A smoke machine

Abstract

The application discloses a smoke machine, which comprises a rack, a fan and a cyclone device. The rack is provided with an air suction and exhaust passage and an air return passage. The fan forms an air suction and exhaust flow in the air suction and exhaust passage, which flows from an air inlet of the air suction and exhaust passage to a connecting position of the air suction and exhaust passage and the air return passage. At least part of the air suction and exhaust flow flows to the air return passage to form an air return flow. The cyclone device comprises a cyclone passage which is arranged around the air inlet of the air suction and exhaust passage and is communicated with the air return passage. The air return flow is output through the cyclone device. A rotating air curtain is formed around the air inlet, thereby realizing a tornado type smoke suction effect. The smoke machine has a good smoke suction effect without a large power, and the efficiency of sucking the tobacco tar is high. The rotating air curtain can gather the oil fume to prevent the oil fume from leaking out. The smoke machine has a simple and compact structure, occupies a small space and generates a small 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, and the oil fume in the kitchen is discharged 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 has found that the current range hood generally adopts a point-sink suction mode, and the suction and discharge effect is sharply reduced with the increase of the distance from the suction port, resulting in a small actual effective oil fume suction area. If the power of the range hood is increased to increase the suction air volume, the noise and power consumption will be increased, and a large amount of clean air will also be sucked, resulting in low efficiency of the oil fume suction. SUMMARY

[0004] The present application provides a range hood to solve the technical problem of low efficiency of the oil fume suction of the point-sink suction range hood 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, wherein a suction and discharge passage and a return air passage are arranged in the rack in communication, and an air inlet is arranged at one end of the suction and discharge passage away from the communication of the suction and discharge passage and the return air passage, for suction of oil fume;

[0007] A fan, for forming a suction and discharge airflow flowing from the air inlet of the suction and discharge passage to the communication of the suction and discharge passage and the return air passage in the suction and discharge passage, wherein at least a part of the suction and discharge airflow flows to the return air passage to form a return air airflow;

[0008] A cyclone, comprising a cyclone passage arranged around the air inlet of the suction and discharge passage, wherein the cyclone passage is in communication with the return air passage, the return air airflow is output through the cyclone, and a rotating air curtain is formed at the periphery of the air inlet.

[0009] In an embodiment, the cyclone comprises a first inner cylinder, a first outer cylinder, and a plurality of first guide vanes, wherein the first inner cylinder and the first outer cylinder are nested with each other and are spaced apart along a radial direction of the cyclone to form the cyclone passage therebetween, and the plurality of first guide vanes are disposed in the cyclone passage and are spaced apart along a circumferential direction of the first inner cylinder, a projection of the first guide vanes on the first inner cylinder and / or the first outer cylinder along the radial direction of the cyclone is obliquely arranged relative to an axis of the first inner cylinder and / or the first outer cylinder, so that the return air flow forms the rotating air curtain under the action of the first guide vanes.

[0010] In an embodiment, an oblique angle between the projection of the first guide vanes on the first inner cylinder and / or the first outer cylinder along the radial direction of the cyclone and the axis of the first inner cylinder and / or the first outer cylinder is 20° to 40°.

[0011] In an embodiment, the inner cylinder comprises a first guide section and a second guide section, the outer cylinder comprises a third guide section and a fourth guide section, the first guide section is nested in the third guide section, the second guide section is nested in the fourth guide section, and a generatrix of the first guide section and / or the third guide section is obliquely arranged relative to the axis of the inner cylinder, and a generatrix of the second guide section and / or the fourth guide section is parallelly arranged relative to the axis of the inner cylinder.

[0012] In an embodiment, the rack comprises an air suction duct and a mounting back plate, the air suction duct is used to form the suction and exhaust passage, the axis of the first inner cylinder and / or the first outer cylinder is obliquely arranged relative to an axis of the air suction duct and away from the mounting back plate, so that an air outlet of the cyclone passage faces away from the mounting back plate, and an included angle between the axis of the first inner cylinder and / or the first outer cylinder and the axis of the air suction duct is 0° to 45°.

[0013] In an embodiment, the rack comprises an air suction duct and a return air cylinder, the air suction duct is used to form the suction and exhaust passage, and the return air cylinder is sleeved on a periphery of the air suction duct and is used to form the return air passage, so that the return air passage is arranged around the suction and exhaust passage.

[0014] In an embodiment, the return air cylinder comprises a second inner cylinder and a second outer cylinder nested with each other, the air suction duct is disposed in the second inner cylinder and is spaced apart from the second inner cylinder along a radial direction of the return air cylinder, and the second outer cylinder is spaced apart from the second inner cylinder along the radial direction of the return air cylinder to form the return air passage therebetween.

[0015] In an embodiment, the return air duct further comprises a plurality of second vanes, the plurality of second vanes are arranged in the return air passage and are spaced along the circumference of the second inner cylinder body, each of the second vanes connects the second inner cylinder body and the second outer cylinder body along the radial direction of the return air duct, and a projection of the second vane on the second inner cylinder body and / or the second outer cylinder body along the radial direction of the return air duct is parallel to the axis of the second inner cylinder body and / or the second outer cylinder body.

[0016] In an embodiment, the number of the second vanes is 8-16, and the second vanes are evenly arranged along the circumference of the second inner cylinder body, and the thickness of the second vanes is 1.5-2.5 mm.

[0017] In an embodiment, the machine frame comprises a mounting back plate, the distance between the outlet of the cyclone passage along the axial direction of the cyclone and the mounting back plate is greater than the distance between the inlet of the suction and exhaust passage along the axial direction of the cyclone and the mounting back plate, and the height difference between the inlet of the suction and exhaust passage and the outlet of the cyclone passage along the axial direction of the cyclone is greater than or equal to 0.27 times the inner diameter of the inlet.

[0018] In an embodiment, the communication part of the suction and exhaust passage and the return air passage is provided with a smoke outlet, and the range hood further comprises a flow divider, the flow divider is arranged at the smoke outlet of the suction and exhaust passage, so that at least part of the suction and exhaust airflow is diverted to the return air passage, and the other part is discharged through the smoke outlet.

[0019] In an embodiment, the range hood further comprises a grille, the grille is arranged on the inlet of the suction and exhaust passage, and is used for rectifying the suction and exhaust airflow entering the suction and exhaust passage.

[0020] In an embodiment, the machine frame comprises a lower machine frame, the lower machine frame comprises at least two suction and exhaust pipes, the at least two suction and exhaust pipes are used to form first sub-suction and exhaust passages of the suction and exhaust passage respectively, the lower machine frame is provided with at least two openings, the inlets of the first sub-suction and exhaust passages are exposed through the corresponding openings, and the number of the cyclones is at least two, and at least two of the cyclones are arranged corresponding to the openings.

[0021] In an embodiment, the range hood further comprises an upper machine frame, the upper machine frame forms second sub-suction and exhaust passages of the suction and exhaust passage and the return air passage arranged side by side, and the fan is used to form a suction and exhaust airflow flowing from the inlet of the first sub-suction and exhaust passage to the second sub-suction and exhaust passage.

[0022] The smoke machine comprises a frame, a fan and a cyclone. The frame is provided with an air suction and exhaust passage and an air return passage. The fan forms an air suction and exhaust flow in the air suction and exhaust passage, which flows from an air inlet of the air suction and exhaust passage to a connecting position of the air suction and exhaust passage and the air return passage. At least part of the air suction and exhaust flow flows to the air return passage to form an air return flow. The cyclone comprises a cyclone passage arranged around the air inlet of the air suction and exhaust passage. The cyclone passage is communicated with the air return passage. The air return flow is output through the cyclone. A rotating air curtain is formed around the air inlet. The tornado smoke suction effect is realized. The smoke suction effect is good without high power. The smoke oil suction efficiency is high. The rotating air curtain can gather the oil fume to prevent the oil fume from leaking out. The structure is simple, compact, small in space occupation and low in noise. BRIEF DESCRIPTION OF DRAWINGS

[0023] 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. Other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0024] Figure 1 is a perspective structural schematic view of one embodiment of the smoke machine of the present application;

[0025] Figure 2 is a front view structural schematic view of one embodiment of the smoke machine of the present application;

[0026] Figure 3 is a side view structural schematic view of one embodiment of the smoke machine of the present application;

[0027] Figure 4 is Figure 2 is a sectional view structural schematic view of the smoke machine along the A-A direction in the smoke machine;

[0028] Figure 5 is a perspective and transparent structural schematic view of the cyclone in one embodiment of the smoke machine of the present application;

[0029] Figure 6 is a front view schematic view of part of the structure in one embodiment of the smoke machine of the present application;

[0030] Figure 7 is a perspective schematic view of part of the structure in one embodiment of the smoke machine of the present application;

[0031] Figure 8 is a perspective and transparent structural schematic view of the air return cylinder in one embodiment of the smoke machine of the present application;

[0032] Figure 9 is a sectional view structural schematic view of the air return cylinder in one embodiment of the smoke machine of the present application;

[0033] Figure 10 is a perspective view of part of the structure of an embodiment of the extractor hood of the application;

[0034] Figure 11 is a perspective view of part of the structure of an embodiment of the extractor hood of the application;

[0035] Figure 12 is a perspective view of part of the structure of an embodiment of the extractor hood of the application;

[0036] Figure 13 is a perspective view of part of the structure of an embodiment of the extractor hood of the application;

[0037] Figure 14 is a perspective view of part of the structure of an embodiment of the extractor hood of the application;

[0038] Figure 15 is a perspective view of part of the structure of an embodiment of the extractor hood of the application;

[0039] Figure 16 is a perspective view of part of the structure of an embodiment of the extractor hood of the application. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be apparently 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. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without any creative work, fall within the protection scope of the present application.

[0041] The terms "first", "second", etc. in the present application are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited. 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 includes steps or units not listed, or optionally includes other steps or units inherent to the process, method, product or device. And the term "and / or", is only a description of the association between the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of 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.

[0042] Reference is made to Figures 1 to 4The smoke machine 10 in the embodiment of the present application comprises a frame 100, a fan 200 and a cyclone 300. The frame 100 is provided with a communicating suction and exhaust passage 110 and a return air passage 120. The suction and exhaust passage 110 is provided with an air inlet at one end away from the communicating position of the suction and exhaust passage 110 and the return air passage 120, for suction of oil smoke. The fan 200 is used to form a suction and exhaust airflow in the suction and exhaust passage 110, which flows from the air inlet of the suction and exhaust passage 110 to the communicating position of the suction and exhaust passage 110 and the return air passage 120. At least part of the suction and exhaust airflow flows to the return air passage to form a return air airflow. The cyclone 300 comprises a cyclone passage 310 formed around the air inlet of the suction and exhaust passage 110. The cyclone passage 310 is in communication with the return air passage 120. The return air airflow is output through the cyclone 300 and forms a rotating air curtain around the air inlet, thereby achieving a tornado-like smoke suction effect. A large power is not required to achieve a good smoke suction effect. The efficiency of suction of oil smoke is high. The rotating air curtain can gather oil smoke to prevent leakage of oil smoke. The structure is simple, compact, occupies a small space and produces less noise.

[0043] In the embodiment, the fan 200 can be an axial fan. In other embodiments, the fan 200 can also be a centrifugal fan, etc., which is not limited herein.

[0044] Referring to Figure 5 In the embodiment, the cyclone 300 comprises a first inner cylinder 320, a first outer cylinder 330 and a plurality of first guide vanes 340. The first inner cylinder 320 and the first outer cylinder 330 are nested with each other and are spaced apart along the radial direction of the cyclone 300 to form the cyclone passage 310 between the first inner cylinder 320 and the first outer cylinder 330. The plurality of first guide vanes 340 are arranged in the cyclone passage 310 and are spaced apart along the circumferential direction of the first inner cylinder 320. The projection of the first guide vane 340 on the first inner cylinder 320 and / or the first outer cylinder 330 along the radial direction of the cyclone 300 is arranged obliquely to the axis of the first inner cylinder 320 and / or the first outer cylinder 330, so that the return air airflow forms a rotating air curtain under the action of the first guide vane 340, thereby achieving a tornado-like smoke suction effect.

[0045] In the embodiment, the oblique angle θ (as shown in Figure 5 ) between the projection of the first guide vane 340 on the first inner cylinder 320 and / or the first outer cylinder 330 along the radial direction of the cyclone 300 and the axis of the first inner cylinder 320 and / or the first outer cylinder 330 is 20° to 40°, for example, 20°, 29° or 40°, etc. The rotating air curtain can achieve better isolation effect and better tornado-like smoke suction effect, and the return air airflow is prevented from expanding outward too much to be dispersed.

[0046] In the embodiment, the number of the first guide vanes 340 can be 14 to 24, for example, 14, 21 or 24, etc., and are uniformly arranged along the circumference of the first inner cylinder 320, which can make the air volume of the rotating air curtain more balanced, the isolation effect better, and thus the smoking effect better.

[0047] Referring to Figure 6 In the embodiment, the distance between the air outlet of the cyclone passage 310 along the axial direction of the cyclone 300 and the installation back plate 101 is greater than the distance between the air inlet of the suction passage 110 along the axial direction of the cyclone 300 and the installation back plate 101, the height difference h between the air inlet of the suction passage 110 and the air outlet of the cyclone passage 310 along the axial direction of the cyclone 300 is greater than or equal to 0.27 times the inner diameter d of the air inlet, for example, h can be 0.27*d, 0.29*d or 0.30*d, etc., so that the cyclone wind type air flow can be formed by the cooperation of the cyclone passage 310 and the suction passage 110, and a better air suction effect can be achieved.

[0048] In the embodiment, the first inner cylinder 320 includes a first guide section 321 and a second guide section 322, and the first outer cylinder 330 includes a third guide section 331 and a fourth guide section 332, the first guide section 321 is nested in the third guide section 331, the second guide section 322 is nested in the fourth guide section 332, and the generatrix of the first guide section 321 and / or the third guide section 331 is arranged obliquely relative to the axis of the first inner cylinder 320, the angle β between the generatrix of the first guide section 321 and / or the third guide section 331 and the axis of the first inner cylinder 320 is 0° to 45°, for example, 5°, 26° or 45°, etc., which can expand the range of the return air flow output from the cyclone passage 310, and thus expand the air suction range, and the generatrix of the second guide section 322 and / or the fourth guide section 332 is arranged parallel to the axis of the first inner cylinder 320, which can avoid the return air flow output from the cyclone passage 310 being too diffused, and ensure the stability of the rotating air curtain formed at the periphery of the air inlet.

[0049] In the embodiment, the first guide vane 340 is arranged between the first guide section 321 and the third guide section 331, and the first guide vane 340 is close to the air inlet of the cyclone 300, which can better guide the air flow in the cyclone passage 310.

[0050] In other embodiments, a first guide vane (not shown in the figure) can also be arranged between the second guide section 322 and the fourth guide section 332, and the first guide vane is close to the air outlet of the cyclone passage 310, which can better guide the air flow output from the cyclone 300, and make the output air flow more stable.

[0051] In other embodiments, the first inner cylinder and the first outer cylinder can also be arranged in a circular truncated cone shape, and the generatrix of the first inner cylinder and the first outer cylinder is arranged obliquely relative to the axis of the first inner cylinder to expand the range of the output return air flow.

[0052] Referring to Figures 1 to 4 , Figure 7 In the present embodiment, the rack 100 comprises an air suction duct 130 for forming the suction-exhaust passage 110 and a return air cylinder 140 sleeved on the periphery of the air suction duct 130 and used for forming the return air passage 120, so that the return air passage 120 is arranged around the suction-exhaust passage 110, which can make the structure of the range hood 10 more compact and reduce the occupied space of the range hood 10.

[0053] In the present embodiment, the cyclone 300 is arranged at the bottom of the return air cylinder 140. In other embodiments, the cyclone 300 can also be arranged at the top or middle of the return air cylinder 140, which is not limited herein.

[0054] In the present embodiment, the axis of the first inner cylinder 320 and / or the first outer cylinder 330 is obliquely arranged relative to the axis of the air suction duct 130 in a direction away from the mounting back plate 101, so that the air outlet of the cyclone passage 310 faces away from the mounting back plate 101, and the included angle α (as shown in Figure 3 ) between the axis of the first inner cylinder 320 and / or the first outer cylinder 330 and the axis of the air suction duct 130 is 0° to 45°, for example, 0°, 23° or 45°, etc. By obliquely arranging the axis of the cyclone 300 relative to the axis of the air suction duct 130, the lateral air suction and lateral air return of the range hood 10 can be realized, which can reduce the interference of user operation on the rotating air curtain and make the suction effect of the range hood 10 better.

[0055] Referring to Figure 8 and Figure 9 In the present embodiment, the return air cylinder 140 comprises a second inner cylinder 141 and a second outer cylinder 142 nested with each other, the air suction duct 130 is arranged in the second inner cylinder 141 and is spaced apart from the second inner cylinder 141 along the radial direction of the return air cylinder 140, and the second outer cylinder 142 is spaced apart from the second inner cylinder 141 along the radial direction of the return air cylinder 140 to form the return air passage 120 between the second inner cylinder 141 and the second outer cylinder 142, which is used for making at least part of the suction-exhaust flow return to form the return air flow.

[0056] In the embodiment, the return air duct 140 further comprises a plurality of second guide vanes 143, which are arranged in the return air passage 120 and are spaced apart along the circumference of the second inner cylinder 141. Each second guide vane 143 connects the second inner cylinder 141 and the second outer cylinder 142 along the radial direction of the return air duct 140, and the projection of the second guide vane 143 on the second inner cylinder 141 and / or the second outer cylinder 142 along the radial direction of the return air duct 140 is arranged parallel to the axis of the second inner cylinder 141 and / or the second outer cylinder 142, so as to guide the return air flow to flow along the parallel direction of the axis of the second inner cylinder 141 and / or the second outer cylinder 142.

[0057] In the embodiment, the number of the second guide vanes 143 is 8-16, such as 8, 10 or 16, etc., which are uniformly arranged along the circumference of the second inner cylinder 141, so as to achieve a better guiding effect.

[0058] In the embodiment, the thickness of the second guide vane 143 is 1.5-2.5 mm, such as 1.5 mm, 2.1 mm or 2.5 mm, etc., which can neither cause a large blockage to the return air flow nor achieve a better guiding effect.

[0059] Referring back to Figures 1 to 4 In the embodiment, the communication part between the suction and exhaust passage 110 and the return air passage 120 is provided with an exhaust port, and the range hood 10 further comprises a flow divider 150 arranged at the exhaust port of the suction and exhaust passage 110, which is used to divide at least part of the suction and exhaust air flow to the return air passage 120, and the other part is exhausted through the exhaust port, so as to realize the recycling of the air flow without additional wind machine, and the structure is simpler.

[0060] In other embodiments, the range hood 10 further comprises a filter (not shown in the figure), which is arranged in the return air passage 120 and is used to filter and purify the return air flow in the return air passage 120, so as to avoid the oil fume from returning to the indoor space of the kitchen through the return air passage 120.

[0061] Referring back to Figure 10 In the embodiment, the range hood 10 further comprises a grille 160, which is arranged on the air inlet of the suction and exhaust passage 110 and is used to regulate the suction and exhaust air flow entering the suction and exhaust passage 110, so that the suction and exhaust air flow can flow into the suction and exhaust passage 110 along the axial direction, thereby improving the air suction efficiency.

[0062] Referring back to Figures 11 to 13The smoke machine 20 further includes a frame, a fan 700 and cyclones 500, the frame includes a lower frame 400 and an upper frame 600, the lower frame 400 includes at least two suction and exhaust pipes 440, the at least two suction and exhaust pipes 440 are used to form first sub-suction and exhaust passages (not shown in the figure) respectively, the lower frame 400 is provided with at least two openings (not marked in the figure), the air inlets of the first sub-suction and exhaust passages are exposed through the corresponding openings, the number of the cyclones 500 is at least two, and the at least two cyclones 500 are arranged correspondingly to the openings, the cyclones 500 are used to form cyclone passages 510 arranged around the air inlets of the first sub-suction and exhaust passages, the upper frame 600 forms second sub-suction and exhaust passages 610 and return air passages 620 arranged side by side, the fan 700 is used to form suction and exhaust air flows flowing from the air inlets of the first sub-suction and exhaust passages to the second sub-suction and exhaust passages 610, the return air passages 620 are communicated with the second sub-suction and exhaust passages 610 and the cyclone passages 510 respectively, at least part of the suction and exhaust air flows are divided into return air flows, output through the cyclones 500, and form rotating air curtains around the air inlets, thereby realizing the tornado smoke suction effect, at least two tornado suction air flows can be formed by the at least two cyclones 500, a better smoke suction effect can be realized without a large power, the efficiency of the smoke oil suction is higher, the rotating air curtains can gather the oil fume to prevent the oil fume from leaking out, the structure is simple and compact, the space occupied is small, and the noise generated is small.

[0063] In the embodiment, the lower frame 400 includes an outer cover 410, an inner cover 420 and a cover plate 430, the outer cover 410 is used to form a return air cavity 411, the inner cover 420 is arranged in the return air cavity 411 and is used to form a suction and exhaust cavity (not shown in the figure), the at least two suction and exhaust pipes 440 are connected with the inner cover 420, the first sub-suction and exhaust passages are communicated with the suction and exhaust cavity, the cover plate 430 is connected with the outer cover 410 to block the return air cavity 411, at least two openings are formed on the cover plate 430, the cyclone passages 510 are communicated with the return air cavity 411, and the return air flows in the return air cavity 411 are output through the cyclones 500.

[0064] In the embodiment, the second sub-suction and exhaust passages 610 are communicated with the suction and exhaust cavity, the return air passages 620 are communicated with the return air cavity 411, the return air flows flow into the return air cavity 411 through the return air passages 620, and then can be output through the cyclones 500 to realize the circulation of the air flow, and other fans do not need to be additionally increased, and the structure is more simple.

[0065] In the embodiment, the number of the suction and exhaust pipes 440 is two, and the two suction and exhaust pipes 440 are symmetrically arranged on opposite sides of the inner cover 420, so that the air flows of the air outlet and the air inlet of the smoke machine 20 are more balanced, the smoke suction efficiency is higher, the smoke suction effect is better, the structure of the smoke machine 20 is more compact, and the space occupied by the smoke machine 20 is reduced.

[0066] In the embodiment, the fan 700 can be a centrifugal fan. In other embodiments, the fan 700 can also be an axial fan or the like, which is not limited herein.

[0067] In the embodiment, the air flow is all shunted to the return air passage 620 for circulation. In other embodiments, the top of the upper rack 600 can also be formed with an air outlet hole (not shown in the figure) that communicates with the second sub-suction passage 610, for causing at least part of the air flow output from the air outlet of the second sub-suction passage 610 to flow to the outside.

[0068] In the embodiment, the shunting structure is formed directly through the upper rack 600. In other embodiments, a shunt (not shown in the figure) can also be separately provided to shunt the air flow, which is not limited herein.

[0069] In other embodiments, the range hood 20 can further include a filter (not shown in the figure) that is arranged in the return air passage 620, for filtering and purifying the return air flow in the return air passage 620, so as to avoid the oil fume from returning to the indoor space of the kitchen through the return air passage 620.

[0070] In the embodiment, the number of the return air passages 620 is two, and they are symmetrically arranged on opposite sides of the second sub-suction passage 610, so as to make the air flow and the return air flow more balanced, and the smoke suction efficiency and effect better, and to make the structure of the range hood 20 more compact and reduce the occupied space of the range hood 20.

[0071] Referring to Figure 14 , the cyclone 500 includes an inner cylinder 520, an outer cylinder 530, and a plurality of guide vanes 540, wherein the inner cylinder 520 and the outer cylinder 530 are nested with each other and are arranged at intervals along the radial direction of the cyclone 500 to form a cyclone passage 510 therebetween, and the plurality of guide vanes 540 are arranged at intervals along the circumferential direction of the inner cylinder 520 in the cyclone passage 510, and the projection of the guide vane 540 on the inner cylinder 520 and / or the outer cylinder 530 along the radial direction of the cyclone 500 is arranged obliquely to the axis of the inner cylinder 520 and / or the outer cylinder 530, so that the return air flow forms a rotating air curtain under the action of the guide vane 540, thereby realizing the tornado-like smoke suction effect.

[0072] In the embodiment, the oblique angle between the projection of the guide vane 540 on the inner cylinder 520 and / or the outer cylinder 530 along the radial direction of the cyclone 500 and the axis of the inner cylinder 520 and / or the outer cylinder 530 is 20° to 40°, for example, 20°, 29°, or 40°, etc., so that the rotating air curtain can achieve better isolation effect and better tornado-like smoke suction effect, and avoid the return air flow from expanding too much to cause the air flow to spread out.

[0073] In the embodiment, the number of the guide vanes 540 is 14 to 24, for example, 14, 21 or 24, etc., and is uniformly arranged along the circumference of the inner cylinder 520, which can make the air volume of the rotating air curtain more balanced, the isolation effect better, and the smoking effect better.

[0074] Referring to Figure 15 In the embodiment, the lower rack 400 further comprises a mounting back plate 401, the distance between the air outlet of the cyclone passage 510 and the mounting back plate 401 along the axial direction of the cyclone 500 is greater than the distance between the air inlet of the first sub suction passage and the mounting back plate 401 along the axial direction of the cyclone 500, the height difference H between the air inlet of the first sub suction passage and the air outlet of the cyclone passage 510 along the axial direction of the cyclone 500 is greater than or equal to 0.27 times the inner diameter D of the air inlet, for example, H can be 0.27*D, 0.29*D or 0.30*D, etc., so that the cyclone wind type air flow can be formed by the cooperation of the cyclone passage 510 and the first sub suction passage, and better air suction effect can be achieved.

[0075] In the embodiment, the generatrix of the inner cylinder 520 and / or the outer cylinder 530 is inclined to the axis of the inner cylinder 520 away from the mounting back plate 401, so that the air outlet of the cyclone passage 510 faces away from the mounting back plate 401, and the angle between the generatrix of the inner cylinder 520 and / or the outer cylinder 530 and the axis of the inner cylinder 520 can be 0° to 45°, for example, 5°, 24° or 45°, etc., which can expand the range of the return air flow output from the cyclone passage 510, and further expand the air suction range.

[0076] In other embodiments, the inner cylinder 520 and the outer cylinder 530 can also include two guide sections with the generatrix inclined to the axial direction of the inner cylinder 520 and parallel to the axial direction of the inner cylinder 520, for example Figure 6 Embodiments are described herein.

[0077] In the embodiment, the guide vane 540 is arranged close to the air inlet of the cyclone 500, which can better guide the air flow in the cyclone passage 510.

[0078] Referring to Figure 16 In other embodiments, the guide vane 830 of the cyclone 800 is arranged between the inner cylinder 810 and the outer cylinder 820, and close to the air outlet of the cyclone 800, which can better guide the air flow output from the cyclone 800, and make the output air flow more stable.

[0079] Referring to Figure 11 and Figure 12In the embodiment, the smoke machine 20 further comprises a grille 450, which is arranged on the air inlet of the first sub-exhaust passage and is used to regulate the flow of the exhaust air entering the first sub-exhaust passage, so that the exhaust air can flow into the first sub-exhaust passage along the axial direction, thereby improving the air suction efficiency.

[0080] 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 in that: include: A frame, wherein a suction and exhaust channel and a return air channel are connected to each other, and an air inlet is provided at one end of the suction and exhaust channel away from the connection point between the suction and exhaust channel and the return air channel for sucking in oil smoke; a fan for forming an intake and exhaust flow in the intake and exhaust channel, the flow flowing from an air inlet of the intake and exhaust channel to a connection point between the intake and exhaust channel and the return air channel, wherein at least a portion of the intake and exhaust flow flows to the return air channel to form a return air flow; A cyclone, the cyclone comprising a cyclone channel arranged around the air inlet of the suction and discharge channel, the cyclone channel being in communication with the return air channel, the return airflow being output through the cyclone and forming a rotating air curtain around the air inlet; The cyclone comprises a first inner cylinder and a first outer cylinder, wherein the first inner cylinder and the first outer cylinder are nested with each other and spaced apart along the radial direction of the cyclone to form the cyclone channel between the first inner cylinder and the first outer cylinder; wherein, the first inner cylinder includes a first guide section and a second guide section, and the first outer cylinder includes a third guide section and a fourth guide section, the first guide section is nested in the third guide section, the second guide section is nested in the fourth guide section, and the generatrix of the first guide section and / or the third guide section is arranged obliquely relative to the axis of the inner cylinder, and the generatrix of the second guide section and / or the fourth guide section is arranged parallel to the axis of the inner cylinder; wherein, the first guide section and the third guide section are arranged on a side close to the return air channel, and the second guide section and the fourth guide section are arranged on a side away from the return air channel and form an air outlet of the swirl channel; In which, the frame includes an air intake duct and a mounting backplate, the air intake duct is used to form the suction and exhaust channel, and the axis of the first inner cylinder and / or the first outer cylinder is inclined relative to the axis of the air intake duct in a direction away from the mounting backplate, so that the air outlet of the swirl channel is facing away from the mounting backplate.

2. The range hood according to claim 1, characterized in that: The swirler further includes a plurality of first guide vanes, which are disposed in the swirl channel and spaced apart along the circumference of the first inner cylinder. Projections of the first guide vanes on the first inner cylinder and / or the first outer cylinder in the radial direction of the swirler are inclined relative to the axis of the first inner cylinder and / or the first outer cylinder, so that the return airflow forms the rotating air curtain under the action of the first guide vanes.

3. The range hood according to claim 2, characterized in that: An inclination angle between a projection of the first guide vane on the first inner cylinder and / or the first outer cylinder along the radial direction of the cyclone and an axis of the first inner cylinder and / or the first outer cylinder is 20° to 40°.

4. The range hood according to claim 2, characterized in that: An included angle between an axis of the first inner cylinder and / or the first outer cylinder and an axis of the air intake duct is greater than 0° and less than or equal to 45°.

5. The range hood according to claim 1, characterized in that: The frame includes an air intake duct and a return air cylinder. The air intake duct is used to form the suction and exhaust channels. The return air cylinder is sleeved on the periphery of the air intake duct and is used to form the return air channel, so that the return air channel is arranged around the suction and exhaust channels.

6. The range hood according to claim 5, characterized in that: The return air cylinder includes a second inner cylinder and a second outer cylinder nested in each other, the intake duct is arranged in the second inner cylinder and is spaced apart from the second inner cylinder along the radial direction of the return air cylinder, and the second outer cylinder is spaced apart from the second inner cylinder along the radial direction of the return air cylinder to form the return air channel between the second inner cylinder and the second outer cylinder.

7. The range hood according to claim 6, characterized in that: The return air cylinder further includes a plurality of second guide vanes, which are arranged in the return air channel and spaced apart along the circumference of the second inner cylinder. Each second guide vane connects the second inner cylinder and the second outer cylinder along the radial direction of the return air cylinder. The projection of the second guide vane on the second inner cylinder and / or the second outer cylinder along the radial direction of the return air cylinder is arranged parallel to the axis of the second inner cylinder and / or the second outer cylinder.

8. The range hood according to claim 7, characterized in that: The number of the second guide plates is 8 to 16, and they are evenly arranged along the circumference of the second inner cylinder. The thickness of the second guide plates is 1.5 mm to 2.5 mm.

9. The range hood according to claim 1, characterized in that: The frame includes a mounting backplate, the distance between the air outlet of the swirl channel and the mounting backplate along the axial direction of the cyclone is greater than the distance between the air inlet of the suction and exhaust channel and the mounting backplate along the axial direction of the cyclone, and the height difference between the air inlet of the suction and exhaust channel and the air outlet of the swirl channel along the axial direction of the cyclone is greater than or equal to 0.27 times the inner diameter of the air inlet.

10. The range hood according to claim 1, characterized in that: A smoke exhaust port is provided at the connection point between the suction and exhaust channel and the return air channel. The range hood further includes a diverter, which is provided at the smoke exhaust port of the suction and exhaust channel, and is used to divert at least a portion of the suction and exhaust flow to the return air channel, and the other portion is discharged through the smoke exhaust port.

11. The range hood according to claim 1, characterized in that: The range hood further includes a grille, which is covered on the air inlet of the suction and exhaust channel and is used to rectify the suction and exhaust airflow entering the suction and exhaust channel.

12. The range hood according to claim 1, characterized in that: The frame includes a lower frame, and the lower frame includes at least two suction and exhaust pipes, and the at least two suction and exhaust pipes are used to respectively form first sub-suction and exhaust channels of the suction and exhaust channel. The lower frame is provided with at least two openings, and the air inlet of each first sub-suction and exhaust channel is exposed through the corresponding opening. The number of the cyclones is at least two, and the at least two cyclones are respectively provided corresponding to the openings.

13. The range hood according to claim 12, characterized in that: The range hood further includes an upper frame, which forms a second sub-suction and exhaust channel of the suction and exhaust channel and the return air channel arranged side by side, and the fan is used to form an intake and exhaust flow from the air inlet of the first sub-suction and exhaust channel to the second sub-suction and exhaust channel.

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