Range hood

Abstract

The invention discloses a range hood which comprises a smoke collecting box, a smoke outlet, a smoke outlet and a smoke outlet. The fan is arranged in the smoke collecting box; the air deflector assembly comprises air deflectors, and the air deflectors are arranged on the front side of the smoke inlet at intervals, so that oil smoke flows to the smoke inlet along the peripheries of the air deflectors; the smoke inlet comprises a main smoke inlet and a plurality of auxiliary smoke inlets surrounding the periphery of the main smoke inlet, the auxiliary smoke inlets are distributed along a circumference and incline in the same direction in the circumferential direction, and the inclination direction of the auxiliary smoke inlets is the same as the rotating direction of the fan.

Description

Technical Field

[0001] This invention relates to an oil fume purification device, and more particularly to an oil fume extractor. Background Technology

[0002] As an essential kitchen appliance in every household, the range hood works by using a high-speed rotating impeller in the casing to draw in cooking fumes from the air inlet, filter the fumes using the impeller, and then expel the filtered fumes from the air outlet, thus purifying the kitchen air.

[0003] Some existing range hoods that use dual air intake fans, such as the side-suction range hood with improved air intake efficiency disclosed in Chinese Patent Application No. 201821741463.3, include a casing and a smoke collection hood with a front opening. A smoke guide plate is provided at the front opening of the smoke collection hood. A fan assembly is provided inside the casing. The fan assembly includes a front air inlet and a rear air inlet. The front air inlet and the rear air inlet form a first gap and a second gap between the rear panel and the front panel of the casing, respectively, for airflow to enter. Following the airflow direction, most of the air rises and enters the first gap, entering through the front air inlet of the fan assembly. Another part of the air enters the second gap, entering through the rear air inlet of the fan assembly.

[0004] In this type of range hood, the cooking fumes are first introduced into the internal duct and then diverted to two opposing axial air inlets on the fan casing, achieving dual air intake. However, during this diversion, the airflow tends to swirl, creating turbulence and reducing smoke extraction efficiency, resulting in increased aerodynamic noise. Furthermore, the negative pressure on the guide plate of this type of range hood is concentrated in the center, with limited negative pressure at the edges, leading to weak smoke control, poor anti-interference capabilities, and an inability to effectively prevent smoke from escaping from the edges. Moreover, the limited diffusion range typically fails to adequately extract smoke from the bottom, resulting in inconsistent smoke extraction performance. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a range hood that improves smoke control capabilities, addressing the shortcomings of the existing technology.

[0006] The second technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a range hood that diverts the oil fume airflow forward, reduces airflow interference, and ensures that the airflow enters the fan smoothly.

[0007] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a range hood, comprising: A smoke collection box, wherein a smoke inlet is provided on the front side of the smoke collection box; The fan is installed inside the smoke collection box; and An air guide plate assembly, the air guide plate assembly including air guide plates, the air guide plates being spaced apart on the front side of the smoke inlet, so that the oil fumes flow along the outer periphery of the air guide plates toward the smoke inlet; Its features are: The smoke inlet includes a main smoke inlet and a plurality of auxiliary smoke inlets surrounding the main smoke inlet. The auxiliary smoke inlets are distributed along a circumference, and each auxiliary smoke inlet is inclined in the same direction along the circumference. The inclination direction of each auxiliary smoke inlet is the same as the rotation direction of the fan.

[0008] The secondary smoke inlet can guide the airflow to flow rapidly along the inclined direction. In conjunction with the rotation of the fan, it drives the airflow inside the smoke collection box, improves the airflow direction, and guides the airflow from natural airflow to vortex airflow. It uses vortex technology to control smoke, and together with 360° surrounding air intake, it achieves better smoke control and improves the smoke extraction effect.

[0009] Furthermore, the auxiliary smoke inlet has a first inlet formed by the end facing the outside of the smoke collection box and a second inlet formed by the end facing the inside of the smoke collection box. Both the first inlet and the second inlet are circular, and the diameter of the first inlet is larger than that of the second inlet. The outer peripheral wall of the smoke collection box forming the auxiliary smoke inlet forms a gradually narrowing flange from the first inlet to the second inlet, and the flange is inclined in the same direction along the circumference.

[0010] The auxiliary smoke inlet, through its variable diameter design, can accelerate the airflow, allowing the oil fume airflow to enter the fan better. The accelerated oil fume airflow, combined with the clockwise rotating oil fume airflow, forms a clockwise vortex airflow.

[0011] Furthermore, each auxiliary flue gas inlet is divided into a first region, a second region, and a third region according to its circumference. The first region, the second region, and the third region are distributed from top to bottom. The diameter of the first inlet of the auxiliary flue gas inlet in the first region is larger than the diameter of the first inlet of the auxiliary flue gas inlet in the second region, and the diameter of the first inlet of the auxiliary flue gas inlet in the second region is larger than the diameter of the first inlet of the auxiliary flue gas inlet in the third region.

[0012] Through the zoning design based on the size of the inlet, a larger inlet diameter corresponds to a larger negative pressure zone, which can better collect smoke (for oil fumes in the diffusion zone), while a smaller inlet diameter corresponds to a higher air intake velocity, which can better extract smoke at high speed (for oil fumes in the oil fume generation zone and the flaming zone).

[0013] Preferably, the center of the circumference of each auxiliary smoke inlet is O, and the center line passing through the center divides the circumference into two symmetrical parts along the width direction of the range hood. The first region and the third region are symmetrical with respect to the center line. The central angle of the first region is α, and the central angle of the third region is β, and the following conditions are met: 80°≤α≤100°, 40°≤β≤70°.

[0014] Furthermore, to facilitate the setting of the smoke inlet, the smoke collection box includes a box body with an open front side and a panel assembly set at the open front side of the box body. The panel assembly includes an opening located behind the air guide plate and a recessed platform formed by the position corresponding to the opening and recessed into the box body. The main smoke inlet and the secondary smoke inlet are located on the recessed platform.

[0015] Furthermore, the settling platform includes a bottom wall and a peripheral wall formed on the outer periphery of the bottom wall. The peripheral wall extends from the outer periphery of the bottom wall to the outer periphery of the opening. The main smoke inlet is located on the bottom wall, and the secondary smoke inlet is located on the peripheral wall. Thus, the secondary smoke inlet can better surround the outer periphery of the main smoke inlet to achieve uniform flow, and it also achieves a concealed design, not exposed to the air guide plate assembly.

[0016] The technical solution adopted by the present invention to solve the second technical problem mentioned above is as follows: the fan has a first air inlet facing the front of the range hood and a second air inlet facing the rear of the range hood; the main air inlet and the first air inlet form a main air inlet channel, and the auxiliary air inlet and the second air inlet form an auxiliary air inlet channel.

[0017] By connecting the main and auxiliary smoke inlets to one of the fan's air inlets, the smoke inlets are separated at the inlet, thus diverting the oil fume airflow forward. This avoids airflow interference caused by the oil fume airflow entering the range hood's internal duct before being diverted, ensuring that the airflow does not interfere with each other in the oil fume channel, thus preventing turbulence, turbulence, and chaotic flow. The oil fume airflow can then smoothly enter the fan, thereby improving the oil fume extraction efficiency.

[0018] Furthermore, to facilitate separation at the smoke inlet, the smoke collection box also includes an air guide ring. The front end of the air guide ring is closely attached to the outer periphery of the main smoke inlet, and the rear end of the air guide ring is closely attached to the outer periphery of the first air inlet, so that the first air inlet is only in fluid communication with the main smoke inlet.

[0019] Furthermore, to reduce noise in the fume duct, noise reduction holes are provided on the air guide ring.

[0020] Furthermore, the smoke collection box includes a box body with an open front side and a panel assembly disposed at the open front side of the box body, wherein the main smoke inlet and the auxiliary smoke inlet are disposed on the panel assembly;

[0021] Baffles are provided on both sides of the housing along the width direction of the range hood. The baffles extend forward from the front edge of the housing, thus extending forward beyond the panel assembly.

[0022] Because the negative pressure of the circumferential suction guide plate is concentrated in the middle and the negative pressure at the edge is limited, the smoke control ability is weak. Therefore, baffles are set on both sides of the box to isolate the oil fumes on both sides, prevent the oil fumes from escaping to both sides, and also prevent the surrounding airflow from affecting the oil fumes absorbed by the smoke inlet, thereby improving the range hood's ability to absorb and exhaust oil fumes against interference.

[0023] Furthermore, the top of the housing extends forward beyond the panel assembly, and the portion of the top of the housing extending beyond the panel assembly constitutes a top smoke-gathering section. This top smoke-gathering section also isolates the top airflow from affecting the smoke entering the center of the range hood, improving the range hood's anti-interference capability. In addition, through the arrangement of the side baffles and the top smoke-gathering section, combined with the central ring-suction smoke intake, full ring-suction of the oil fume airflow is achieved, enabling a good smoke extraction effect even without the rotating baffles of a side-suction range hood.

[0024] Compared with the prior art, the advantages of the present invention are as follows:

[0025] 1. By setting an inclined secondary smoke inlet, the secondary smoke inlet can guide the airflow to flow rapidly along the inclined direction. In conjunction with the rotation of the fan, it drives the airflow inside the smoke collection box, improves the airflow direction, and guides the airflow from natural airflow to vortex airflow. The vortex technology is used to control smoke. Combined with 360° surrounding air intake, it can achieve better smoke control and improve the smoke extraction effect.

[0026] 2. By connecting the main smoke inlet and the auxiliary smoke inlet to one of the fan's air inlets, the smoke inlets are separated at the smoke inlet. This diverts the oil fume airflow forward, avoiding airflow interference caused by the oil fume airflow entering the range hood's internal duct. This ensures that the airflow will not interfere with each other in the oil fume channel, thus preventing turbulence, turbulence, and chaotic flow. The oil fume airflow can smoothly enter the fan, thereby improving the oil fume extraction efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a range hood according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the concealed air guide plate assembly of a range hood according to an embodiment of the present invention; Figure 3 This is a front view of the panel support of the panel assembly of the range hood according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the back of the panel support of the panel assembly of the range hood according to an embodiment of the present invention; Figure 5 for Figure 4 A magnified schematic diagram of part I; Figure 6 This is a schematic diagram of the hidden panel assembly and air guide plate assembly of the range hood according to an embodiment of the present invention; Figure 7 This is a cross-sectional view (horizontal section) of a range hood according to an embodiment of the present invention; Figure 8 This is a cross-sectional view (section and cross-section) of the range hood according to an embodiment of the present invention. Figure 5 (Parallel, with concealed air intake grille); Figure 9 This is a cross-sectional view (front and rear vertical section, with the air inlet mesh hidden) of the range hood according to an embodiment of the present invention; Figure 10 for Figure 9 A magnified schematic diagram of part II; Figure 11 This is a schematic diagram of the open state of the air guide plate assembly of the range hood according to an embodiment of the present invention. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0030] See Figures 1-10 A range hood includes a smoke collection box 1 and a fan 2 disposed inside the smoke collection box 1.

[0031] The smoke collection box 1 includes a box body 11 with an open front side and a panel assembly 12 disposed at the open front side of the box body 11. The upper and lower edges of the panel assembly 12 extend to the upper and lower edges of the open front side of the box body 11, respectively, thereby closing the open front side of the box body 11. A main smoke inlet 13 is provided on the front of the smoke collection box 1. Preferably, the main smoke inlet 13 is located on the panel assembly 12 and at the center of the panel assembly 12 along the width direction of the range hood. The width direction of the range hood refers to the left-right direction when the user faces the range hood in its normal installation state. (See [reference needed]). Figure 1As indicated by arrow X. The front of the smoke collection box 1 refers to the side of the range hood facing the user when it is in normal operating condition.

[0032] The panel assembly 12 includes a panel 121 and a panel support 122. The panel 121 is generally made of glass, which is easier to clean and maintain. The panel support 122 is located on the side of the panel 121 facing inwards towards the housing 11. The panel 121 has an opening 123. In this embodiment, preferably, the cross-section of the opening 123 is circular, where the cross-section refers to the cross-section along the thickness direction of the panel 121. The panel support 122 forms a recessed platform 124 at a position corresponding to the opening 123, which is recessed away from the panel 121 (i.e., towards the interior of the housing 11). The shape and size of the recessed platform 124 are adapted to the opening 123, that is, the shape and size of the recessed platform 124 are substantially consistent with the opening 123.

[0033] The recessed platform 124 includes a bottom wall 1241 and a peripheral wall 1242 formed on the outer periphery of the bottom wall 1241. The peripheral wall 1242 extends from the outer periphery of the bottom wall 1241 toward the panel 121 until it reaches the outer periphery of the opening 123, thereby connecting integrally with the rest of the panel support 122. The aforementioned main smoke inlet 13 is formed on the bottom wall 1241, and its preferred cross-section is also circular, where the cross-section refers to the cross-section along the thickness direction of the bottom wall 1241. The main smoke inlet 13 is smaller than the opening 123. The peripheral wall 1242 is provided with secondary smoke inlets 14, and there may be multiple secondary smoke inlets, which are arranged at intervals along the circumference of the peripheral wall 1242, thereby surrounding the outer periphery of the main smoke inlet 13. In this embodiment, the secondary smoke inlets 14 can almost completely surround the outer periphery of the main smoke inlet 13. Optionally, the number or size of the secondary smoke inlets 14 can also be set as needed, so that they only partially surround the outer periphery of the main smoke inlet 13.

[0034] The fan 2 is housed within the casing 11, and has a first air inlet 21 facing the front of the range hood and a second air inlet 22 facing the rear of the range hood. An air inlet mesh 23 can be installed at the first air inlet 21 for filtration and rectification. The smoke collection box 1 also includes a guide ring 15, which is a complete ring or arc shape. The front end of the guide ring 15 is fitted tightly against the outer periphery of the main smoke inlet 13, and the rear end of the guide ring 15 is fitted tightly against the outer periphery of the first air inlet 21. Thus, the first air inlet 21 is only in fluid communication with the main smoke inlet 13, and the fumes entering from the main smoke inlet 13 can only enter the first air inlet 21. (See [reference]). Figure 7 As indicated by arrow A, this channel constitutes the main smoke inlet channel. The fumes entering the housing 11 from the secondary smoke inlet 14 flow to the rear of the housing 11 and enter the fan 2 through the second air inlet 22. (See [reference]). Figure 7 As indicated by arrow B, this channel constitutes the secondary smoke inlet channel.

[0035] Therefore, the main smoke inlet channel and the secondary smoke inlet channel are separated by the main smoke inlet 13, the secondary smoke inlet 14 and the guide ring 15, so that the oil fume airflow is diverted in front, avoiding a series of problems caused by the diversion of the oil fume airflow after it enters the air duct of the range hood, and ensuring that the airflow will not interfere with each other in the oil fume channel to form turbulence, turbulence and chaotic flow.

[0036] In addition to separating the main smoke inlet channel and the secondary smoke inlet channel, the air guide ring 15 also serves to reduce noise. To this end, noise reduction holes 151 are provided on the air guide ring 15, making it a micro-perforated plate. Optionally, the diameter of the noise reduction holes 151 is 2mm, and the spacing between adjacent noise reduction holes 151 is 8-10mm. Utilizing the principle of micro-perforation noise reduction, the aerodynamic noise in the air inlet channel can be greatly reduced.

[0037] The range hood also includes an air guide plate assembly 3, which includes air guide plates 31 spaced apart on the front side of the opening 123. This allows cooking fumes to enter the opening 123 along the outer periphery of the air guide plates 31, forming a 360° circumferential suction. In this embodiment, the air guide plates 31 are approximately circular, and their dimensions are adapted to fit the opening 123, i.e., substantially the same. See also... Figure 11 Along the width of the range hood, one side of the air guide plate 31 can be rotatably connected to the panel assembly 12, while the opposite side is detachably connected to the panel assembly 12, preferably by means of a snap-fit ​​32. Thus, when cleaning is required, the air guide plate assembly 31 can be easily opened to clean the back of the air guide plate 31 and the panel assembly 12.

[0038] The bottom of the smoke collection box 1 is equipped with an oil cup 4, which is an open cup body used to collect the oil flowing down from the smoke collection box 1.

[0039] The secondary smoke inlet 14 is a circular hole with a variable diameter, meaning it has a first inlet 141 forming one end facing the opening 123 and a second inlet 142 forming one end facing the inside of the housing 11. Both the first inlet 141 and the second inlet 142 are circular, and the diameter of the first inlet 141 is larger than that of the second inlet 142. From the first inlet 141 to the second inlet 142, the outer peripheral wall of the panel support 121 forming the secondary smoke inlet 14 has a tapered flange 143. The flanges 143 can be distributed on the same circumference S (they can be distributed on the same circumference with the center of the first inlet 141) and are inclined in the same direction along the circumference, such as... Figure 4 and Figure 5 As shown, all are tilted counterclockwise, which is consistent with the rotation direction of fan 2, and is used to improve the airflow direction.

[0040] Each of the auxiliary smoke inlets 14 is preferably evenly distributed circumferentially. See also Figure 3Each auxiliary smoke inlet 14 is divided into a first region S1, a second region S2, and a third region S3 according to its circumference S. These regions are distributed sequentially from top to bottom, with dashed lines N1 and N2 separating each region. The center of the circumference S containing each auxiliary smoke inlet 14 is O. A midline M passing through center O divides the circumference S into two symmetrical parts along the width of the range hood. The first region S1 and the third region S3 are symmetrical about the midline M. The central angle of the first region S1 is α, and the central angle of the third region S3 is β. Optionally, 80°≤α≤100°, 40°≤β≤70°, and more preferably, α=90°, β=70°. The first region S1 corresponds to the smoke diffusion zone, the second region S2 corresponds to the smoke explosion zone, and the third region S3 corresponds to the smoke generation zone.

[0041] The diameter of the first inlet 141 of the secondary smoke inlet 14 in the first zone S1 is larger than that of the first inlet 141 of the secondary smoke inlet 14 in the second zone S2, and the diameter of the first inlet 141 of the secondary smoke inlet 14 in the second zone S2 is larger than that of the first inlet 141 of the secondary smoke inlet 14 in the third zone S3. A larger inlet diameter corresponds to a larger negative pressure zone, which can better collect smoke (for oil fumes in the diffusion zone), while a smaller inlet diameter corresponds to a higher airflow velocity, which can better extract smoke at high speed (for oil fumes in the smoke generation and flaming zones).

[0042] This increases the negative pressure zone above the annular air intake, improving smoke control in the diffusion zone. It also increases the wind speed below the annular air intake, allowing for faster extraction of fumes from the flaking zone and achieving a superior smoke extraction effect. The variable diameter design of the secondary smoke inlet 14 and the flange 143 guide the airflow along the inclined direction. Figure 4 and Figure 5 The counterclockwise flow shown in the diagram, combined with the rotation of the fan 2 (the rotation direction is consistent with the tilt direction of the flange 143), drives the airflow inside the smoke collection box 1, improves the airflow direction, guides the airflow from natural airflow to vortex airflow, uses vortex technology to control smoke, and works in conjunction with 360° circumferential air intake to achieve better smoke control and improve the smoke extraction effect.

[0043] The principle of vortex technology for smoke control: By controlling the airflow pattern, disordered cooking fumes are transformed into ordered spiral motion, significantly enhancing the efficiency of fume capture. Tangential velocity drives airflow: As the ring rotates, its surface, through viscosity (such as no-slip boundary conditions), drives the surrounding air to generate circumferential flow (similar to a "dragging effect"). This rotating tangential velocity superimposed on the original axial intake airflow of the range hood, forming a spiral flow and enhancing the airflow's ability to entrain cooking fumes. Momentum transfer: The rotating ring transfers angular momentum to the surrounding fluid, causing cooking fumes that might otherwise escape to be entrained in the spiral flow, reducing lateral escape and improving capture efficiency. Utilizing the viscosity of the airflow itself (such as no-slip boundary conditions), it drives the surrounding air to generate circumferential flow (similar to a "dragging effect"). This rotating tangential velocity superimposed on the original axial intake airflow of the range hood, forming a spiral flow and enhancing the airflow's ability to entrain cooking fumes.

[0044] Traditional range hoods use a fan 2 to generate negative pressure (axial suction layer). The vortex technology of this invention constructs a composite flow field structure, using the secondary smoke inlet 14 on the panel support 121 to form a rotating shear layer. By guiding the airflow from natural airflow to vortex flow, it forms a spiral state that moves closer to the fan 2 before entering the main air intake channel. This makes it difficult for the airflow at the smoke inlet to swirl in the smoke intake area, reducing turbulence or separation, avoiding the diffusion of oil fumes, and enhancing the smoke extraction effect of the range hood.

[0045] The variable diameter structure of the secondary smoke inlet 14 can accelerate the airflow, allowing the oil fume airflow to enter the fan 2 better. The accelerated oil fume airflow, combined with the clockwise rotating oil fume airflow, forms a clockwise vortex airflow.

[0046] Since the air guide plate assembly 3 in this invention is fixedly installed, there is no problem of obstructing the view or limiting the cooking space. Using this air guide plate assembly 3, the cooking visibility is good and the cooking operation space is large. However, its smoke collection ability is limited. Therefore, baffles 16 are respectively installed on both sides of the housing 11 along the width direction of the range hood. The baffles 16 extend forward from the front edge of the housing 11, thus extending forward beyond the panel assembly 12. The baffles 16 can isolate the oil fumes on both sides, preventing the oil fumes from escaping to the sides, and also prevent the surrounding airflow from affecting the smoke intake, improving the anti-interference ability of the range hood in collecting and expelling oil fumes. Preferably, each baffle 16 can gradually tilt from back to front towards the direction of another baffle 16 to guide and gather the oil fumes to the air guide plate assembly 3.

[0047] The top of the housing 11 also extends forward beyond the panel assembly 12. Thus, the portion of the top of the housing 11 that extends beyond the panel assembly 12 constitutes the top smoke collection part 112. At the same time, the top smoke collection part 112 also isolates the influence of the top airflow on the smoke entering the middle of the range hood, thereby improving the range hood's anti-interference ability.

[0048] By setting up the side baffles 16 and the top smoke collection part 112, and in conjunction with the middle ring smoke intake, the entire airflow of oil fumes is collected and drawn in, achieving a good smoke extraction effect even without the baffles of the side-suction range hood having a flip-up movement.

[0049] The range hood of this invention forms a 360° annular negative pressure zone at the air guide plate assembly 3, the main smoke inlet 13, and the secondary smoke inlet 14, achieving the main effects of smoke extraction, smoke control, and smoke concentration. The annular smoke inlet in the middle, combined with the baffles 16 on both sides, increases the negative pressure range and expands the pressure.

[0050] The aforementioned fan 2 can be controlled by a voice module. A controller, a voice receiving module, and a voice parsing module can be installed on the range hood. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the fan 2 to perform corresponding operations, thereby realizing intelligent control of the range hood and improving the user experience.

[0051] The term "fluid connectivity" as used in this invention refers to the spatial relationship between two components or parts (hereinafter referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. This third party can be a fluid channel such as a pipe, channel, conduit, air guide ring, hole, groove, or a chamber that allows fluid to flow through, or a combination of the above.

Claims

1. A range hood, comprising: A smoke collection box (1) is provided with a smoke inlet on the front side; The fan (2) is installed inside the smoke collection box (1); and The air guide plate assembly (3) includes an air guide plate (31) which is spaced apart on the front side of the smoke inlet, so that the oil fumes flow along the outer periphery of the air guide plate (31) to the smoke inlet; Its features are: The smoke inlet includes a main smoke inlet (13) and a plurality of secondary smoke inlets (14) surrounding the main smoke inlet (13). The secondary smoke inlets (14) are distributed along a circumference, and each secondary smoke inlet (14) is inclined in the same direction along the circumference. The inclination direction of each secondary smoke inlet (14) is the same as the rotation direction of the fan (2).

2. The range hood according to claim 1, characterized in that: The auxiliary smoke inlet (14) has a first inlet (141) formed by the end facing the outside of the smoke collection box (1) and a second inlet (142) formed by the end facing the inside of the smoke collection box (1). Both the first inlet (141) and the second inlet (142) are circular, and the diameter of the first inlet (141) is larger than that of the second inlet (142). The outer peripheral wall of the auxiliary smoke inlet (14) of the smoke collection box (1) forms a tapered flange (143) from the first inlet (141) to the second inlet (142). The flange (143) is inclined in the same direction along the circumference.

3. The range hood according to claim 1, characterized in that: Each auxiliary smoke inlet (14) is divided into a first region (S1), a second region (S2), and a third region (S3) according to its circumference (S). The first region (S1), the second region (S2), and the third region (S3) are distributed from top to bottom. The diameter of the first inlet (141) of the auxiliary smoke inlet (14) in the first region (S1) is larger than the diameter of the first inlet (141) of the auxiliary smoke inlet (14) in the second region (S2). The diameter of the first inlet (141) of the auxiliary smoke inlet (14) in the second region (S2) is larger than the diameter of the first inlet (141) of the auxiliary smoke inlet (14) in the third region (S3).

4. The range hood according to claim 3, characterized in that: The center of the circle (S) where each auxiliary smoke inlet (14) is located is O. The center line (M) passing through the center (O) divides the circle (S) into two symmetrical parts along the width direction of the range hood. The first region (S1) and the third region (S3) are symmetrical with respect to the center line (M). The central angle of the first region (S1) is α, and the central angle of the third region (S3) is β, and they satisfy: 80°≤α≤100°, 40°≤β≤70°.

5. The range hood according to any one of claims 1 to 4, characterized in that: The smoke collection box (1) includes a box body (11) with an open front side and a panel assembly (12) provided at the open front side of the box body (11). The panel assembly (12) includes an opening (123) located behind the air guide plate (31) and a recessed platform (124) formed by the position corresponding to the opening (123) and recessed into the box body (11). The main smoke inlet (13) and the secondary smoke inlet (14) are provided on the recessed platform (124).

6. The range hood according to claim 5, characterized in that: The settling platform (124) includes a bottom wall (1241) and a peripheral wall (1242) formed on the outer periphery of the bottom wall (1241). The peripheral wall (1242) extends from the outer periphery of the bottom wall (1241) to the outer periphery of the opening (123). The main smoke inlet (13) is opened on the bottom wall (1241), and the secondary smoke inlet (14) is opened on the peripheral wall (1242).

7. The range hood according to any one of claims 1 to 4, characterized in that: The fan (2) has a first air inlet (21) facing the front of the range hood and a second air inlet (22) facing the rear of the range hood; the main smoke inlet (13) and the first air inlet (21) form a main smoke inlet channel, and the auxiliary smoke inlet (14) and the second air inlet (22) form an auxiliary smoke inlet channel.

8. The range hood according to claim 7, characterized in that: The smoke collection box (1) also includes a guide ring (15). The front end of the guide ring (15) is closely attached to the outer periphery of the main smoke inlet (13), and the rear end of the guide ring (15) is closely attached to the outer periphery of the first air inlet (21), so that the first air inlet (21) is only in fluid communication with the main smoke inlet (13).

9. The range hood according to claim 8, characterized in that: The air guide ring (15) is provided with noise reduction holes (151).

10. The range hood according to any one of claims 1 to 4, characterized in that: The smoke collection box (1) includes a box body (11) with an open front side and a panel assembly (12) provided at the open front side of the box body (11). The main smoke inlet (13) and the secondary smoke inlet (14) are provided on the panel assembly (12). Baffles (16) are provided on both sides of the housing (11) along the width direction of the range hood. The baffles (16) extend forward from the front edge of the housing (11) so that the baffles (16) extend forward beyond the panel assembly (12).

11. The range hood according to claim 10, characterized in that: The top of the housing (11) also extends forward beyond the panel assembly (12), and the portion of the top of the housing (11) that extends beyond the panel assembly (12) constitutes the top smoke collection part (112).

Images