Intelligent range hood and control method thereof

Abstract

The invention discloses an intelligent extractor hood and a control method thereof, the intelligent extractor hood comprises a smoke collecting box, a smoke outlet, a smoke outlet and a smoke outlet, the front surface of the smoke collecting box is provided with a smoke inlet; 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 air guide plate assembly comprises an auxiliary fan for sucking airflow, facing one side of the smoke inlet, of the air guide plate into the air guide plate, and the back face, facing the smoke collecting box, of the air guide plate is provided with a flow guide fin for converting the airflow sucked by the auxiliary fan into vortex airflow and guiding the vortex airflow to the smoke inlet. The multiple flow guide fins are arranged at intervals in the circumferential direction.

Description

Technical Field

[0001] This invention relates to smart kitchen appliances, and in particular to a smart range hood and a control method for the smart range hood. 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] Commonly used side-draft range hoods typically feature a flip-up baffle to improve smoke collection. This baffle opens when the hood is operating, forming a smoke-collecting chamber. For example, Chinese Patent Application No. 202211159807.0 discloses a range hood comprising a smoke collection hood and a baffle. The baffle is movably connected to the smoke collection hood and has three states: closed, working, and cleaning. In these states, the angles formed by the baffle and the smoke collection hood are a1, a2, and a3, respectively, with a3 > a2 > a1. However, with this type of range hood, the open baffle obstructs the view, limiting the user's cooking visibility. Furthermore, the open baffle restricts the operating space during cooking, making it particularly unsuitable for tall cookware.

[0004] To address this, a range hood has been developed, such as the one disclosed in Chinese Patent Application No. 202310030720.1, which includes: a range hood housing with a base plate and a smoke inlet formed on the base plate; a fan assembly disposed inside the range hood housing; and a guide vane located outside the base plate for guiding fumes through the flow channel between the guide vane and the base plate into the smoke inlet. This fixed guide vane structure can solve the problems of the aforementioned baffles obstructing the view and occupying cooking space when opened. However, during cooking with large amounts of fumes or when stirring, the low installation height prevents the escaped fumes from being sucked in and exhausted. Furthermore, side-suction range hoods generally have higher noise levels due to the closer proximity of the fan to the cook, resulting in poor aerodynamic noise. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing an intelligent range hood that improves smoke control and enhances smoke extraction.

[0006] The second technical problem to be solved by the present invention is to provide a control method for the above-mentioned intelligent range hood.

[0007] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: an intelligent range hood, comprising: A smoke collection box, wherein the front of the smoke collection box is provided with a smoke inlet; 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 air guide plate assembly includes an auxiliary fan that draws airflow toward the side of the air guide plate facing the smoke inlet into the air guide plate. The back of the air guide plate facing the smoke collection box is provided with guide vanes that convert the airflow drawn in by the auxiliary fan into vortex airflow and guide it toward the smoke inlet. There are multiple guide vanes that are spaced apart along the circumferential direction.

[0008] Therefore, by adding an auxiliary fan and utilizing the guide vanes on the back of the air guide plate to generate auxiliary directional high-speed airflow, the surrounding airflow is driven to form a vortex airflow (generating a vortex effect). After forming a spiral shape, the airflow enters the main smoke inlet, making it less likely for the airflow to swirl in the main smoke inlet area, reducing turbulence or separation, avoiding the diffusion of oil fumes, and enhancing the smoke extraction effect of the range hood. The air guide plate and the main smoke inlet area form a stable vortex structure. These vortex airflows can guide the oil fumes to gather towards the center instead of spreading to the surrounding areas. The rotation-induced circumferential flow enhances the suction effect: combined with 360° annular smoke intake, a 360° ultra-large annular negative pressure area is formed near the main smoke inlet, achieving better smoke control.

[0009] Preferably, each airflow guide vane is airfoil shaped, and each airflow guide vane has a first end for the airflow blown out by the auxiliary fan to flow into and a second end for blowing out the airflow, the second end being open to form an air outlet.

[0010] Furthermore, at least a portion of the back of the air guide plate gradually bulges towards the smoke collection box from the periphery to the center, thus forming a protrusion. The guide vanes are disposed on the outer periphery of the protrusion and are interconnected. The first end of each guide vane is located on the periphery of the protrusion, and the second end of each guide vane is away from the protrusion. The auxiliary fan is disposed inside the protrusion, and the side of the protrusion facing the smoke inlet has an auxiliary air inlet for airflow outside the air guide plate to enter the auxiliary fan. This constructs a composite flow field structure, utilizing the directional high-speed airflow formed by the guide vanes and the auxiliary fan to form a rotating shear layer. This layer of airflow couples with the axial airflow, generating an ordered spiral airflow path.

[0011] Furthermore, to facilitate the intake of oil fumes into the fume collection box, the range hood also includes a main fan installed inside the fume collection box. The main fan has at least a main air inlet facing the front of the range hood. The main air inlet and the main smoke inlet form a main smoke intake channel. The guide vanes cooperate with the negative pressure generated by the rotation of the main fan to generate a vortex.

[0012] Furthermore, to facilitate the setting of the main 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 a position corresponding to the opening and recessed into the box body. The main smoke inlet is set on the recessed platform.

[0013] Furthermore, the settling platform includes a bottom wall and a peripheral wall formed on the outer periphery of the bottom wall, the peripheral wall extending from the outer periphery of the bottom wall to the outer periphery of the opening, and the main smoke inlet is located on the bottom wall. Thus, the peripheral wall can play a certain guiding role.

[0014] Furthermore, the bottom wall and / or peripheral wall have a shape in which the diameter gradually decreases from the opening side toward the direction away from the opening, thereby the bottom wall and / or peripheral wall can better play the role of guiding the flow.

[0015] Furthermore, the panel assembly also includes a panel and a panel support disposed on the side of the panel facing the housing body, the opening being provided on the panel, and the recess being formed on the panel support. In the art, the panel support is typically a sheet metal part, which can easily form a recess and have openings in the recess.

[0016] Furthermore, the panel forms a first rounded corner and a second rounded corner at the edge of the opening. The first rounded corner transitions from the outer surface of the panel towards the interior of the housing, and the second rounded corner transitions from the end of the first rounded corner towards the inner surface of the panel. Thus, the two rounded corners create a smooth transition between the outer and inner surfaces of the panel, making the airflow path more aerodynamic. The airflow area is free of sharp turns, reducing turbulence and ensuring that the flue gas entering the main fan is well guided, reducing wind resistance and noise.

[0017] Furthermore, the smoke collection box also includes an air guide ring. The front end of the air guide ring is closely fitted to the outer periphery of the main smoke inlet, and the rear end of the air guide ring is closely fitted to the outer periphery of the main air inlet, so that the main air inlet is only in fluid communication with the main smoke inlet. The air guide ring can better guide the oil fume airflow to the main air inlet of the main fan, avoiding unnecessary diffusion flow.

[0018] Furthermore, to reduce noise in the fume duct, noise reduction holes are provided on the air guide ring.

[0019] The first technical solution adopted by the present invention to solve the second technical problem mentioned above is: a control method for an intelligent range hood, which adopts the intelligent range hood as described above, characterized in that: the intelligent range hood further includes a sound sensor for detecting noise transmitted from the smoke inlet and an oil fume sensor for detecting the state of oil fume airflow around the air guide plate;

[0020] The control method includes the following steps: 1) Power on, the range hood starts working, set a counter value n for the number of times the main fan speed is adjusted, and the initial value of n is 0; 2) The oil fume sensor detects the state of the oil fume; 3) If the fume sensor detects no smoke escape, maintain the current smoke extraction status; if the fume sensor detects smoke escape, proceed to step 4). 4) Let n = n + 1, increase the main fan speed so that the adjusted speed V = V0 + n * V1, where V0 is the initial main fan speed and V1 is the main fan speed adjustment unit value; 5) Detect again whether there is any oil fume escaping from the smoke intake area using the oil fume sensor. If yes, return to step 4); otherwise, proceed to step 5. 6) The sound sensor (53) detects the current noise S and determines whether S > Smax is true. Smax is the comfortable noise value that the human ear can tolerate. If it is true, proceed to step 7); otherwise, maintain the current smoking state. 7) Let V = V0 - n * V1, and turn on the auxiliary fan.

[0021] Therefore, by using oil fume sensors and sound sensors to monitor the airflow status of the main air inlet and the overall noise level of the machine, the auxiliary airflow is dynamically adjusted to achieve the best smoke control effect with the minimum noise index.

[0022] The second technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a control method for an intelligent range hood, which adopts the intelligent range hood as described above, characterized in that: the intelligent range hood further includes a wind speed sensor for detecting the wind speed of the main air inlet and an oil fume sensor for detecting the state of the oil fume airflow around the air guide plate;

[0023] The control method includes the following steps: 1) Power on, and the range hood will start working; 2) The oil fume sensor detects the state of the oil fume; 3) If the fume sensor detects no smoke escape, proceed to step 4); if the fume sensor detects smoke escape, turn on the auxiliary fan and use the directional high-speed airflow of the auxiliary fan to drive the fume airflow to present a swirling suction steady state motion, and return to step 2). 4) The wind speed sensor detects the wind speed T at the main air inlet; 5) Determine if the relationship T≤Tmax holds true for the wind speed T at the main air inlet. Tmax is the maximum allowable wind speed at the main air inlet. If not, reduce the auxiliary fan speed and return to step 2).

[0024] Therefore, based on real-time detection by oil fume sensors and wind speed sensors, the fan speed is dynamically adjusted according to the oil fume escape status and the air inlet wind speed to achieve a stable vortex airflow state. By using vortex technology in conjunction with the main fan and 360° annular air inlet, a better smoke control effect can be achieved.

[0025] Compared with existing technologies, the advantages of this invention are as follows: the guide vanes can be used to improve the airflow direction, guiding the surrounding airflow into a spiral state from natural airflow to vortex airflow, which then enters the main smoke inlet in a spiral shape. This prevents the airflow from swirling within the main smoke inlet area, reducing turbulence or separation, avoiding the diffusion of oil fumes, and enhancing the smoke extraction effect of the range hood. Vortex technology is used for smoke control, combined with 360° circumferential smoke intake to achieve better smoke control and improve smoke extraction efficiency. The guide vane and the main smoke inlet area form a stable vortex structure, and these vortex airflows can guide oil fumes to gather towards the center rather than diffuse outwards. The rotation-induced circumferential flow enhances the suction effect: combined with 360° circumferential smoke intake, a 360° ultra-large annular negative pressure area is formed near the main smoke inlet, achieving better smoke control. Attached Figure Description

[0026] 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 schematic diagram of the concealed air guide plate assembly and oil cup of a range hood according to an embodiment of the present invention; Figure 4 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 5 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 6 This is a schematic diagram of the air guide plate assembly of a range hood according to an embodiment of the present invention; Figure 7 This is an exploded structural diagram of the air guide plate assembly of the range hood according to an embodiment of the present invention; Figure 8 A side view of the air guide plate assembly of the range hood according to an embodiment of the present invention forming a vortex; Figure 9 A front view of the vortex formed by the air guide plate assembly of the range hood according to an embodiment of the present invention; Figure 10 This is a flowchart illustrating the vortex smoke control process of a range hood according to an embodiment of the present invention; Figure 11 This is a flowchart of an alternative example of vortex smoke control in a range hood according to an embodiment of the present invention. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] 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.

[0029] See Figures 1-5 A smart range hood includes a smoke collection box 1 and a main fan 2 installed inside the smoke collection box 1.

[0030] 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 smoke inlet 13 is provided on the front of the smoke collection box 1. Preferably, the 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 1 As 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.

[0031] 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.

[0032] 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 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 section along the thickness direction of the bottom wall 1241. The smoke inlet 13 is smaller than the opening 123. The diameter of the peripheral wall 1242 can gradually decrease from the opening 123 side toward the direction away from the opening 123. The bottom wall 1241 can be a flat plate, or it can be like the peripheral wall 1242, having a shape where the diameter gradually decreases from the opening 123 side toward the direction away from the opening 123. Therefore, the peripheral wall 1242 and the bottom wall 1241 can play a guiding role and have a Coanda effect on the oil fumes. The Coanda effect is used to make the oil fume airflow rotate along the wall, further expanding the negative pressure zone and achieving a better smoke control effect (the effective suction range can be extended downward to the oil cup 4 (which will be detailed below) and upward to the top of the smoke collection box 1).

[0033] The main fan 2 is housed within the casing 11 and has at least a main air inlet 21 facing the front of the range hood. An air inlet mesh 23 can be installed at the main air inlet 21 for filtration and rectification. The smoke collection box 1 also includes an air guide ring 15, which is a complete ring or arc shape. The front end of the air guide ring 15 is closely attached to the outer periphery of the smoke inlet 13, and the rear end of the air guide ring 15 is closely attached to the outer periphery of the main air inlet 21. Thus, the main air inlet 21 is only in fluid communication with the smoke inlet 13, and the fumes entering from the smoke inlet 13 can only enter the main air inlet 21, which constitutes the main smoke intake channel.

[0034] 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, aerodynamic noise in the air intake channel can be greatly reduced.

[0035] The range hood also includes an air guide plate assembly 3, which includes an air guide plate. The air guide plate includes a first plate 31 and a second plate 32 disposed on the side of the air guide plate 32 facing the panel assembly 12. The combination of the first plate 31 and the second plate 32 is located at an interval in front of the opening 123, thereby allowing cooking fumes to enter the opening 123 along the outer periphery of the first plate 31 and the second plate 32, forming a 360° circumferential suction. In this embodiment, the first plate 31 and the second plate 32 are each approximately circular, and their dimensions are adapted to the opening 123, i.e., substantially the same.

[0036] See Figures 5-7The second plate 32 at least partially protrudes from the periphery towards the center towards the panel assembly 12, thus forming a protrusion 321. A plurality of guide vanes 33 are arranged around the outer periphery of the protrusion 321 at intervals along the circumference (i.e., along a circumferential direction) of the protrusion 321. Each guide vane 33 is airfoil-shaped, having a first end 331 facing the periphery of the protrusion 321 and a second end 332 away from the protrusion 321. Each guide vane 33 can be bent along the circumferential direction, and the bending directions of all guide vanes 33 are consistent, uniformly arranged along the center of the back plate 32.

[0037] The space formed between the protrusions 321 of the first plate 31 and the second plate 32 accommodates an auxiliary fan 34. An auxiliary air inlet 322 is formed on the side of the protrusion 321 facing the smoke inlet 13. A guide vane 33, like the protrusion 321, is also protruding and connected to the protrusion 321. The second end 332 of the guide vane 33 opens to form an air outlet 333. Thus, the auxiliary fan 34 draws in airflow (primarily air) from the auxiliary air inlet 322 and blows it out from the air outlet 333. The airflow blown out from the air outlet 333 is tangential to the guide vane (i.e., the airflow direction forms a 90° angle with the line connecting the edge of the guide vane to its center). The main purpose of this arrangement is to utilize the directional high-speed airflow generated by the auxiliary fan 34 to guide the surrounding airflow (using the principle of air ejection in aerodynamics), causing the surrounding air to flow in a regular pattern and forming a vortex airflow.

[0038] By adding an auxiliary fan 34 and utilizing the guide vanes 33 on the back of the guide plate to generate an auxiliary directional high-speed airflow, combined with the rotation of the main fan 2, the surrounding airflow is driven to form a vortex airflow (generating a vortex effect). This vortex technology is used to control smoke, and combined with a 360° annular air intake, better smoke control is achieved, improving the fume extraction effect and mitigating airflow separation near the annular air intake, thereby reducing aerodynamic noise. (See also...) Figure 8 The arrow indicates the vortex flow path, which flows towards the flue gas inlet 13 after forming a spiral. Figure 9 The hollow arrows in the image represent the auxiliary directional high-speed airflow formed by the auxiliary fan 34 and the guide vane 33, while the solid arrows represent the path of the oil fume flow.

[0039] Furthermore, the high-speed airflow generated by the auxiliary fan 34 has an ejector effect, driving the surrounding airflow. Combined with the negative pressure (axial suction layer) generated by the main fan 2, the vortex technology of this invention constructs a composite flow field structure. The high-speed directional airflow generated by the auxiliary fan forms a rotating shear layer. This layer of airflow is coupled with the axial airflow to generate an orderly spiral airflow path.

[0040] Vortex technology for smoke control works by controlling the airflow pattern to transform disordered oil fumes into ordered spiral motion, significantly enhancing the efficiency of oil fume collection. The vortex enhancement principle includes: 1. Centrifugal aggregation effect: Oil fume particles are subjected to centrifugal force in the rotating flow field (F=mw). 2 r), gather towards the center of the vortex to avoid escaping to the surroundings; 2. Low-resistance traction effect: the center of the spiral airflow forms a low-pressure core area (15%-20% lower than the traditional negative pressure), which generates a strong traction force on the edge oil fumes.

[0041] Traditional range hoods use the main fan 2 to generate negative pressure (axial suction layer). The vortex technology of this invention constructs a composite flow field structure, using the guide vanes 33 on the guide plate and the auxiliary fan 34 to form a rotating shear layer. The airflow in this layer is coupled with the axial airflow to generate an orderly spiral airflow path.

[0042] The effects of the aforementioned vortex are classified as Level 1 technical effects, and it also has the following effects:

[0043] Secondary technical effect: The air guide plate and the smoke inlet 13 area of ​​the panel 12 form a stable vortex structure. These vortex airflows can guide the oil fumes to gather towards the center instead of spreading to the surrounding areas.

[0044] Level 3 technical effect: Enhancing the entrainment effect by utilizing rotation-induced circumferential flow: Combined with 360° circumferential smoke intake, a 360° ultra-large annular negative pressure area is formed near the main smoke inlet, achieving better smoke control:

[0045] 1. Tangential velocity drives airflow:

[0046] When the ring rotates, its surface, through viscosity (such as in the case of no-slip boundary conditions), causes the surrounding air to flow in a circumferential direction (similar to a "dragging effect"). This tangential velocity of rotation is superimposed on the original axial intake airflow of the range hood, forming a spiral flow that enhances the airflow's ability to entrain and draw in cooking fumes.

[0047] 2. Momentum transfer:

[0048] The rotating ring transfers angular momentum to the surrounding fluid, causing the oil fumes that might otherwise escape to be drawn into the spiral flow, reducing lateral escape and improving capture efficiency.

[0049] The airflow itself, due to its viscosity (such as in the case of no-slip boundary conditions), drives the surrounding air to generate a circumferential flow (similar to a "dragging effect"). This rotating tangential velocity is superimposed on the original axial intake airflow of the range hood, forming a spiral flow that enhances the airflow's ability to entrain and draw in cooking fumes.

[0050] In this embodiment, the first plate 31 is typically a glass panel, while the second body 32 is a sheet metal part, and the two are fixed together. Optionally, the air guide plate can also be a one-piece molded plate. The air guide plate simply needs to protrude from the front side away from the smoke inlet and the front side facing the smoke inlet, respectively.

[0051] The bottom of the smoke collection box 1 is equipped with an oil cup 4, which is an open cup at the top.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] The range hood of this invention forms a 360° annular negative pressure zone at the air guide plate assembly 3 and the smoke inlet 13, achieving the main effects of smoke extraction, smoke control, and smoke concentration. Comprehensive smoke control is achieved through the 360° annular ultra-large negative pressure zone (the central annular smoke inlet). The central annular smoke inlet, combined with the side baffles 16, increases the negative pressure range and expands the pressure. The overall front-to-back dimensions are controlled within 400mm, reducing the risk of head bumps.

[0056] A wind speed sensor 51 can be installed on one side of the main air inlet 21 of the main fan 21, preferably close to the main air inlet 21. An oil fume sensor 52 can be installed on the front of the smoke collection box 1, preferably located on the top of the box 11, and there can be two sensors spaced apart along the width of the range hood. The oil fume sensor 52 can be an infrared thermal imaging sensor, which can identify the flow state of oil fumes in real time, visualize the flow direction of the smoke, and compare it with the preset oil fume state in the system to analyze the flow state of the oil fumes. The top placement is mainly for better detection of the oil fume state at the annular suction inlet. The infrared probe can directly illuminate the area covering the air inlet, indicating that the escaping oil fumes are those with a clear airflow escaping from the annular suction inlet area and not being effectively sucked in. The range hood also includes a sound sensor 53 for detecting noise emanating from the smoke inlet 13.

[0057] See Figure 10 The aforementioned vortex smoke control technology can automatically adjust the auxiliary airflow velocity according to the airflow velocity under different operating conditions to adapt to different boundary layer thicknesses, ensuring good rectification and noise reduction effects under different operating conditions and improving the performance of the range hood. Its control process includes the following steps: 1) Power on, the range hood starts working, set the count value n for the number of times the main fan 2 speed is adjusted, the initial value of n is 0; 2) The oil fume sensor 52 detects the oil fume status; 3) If there is no obvious smoke escaping from the smoke intake, and no smoke escape, the smoke sensor 52 can hardly detect any smoke. The smoke concentration detected by the smoke sensor 52 can be set to 0 or below a certain concentration value, which is the vortex air intake state. If the smoke sensor 52 detects no smoke escape, maintain the current smoke intake state. If the smoke sensor 52 detects smoke escape, proceed to step 4). 4) Let n = n + 1, increase the speed of main fan 2 so that the adjusted speed V = V0 + n * V1, where V0 is the initial speed of main fan 2 and V1 is the unit value for adjusting the speed of main fan 2, which can have a simple proportional relationship with V0. 5) Detect again by the oil fume sensor 52 whether there is any oil fume escaping from the smoke intake. If yes, return to step 4); if no, proceed to step 6. 6) The sound sensor 53 detects the current noise S and determines whether S > Smax is true. Smax is the comfortable noise value that the human ear can tolerate. If it is true, proceed to step 7); otherwise, maintain the current smoking state. 7) Let V = V0 - n*V1, turn on the auxiliary fan 34, thereby using the auxiliary fan 34, in conjunction with the structure of the guide vane 34, to control the directional high-speed auxiliary airflow, guide the oil fume at the smoke inlet 13 (main air inlet 21) to form a steady vortex airflow, and achieve low-noise vortex smoke control.

[0058] Therefore, by using the fume sensor 52 and the sound sensor 53, the airflow status of the main air inlet 21 and the overall noise level of the machine are monitored, and the auxiliary airflow is dynamically adjusted to achieve the best smoke control effect with the minimum noise index.

[0059] See Figure 11 An alternative control method includes the following steps: 1) Power on, and the range hood will start working; 2) The oil fume sensor 52 detects the oil fume status; 3) If the oil fume is in a vortex intake state, with no obvious oil fume escaping from the annular intake and no smoke escape, and the oil fume sensor 52 can hardly detect any oil fume, the oil fume concentration detected by the oil fume sensor 52 can be set to 0 or below a certain concentration value to be in a vortex intake state; if the oil fume sensor 52 detects no smoke escape, proceed to step 4); if the oil fume sensor 52 detects smoke escape, turn on the auxiliary fan 34, and use the directional high-speed airflow of the auxiliary fan 34 to drive the oil fume airflow to present a vortex suction steady state motion, and return to step 2); 4) Wind speed sensor 51 detects the wind speed T at the main air inlet 21; 5) Determine if the relationship T≤Tmax holds true for the wind speed T at the main air inlet 21. Tmax is the maximum allowable wind speed at the main air inlet 21. If this value is exceeded, the excessively strong vortex effect will throw large oil droplets in the airflow onto the side panel or cooking countertop. If it does, it means that a stable vortex state is formed at the main air inlet 21, and efficient smoke control is achieved by using vortex technology. If not, reduce the speed of the auxiliary fan 34 and return to step 2.

[0060] Therefore, based on the real-time detection of the oil fume sensor 52 and the wind speed sensor 51, the fan speed is dynamically adjusted according to the oil fume escape status and the air inlet wind speed to achieve a stable vortex airflow state. By using vortex technology in conjunction with the main fan and the 360° annular air inlet, a better smoke control effect can be achieved.

[0061] 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 smart range hood, comprising: A smoke collection box (1) is provided with a smoke inlet (13) on the front side; as well as The air guide plate assembly (3) includes air guide plates, which are spaced apart on the front side of the smoke inlet (13), so that the oil fumes flow along the outer periphery of the air guide plates to the smoke inlet (13); Its features are: The air guide plate assembly (3) includes an auxiliary fan (34) that draws airflow into the air guide plate on the side of the air guide plate facing the smoke inlet (13). The back of the air guide plate facing the smoke collection box (1) is provided with guide vanes (33) that convert the airflow drawn in by the auxiliary fan (34) into vortex airflow and guide it toward the smoke inlet (13). There are multiple guide vanes (33) and they are spaced apart along the circumferential direction.

2. The intelligent range hood according to claim 1, characterized in that: Each airflow vane (33) is airfoil-shaped, and each airflow vane (33) has a first end (331) into which airflow blown by the auxiliary fan (34) enters and a second end (332) into which airflow is blown out, the second end (332) being open to form an air outlet (333).

3. The intelligent range hood according to claim 2, characterized in that: The back of the air guide plate is at least partially raised from the periphery towards the smoke collection box (1) to form a protrusion (321). The air guide vanes (33) are arranged on the outer periphery of the protrusion (321) and are interconnected. The first end (331) of each air guide vane (33) is located on the periphery of the protrusion (321), and the second end (332) of each air guide vane (33) is away from the protrusion (321). The auxiliary fan (34) is arranged inside the protrusion (321). The side of the protrusion (321) facing the smoke inlet (13) is provided with an auxiliary air inlet (322) for the airflow outside the air guide plate to enter the auxiliary fan (34).

4. The intelligent range hood according to claim 1, characterized in that: The range hood also includes a main fan (2) installed in the smoke collection box (1). The main fan (2) has a main air inlet (21) facing the front of the range hood. The smoke inlet (13) and the main air inlet (21) form a main smoke inlet channel.

5. The intelligent range hood according to claim 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 and a recessed platform (124) formed by the position corresponding to the opening (123) and recessed into the box body (11). The smoke inlet (13) is provided on the recessed platform (124).

6. The intelligent 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 smoke inlet (13) is opened on the bottom wall (1241).

7. The intelligent range hood according to claim 6, characterized in that: The bottom wall (1241) and / or the peripheral wall (1242) have a shape in which the diameter gradually decreases from the side of the opening (123) away from the opening (123).

8. The intelligent range hood according to claim 5, characterized in that: The panel assembly (12) further includes a panel (121) and a panel bracket (122) disposed on the side of the panel (121) facing the inside of the housing (11), the opening (123) is disposed on the panel (121), and the recess (124) is formed on the panel bracket (122).

9. The intelligent range hood according to any one of claims 4 to 8, 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 smoke inlet (13), and the rear end of the guide ring (15) is closely attached to the outer periphery of the first main air inlet (21), so that the first main air inlet (21) is only in fluid communication with the smoke inlet (13).

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

11. A control method for an intelligent range hood, comprising the intelligent range hood as described in any one of claims 4 to 10, characterized in that: The intelligent range hood also includes a sound sensor (53) for detecting noise transmitted from the smoke inlet (13) and an oil fume sensor (52) for detecting the oil fume airflow status around the air guide plate; The control method includes the following steps: 1) Power on, the range hood starts working, set the count value n of the number of times the main fan (2) speed is adjusted, the initial value of n is 0; 2) The oil fume sensor (52) detects the state of the oil fume; 3) If the fume sensor (52) detects no smoke escape, maintain the current smoke extraction state; if the fume sensor (52) detects smoke escape, proceed to step 4); 4) Let n=n+1, increase the speed of the main fan (2) so that the adjusted speed V=V0+n*V1, where V0 is the initial speed of the main fan (2) and V1 is the unit value for adjusting the speed of the main fan (2); 5) Use the fume sensor (52) again to check if there is any fume escaping from the smoke inlet. If yes, return to step 4); if no, proceed to step 5. 6) The sound sensor (53) detects the current noise S and determines whether S > Smax is true. Smax is the comfortable noise value that the human ear can tolerate. If it is true, proceed to step 7); otherwise, maintain the current smoking state. 7) Let V = V0 - n*V1, and turn on the auxiliary fan (34).

12. A control method for an intelligent range hood, comprising the intelligent range hood as described in any one of claims 4 to 10, characterized in that: The intelligent range hood also includes a wind speed sensor (51) for detecting the wind speed of the main air inlet (21) and an oil fume sensor (52) for detecting the oil fume airflow status around the air guide plate. The control method includes the following steps: 1) Power on, and the range hood will start working; 2) The oil fume sensor (52) detects the state of the oil fume; 3) If the fume sensor (52) detects no smoke escape, proceed to step 4). If the fume sensor (52) detects smoke escape, turn on the auxiliary fan (34) and use the directional high-speed airflow of the auxiliary fan (34) to drive the fume airflow to present a swirling suction steady state motion, and return to step 2). 4) The wind speed sensor (51) detects the wind speed T at the main air inlet (21); 5) Determine whether the relationship T≤Tmax holds true for the wind speed T at the main air inlet (21). Tmax is the maximum allowable wind speed at the main air inlet (21). If not, reduce the speed of the auxiliary fan (34) and return to step 2).

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