with the second inner cavity 160.

[0114] Figure 5 This is a schematic diagram of the structure of the lower box of the range hood provided in the embodiment of the present application. Figure 6 for Figure 5 Top view of .

[0115] See also Figures 1 to 6 As shown, in some embodiments, the lower box body 110 includes a first bottom plate 111, a first top plate 112, two first side plates 113, a first back plate 114 and a first front plate 115. The first bottom plate 111 and the first top plate 112 are arranged opposite to and spaced apart in the height direction (the direction shown by the Z axis). The two first side plates 113 are arranged opposite to and spaced apart in the width direction (the direction shown by the X axis). The tops of the two first side plates 113 are connected to the first top plate 112, and the bottoms of the two first side plates 113 are connected to the first bottom plate 111. The first back plate 114 is located at the back of the two first side plates 113 in the depth direction (the direction shown by the Y axis), and the first back plate 114 is respectively connected to the two first side plates 113, the first top plate 112 and the first bottom plate 111. The first front panel 115 is located in front of the two first side panels 113 in the depth direction (the direction indicated by the Y axis) and is connected to the two first side panels 113, the first top panel 112, and the first bottom panel 111. The first bottom panel 111, the first top panel 112, the two first side panels 113, the first back panel 114, and the first front panel 115 form a first inner cavity 150.

[0116] It should be noted that the first bottom plate 111 , the first top plate 112 , the two first side plates 113 , the first back plate 114 and the first front plate 115 may be connected by welding, riveting or screws, etc., which is not specifically limited in this embodiment.

[0117] In some embodiments, the first front panel 115 is provided with a front air inlet, which is in communication with the first inner cavity 150 .

[0118] In some embodiments, the lower housing 110 includes a primary oil screen 116, which covers the front air inlet. The primary function of the primary oil screen 116 is to separate grease and other particulate matter from the air. This reduces grease accumulation inside the range hood and in the exhaust duct, keeping the equipment clean and functioning properly.

[0119] In some embodiments, the lower housing 110 includes an inner smoke collecting hood 117. The inner smoke collecting hood 117 can collect smoke and simultaneously form a negative pressure area of ​​a corresponding shape to improve the smoking effect.

[0120] Among them, the inner smoke hood 117 is located in the first inner cavity 150, the top of the inner smoke hood 117 is connected to the first top plate 112, the two sides of the inner smoke hood 117 along the width direction (the direction shown by the X-axis) are respectively connected to the two first side plates 113, and the bottom of the inner smoke hood 117 is connected to the first front plate 115, thereby dividing the first accommodating cavity into a first area and a second area. The first area is located in front of the second area. The first-stage fan 200 is located in the second area. The inner smoke hood 117 is provided with a first connecting port, which is connected to the first area and connected to the second area. The first connecting port is opposite to the air inlet end of the first-stage fan 200.

[0121] In some embodiments, the first top plate 112 is provided with an opening, which is communicated with the second area and with the exterior of the lower box body 110 .

[0122] In some embodiments, the lower housing 110 includes a partition 118. The partition 118 can be used to secure the primary blower 200. The provision of the partition 118 helps increase the overall strength of the unit. Furthermore, the partition 118 separates the upper housing 120 from the lower housing 110, thereby forming relatively independent chambers.

[0123] The partition 118 is connected to the inner smoke hood 117 and the two side walls respectively, and is used to cover the opening of the first top plate 112. The partition 118 is provided with a second communication port 1181, which is connected to the second area and the second inner cavity 160.

[0124] In some embodiments, the partition 118 is provided with a second communication port 1181. After the primary fan 200 is connected to the partition 118, the air outlet of the primary fan 200 abuts against the partition 118, and the opening of the air outlet of the primary fan 200 faces and communicates with the second communication port 1181. The second communication port 1181 communicates with the second inner cavity 160.

[0125] See also Figure 2 As shown, in some embodiments, a smoke-collecting structure 130 that is recessed toward the top is provided at the bottom of the housing 100. Two smoke-collecting structures 130 are provided, and are located on either side of the primary blower 200 along the width direction of the housing 100. The inner cavity of the smoke-collecting structure 130 communicates with the first inner cavity 150. Specifically, the smoke-collecting structure 130 communicates with the second region.

[0126] It is understood that the inward concave design of the smoke-collecting structure 130 can form a smoke-collecting chamber of a certain depth, improving the smoking effect. In addition, the design of the left and right lower air intake and the front air intake is conducive to fully utilizing the capacity of the two-stage fan, which is conducive to meeting the air intake requirements, thereby increasing the maximum static pressure and increasing the air volume.

[0127] See also Figure 2 and Figure 7 As shown, in some embodiments, the housing 100 further includes two bottom grease screens 140. The main function of the bottom grease screens 140 is to separate grease and other particulate matter in cooking fumes from the air. This reduces grease accumulation inside the range hood and in the exhaust duct, keeping the equipment clean and functioning properly.

[0128] The two bottom oil nets 140 are disposed in a one-to-one correspondence with the two smoke-collecting structures 130. The bottom oil nets 140 are located within the smoke-collecting structures 130. The extension plane of the bottom oil nets 140 forms an angle with the horizontal plane. The height of the ends of the two bottom oil nets 140 that are farther away from each other is higher than the height of the ends of the two bottom oil nets 140 that are closer to each other. The height direction is the direction indicated by the Z axis.

[0129] Specifically, the base oil king can be welded to the first bottom plate 111 and the first side plate 113 .

[0130] It can be understood that the axis of the first-stage fan 200 is close to the middle position of the lower box body 110 along the width direction (the direction shown by the X-axis), and the height of the ends of the two bottom oil nets 140 that are away from each other is higher than the height of the ends of the two bottom oil nets 140 that are close to each other, which is conducive to the air entering into the second area in a direction perpendicular to the extension plane of the bottom oil net 140, thereby helping to reduce the impact of the bottom oil net 140 on the air volume, reduce noise, and improve the smoking effect.

[0131] In some embodiments, in an orthographic projection of the range hood onto the plane containing the first rear panel 114, a straight line extending from the axis of the primary fan 200 to the center point of the bottom oil screen 140 along its extension direction is perpendicular to the bottom oil screen 140. Thus, when the primary fan 200 is in operation, a relatively large amount of air enters the second region along a direction perpendicular to the extension plane of the bottom oil screen 140 under the action of the primary fan 200.

[0132] In some embodiments, the housing 100 further includes an oil cup 170. The oil cup 170 is disposed at the bottom of the first base plate 111. The first base plate 111 is provided with an oil drain hole that communicates with the second region. The drain hole is opposite the oil cup 170. Grease in the second region flows through the drain hole into the oil cup 170. Specifically, the oil cup 170 is detachably connected to the first base plate 111.

[0133] In some embodiments, the oil drain hole is located between the two bottom oil screens 140, and the orthographic projection of the bottom oil screens 140 toward the horizontal plane is within the orthographic projection of the oil cup 170 toward the horizontal plane. In other words, the dimension of the oil cup 170 along the X-axis is greater than the distance between the two bottom oil screens 140. This allows grease on the bottom oil screens 140 to flow along the bottom of the bottom oil screens 140 and then drip into the oil cup 170.

[0134] In some embodiments, the range hood includes a control panel assembly 180, which is positioned near the top of the first front panel 115. The control panel assembly 180 can be plugged into the first front panel 115 via an adhesive metal bracket. A user can control the range hood by manipulating the control panel assembly 180.

[0135] In some embodiments, the range hood includes a lower panel glass assembly 190, which is disposed near the bottom of the first front panel 115. The lower panel glass assembly 190 can be plugged into the first front panel 115 via an adhesive metal bracket.

[0136] See also Figure 1 and Figure 2As shown, in some embodiments, the upper box body 120 includes two second side panels 121, a second back panel 122, a second front panel 123, and a second top panel 124. The two second side panels 121 are opposite and spaced apart in the width direction (the direction shown by the X-axis). The bottoms of the two second side panels 121 are connected to the first top panel 112, and the tops of the two second side panels 121 are connected to the second top panel 124. The second back panel 122 is located at the back of the two second side panels 121 in the depth direction (the direction shown by the Y-axis), and the second back panel 122 is respectively connected to the two second side panels 121, the second top panel 124, and the first top panel 112. The second front panel 123 is located at the front of the two second side panels 121 in the depth direction (the direction shown by the Y-axis), and the second front panel 123 is respectively connected to the two second side panels 121, the second top panel 124, and the first top panel 112. The partition plate 118 , the two second side plates 121 , the second rear plate 122 and the second front plate 123 form a second inner cavity 160 .

[0137] The first side panel 113 is flush with the corresponding second side panel 121. The first rear panel 114 is flush with the second rear panel 122, thereby improving the aesthetics.

[0138] In some embodiments, the second top plate 124 is provided with a third communication port. After the secondary fan 300 is connected, the air outlet of the secondary fan 300 abuts against the second top plate 124, and the opening of the air outlet of the secondary fan 300 faces and communicates with the third communication port. The third communication port is used to communicate with the inner cavity of the flue.

[0139] In some embodiments, the range hood includes an electrical box assembly, which is disposed on top of the second top plate 124 .

[0140] Figure 8 for Figure 1 A structural diagram from another angle, Figure 9 A schematic structural diagram of the range hood provided in an embodiment of the present application with the protective cover removed.

[0141] In some embodiments, a maintenance opening 1100 is provided at the back of the housing 100, communicating with the first inner cavity 150 and the second inner cavity 160. A protective cover 1110 is detachably connected to the back of the housing 100. The drive device within the housing 100 can be repaired by removing the protective cover 1110.

[0142] Figure 10 This is a schematic diagram of the structure of the range hood provided in the embodiment of the present application after removing part of the housing. Figure 11 for Figure 10 side view.

[0143] See also Figure 10 and Figure 11As shown, in some embodiments, the range hood includes a primary fan 200. The primary fan 200 is located in the first inner cavity 150.

[0144] The first-stage fan 200 may be a centrifugal fan.

[0145] The first-stage fan 200 may be connected to the inner wall of the lower box body 110 via a bracket.

[0146] The axis of the first-stage fan 200 is parallel to the direction indicated by the Y-axis.

[0147] Illustratively, the primary blower 200 includes a volute and an impeller located in the volute.

[0148] It should be noted that the centrifugal fan has two air inlet ends, which are arranged opposite each other along the direction indicated by the Y-axis. When the primary fan 200 is in operation, air enters the first region through the front air inlet, then enters the primary fan 200 through the air inlet end. The air enters the second region through the inner cavity of the smoke collection structure 130, and then enters the primary fan 200 through the air inlet end. The air in the primary fan 200 then enters the second region through the air outlet end of the primary fan 200 and the second connecting port 1181 on the partition 118.

[0149] In some embodiments, the range hood secondary fan 300 is located in the second inner cavity 160 .

[0150] The secondary fan 300 may be a centrifugal fan.

[0151] The secondary fan 300 may be connected to the inner wall of the upper box body 120 via a bracket.

[0152] The axis of the first-stage fan 200 is parallel to the direction indicated by the Y-axis.

[0153] Exemplarily, the secondary blower 300 includes a volute and an impeller located in the volute.

[0154] It should be noted that the centrifugal fan has two air inlet ends, which are arranged opposite each other along the direction indicated by the Y-axis. When the primary fan 200 is in operation, air enters the first region through the front air inlet, then enters the primary fan 200 through the air inlet end. The air enters the second region through the inner cavity of the smoke collection structure 130, and then enters the primary fan 200 through the air inlet end. The air in the primary fan 200 then enters the second inner cavity 160 through the air outlet end of the primary fan 200 and the second connecting port 1181 on the partition 118.

[0155] In some embodiments, to reduce the size of the range hood along the depth direction of the housing 100 (the direction indicated by the Y axis), the orthographic projections of the primary fan 200 and the secondary fan 300 toward the horizontal plane partially overlap along the depth direction of the housing 100. The secondary fan 300 is located close to the front side of the primary fan 200.

[0156] When the secondary fan 300 is running, the air in the second area enters the secondary fan 300 through the air inlet end of the secondary fan 300, and the air in the secondary fan 300 enters the flue through the air outlet end of the secondary fan 300 and the third connecting port on the second top plate 124.

[0157] In some embodiments, the range hood includes a driving device 400. The driving device 400 is used to drive the primary fan 200 and the secondary fan 300 to rotate.

[0158] Figure 12 This is a schematic diagram of the structure of the drive device, the primary fan and the secondary fan in the range hood provided in the embodiment of the present application. Figure 13 for Figure 12 A top view of Figure 14 This is a schematic diagram of the structure of the driving component in the range hood provided in the embodiment of the present application. Figure 15 for Figure 14 A partial enlarged view of point B in the middle.

[0159] See also Figures 12 to 15 As shown, the driving device 400 includes a first driving member 410 .

[0160] The driving shaft of the first driving member 410 is connected to the first-stage fan 200 .

[0161] In some embodiments, the driving device 400 includes a first transmission assembly 420 , and the first transmission assembly 420 is connected to the first-stage fan 200 .

[0162] Specifically, the first drive member 410 can be a dual-shaft motor, wherein one drive shaft is connected to the impeller of the first-stage fan 200 , and the other drive shaft is connected to the first transmission assembly 420 . Alternatively, the first drive member 410 can be a single-shaft motor, wherein the drive shaft of the first drive member 410 is connected to the impeller of the first-stage fan 200 , and the first transmission assembly 420 is connected to the impeller of the first-stage fan 200 .

[0163] In some embodiments, the driving device 400 includes a second transmission assembly 430 .

[0164] The second transmission assembly 430 is connected to the secondary fan 300 , and the second transmission assembly 430 is selectively connected to the first transmission assembly 420 .

[0165] When the second transmission assembly 430 is connected to the first transmission assembly 420 , the first driving member 410 drives the primary fan 200 and the secondary fan 300 to rotate at the same speed through the first transmission assembly 420 and the second transmission assembly 430 .

[0166] Air enters the first inner cavity 150, enters the second inner cavity 160 through the first-level fan 200, and is then discharged into the flue through the second-level fan 300. The series connection of the first-level fan 200 and the second-level fan 300 increases the static pressure to meet the requirement of large air volume.

[0167] When the second transmission assembly 430 is disconnected from the first transmission assembly 420 , the first driving member 410 drives the primary fan 200 to rotate.

[0168] When air volume demand is low, air enters the first inner chamber 150, passes through the first-stage fan 200, and enters the second inner chamber 160. Air is then discharged into the flue through the second inner chamber 160. The second-stage fan 300 does not operate. This reduces noise and energy consumption, achieving energy conservation.

[0169] It will be appreciated that the range hood provided in this embodiment includes a housing 100, a primary fan 200, a secondary fan 300, and a drive unit 400. The drive unit 400 includes a first drive member 410, a first transmission assembly 420, and a second transmission assembly 430. The drive shaft of the first drive member 410 is connected to the primary fan 200. The first transmission assembly 420 is connected to the primary fan 200. The second transmission assembly 430 is connected to the secondary fan 300, and the second transmission assembly 430 is optionally connected to the first transmission assembly 420. When a higher air volume is required, the second transmission assembly 430 is connected to the first transmission assembly 420. The first drive member 410, through the first transmission assembly 420 and the second transmission assembly 430, drives the primary fan 200 and the secondary fan 300 to rotate at the same speed, thereby increasing static pressure. When a lower air volume is required, the second transmission assembly 430 is disconnected from the first transmission assembly 420, and the first drive member 410 drives the primary fan 200. Thus, when high air volume requirements are met, the mechanical connection between the first and second transmission assemblies 420, 430 ensures that the primary and secondary fans 200, 300 rotate at the same speed. This provides greater precision and reliability than electronically controlled systems. Furthermore, when lower air volume requirements are met, the first and second transmission assemblies 420, 430 are disconnected, allowing only the primary fan 200 to operate while the secondary fan 300 remains inactive. This reduces noise and energy consumption, achieving energy savings.

[0170] See also Figures 12 to 15As shown, in some embodiments, the drive device 400 includes a drive assembly 440. The drive assembly 440 is connected to the second transmission assembly 430. The drive assembly 440 is configured to drive the second transmission assembly 430 toward or away from the first transmission assembly 420 to connect or disconnect the first transmission assembly 420 from the second transmission assembly 430. It will be understood that by providing the drive assembly 440, the first transmission assembly 420 and the second transmission assembly 430 can be automatically connected and disconnected, which is more convenient.

[0171] See also Figures 12 to 15 As shown, in some embodiments, the first transmission assembly 420 includes a first connecting shaft 421. The first connecting shaft 421 is connected to the first-stage fan 200. The axis of the first connecting shaft 421 is collinear with the axis of the impeller of the first-stage fan 200.

[0172] In some embodiments, the first transmission assembly 420 includes a first transmission shaft 422. The first transmission shaft 422 is connected to the first connecting shaft 421 via a first transmission member 423. Specifically, to save space, the axis of the first transmission shaft 422 is perpendicular to the axis of the first connecting shaft 421. The first transmission member 423 may be a bevel gear set with a transmission ratio of 1:1. Alternatively, the first transmission member 423 may be a universal joint.

[0173] In some embodiments, the first transmission assembly 420 includes a fixed coupling head 424. The fixed coupling head 424 is fixedly connected to the side of the first transmission shaft 422 facing away from the first connecting shaft 421. The fixed coupling head 424 rotates synchronously with the first transmission shaft 422. For example, the fixed coupling head 424 and the first transmission shaft 422 can be connected by a pin.

[0174] See also Figures 12 to 15 As shown, in some embodiments, the second transmission assembly 430 includes a second connecting shaft 431. The second connecting shaft 431 is connected to the secondary fan 300. The axis of the second connecting shaft 431 is collinear with the axis of the impeller of the secondary fan 300.

[0175] In some embodiments, the second transmission assembly 430 includes a second transmission shaft 432. The second transmission shaft 432 is connected to the second connecting shaft 431 via a second transmission member 433. Specifically, to save space, the axis of the second transmission shaft 432 is perpendicular to the axis of the second connecting shaft 431. The second transmission member 433 may be a bevel gear set with a transmission ratio of 1:1. Alternatively, the second transmission member 433 may be a universal joint.

[0176] In some embodiments, the second transmission assembly 430 includes a sliding coupling head 434 .

[0177] The sliding coupling head 434 is slidably connected to the side of the second transmission shaft 432 facing away from the second connecting shaft 431, and the drive assembly 440 is connected to the sliding coupling head 434. The sliding coupling head 434 is sleeved on the outer wall of the second transmission shaft 432. The drive assembly 440 is connected to the outer wall of the sliding coupling head 434.

[0178] The driving assembly 440 drives the sliding coupling head 434 to slide along the axial direction of the second transmission shaft 432 to approach or move away from the fixed coupling head 424, so that the sliding coupling head 434 and the fixed coupling head 424 are engaged or disengaged.

[0179] When the sliding coupling head 434 and the fixed coupling head 424 are engaged, the first driving member 410 drives the first-stage fan 200 and the first connecting shaft 421 to rotate, the first connecting shaft 421 drives the first transmission shaft 422 to rotate through the first transmission member 423, the first transmission shaft 422 drives the second transmission shaft 432 to rotate through the sliding coupling head 434 and the fixed coupling head 424, the second transmission shaft 432 drives the first transmission shaft 422 to rotate, the first transmission shaft 422 drives the second connecting shaft 431 to rotate through the second transmission member 433, and the second connecting shaft 431 drives the second-stage fan 300 to rotate.

[0180] When the sliding coupling head 434 and the fixed coupling head 424 are disengaged, the first driving member 410 drives the primary fan 200 and the first connecting shaft 421 to rotate. The first connecting shaft 421 drives the first transmission shaft 422 to rotate via the first transmission member 423, and the first transmission shaft 422 drives the sliding coupling head 434 to rotate. The fixed coupling head 424 does not rotate. The second transmission shaft 432 does not rotate, the second connecting shaft 431 does not rotate, and the secondary fan 300 does not rotate.

[0181] It will be appreciated that in this embodiment, the first transmission assembly 420 includes a first connecting shaft 421, a first transmission member 423, a first transmission shaft 422, and a fixed coupling head 424. The second transmission assembly 430 includes a second connecting shaft 431, a second transmission member 433, a second transmission shaft 432, and a sliding coupling head 434. The first transmission assembly 420 and the second transmission assembly 430 have a relatively simple structure and occupy a small space.

[0182] See also Figures 12 to 15 As shown, the driving assembly 440 includes a second driving member 441 .

[0183] The second driving member 441 is connected to the housing 100. Specifically, the driving assembly 440 is connected to the installation box 447, and the installation box 447 is respectively connected to the first rear back plate 114 and the second rear back plate 122 of the housing 100. The second driving member 441 can be a motor.

[0184] The driving assembly 440 includes an active rod 442 . One side of the active rod 442 is connected to the driving shaft of the second driving member 441 .

[0185] The driving assembly 440 includes a driven rod 443. One side of the driven rod 443 is rotatably connected to the side of the active rod 442 facing away from the second driving member 441.

[0186] The driving assembly 440 includes a bracket 444. The bracket 444 is connected to the box 100. Specifically, the bracket 444 is connected to the installation box 447.

[0187] Drive assembly 440 includes a shift fork 445. A first side of shift fork 445 is rotatably connected to a side of driven rod 443 facing away from active rod 442, and a middle region of shift fork 445 is rotatably connected to bracket 444. The rotation axes of active rod 442, driven rod 443, and shift fork 445 are parallel.

[0188] Drive assembly 440 includes a sliding post 446. Sliding post 446 is rotatably connected to the second side of shift fork 445, with its intermediate region located between the first and second sides. A connecting structure 4341 is provided on the outer wall of sliding coupling head 434. This connecting structure 4341 is disposed circumferentially around sliding coupling head 434. Sliding post 446 is partially located within connecting structure 4341, and is in sliding engagement with the connecting structure 4341.

[0189] The second driving member 441 drives the active rod 442 to rotate, the active rod 442 drives the driven rod 443 to rotate, the driven rod 443 drives the shift fork 445 to rotate relative to the bracket 444, and the shift fork 445 drives the sliding coupling head 434 to slide along the axial direction of the second transmission shaft 432 through the sliding column 446.

[0190] See also Figure 14 As shown, the second driving member 441 drives the active rod 442 to rotate clockwise, the driven rod 443 approaches the first connecting shaft 421, and the shift fork 445 drives the sliding coupling head 434 via the sliding post 446 to move along the axial direction of the second transmission shaft 432 away from the first transmission shaft 422, disengaging the sliding coupling head 434 from the fixed coupling head 424. The second driving member 441 drives the active rod 442 to rotate counterclockwise, the driven rod 443 moves away from the first connecting shaft 421, and the shift fork 445 drives the sliding coupling head 434 via the sliding post 446 to move along the axial direction of the second transmission shaft 432 toward the first transmission shaft 422, engaging the sliding coupling head 434 with the fixed coupling head 424.

[0191] It is understood that the drive assembly 440 provided in this embodiment includes a second drive member 441, an active rod 442, a driven rod 443, a bracket 444, a shift fork 445, and a sliding column 446, which can drive the sliding coupling head 434 to slide axially along the second transmission shaft 432, thereby achieving engagement and disengagement between the sliding coupling head 434 and the fixed coupling head 424. Moreover, when the sliding coupling head 434 is engaged with the fixed coupling head 424, the drive assembly 440 can remain connected to the sliding coupling head 434, thereby limiting the position of the sliding coupling head 434 and effectively preventing the position of the sliding coupling head 434 from changing during the rotation of the second rotating shaft.

[0192] See also Figure 15 As shown, in some embodiments, the connection structure 4341 includes a recessed portion that is recessed toward the axis of the second transmission shaft 432 , and the recessed portion is arranged around the circumference of the sliding coupling head 434 .

[0193] In other embodiments, the drive assembly includes a third drive member, a movable base, and a pusher. The third drive member may be a linear push rod. The drive shaft of the third drive member is connected to the movable base, and the pusher is rotationally connected to the movable base. The pusher is partially located within the connecting structure 4341. The pusher is slidably connected to the connecting structure 4341. The third drive member drives the movable base and the pusher to move axially along the second transmission shaft 432.

[0194] See also Figure 12 and Figure 13 As shown, in some embodiments, the axis of the primary fan 200 is parallel to the axis of the secondary fan 300. The axis of the first connecting shaft 421 is collinear with the axis of the primary fan 200, and the axis of the second connecting shaft 431 is collinear with the axis of the secondary fan 300. The axis of the first transmission shaft 422 is perpendicular to the axis of the primary fan 200, and the axis of the second transmission shaft 432 is perpendicular to the axis of the secondary fan 300. This facilitates a compact arrangement of the drive assembly 440, saving space.

[0195] See also Figure 10 As shown, in some embodiments, the primary fan 200 is a centrifugal fan, and the range hood further includes a flow guide and noise reduction device 500. The flow guide and noise reduction device 500 can absorb sound and control the direction of airflow.

[0196] Figure 16 This is a schematic diagram of the structure of the flow guide and noise reduction device in the range hood provided in the embodiment of the present application. Figure 17 This is a side view of the flow guide and noise reduction device in the range hood provided by an embodiment of the present application. Figure 18 for Figure 17 Cross-sectional view along CC direction.

[0197] See also Figure 10 、 Figures 16 to 18 As shown, the air flow guide and noise reduction device 500 includes a housing 510. The housing 510 is provided with a third inner cavity, an air inlet end and an air outlet end. The opening of the air outlet end of the housing 510 is connected to the third inner cavity, the air inlet end of the housing 510 is connected to the air outlet end of the first-stage fan 200, and the air outlet end of the housing 510 is opposite to the second-stage fan 300.

[0198] Specifically, the air inlet end of the housing 510 is located at the bottom of the housing 510. The air inlet end of the housing 510 abuts the top of the partition 118. The air inlet end of the housing 510 is located on the side of the housing 510 facing the secondary blower. Air blown out by the primary blower 200 enters the housing 510 through the second communication port 1181 and the opening of the air inlet end of the housing 510.

[0199] The flow guide and noise reduction device 500 includes multiple partition structures 520. The multiple partition structures 520 are located in the third inner cavity and are spaced apart along the axial direction of the first-stage fan 200. The extension planes of the partition structures 520 are parallel to the extension plane of the housing 510. The extension shape of the partition structures 520 matches the extension shape of the housing 510. The extension plane of the housing 510 is perpendicular to the axial direction of the first-stage fan 200.

[0200] It is understandable that due to the characteristics of the centrifugal fan volute itself, the wind blown out by the first-stage fan 200 is unstable. The airflow of the first-stage fan 200 is divided into multiple layers through the shell 510 and multiple partition structures 520, reducing the mutual influence between unstable airflows, which is conducive to reducing noise.

[0201] In some embodiments, the spacing between two adjacent layers of partition structures 520 may be the same. In some embodiments, the spacing between two adjacent layers of partition structures 520 may be different. For example, along the axial direction of the first-stage wind turbine 200, the spacing between two adjacent layers of partition structures 520 gradually increases or gradually decreases.

[0202] In some embodiments, the distance between two adjacent layers of separation structures 520 may be 4 to 10 mm.

[0203] In some embodiments, the partition structure 520 includes sound insulation cotton. The extension plane of the sound insulation cotton is parallel to the extension plane of the housing 510. The sound insulation cotton is used for sound absorption and sound insulation, and has a significant effect and low cost.

[0204] Specifically, the sound insulation cotton can be made of a density of 25 to 50 kg / m 3 It is made of polyester fiber cotton within the specified range and has good flame retardant effect.

[0205] In some embodiments, the partition structure 520 includes a support frame connected to the housing 510, and the sound insulation cotton is connected to the support frame. The support member can provide support to facilitate the fixation of the sound insulation cotton, and the provision of the support member helps maintain the spacing between adjacent partition structures 520. Specifically, the support frame can be made of plastic or metal.

[0206] It is understood that the partition structure 520 is provided with sound insulation cotton and a support frame. The sound insulation cotton is used for sound absorption and sound insulation, which is effective and low in cost. The support member can play a supporting role to facilitate the fixation of the sound insulation cotton and maintain the spacing between two adjacent partition structures 520.

[0207] In some embodiments, the orthographic projection of the air outlet of the first-stage fan 200 toward the plane of the air inlet of the housing 510 is located within the orthographic projection of the housing 510 toward the plane of the air inlet of the housing 510. Thus, the third inner cavity of the housing 510 is larger. When the airflow from the first-stage fan 200 enters the flow guidance and noise reduction device 500, the fluid velocity is reduced due to the increased space, thereby reducing noise.

[0208] See also Figure 10 、 Figures 16 to 18 As shown, in some embodiments, the air outlet end of the housing 510 is spaced apart from the secondary fan 300, and the extension plane of the air outlet end of the housing 510 is parallel to the axis of the secondary fan 300. Thus, compared to air flowing out of the housing 510 directly entering the secondary fan 300, in this embodiment, air flowing out of the flow guide and noise reduction device 500 enters the third inner cavity. Within this larger space, the air flow velocity is further reduced, increasing the static pressure while reducing the dynamic pressure of the air, which helps increase the overall static pressure of the range hood and also helps reduce noise.

[0209] Specifically, the extension plane of the air outlet end of the housing 510 is the extension plane of the portion opposite to the air outlet end of the first-stage fan 200 .

[0210] Figure 19 This is a front view of the flow diversion and noise reduction device in the range hood provided in an embodiment of the present application.

[0211] See also Figure 10 and Figure 19 As shown, in some embodiments, the housing 100 has a first end and a second end relative to each other along the width direction (the direction indicated by the X-axis). Along the width direction, the axis of the primary fan 200 is close to the center of the first end and the second end, and the air outlet end of the primary fan 200 is close to the first end. The secondary fan 300 is located above the primary fan 200 and close to the second end. In this way, compared to the case where the axis of the secondary fan 300 is close to the center of the first end and the second end, this embodiment facilitates providing installation space for the diversion and noise reduction device 500, and the size of the diversion and noise reduction device 500 can be larger.

[0212] See also Figure 19 As shown, in some embodiments, the housing 510 is located at the top of the primary blower 200, and a smooth transition is provided between the top wall of the housing 510 and the side panel of the housing 510 near the first end. In this way, the interior of the housing 510 is relatively smooth, reducing the occurrence of turbulence and lowering noise.

[0213] In some embodiments, the angle a between the top wall of the housing 510 and the side panel of the housing 510 near the first end is greater than 90°. Specifically, the angle a between the top wall of the housing 510 and the side panel of the housing 510 near the first end is not less than 100°. Exemplarily, the angle a between the top wall of the housing 510 and the side panel of the housing 510 near the first end is 105°, 110°, 115°, or 120°, etc.

[0214] In some embodiments, the range hood further includes a controller.

[0215] The first drive member 410 and the drive assembly 440 are both electrically connected to the controller. Upon receiving a mute command, the controller is configured to control the drive assembly 440 to disconnect the second transmission assembly 430 from the first transmission assembly 420, and to control the first drive member 410 to drive the primary fan 200 at a preset speed. This facilitates silent operation of the range fumes extraction system and improves the user experience.

[0216] Specifically, the range hood is equipped with a silent mode. When the user selects this function, the second drive member 441 drives the active rod 442 to rotate, causing the driven rod 443 to approach the first connecting shaft 421. The shift fork 445, via the sliding column 446, drives the sliding coupling head 434 to move axially along the second transmission shaft 432, away from the first transmission shaft 422, and the sliding coupling head 434 and the fixed coupling head 424 disengage. The first drive member 410 only drives the primary fan 200 to rotate, while the secondary fan 300 does not rotate. Simultaneously, the input current of the first drive member 410 is adjusted, reducing the speed to operate at the preset speed, thereby reducing power consumption.

[0217] It should be noted that the preset speed can be set according to demand and is not specifically limited in this embodiment.

[0218] In some embodiments, the range hood includes a first sensor electrically connected to the controller and configured to detect the pressure of the flue.

[0219] The range hood includes a second sensor, which is electrically connected to the controller. The first sensor is configured to detect the air outlet pressure of the secondary fan 300.

[0220] The controller is configured to control the driving assembly 440 to operate so as to connect the second transmission assembly 430 with the first transmission assembly 420 when the difference between the outlet air pressure and the flue pressure is less than a preset value.

[0221] It is understandable that when the difference between the outlet pressure and the flue pressure is less than a preset value, it indicates that the pressure in the flue is high, making it difficult for the range hood to discharge oil smoke into the flue. Therefore, the second drive member 441 drives the active rod 442 to rotate, the driven rod 443 moves away from the first connecting shaft 421, and the shift fork 445 drives the sliding coupling head 434 through the sliding column 446 to move along the axial direction of the second transmission shaft 432 toward the first transmission shaft 422, and the sliding coupling head 434 and the fixed coupling head 424 engage. The first drive member 410 drives the primary fan 200 to rotate and the secondary fan 300 to rotate at the same time. In this way, the range hood can increase the static pressure and improve the smoke intake and exhaust effects.

[0222] In some embodiments, the controller is configured to control the drive component 440 to operate so that the second transmission component 430 is connected to the first transmission component 420 when the difference between the outlet pressure and the flue pressure is less than a preset value. At the same time, the controller adjusts the input current of the first drive component 410 and increases the speed to operate at the target speed, thereby increasing the static pressure and improving the smoking and exhaust effects.

[0223] It should be noted that the target speed can be set according to demand, and this embodiment does not make any specific limitation here.

[0224] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0225] For ease of explanation, the above description has been presented in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments have been selected and described to better explain the principles and practical applications, thereby enabling those skilled in the art to better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A range hood, characterized in that: include: The box body (100) is provided with a first inner cavity (150) and a second inner cavity (160) that are communicated with each other; a first-stage fan (200), located in the first inner cavity (150); a secondary fan (300), located in the second inner cavity (160); A driving device (400) comprising: a first driving member (410), a driving shaft of which is connected to the primary fan (200); A first transmission assembly (420) connected to the first-stage fan (200); a second transmission assembly (430) connected to the secondary fan (300), wherein the second transmission assembly (430) is selectively connected to the first transmission assembly (420); When the second transmission assembly (430) is connected to the first transmission assembly (420), the first driving member (410) drives the first-stage fan (200) and the second-stage fan (300) to rotate at the same speed through the first transmission assembly (420) and the second transmission assembly (430); when the second transmission assembly (430) is disconnected from the first transmission assembly (420), the first driving member (410) drives the first-stage fan (200) to rotate.

2. The range hood according to claim 1, characterized in that: The driving device (400) includes a driving component (440), wherein the driving component (440) is connected to the second transmission component (430), and the driving component (440) is configured to drive the second transmission component (430) to approach or move away from the first transmission component (420) so as to connect or disconnect the second transmission component (430) from the first transmission component (420).

3. The range hood according to claim 2, characterized in that: The first transmission assembly (420) comprises: a first connecting shaft (421), the first connecting shaft (421) being connected to the primary fan (200); a first transmission shaft (422), wherein the first transmission shaft (422) is connected to the first connecting shaft (421) via a first transmission member (423); a fixed coupling head (424), the fixed coupling head (424) being fixedly connected to a side of the first transmission shaft (422) facing away from the first connecting shaft (421); The second transmission assembly (430) comprises: a second connecting shaft (431), the second connecting shaft (431) being connected to the secondary fan (300); a second transmission shaft (432), wherein the second transmission shaft (432) is connected to the second connecting shaft (431) via a second transmission member (433); a sliding coupling head (434), the sliding coupling head (434) being slidably connected to a side of the second transmission shaft (432) facing away from the second connecting shaft (431), and the driving assembly (440) being connected to the sliding coupling head (434); The driving assembly (440) drives the sliding coupling head (434) to slide along the axial direction of the second transmission shaft (432) to approach or move away from the fixed coupling head (424), so that the sliding coupling head (434) and the fixed coupling head (424) are engaged or disengaged.

4. The range hood according to claim 3, characterized in that: The drive assembly (440) includes: A second driving member (441) connected to the box (100); an active rod (442), one side of the active rod (442) being connected to the driving shaft of the second driving member (441); an active rod (443), one side of the active rod (443) being rotatably connected to a side of the active rod (442) facing away from the second driving member (441); a bracket (444), the bracket (444) being connected to the box (100); a shift fork (445), wherein a first side of the shift fork (445) is rotatably connected to a side of the active rod (443) facing away from the active rod (442), and a middle area of ​​the shift fork (445) is rotatably connected to the bracket (444); a sliding column (446), wherein the sliding column (446) is rotatably connected to the second side of the shift fork (445), and the intermediate area is located between the first side and the second side; an outer wall of the sliding coupling head (434) is provided with a connecting structure (4341), and the connecting structure (4341) is arranged around the circumference of the sliding coupling head (434), and the sliding column (446) is partially located in the connecting structure (4341), and the sliding column (446) is slidably connected to the connecting structure (4341); The second driving member (441) drives the active rod (442) to rotate, the active rod (442) drives the active rod (443) to rotate, the active rod (443) drives the shift fork (445) to rotate relative to the bracket (444), and the shift fork (445) drives the sliding coupling head (434) to slide along the axial direction of the second transmission shaft (432) through the sliding column (446).

5. The range hood according to claim 3, characterized in that: The axis of the first-stage fan (200) is parallel to the axis of the second-stage fan (300); The axis of the first connecting shaft (421) is collinear with the axis of the first-stage fan (200), and the axis of the second connecting shaft (431) is collinear with the axis of the second-stage fan (300); The axis of the first transmission shaft (422) is perpendicular to the axis of the first-stage fan (200), and the axis of the second transmission shaft (432) is perpendicular to the axis of the second-stage fan (300).

6. The range hood according to any one of claims 1 to 5, characterized in that: The primary fan (200) is a centrifugal fan, and the range hood further comprises a flow guiding and noise reduction device (500), wherein the flow guiding and noise reduction device (500) comprises: A housing (510), wherein the housing (510) is provided with a third inner cavity, the housing (510) is provided with an air inlet end and an air outlet end, the opening of the air outlet end of the housing (510) is in communication with the third inner cavity, the air inlet end of the housing (510) is in communication with the air outlet end of the first-stage fan (200), and the air outlet end of the housing (510) is opposite to the second-stage fan (300); A plurality of partition structures (520), wherein the plurality of partition structures (520) are located in the third inner cavity, and the plurality of partition structures (520) are arranged at intervals along the axial direction of the first-stage fan (200), and the extension plane of the partition structure (520) is parallel to the extension plane of the shell (510), and the extension shape of the partition structure (520) matches the extension shape of the shell (510), and the extension plane of the shell (510) is perpendicular to the axial direction of the first-stage fan (200).

7. The range hood according to claim 6, characterized in that: The partition structure (520) includes: Sound insulation cotton, the extension plane of the sound insulation cotton is parallel to the extension plane of the shell (510); A support frame is connected to the shell (510), and the sound insulation cotton is connected to the support frame.

8. The range hood according to claim 6, characterized in that: The orthographic projection of the air outlet end of the first-stage fan (200) toward the plane where the air inlet end of the shell (510) is located is located within the orthographic projection of the shell (510) toward the plane where the air inlet end of the shell (510) is located.

9. The range hood according to claim 6, characterized in that: There is a distance between the air outlet end of the housing (510) and the secondary fan (300), and the extension plane of the air outlet end of the housing (510) is parallel to the axis of the secondary fan (300).

10. The range hood according to claim 6, characterized in that: The box body (100) has a first end and a second end opposite to each other in the width direction; Along the width direction, the axis of the primary fan (200) is close to the center of the first end and the second end, and the air outlet end of the primary fan (200) is close to the first end; The secondary fan (300) is located above the primary fan (200) and close to the second end; The housing (510) is located on the top of the first-stage fan (200), and a smooth transition is provided between the top wall of the housing (510) and the side panel of the housing (510) close to the first end.

Images