Range hood and control method thereof

Abstract

The present invention relates to a range hood and a control method thereof. The range hood comprises: a range hood body, an air curtain assembly and a smoke collecting assembly; the smoke collecting assembly comprises: a smoke collecting body arranged at the air outlet of the range hood body and a driving member for driving the smoke collecting body to rotate, the smoke collecting body being provided with a plurality of blades at intervals along its circumference; during the rotation of the smoke collecting body, the wind sent out by the air curtain air duct of the air curtain assembly passes through the gap between the blades. In the range hood as described above, the wind sent out by the air curtain air duct of the air curtain assembly can pass through the gap between two adjacent blades of the smoke collecting assembly, so that the blades can form the air outlet of the air curtain air duct into an upright hollow tube-shaped rotating airflow during the rotation process, thereby gathering the oil smoke to the smallest range, so that it can be quickly absorbed from the suction port of the range hood body, thereby achieving a more ideal oil smoke absorption effect.

Description

Technical Field

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

[0002] Range hoods are usually installed above the kitchen stove, mainly used to remove cooking fumes in the kitchen, thereby creating a healthy and comfortable living environment. At present, the range hoods on the market are generally equipped with air curtain structures, but during the cooking process, the volatilization of different oils, the flow of external airflow, and the high and low temperatures in the kitchen will affect the airflow of the air curtain structure, which may deviate or fail to exhaust smoke in a centralized manner, but instead bring about a diffusion effect. Summary of the invention

[0003] Based on this, the present invention aims at the problem that existing range hoods cannot exhaust smoke effectively, and provides a range hood and a control method thereof, which can gather the smoke to the smallest range so that it can be quickly absorbed from the smoke outlet of the range hood body, thereby achieving a more ideal smoke absorption effect.

[0004] A range hood, characterized in that it comprises: a range hood body, an air curtain assembly and a smoke collection assembly;

[0005] The smoke collecting assembly comprises: a smoke collecting body arranged at the air outlet of the range hood body and a driving member for driving the smoke collecting body to rotate, wherein the smoke collecting body is provided with a plurality of blades at intervals along its circumference;

[0006] During the rotation of the smoke collecting body, the wind sent out from the wind curtain air guide pipe of the wind curtain assembly passes through the gaps between the blades.

[0007] In one embodiment, the smoke collecting body comprises: a smoke collecting plate and a smoke collecting ring arranged around the smoke collecting plate, and the smoke collecting plate is rotatably connected to the driving member;

[0008] The blades are connected between the smoke collecting disc and the smoke collecting ring.

[0009] In one embodiment, the blade is a flat plate structure or an arc-shaped plate structure.

[0010] In one embodiment, the driving member is a motor, the output shaft of the motor is connected to the smoke collecting body, and the housing of the motor is connected to the range hood body.

[0011] In one of the embodiments, the air outlet of the air curtain air duct is a semicircular arc structure.

[0012] In one of the embodiments, the air outlet of the air curtain air duct is inclined toward the central axis of the range hood body.

[0013] In one embodiment, the range hood further comprises: a sensor for detecting the concentration of oil smoke, and the electric controller of the range hood body is electrically connected to the sensor and the fan of the range hood body;

[0014] The electronic controller adjusts the wind speed of the fan of the range hood main body according to the oil fume concentration transmitted by the sensor.

[0015] In one embodiment, the range hood further comprises: a sensor for detecting the concentration of oil smoke, and the electric controller of the range hood body is electrically connected to the sensor and the air curtain fan of the air curtain assembly;

[0016] The electronic controller adjusts the air supply volume of the air curtain air guide duct through the air curtain fan according to the oil smoke concentration transmitted by the sensor.

[0017] In one embodiment, the range hood further comprises: a sensor for detecting the concentration of oil smoke, and the electric controller of the range hood body is electrically connected to the sensor and the driving element;

[0018] The electronic controller adjusts the rotation speed of the smoke collecting body through the driving member according to the oil smoke concentration transmitted by the sensor.

[0019] In one embodiment, the sensor is arranged at the suction port of the range hood body.

[0020] In the range hood as described above, the wind sent out from the wind curtain air duct of the wind curtain assembly can pass through the gap between two adjacent blades of the smoke collecting assembly, so that the impeller can form the air outlet of the wind curtain air duct into an upright hollow tube-shaped rotating airflow during the rotation process, thereby gathering the oil smoke to the smallest range so that it can be quickly absorbed from the smoke intake port of the range hood body, thereby achieving a more ideal oil smoke suction effect.

[0021] A control method for a range hood as described in any one of the above, the control method comprising:

[0022] The oil fume concentration is obtained, and according to the oil fume concentration, the wind speed of the fan of the range hood main body, the air supply volume of the air curtain air guide duct of the air curtain assembly, and the rotation speed of the smoke collecting body of the smoke collecting assembly are adjusted.

[0023] The control method of the range hood as described above takes into account the influence of factors such as the type of cooking oil, the temperature of the pot, and the kitchen environment. The concentration of oil smoke generated is also different. The wind speed of the main variable frequency fan, the wind speed of the air curtain fan, and the speed of the smoke collection body can be controlled according to the size of the oil smoke, so as to achieve the effect of large smoke and wind, minimum noise, high efficiency and energy saving, and the best smoking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 An exploded view of a range hood provided in one embodiment of the present invention;

[0025] Figure 2 for Figure 1 A local enlarged schematic diagram at point A;

[0026] Figure 3 A partial cross-sectional view of a range hood provided by an embodiment of the present invention;

[0027] Figure 4 A cross-sectional view of a range hood provided by an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the structure of a sensor provided by an embodiment of the present invention;

[0029] Figure 6 A control flow logic diagram of a range hood provided in one embodiment of the present invention.

[0030] The reference numerals in the accompanying drawings are described as follows:

[0031] 100, range hood body; 110, outer shell; 111, upper shell; 112, base; 110a, smoke inlet; 110b, air outlet of range hood body; 120, fan; 200, air curtain assembly; 210, air curtain air duct; 220, air curtain fan; 300, smoke collection assembly; 310, smoke collection body; 311, smoke collection tray; 312, smoke collection ring; 320, driving part; 330, blade; 400, sensor; 410, detection probe; 420, GPRS concentrator. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0038] See also Figure 1 , Figure 1 FIG. 1 shows a schematic diagram of the structure of a range hood in an embodiment of the present invention. The range hood provided in an embodiment of the present invention comprises: a range hood body 100 (see FIG. 100 ). Figure 3 ), air curtain assembly 200 and smoke collection assembly 300; see Figure 2The smoke collecting assembly 300 includes: a smoke collecting body 310 disposed at the air outlet 110b of the range hood body 100 and a driving member 320 for driving the smoke collecting body 310 to rotate. The smoke collecting body 310 is provided with a plurality of blades 330 at intervals along its circumference. During the rotation of the smoke collecting body 310, the wind sent out by the wind curtain air duct 210 of the wind curtain assembly 200 passes through the gap between the two blades 330. It should be noted that when the smoke collecting body 310 rotates, the wind sent out by the wind curtain air duct 210 passes through the gap between the blades 330 that rotate to the bottom of its air outlet.

[0039] As an example, Figure 3 As shown, the range hood body 100 includes: a fan 120, a housing 110 and a main controller; the fan 120 includes: a volute, a volute tongue and a motor and an impeller all arranged on the volute; see Figure 1 The housing 110 includes an upper shell 111 for fixing the range hood and a base 112 connected to the upper shell 111, wherein the bottom wall of the base 112 is provided with an air outlet 110b and a suction port 110a located directly below the volute air outlet, and the side wall of the base 112 is provided with operation buttons (such as a fan switch button, an air volume adjustment button, etc.), and when the main controller detects the pressing operation of the operation button according to the operation, the working mode of the fan 120 of the range hood body is adjusted accordingly (such as a motor on mode, a motor off mode, a large air volume mode, a medium air volume mode, and a small air volume mode). The base 112 may be a cross-section of Figure 1 The rectangular structure shown may also be a shape in which the cross section is a combination of straight lines and arcs. In addition, the smoking port 110a may be an inverted cone-shaped structure protruding toward the outside of the base 112, or may be Figure 1 The structure of the multiple smoke-inhaling holes arranged at the bottom of the base 112 is shown. It should be noted that, in order to facilitate the description of the structure of the range hood, Figure 1 The range hood shown does not show the air curtain assembly 200 and the smoke trap assembly 300 located at the right side of the smoke intake port 110a.

[0040] As an example, Figure 2 As shown, the air curtain assembly 200 includes: an air curtain air duct 210 disposed at the air outlet 110b of the housing of the range hood body 100 and an air curtain fan for supplying air to the air curtain air duct 210, and the air curtain fan 220 can be installed on the base 112 of the housing 110 by means of screws or welding. Among them, one air curtain assembly 200 is disposed on each side of the smoking port 110a of the base 112, so that the oil smoke can be effectively blocked in all directions to prevent the oil smoke from spreading to the surroundings. Then, correspondingly, the number of smoke collection assemblies 300 is also 2, and each smoke collection assembly 300 corresponds to one air curtain assembly 200.

[0041] In the range hood as described above, the wind sent out by the wind curtain air duct 210 of the wind curtain assembly 200 can pass through the gap between two adjacent blades 330 of the smoke collecting assembly 300, so that the blades 330 can form the air outlet of the wind curtain air duct 210 into an upright hollow tube-shaped rotating airflow during the rotation process, thereby gathering the oil smoke to the smallest range so that it can be quickly absorbed from the suction port of the range hood body 100, thereby achieving a more ideal oil smoke suction effect.

[0042] In some embodiments of the present invention, Figure 2 As shown, the smoke collecting body 310 includes: a smoke collecting plate 311 and a smoke collecting ring 312 arranged around the smoke collecting plate 311, and the smoke collecting plate 311 is rotatably connected to the driving member 320; and the blades 330 are connected between the smoke collecting plate 311 and the smoke collecting ring 312. In this way, most of the air outlet of the wind curtain air duct 210 can pass through the gap between two adjacent blades 330 to avoid diffusion around, and the oil smoke can be effectively gathered. Among them, the blades 330 can be connected between the smoke collecting plate 311 and the smoke collecting ring 312 by welding or integrated molding. Of course, in some other embodiments, the smoke collecting body 310 may also only include a smoke collecting plate 311 rotatably connected to the driving member 320, and a side wall of the blade 330 is connected to the side wall of the smoke collecting plate 311.

[0043] In some embodiments of the present invention, the blade 330 is a flat plate structure or Figure 2 The arc-shaped plate structure shown. It should be noted that the blades 330 of the flat plate structure and the blades 330 of the arc-shaped plate structure are both inclined relative to the vertical direction. The blades 330 are evenly distributed along the circumference of the smoke-collecting body 310. The embodiment of the present invention does not specifically limit the number of blades 330. For example, Figure 2 The smoke collecting body 310 shown is provided with 76 of them.

[0044] In some embodiments of the present invention, Figure 2 As shown, the driving member 320 is a motor, the output shaft of the motor is connected to the smoke collecting body 310, and the housing of the motor is connected to the range hood body 100. The driving member 320 of this type of structure is simple in structure.

[0045] Regarding the connection between the output shaft of the motor and the smoke collecting body 310, the embodiment of the present invention provides two methods. In the first method, the first end of the output shaft of the motor away from the housing of the motor is provided with two first limiting planes that are relatively distributed; the smoke collecting body 310 is provided with a mounting hole, and two second limiting planes that are relatively distributed are provided in the mounting hole. The smoke collecting body 310 is sleeved on the first end of the output shaft of the motor through its own mounting hole, and the first limiting plane and the corresponding second limiting plane cooperate to limit the circumferential direction of the smoke collecting body 310; the first end of the output shaft of the motor is also provided with a limiting nut for axially limiting the smoke collecting body 310. In the second method, the smoke collecting body 310 is sleeved on the output shaft of the motor by means of interference fit. It can be understood that the smoke collecting body 310 is provided with an interference mounting hole. Among them, the interference mounting hole is adapted to the outer contour of the output shaft of the motor. For example, if the cross section of the output shaft of the motor is circular, the interference mounting hole is a circular hole with a smaller aperture than the diameter of the cross section of the output shaft of the motor.

[0046] Optionally, the motor housing is provided with an ear plate, which is mounted on the top wall of the housing base of the range hood body 100 by screws. There may be multiple ear plates, which are evenly distributed along the circumference of the motor housing. The ear plate may be arranged on the motor housing by welding or integrated molding.

[0047] Of course, in some other embodiments of the present invention, the driving member 320 may include: a cylinder and a connecting rod mechanism connected to the cylinder; the connecting rod mechanism is connected to the smoke collecting body 310. In application, the cylinder may be replaced by a hydraulic cylinder. It is understood that the connecting rod mechanism can convert linear operation into circular operation.

[0048] In some embodiments of the present invention, Figure 4 As shown, the air outlet of the air curtain air duct 210 is a semicircular arc structure. The air outlet of this structure can block the oil smoke of the pot from spreading outward to the greatest extent. Preferably, the inner diameter of the air outlet of the air curtain air duct 210 is the same as the inner diameter of the blade 330, and the outer diameter of the air outlet of the air curtain air duct 210 is the same as the outer diameter of the blade 330.

[0049] Optionally, the air curtain duct 210 is made of high temperature resistant plastic and is sealed to the range hood body 100 to prevent the air from flowing out of the air curtain duct 210 and improve the utilization rate of the air curtain duct 210. The air curtain duct 210 can be installed on the base 112 of the range hood body 100 by using sealant, or a seal (such as a rubber pad) is provided between the air curtain duct 210 and the base 112 of the range hood body 100.

[0050] In some embodiments of the present invention, the air outlet 110b of the air curtain air duct 210 is inclined toward the central axis of the range hood body 100. In this way, the cookware can be protected to the greatest extent from emitting smoke.

[0051] In some embodiments of the present invention, Figure 1 As shown, the range hood further includes: a sensor 400 for detecting the oil fume concentration, the sensor 400 is electrically connected to the electric controller of the range hood body 100; the electric controller is electrically connected to the fan 120 of the range hood body 100, the air curtain fan 220 of the air curtain assembly 200 and the driving member 320 of the smoke collecting assembly 300; the electric controller adjusts the wind speed of the fan 120 of the range hood body 100, adjusts the air supply volume of the air curtain air duct 210 through the air curtain fan 220, and adjusts the rotation speed of the smoke collecting body 310 through the driving member 320 according to the oil fume concentration transmitted by the sensor 400. The wind speed of the fan 120 of the range hood body 100, the air supply volume of the air curtain air duct 210 and the rotation speed of the smoke collecting body 310 can be automatically adjusted according to the oil fume concentration, and the oil fume in the kitchen can be flexibly controlled under different environments to ensure that the oil fume does not spread and gathers inward, and the energy-saving effect can also be achieved.

[0052] As an example, the sensor 400 is installed at the smoke outlet of the range hood body 100, and can accurately detect the smoke concentration. Figure 6 As shown, when the range hood is started, the variable frequency main motor inside the volute drives the centrifugal impeller to operate; when the oil smoke generated by cooking, the oil smoke first passes through the smoke inlet 110a on the range hood body 100, and then the detection probe 410 on the sensor 400 is used to detect the oil smoke concentration, and at the same time, the signal source is transmitted to the main controller of the range hood body 100, and the main controller controls the change of the air volume of the fan 120 of the range hood body 100, the change of the air supply volume of the wind curtain air duct 210 and the change of the rotation speed of the smoke collection body 310 respectively.

[0053] Alternatively, if Figure 5 As shown, the sensor 400 includes a detection probe 410 and a GPRS concentrator 420; wherein the detection probe 410 is 160 mm long and 14 mm in diameter, and a square notch with a length of 32 mm is provided at the front end of the detection probe 410, which is used to sense the concentration of oil smoke; a connection line conversion connector with a height of 16 mm is provided at the bottom end of the detection probe 410, and the conversion connector is connected to the GPRS concentrator 420 through wires, and the GPRS concentrator 420 is also connected to the main controller through wires, and the two form a series loop; the material of this detection probe 410 is stainless steel, which is not only moisture-proof, temperature-resistant and humidity-resistant, but also can work in an oil smoke environment of 800C for a long time, and its measurement accuracy can reach ±8%FS±0.5mg / m 3 The measurement range of oil smoke can reach 0mg / m 3-20mg / m 3 , and can also achieve long-term cleaning-free and maintenance-free effects.

[0054] In summary, in view of the unsatisfactory oil fume absorption of the range hoods on the market, especially when the oil and water come into contact at high temperature in the pot, the oil fume is the largest and most easily diffused, and it is not effective to smoke with a single smoking port. In this regard, the range hood provided by the embodiment of the present invention uses the self-rotation force of the smoke collecting body 310 to gather the oil fume to the smallest range, and the wind curtain air guide duct 210 of the wind curtain assembly 200 adopts an arc-shaped air outlet to protect the oil fume from spreading to the largest extent. At the same time, due to the influence of factors such as the type of edible oil, the temperature of the pot, and the kitchen environment, the concentration of the oil fume generated is also different. Therefore, a sensor 400 is added to detect the size of the oil fume. According to the size of the oil fume, the wind speed of the main variable frequency fan 120, the wind speed of the air curtain fan 220, and the rotation speed of the smoke collecting body 310 can be controlled, thereby achieving the effect of large smoke and wind, minimum noise, high efficiency and energy saving, and the best smoking effect.

[0055] Another embodiment of the present invention provides a control method for a range hood, the control method comprising:

[0056] The fume concentration is obtained, and according to the fume concentration, the wind speed of the fan 120 of the range hood main body 100, the air supply volume of the air curtain air duct 210 of the air curtain assembly 200, and the rotation speed of the smoke collecting body 310 of the smoke collecting assembly 300 are adjusted.

[0057] The control method of the range hood as described above takes into account the influence of factors such as the type of cooking oil, the temperature of the cookware, and the kitchen environment. The concentration of the generated oil smoke is also different. The wind speed of the main variable frequency fan 120, the wind speed of the air curtain fan 220, and the rotation speed of the smoke collection body 310 can be controlled according to the size of the oil smoke, so as to achieve the effect of large smoke and wind, minimum noise, high efficiency and energy saving, and the best smoking effect.

[0058] As an example, the sensor 400 can be used to detect the oil fume concentration, and the oil fume concentration can be transmitted to the electric controller of the range hood body 100. The electric controller adjusts the wind speed of the fan 120 of the range hood body 100 according to the oil fume concentration, adjusts the air supply volume of the air curtain air duct through the air curtain fan 220, and adjusts the rotation speed of the smoke collecting body 310 through the driving member 320. The electric controller of the range hood body 100 is electrically connected to the sensor 400, the driving member 320, the air curtain fan 220, and the fan 120 of the range hood body 100, respectively.

[0059] As an example, the sensor 400 is installed at the smoke outlet of the range hood body 100, and can accurately detect the smoke concentration. Figure 6As shown, when the range hood is started, the variable frequency main motor inside the volute drives the centrifugal impeller to operate; when the oil smoke generated by cooking, the oil smoke first passes through the smoke inlet on the range hood body 100, and then the detection probe 410 on the sensor 400 is used to detect the oil smoke concentration, and at the same time, the signal source is transmitted to the main controller of the range hood body 100, and the main controller controls the change of the air volume of the fan 120 of the range hood body 100, the change of the air supply volume of the wind curtain air duct and the change of the rotation speed of the smoke collection body 310 respectively.

[0060] Alternatively, if Figure 5 As shown, the sensor 400 includes a detection probe 410 and a GPRS concentrator 420; wherein the detection probe 410 is 160 mm long and 14 mm in diameter, and a square notch with a length of 32 mm is provided at the front end of the detection probe 410, which is used to sense the concentration of oil smoke; a connection line conversion connector with a height of 16 mm is provided at the bottom end of the detection probe 410, and the conversion connector is connected to the GPRS concentrator 420 through wires, and the GPRS concentrator 420 is also connected to the main controller through wires, and the two form a series loop; the material of this detection probe 410 is stainless steel, which is not only moisture-proof, temperature-resistant and humidity-resistant, but also can work in an 800C oil smoke environment for a long time, and its measurement accuracy can reach ±8% FS ± 0.5 mg / m 3 The measurement range of oil smoke can reach 0mg / m 3 -20mg / m 3 , and can also achieve long-term cleaning-free and maintenance-free effects.

[0061] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A range hood, characterized in that: include: A range hood main body (100), an air curtain assembly (200) and a smoke collection assembly (300); The smoke collecting component (300) comprises: a smoke collecting body (310) arranged at the air outlet (110b) of the range hood body (100) and a driving member (320) for driving the smoke collecting body (310) to rotate; the smoke collecting body (310) is provided with a plurality of blades (330) at intervals along its circumference; During the rotation of the smoke collecting body (310), the wind sent out from the wind curtain air guide pipe (210) of the wind curtain assembly (200) passes through the gaps between the blades (330); The range hood body (100) comprises a fan (120), a housing (110) and a main controller; the fan (120) comprises a volute, a volute tongue, and a motor and an impeller which are all arranged on the volute; the housing (110) comprises an upper housing (111) for fixing the range hood and a base (112) connected to the upper housing (111); the bottom wall of the base (112) comprises an air outlet (110b) and a suction port located directly below the air outlet of the volute. The air curtain assembly (200) is provided with one air curtain assembly (200) on each side of the smoke inlet (110a) of the base (112); the air curtain air guide duct (210) is provided at the air outlet (110b); the air curtain assembly (200) further comprises an air curtain fan (220) for supplying air to the air curtain air guide duct (210); and the air outlet of the air curtain air guide duct (210) is inclined toward the central axis of the range hood body (100).

2. The range hood according to claim 1, characterized in that: The smoke collecting body (310) comprises: a smoke collecting plate (311) and a smoke collecting ring (312) arranged around the smoke collecting plate (311); the smoke collecting plate (311) is rotatably connected to the driving member (320); The blades (330) are connected between the smoke collecting disc (311) and the smoke collecting ring (312).

3. The range hood according to claim 1, characterized in that: The blade (330) is a flat plate structure or an arc-shaped plate structure.

4. The range hood according to claim 1, characterized in that: The driving member (320) is a motor, the output shaft of the motor is connected to the smoke collecting body (310), and the housing of the motor is connected to the range hood body (100).

5. The range hood according to claim 1, characterized in that: The air outlet of the air curtain air guide duct (210) is a semicircular arc structure.

6. The range hood according to claim 1, characterized in that: The range hood further comprises: a sensor (400) for detecting the concentration of oil smoke, and the electric controller of the range hood body (100) is electrically connected to the sensor (400) and the fan (120) of the range hood body (100); The electric controller adjusts the wind speed of the fan (120) of the range hood main body (100) according to the oil fume concentration transmitted by the sensor (400).

7. The range hood according to claim 1, characterized in that: The range hood further comprises: a sensor (400) for detecting the concentration of oil smoke, and an electric controller of the range hood body (100) is electrically connected to the sensor (400) and the air curtain fan (220) of the air curtain assembly (200); The electric controller adjusts the air supply volume of the air curtain air guide duct (210) through the air curtain fan (220) according to the oil smoke concentration transmitted by the sensor (400).

8. The range hood according to claim 1, characterized in that: The range hood further comprises: a sensor (400) for detecting the concentration of oil smoke, and the electric controller of the range hood body (100) is electrically connected to the sensor (400) and the driving member (320); The electric controller adjusts the rotation speed of the smoke collecting body (310) through the driving member (320) according to the oil smoke concentration transmitted by the sensor (400).

9. The range hood according to any one of claims 6 to 8, characterized in that: The sensor (400) is arranged at the suction port (110a) of the range hood body (100).

10. A control method for a range hood according to any one of claims 1 to 9, characterized in that: The control method comprises: The oil fume concentration is obtained, and according to the oil fume concentration, the wind speed of the fan (120) of the range hood main body (100), the air supply volume of the air curtain air guide duct (210) of the air curtain assembly (200), and the rotation speed of the smoke collection body (310) of the smoke collection assembly (300) are adjusted.

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