A smoke machine

Abstract

The application discloses a smoke machine, which comprises a rack, a first fan blade, a second fan blade and a cyclone device. The rack is provided with an air suction passage and an air outlet passage. The first fan blade forms an air suction flow in the air suction passage from an air inlet of the air suction passage. The second fan blade forms an air outlet flow in the air outlet passage from the air outlet of the air outlet passage. The cyclone device comprises a cyclone passage arranged around the air inlet of the air suction passage. The cyclone passage is communicated with the air outlet passage. The air outlet flow flows out through the cyclone device, and a rotating air curtain is formed around the air inlet of the air suction passage. The tornado type smoke suction effect is realized. The smoke machine has a good smoke suction effect without a large power. The efficiency of the smoke oil suction is high. The rotating air curtain can gather the oil fume to prevent the oil fume from leaking. The structure is simple, compact, small in space occupation and low in noise.

Description

TECHNICAL FIELD

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

[0002] The range hood is a main means for capturing indoor oil fume in the kitchen, which can discharge the oil fume in the kitchen to the outdoor through suction and discharge, so as to purify the air in the kitchen and provide a good cooking environment for the user.

[0003] The present application relates to the technical field of kitchen appliances, in particular to a range hood. SUMMARY

[0004] The present application provides a range hood to solve the technical problem of low efficiency of the range hood with point-sink suction in the prior art.

[0005] To solve the above technical problem, one technical solution of the present application is to provide a range hood, comprising:

[0006] A rack is provided with an air suction channel and an air outlet channel respectively, one end of the air suction channel is provided with an air inlet for suction of oil fume, and one end of the air outlet channel is provided with an air outlet;

[0007] A first fan blade is arranged in the air suction channel to form an air suction flow in the air suction channel from the air inlet of the air suction channel to the air suction channel;

[0008] A second fan blade is arranged in the air outlet channel to form an air outlet flow in the air outlet channel from the air outlet channel to the air outlet of the air outlet channel;

[0009] A cyclone device is arranged around the air inlet of the air suction channel, the cyclone channel is in communication with the air outlet channel, the air outlet flow passes through the cyclone device and forms a rotating air curtain around the air inlet of the air suction channel.

[0010] In one embodiment, the range hood further comprises a first motor arranged in the air suction channel for driving the second fan blade to rotate.

[0011] In one embodiment, the first fan blade is arranged close to the air inlet of the air suction channel and rotates under the driving of the first motor.

[0012] In an embodiment, the air outlet channel is arranged outside the air inlet channel, the second fan blade is arranged in the air outlet channel and outside the air inlet channel, the first fan blade is connected to the first motor, the second fan blade is coaxially arranged with the first fan blade and connected to the first fan blade, and the air inlet channel and the air outlet channel are arranged separately.

[0013] In an embodiment, the diameter of the first fan blade is smaller than the inner diameter of the air inlet of the air inlet channel.

[0014] In an embodiment, the range hood further comprises a third fan blade and a second motor, the third fan blade is arranged in the air inlet channel, and the second motor is configured to drive the third fan blade to rotate.

[0015] In an embodiment, the cyclone further comprises a guide pipe, the guide pipe is coaxially arranged with the air inlet of the air inlet channel and configured to guide external air of the range hood into the air inlet of the air inlet channel, the range hood further comprises a filter screen, the filter screen is arranged at an end of the guide pipe away from the air inlet channel, and the inner diameter of the guide pipe is greater than the inner diameter of the air inlet of the air inlet channel.

[0016] In an embodiment, the cyclone comprises an inner cylinder, an outer cylinder, and a plurality of guide vanes, the inner cylinder and the outer cylinder are nested with each other and arranged at intervals along the radial direction of the cyclone to form the cyclone channel between the inner cylinder and the outer cylinder, the plurality of guide vanes are arranged in the cyclone channel and at intervals along the circumferential direction of the inner cylinder, the guide vanes form a projection on the inner cylinder and / or the outer cylinder along the radial direction of the cyclone, the projection is arranged at an inclined angle with the axis of the inner cylinder and / or the outer cylinder, and the inclined angle is 30° to 60°.

[0017] In an embodiment, the machine frame comprises a mounting back plate, the cyclone further comprises a guide pipe, the distance between the air outlet of the cyclone channel and the mounting back plate along the axial direction of the cyclone is greater than the distance between the air inlet of the guide pipe and the mounting back plate along the axial direction of the cyclone, and the distance between the air inlet of the guide pipe and the air outlet of the cyclone channel along the axial direction of the cyclone is 50 mm to 150 mm.

[0018] In an embodiment, the ratio of the air volume discharged from the air outlet of the air outlet channel to the air volume entering the range hood from the air inlet of the air inlet channel is 0.3 to 0.8.

[0019] In a specific embodiment, the air suction passage, the air outlet passage, the cyclone and the second fan blade are two groups respectively, the rotating directions of the two groups of second fan blades are opposite, and the two groups of cyclones and the second fan blades are arranged such that the rotating directions of the rotating air curtains output by the two groups of cyclones are opposite.

[0020] The smoke machine comprises a frame, a first fan blade, a second fan blade and a cyclone. The frame is provided with an air suction passage and an air outlet passage. The first fan blade forms an air suction flow in the air suction passage flowing from an air inlet of the air suction passage into the air suction passage. The second fan blade forms an air outlet flow in the air outlet passage flowing from the air outlet passage to an air outlet of the air outlet passage. The cyclone comprises a cyclone passage arranged around the air inlet of the air suction passage. The cyclone passage is communicated with the air outlet passage. The air outlet flow flows out through the cyclone, so as to form a rotating air curtain around the air inlet of the air suction passage, thereby realizing a tornado smoke suction effect. The smoke machine has a simple and compact structure, occupies a small space and produces less noise. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0022] Figure 1 is a perspective structural schematic diagram of an embodiment of the smoke machine of the present application;

[0023] Figure 2 is a front view structural schematic diagram of an embodiment of the smoke machine of the present application;

[0024] Figure 3 is Figure 2 is a sectional view structural schematic diagram along the A-A direction;

[0025] Figure 4 is a perspective structural schematic diagram of the first fan blade and the second fan blade in an embodiment of the smoke machine of the present application;

[0026] Figure 5 is a top view structural schematic diagram of the first fan blade and the second fan blade in an embodiment of the smoke machine of the present application;

[0027] Figure 6 is a perspective structural schematic diagram of the cyclone in an embodiment of the smoke machine of the present application;

[0028] Figure 7is a perspective structural schematic view of a cyclone in an embodiment of the smoke machine of the present application;

[0029] Figure 8 is a sectional structural schematic view of part of the structure in an embodiment of the smoke machine of the present application;

[0030] Figure 9 is Figure 2 is a sectional structural schematic view along the direction of B-B;

[0031] Figure 10 is a perspective structural schematic view of another embodiment of the smoke machine of the present application;

[0032] Figure 11 is a front structural schematic view of another embodiment of the smoke machine of the present application;

[0033] Figure 12 is Figure 11 is a sectional structural schematic view along the direction of C-C;

[0034] Figure 13 is Figure 11 is a sectional structural schematic view along the direction of E-E;

[0035] Figure 14 is a perspective structural schematic view of a second fan blade in another embodiment of the smoke machine of the present application;

[0036] Figure 15 is a bottom structural schematic view of a second fan blade in another embodiment of the smoke machine of the present application. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0038] The terms "first", "second", etc. in the present application are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to the process, method, product or device. While the term "and / or", only describes the relationship between the associated objects, which means that there are three kinds of relationships, for example, A and / or B, which means that there are three kinds of cases, such as A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects have an "or" relationship.

[0039] Referring to Figures 1 to 3 , the smoke machine 10 includes a frame 100, a first fan blade 210, a second fan blade 220, and a cyclone 300. The frame 100 is provided with an air inlet for the suction of oil fume and an air outlet for the outlet of air. The first fan blade 210 is arranged in the air inlet to form an air flow in the air inlet. The second fan blade 220 is arranged in the air outlet to form an air flow in the air outlet. The cyclone 300 is arranged around the air inlet and is in communication with the air outlet. The air flow passes through the cyclone 300 and forms a rotating air curtain around the air inlet, thereby achieving a tornado effect. The machine has a simple and compact structure, occupies a small space, and produces less noise.

[0040] In the present embodiment, the frame 100 includes an upper frame 110 and a lower frame 120. The lower frame 120 is arranged to form the air outlet. The cyclone 300 is arranged corresponding to the opening. The upper frame 110 and the lower frame 120 jointly form the air inlet. The upper frame 110 is further provided with an air outlet 111. The air flow in the air inlet can be discharged through the air outlet 111. The lower frame 120 is further provided with an air inlet 121 for the air to enter the lower frame 120 to form the air flow.

[0041] In other embodiments, the suction air flow can also flow back to the air outlet channel 102 in the rack 100 and form the air outlet flow after being purified.

[0042] In the embodiment, the first fan blade 210 and the second fan blade 220 can be axial fan blades.

[0043] In the embodiment, the ratio of the air volume of the range hood 10 discharged from the air outlet of the air outlet channel 102 to the air volume of the range hood 10 entering from the air inlet of the air inlet channel 101 is 0.3 to 0.8, for example, 0.3, 0.5 or 0.8, etc., which can increase the oil fume suction effect in the case of small air volume of the suction air flow and improve the oil fume suction capacity of the range hood 10.

[0044] In the embodiment, the range hood 10 further comprises a first motor 230 arranged in the air inlet channel 101 for driving the second fan blade 220 to rotate, and the diameter D1 of the first motor 230 is less than or equal to 0.5 times the inner diameter D2 of the air inlet of the air inlet channel 101, for example, the diameter D1 of the first motor 230 can be 0.5 times, 0.3 times or 0.2 times the inner diameter D2 of the air inlet of the air inlet channel 101, etc., which can reduce the obstruction to the suction air flow in the air inlet channel 101, so that the oil fume suction effect of the range hood 10 is better.

[0045] In the embodiment, the first fan blade 210 is arranged close to the air inlet of the air inlet channel 101 and rotates under the drive of the first motor 230, and the first fan blade 210 and the second fan blade 220 are driven by the first motor 230 at the same time, which can make the structure of the range hood 10 more simple and compact, and better realize the synchronization of air suction and air outlet, and the cost is also reduced compared with using two motors to drive the first fan blade 210 and the second fan blade 220 respectively.

[0046] In the embodiment, the air outlet channel 102 is arranged on the periphery of the air inlet channel 101, the second fan blade 220 is arranged in the air outlet channel 102 and is sleeved on the air inlet channel 101, so that the air outlet flow is formed on the periphery of the suction air flow, the backflow formed by the air outlet flow can effectively increase the anti-back pressure capacity of the air inlet, further accelerate the speed of the suction air flow, so that the oil fume suction effect of the range hood 10 is better.

[0047] In combination with Figure 4 and Figure 5In the embodiment, the first fan blade 210 is connected with the first motor 230, and the second fan blade 220 is coaxially arranged with the first fan blade 210 and connected with each other, wherein the deflection directions of the first fan blade 210 and the second fan blade 220 are opposite, the first motor 230 can drive the second fan blade 220 through the first fan blade 210, so that the first fan blade 210 and the second fan blade 220 rotate in the same direction, thereby making the airflow directions generated by the first fan blade 210 and the second fan blade 220 opposite.

[0048] In the embodiment, the first motor 230 and the first fan blade 210 can be fixedly connected in a manner of interference fit, threaded connection or key groove connection.

[0049] In other embodiments, the second fan blade 220 can also be connected with the first motor 230 through a differential gear, wherein the deflection directions of the first fan blade 210 and the second fan blade 220 are the same, the first motor 230 drives the first fan blade 210 and the second fan blade 220 to rotate in opposite directions, thereby making the airflow directions generated by the first fan blade 210 and the second fan blade 220 opposite.

[0050] In the embodiment, the air suction channel 101 is isolatedly arranged with the air outlet channel 102. Specifically, the second fan blade 220 is rotationally sealed with the outer peripheral wall of the air suction channel 101, so as to isolate the air suction channel 101 from the air outlet channel 102. In the embodiment, the rack can further include an air suction pipe 130, the air suction pipe 130 forms the air suction channel 101, and the range hood 10 can further include a first sealing member 410, the first sealing member 410 is arranged between the second fan blade 220 and the outer peripheral wall of the air suction pipe 130, and can reduce the cross flow between the air suction flow in the air suction channel 101 and the air outlet flow in the air outlet channel 102, so as to make the air suction and air outlet effects better.

[0051] In the embodiment, the first sealing member 410 can be a brush. In other embodiments, the first sealing member 410 can also be a ball bearing or the like.

[0052] In other embodiments, a second sealing member (not shown in the figure) can also be arranged between the second fan blade 220 and the cyclone 300, which can further reduce the cross flow between the air suction flow in the air suction channel 101 and the air outlet flow in the air outlet channel 102, so as to make the air suction and air outlet effects better.

[0053] In the embodiment, the air suction pipe 130 is arranged in a smooth arc shape, which can guide the air suction flow more smoothly into the upper rack 110, reduce the resistance of the air suction pipe 130 to the air suction flow, and thereby further improve the effect of the range hood 10 on sucking oil fume.

[0054] In the embodiment, the diameter D3 of the first fan blade 210 is smaller than the inner diameter D2 of the air inlet of the air suction channel 101, so that most of the air flow generated by the first fan blade 210 can enter the air suction channel 101, reducing the possibility of air flow outflow, and avoiding the oil fume from being sprayed out through the air outlet of the air outlet channel 102.

[0055] In the embodiment, the difference between the diameter D3 of the first fan blade 210 and the inner diameter D2 of the air inlet of the air suction channel 101 is less than or equal to 10 mm, for example, 10 mm, 8 mm or 5 mm, etc., so that the first fan blade 210 can generate sufficient air flow to ensure the smoke extraction effect of the range hood 10.

[0056] In the embodiment, the cyclone 300 is further provided with a flow guide pipe 310 coaxially arranged with the air inlet of the air suction channel 101, for guiding the external air of the range hood 10 to enter the air inlet of the air suction channel 101. The range hood 10 further includes a filter screen 420 arranged at the end of the flow guide pipe 310 away from the air suction channel 101, for filtering the air entering the air suction channel 101 to achieve oil fume separation, which can improve the oil fume purification efficiency of the range hood 10.

[0057] In the embodiment, the filter screen 420 can be a single-layer metal screen or a composite of multiple layers of metal screens with different mesh sizes. Alternatively, the filter screen 420 can be made of a ventilated foam metal sheet, such as a foam nickel, a foam aluminum or a foam iron, etc., which can further improve the oil fume filtering effect.

[0058] In the embodiment, the filter screen 420 can be fixedly connected with the flow guide pipe 310 by buckling, screw connection or the like.

[0059] In the embodiment, the range hood 10 can further include a grille (not shown in the figure) arranged at the side of the filter screen 420 away from the air suction channel 101, which can have the effects of air straightening and oil fume separation on the air entering the air suction channel 101, so that the air flow can flow into the air suction channel 101 along the axial direction, improving the air suction efficiency, and reducing the influence of the oil fume on the structure in the air suction channel 101, further improving the oil fume purification efficiency of the range hood 10.

[0060] In the embodiment, the inner diameter D4 of the flow guide pipe 310 is greater than the inner diameter D2 of the air inlet of the air suction channel 101, and the difference between the inner diameter of the flow guide pipe 310 and the inner diameter of the air inlet of the air suction channel 101 is 10 mm to 20 mm, for example, 10 mm, 16 mm or 20 mm, which can increase the oil fume separation effect of the filter screen 420, and can make the air inlet area large enough, so that the air flow rate of the air flow is large enough to achieve good air suction effect, while the flow guide pipe 310 will not affect the main structure of the cyclone 300.

[0061] Referring to Figure 6 and Figure 7 In the embodiment, the cyclone 300 comprises an inner cylinder 320, an outer cylinder 330 and a plurality of guide vanes 340, the inner cylinder 320 and the outer cylinder 330 are nested with each other and are arranged along the radial direction of the cyclone 300 to form a cyclone passage 301 between the inner cylinder 320 and the outer cylinder 330, the plurality of guide vanes 340 are arranged in the cyclone passage 301 and are arranged along the circumferential direction of the inner cylinder 320, the projection of the guide vane 340 on the inner cylinder 320 and / or the outer cylinder 330 along the radial direction of the cyclone 300 is arranged at an inclined angle θ with respect to the axis of the inner cylinder 320 and / or the outer cylinder 330, so that the air flow forms a rotating air curtain under the action of the guide vane 340, thereby realizing the tornado smoke suction effect.

[0062] In the embodiment, the inner cylinder 320 and the outer cylinder 330 are arranged in a trumpet shape, which can expand the coverage range of the rotating air curtain, thereby expanding the air suction range of the range hood 10 and improving the smoke suction effect.

[0063] In the embodiment, the inclined angle θ between the projection of the guide vane 340 on the inner cylinder 320 and / or the outer cylinder 330 along the radial direction of the cyclone 300 and the axis of the inner cylinder 320 and / or the outer cylinder 330 is 30° to 60°, such as 30°, 42°, 57° or 60°, so that the rotating air curtain can achieve better isolation effect and better tornado smoke suction effect, and the air flow is prevented from expanding outwardly too much to be dispersed.

[0064] In the embodiment, the number of the guide vanes 340 can be 14 to 24, such as 14, 21 or 24, and the guide vanes 340 are uniformly arranged along the circumferential direction of the inner cylinder 320, which can make the air volume of the rotating air curtain more balanced, the isolation effect better, and the smoke suction effect of the range hood 10 better.

[0065] Referring to Figure 8 In the embodiment, the distance between the air outlet of the cyclone passage 301 along the axial direction of the cyclone 300 and the mounting back plate 112 is greater than the distance between the air inlet of the guide pipe 310 along the axial direction of the cyclone 300 and the mounting back plate 112, and the distance S between the air inlet of the guide pipe 310 and the air outlet of the cyclone passage 301 along the axial direction of the cyclone 300 is 50 mm to 150 mm, such as 50 mm, 88 mm, 119 mm or 150 mm, so that the return air of the rotating air curtain formed by the cyclone passage 301 can effectively increase the back pressure resistance of the air inlet of the guide pipe 310, further accelerate the speed of the air flow, and make the smoke suction effect of the range hood 10 better.

[0066] In the embodiment, the axis of the inner cylinder 320 and / or the outer cylinder 330 is arranged obliquely relative to the main surface of the mounting back plate 112, and the air outlet of the cyclone passage 301 faces away from the mounting back plate 112, so that the lateral air suction and the lateral air outlet of the range hood 10 can be realized, the interference of user operation on the rotating air curtain can be reduced, and the suction effect of the range hood 10 is better.

[0067] Referring to Figure 9 In the embodiment, the range hood 10 further includes a third fan blade 240 and a second motor 250, the third fan blade 240 is arranged in the air suction passage 101, and the second motor 250 is configured to drive the third fan blade 240 to rotate, so that the air flow rate and the air flow speed of the air flow sucked into the air suction passage 101 can be further increased, and the ability of the range hood 10 to suck the oil fume is better.

[0068] In the embodiment, the third fan blade 240 can be a centrifugal fan blade, the axial direction of the centrifugal fan blade is perpendicular to the flow direction of the air flow, and the centrifugal fan blade is less limited by the horizontal cross-sectional area of the machine frame 100, so that the centrifugal fan blade can adopt a fan blade with a larger size and a larger power, the larger flow passage resistance can be overcome, the air flow rate and the air flow speed of the air flow sucked into the air suction passage 101 can be further increased, and the ability of the range hood 10 to suck the oil fume is better.

[0069] In the embodiment, the number of the air suction passage 101, the air outlet passage 102, the cyclone 300 and the second fan blade 220 is two, the rotating directions of the two groups of second fan blades 220 are opposite, and the two groups of cyclones 300 and the second fan blades 220 are arranged such that the rotating directions of the rotating air curtains output by the two groups of cyclones 300 are opposite, so that the acting forces between the two rotating air curtains do not interfere with each other, and the two rotating air curtains can assist each other.

[0070] In the embodiment, the structures of the two groups of second fan blades 220 and the guide vanes 340 of the cyclone 300 can be mirror image arranged.

[0071] Referring to Figures 10 to 13 The range hood 20 embodiment of the present application includes a machine frame 500, a first fan blade 610, a second fan blade 620 and a cyclone 700, wherein the structures of the machine frame 500, the second fan blade 620 and the cyclone 700 are similar to those of the above-mentioned range hood 10 embodiment, and will not be described herein again.

[0072] The difference between the embodiment and the above-mentioned embodiments is that, in the embodiment, the first fan blade 610 is a centrifugal fan blade arranged in the air suction passage 501, and the air flow flowing into the air suction passage 501 from the air inlet of the air suction passage 501 can be formed.

[0073] Referring to Figure 14 and Figure 15In the embodiment, the smoke machine 20 further comprises a fan blade frame 621 and a filter screen 810. The second fan blade 620 is arranged on the outer circumferential wall of the fan blade frame 621. The fan blade frame 621 is formed with a ventilation passage communicating with the air suction passage 501. The filter screen 810 is arranged at one end of the fan blade frame 621 away from the air suction passage 501, and is used for filtering the air entering the air suction passage 501 to achieve oil fume separation, thereby improving the oil fume purification efficiency of the smoke machine 20.

[0074] In the embodiment, the smoke machine 20 further comprises a grid 820 arranged at one end of the flow guide pipe 710 of the cyclone 700 away from the air suction passage 501. The grid 820 can have the effects of air flow regulation and oil fume separation on the air entering the air suction passage 501, so that the air flow can flow into the air suction passage 501 along the axial direction, thereby improving the air suction efficiency and reducing the influence of the oil fume on the structure in the air suction passage 501, and further improving the oil fume purification efficiency of the smoke machine 20.

[0075] The above description is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is based on the content of the specification and drawings of the present application, is also included in the patent protection scope of the present application.

Claims

1. A range hood, characterized by, The smoke machine comprises a rack, an air inlet arranged at one end of the rack, a first fan blade, a second fan blade, a cyclone device, and a first motor. The first fan blade is arranged near the air inlet of the rack and rotates under the drive of the first motor. The second fan blade is arranged in the air outlet and is sleeved with the first fan blade. The diameter of the first fan blade is smaller than the inner diameter of the air inlet of the rack. The smoke machine further comprises a third fan blade and a second motor. The third fan blade is arranged in the air inlet. The smoke machine further comprises a filter screen arranged at the end of the guide pipe away from the air inlet. The cyclone device comprises an inner cylinder, an outer cylinder, and a plurality of guide vanes.

2. The range hood according to claim 1, wherein The inner cylinder and the outer cylinder are nested with each other and are arranged in the radial direction of the cyclone device to form the cyclone channel between the inner cylinder and the outer cylinder.

3. The range hood according to claim 2, wherein The plurality of guide vanes are arranged in the cyclone channel and are arranged in the circumferential direction of the inner cylinder.

4. The range hood according to claim 3, wherein The projection of the guide vane on the inner cylinder and / or the outer cylinder is arranged at an inclined angle with the axis of the inner cylinder and / or the outer cylinder, and the inclined angle is 30°-60°.

5. The range hood according to claim 3, wherein ​ 6. The range hood according to claim 3, wherein ​ 7. The range hood according to claim 1, wherein ​ 8. The range hood according to claim 1, wherein ​ 9. The range hood according to claim 1, wherein The ratio of the air volume discharged from the range hood by the air outlet of the air outlet passage to the air volume entering the range hood by the air inlet of the air inlet passage is 0.3 to 0.

8.

10. The range hood according to claim 1, wherein The number of the air inlet passage, the air outlet passage, the cyclone and the second fan blade is two groups respectively, the rotating directions of the two groups of second fan blades are opposite, and the two groups of cyclones and the second fan blades are arranged such that the rotating directions of the rotating air curtains output by the two groups of cyclones are opposite.

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