Range hood

Abstract

The utility model provides a kind of range hood, including the smoke collecting hood and fan system being communicated with each other, fan system includes main air inlet area and deputy air inlet area, the first air inlet is provided with in the smoke collecting hood corresponding main air inlet area, the second air inlet is provided with in the smoke collecting hood corresponding deputy air inlet area, still include ring suction plate, the ring suction plate is set corresponding the deputy air inlet area, the second air inlet includes the first through-hole being extended along the width direction of the smoke collecting hood and being set in the width direction opposite side of the ring suction plate, the second air inlet also includes the second through-hole being extended along the length direction of the smoke collecting hood and being set in the end of the ring suction plate away from the first air inlet, the first through-hole is communicated with the second through-hole and is enclosed in the outer circumferential side of the ring suction plate;The ring suction plate is inclinedly set relative to the top plate of the smoke collecting hood in the direction away from the top plate of the smoke collecting hood, the ring suction plate and the top plate of the smoke collecting hood are at the included angle α, and the included angle α is valued in the range of 5-15 °.

Description

Technical Field

[0001] This utility model specifically relates to a range hood. Background Technology

[0002] A range hood is an electrical appliance used to purify kitchen air. Based on its air inlet type, it can be divided into top-mounted, side-mounted, and top-and-side-mounted types. Top-mounted range hoods have their air inlet directly above the stove. These hoods are relatively deep, and the panel height is close to a person's forehead, posing a risk of head bumping. Side-mounted range hoods are located diagonally above the stove, with the air inlet closer to the stove. These hoods generally have an automatically opening and closing baffle to effectively collect smoke.

[0003] To meet the demands for flush-mounted or minimalist designs, the lower casing of existing side-draft range hoods is becoming increasingly thinner. Furthermore, to achieve better smoke extraction, the size of the baffle plate is constantly increasing, which can lead to limited cooking space and obstructed visibility. Secondly, when the instantaneous smoke volume is large, the rising speed of the fumes is also relatively high. After impacting the baffle plate, the fumes spread outwards, while the airflow velocity on the sides of the range hood is relatively low, resulting in less drag force on the fumes. Therefore, side-draft range hoods generally suffer from the problem of fumes escaping from the sides. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the existing technology where the baffle obstructs the view and affects the cooking experience, while the oil fumes on both sides of the baffle easily escape, and to provide a range hood.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A range hood includes a smoke collection hood and a fan system connected to each other. The fan system includes a main air intake zone and a secondary air intake zone. The smoke collection hood has a first air inlet corresponding to the main air intake zone and a second air inlet corresponding to the secondary air intake zone. The smoke collection hood also includes a ring suction plate, which is positioned corresponding to the secondary air intake zone. The second air inlet includes first through holes extending along the width direction of the smoke collection hood and located on opposite sides of the ring suction plate along the width direction. The second air inlet also includes a second through hole extending along the length direction of the smoke collection hood and located on the end of the ring suction plate away from the first air inlet. The first through holes and the second through holes communicate with each other and surround the outer periphery of the ring suction plate. The ring suction plate is inclined relative to the top plate of the smoke collection hood along a direction away from the top plate of the smoke collection hood, and the ring suction plate forms an angle α with the top plate of the smoke collection hood, the angle α being in the range of 5-15°.

[0007] In this design, a ring-shaped suction plate is used to form the second air inlet, which is surrounded by a first and a second through-hole. When faced with a large instantaneous smoke volume, both the first and second air inlets simultaneously absorb the fumes, reducing their spread and escape. The second air inlet, positioned around the outer perimeter of the ring-shaped suction plate, effectively draws in fumes flowing from both sides of the fume hood through the first through-hole, preventing their escape. Furthermore, the second through-hole can be used to collect smoke, eliminating the need for an outward-opening baffle to collect it, thus avoiding obstruction of the user's view and improving the user experience.

[0008] Preferably, the cross-section of the annular suction plate is a straight line. The first end of the annular suction plate is disposed close to the second through hole, and the second end of the annular suction plate is disposed away from the second through hole. Along the height direction of the smoke collection hood, the distance from the first end of the annular suction plate to the top plate of the smoke collection hood is D1, and the distance from the second end of the annular suction plate to the top plate of the smoke collection hood is D2, wherein D1 < D2, the value of D1 is in the range of 30-50mm, and the value of D2 is in the range of 50-80mm.

[0009] In this solution, the above settings are used to reduce the flow loss of airflow into the secondary air intake area through the second air intake, thereby ensuring the effectiveness of oil fume capture.

[0010] Preferably, the dimension of the annular suction plate projected onto the top plate of the smoke collection hood is P, and the value of P ranges from 80 to 120 mm.

[0011] In this scheme, the above settings are used to ensure that the airflow into the secondary air inlet area from the second through hole is sufficient.

[0012] Preferably, the first through hole is a trapezoidal hole.

[0013] In this solution, the trapezoidal holes, as described above, have a better adsorption effect on escaping fumes compared to rectangular holes.

[0014] Preferably, the first end of the trapezoidal hole has a dimension of M1, and the second end of the trapezoidal hole has a dimension of M2, wherein 20mm≤M1≤M2≤40mm.

[0015] In this solution, the above settings are used to limit the size of both ends of the trapezoidal hole to ensure the oil fume adsorption effect.

[0016] Preferably, the second through hole includes a rectangular hole and two trapezoidal holes, the two trapezoidal holes being located at both ends of the rectangular hole and communicating with each other.

[0017] In this solution, the above-mentioned settings are used to utilize the rectangular holes corresponding to the secondary air intake area, while the two trapezoidal holes are used to increase the smoke collection range, so that the second through hole has a better oil fume adsorption effect than the through rectangular hole.

[0018] Preferably, along the length of the smoke hood, the length of the trapezoidal hole is the same as the width of the fan frame of the fan system, and along the width of the smoke hood, the width of the trapezoidal hole is N1, and the end dimension of the trapezoidal hole away from the rectangular hole is N2, wherein 10mm≤N1≤N2≤20mm.

[0019] In this solution, the above settings are used to limit the size of both ends of the trapezoidal hole to ensure the smoke collection effect.

[0020] Preferably, the fume hood further includes an upper flap and a lower flap. The upper flap is hinged to the end of the annular suction plate opposite to the second through hole, and the lower flap is hinged to the outer edge of the first air inlet opposite to the second through hole and is disposed opposite to the upper flap. When the range hood is started, the upper flap flips and abuts against the top plate of the fume hood, forming an independent flow channel communicating with the first air inlet and an independent flow channel communicating with the second air inlet. The lower flap flips to the rear plate of the fume hood, and the lower flap is parallel to the upper flap. When the range hood is turned off, the upper flap and the lower flap abut against each other and close the first air inlet.

[0021] In this solution, the above-mentioned settings are used to form two independent flow channels using the upper and lower flaps, which prevents the oil fumes from being attracted by the main air intake area in the fume collection hood, thus reducing the flow rate of the secondary air intake area. The main air intake area and the secondary air intake area cooperate with each other to improve the oil fume adsorption efficiency.

[0022] Preferably, when the upper flap flips up to the top plate of the smoke hood and abuts against the top plate of the smoke hood, the upper flap and the top plate of the smoke hood form an angle θ, the angle θ is in the range of 30-50°, and the distance from the end of the upper flap that abuts against the top plate of the smoke hood to the rear plate of the smoke hood is Q, the value of Q is in the range of 80-120mm.

[0023] In this solution, by setting the above parameters to limit the angle of the upper flap and the distance between the upper flap and the rear flap after flipping, a better air intake state is obtained for the first air inlet.

[0024] Preferably, the fan frame of the fan system includes a volute, the main air inlet area is located between the volute and the rear plate of the fan frame, and the secondary air inlet area is located between the volute and the front plate of the fan frame. Along the width direction of the fan frame, the width of the main air inlet area is greater than the width of the secondary air inlet area. The width of the main air inlet area is X, and the value of X ranges from 100 to 140 mm. The width of the secondary air inlet area ranges from 40 to 0.5X mm.

[0025] In this solution, the above settings limit the width of the main air intake zone and the secondary air intake zone to match the flow rates of the first air intake and the second air intake, thereby achieving a stable and better oil fume capture effect.

[0026] The positive and progressive effects of this utility model are as follows: By setting up a ring suction plate, the second air inlet is formed by a first through hole and a second through hole surrounding the ring suction plate. When the instantaneous smoke volume is large, the first and second air inlets simultaneously absorb the oil fumes, reducing the diffusion and escape of the oil fumes. The second air inlet, which is arranged around the outer periphery of the ring suction plate, can effectively absorb the oil fumes flowing from both sides of the smoke collection hood through the first through hole, preventing the oil fumes from escaping from the sides of the smoke collection hood. Furthermore, the second through hole can be used to collect smoke, eliminating the need for a baffle that opens and closes outwards to collect smoke, avoiding obstruction of the user's view, and improving the user experience. Attached Figure Description

[0027] Figure 1 This is a perspective view of a range hood according to a preferred embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the structure of the second through hole in a preferred embodiment of the present invention.

[0029] Figure 3 This diagram shows the positional relationship between the trapezoidal hole and the rectangular hole in a preferred embodiment of the present invention.

[0030] Figure 4 This is a diagram showing the positional relationship between the annular suction plate and the upper flip plate in a preferred embodiment of the present invention.

[0031] Figure 5 This is a diagram showing the positional relationship between the main air intake area and the secondary air intake area in a preferred embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] Smoke hood 1

[0034] First air inlet 11

[0035] Second air inlet 12

[0036] First through hole 121

[0037] Second through hole 122

[0038] 13 ring suction plate

[0039] Top plate 14

[0040] Back panel 15

[0041] Upward flip panel 16

[0042] 17 Lower Flip Panel

[0043] Fan System 2

[0044] Main intake air zone 21

[0045] Secondary air intake area 22

[0046] 23 worm shell

[0047] Front panel 24 Detailed Implementation

[0048] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0049] This embodiment provides a range hood, the specific structure of which is as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 surround Figure 5 As shown, the range hood includes a smoke collection hood 1 and a fan system 2 connected to each other. The fan system 2 includes a main air intake zone 21 and a secondary air intake zone 22. The smoke collection hood 1 is provided with a first air inlet 11 corresponding to the main air intake zone 21, and a second air inlet 12 corresponding to the secondary air intake zone 22. The smoke collection hood 1 also includes a ring suction plate 13, which is provided corresponding to the secondary air intake zone 22. The second air inlet 12 includes sections extending along the width direction of the smoke collection hood 1 and located on opposite sides of the width direction of the ring suction plate 13. The first through hole 121 and the second air inlet 12 further include a second through hole 122 extending along the length of the smoke hood 1 and disposed at the end of the annular suction plate 13 away from the first air inlet 11. The first through hole 121 and the second through hole 122 are connected and surround the outer periphery of the annular suction plate 13. The annular suction plate 13 is inclined relative to the top plate 14 of the smoke hood 1 along the direction away from the top plate 14 of the smoke hood 1. The annular suction plate 13 and the top plate 14 of the smoke hood 1 form an angle α, and the value of the angle α is in the range of 5-15°.

[0050] Specifically, the first air inlet 11 is located on the smoke hood 1 and near the rear plate 15 of the smoke hood 1. The first air inlet 11 is connected to the main air inlet area 21, which is the internal space of the fan system 2 corresponding to the end of the fan system 2 with a large air inlet flow. Similarly, the second air inlet 12 is located on the smoke hood 1 and near the top plate 14, which corresponds to the top plate 14. The second air inlet 12 is connected to the secondary air inlet area 22, which corresponds to the internal space of the fan system 2 corresponding to the end of the fan system 2 with a small air inlet flow. The main air inlet area 21 and the secondary air inlet area 22 are both areas within the fan system 2 in the prior art. The connection between the first air inlet 11 and the main air inlet area 21 and the connection between the second air inlet 12 and the secondary air inlet area 22 are both prior art and will not be elaborated further here. In addition, a ring suction plate 13 is provided inside the smoke hood 1. The ring suction plate 13 is a flat plate and is located near the top plate 14. The second air inlet 12 is located between the outer edge of the ring suction plate 13 and the side wall of the smoke hood 1. That is, the second air inlet 12 is arranged around the outer periphery of the ring suction plate 13. The second air inlet 12 includes a first through hole 121 and a second through hole 122. The first through hole 121 is located on opposite sides in the width direction of the ring suction plate 13. The second through hole 122 is located at the end of the ring suction plate 13 away from the first air inlet 11. The first through hole 121 and the second through hole 122 are connected end to end to form a "U" shaped structure of the second air inlet 12 on the outer periphery of the ring suction plate 13. Compared to the rectangular air inlet extending along the length of the fume hood 1, the U-shaped second air inlet 12 allows for simultaneous absorption of fumes from both the first air inlet 11 and the second air inlet 12 when dealing with large instantaneous smoke volumes. This effectively draws in fumes flowing from both sides of the fume hood 1, preventing them from escaping. Furthermore, the second through-hole 122 can be used to collect smoke from different directions, directing it to the secondary air inlet area 22. This eliminates the need for outward-opening baffles to collect smoke, preventing obstruction of the user's view and improving the user experience.

[0051] Understandably, since the airflow rate of the secondary air intake zone 22 is less than that of the main air intake zone 21, in order to ensure that the annular suction plate 13 can guide the fumes and allow them to flow smoothly into the second air intake 12, in this embodiment, the annular suction plate 13 and the top plate 14 are not arranged parallel to each other. Instead, the annular suction plate 13 is inclined relative to the horizontal plane parallel to the top plate 14. The end of the annular suction plate 13 near the second air intake 12 coincides with the horizontal plane, while the end of the annular suction plate 13 away from the second air intake 12 is set away from the horizontal plane and forms an angle α with the horizontal plane. The value of the angle α is in the range of 5°≤α≤15°. By limiting the tilt angle of the annular suction plate 13, the efficiency of the second air intake 12 in capturing fumes is improved.

[0052] like Figure 4As shown, in this embodiment, the cross-section of the annular suction plate 13 is a straight line. The first end of the annular suction plate 13 is located close to the second through hole 122, and the second end of the annular suction plate 13 is located away from the second through hole 122. Along the height direction of the smoke collection hood 1, the distance between the first end of the annular suction plate 13 and the top plate 14 of the smoke collection hood 1 is D1, and the distance between the second end of the annular suction plate 13 and the top plate 14 of the smoke collection hood 1 is D2. Wherein, D1 < D2, the value range of D1 is 30-50mm, and the value range of D2 is 50-80mm.

[0053] Specifically, the first end of the ring suction plate 13 coincides with the horizontal plane parallel to the top plate 14, and the second end of the ring suction plate 13 is set away from the horizontal plane and away from the second through hole 122. When the stove generates oil fumes during cooking, the oil fumes rise along the height direction of the range hood and first come into contact with the second end of the ring suction plate 13. Then, the inclined ring suction plate 13 guides the oil fumes to the first end of the ring suction plate 13 and further adsorbs the oil fumes through the second through hole 122. In order to reduce the flow loss of the airflow flowing into the secondary air intake area 22 through the second air inlet 12, the distance between the first end of the ring suction plate 13 and the top plate 14 of the fume hood 1, and the distance between the second end of the ring suction plate 13 and the top plate 14 of the fume hood 1, i.e., the distances D1 and D2, are limited. This prevents excessive flow loss of oil fumes entering the fume hood 1 when the dimensions of D1 and D2 are large, thereby ensuring the oil fume capture effect.

[0054] Furthermore, the dimension of the annular suction plate 13 projected onto the top plate 14 of the fume hood 1 is P, and the value of P ranges from 80 to 120 mm. By limiting the dimension of the annular suction plate 13 projected onto the top plate 14 of the fume hood 1, the flow rate of the oil fumes guided by the annular suction plate 13 into the secondary air intake zone 22 through the second through hole 122 is ensured to be sufficient, preventing excessive flow loss of oil fumes due to the excessive dimension of the annular suction plate 13 projected onto the top plate 14 of the fume hood 1.

[0055] like Figure 2 and Figure 3 As shown, in this embodiment, the first through hole 121 is a trapezoidal hole. Compared with rectangular holes, trapezoidal holes can have a better adsorption effect on escaping fumes.

[0056] Furthermore, the first end of the trapezoidal hole has a dimension of M1, and the second end of the trapezoidal hole has a dimension of M2, wherein 20mm≤M1≤M2≤40mm.

[0057] Specifically, the second end of the trapezoidal hole is connected to the second through hole 122, the first end of the trapezoidal hole is away from the second through hole 122, the size of the second end of the trapezoidal hole is M2 and larger than the size of the first end of the trapezoidal hole is M1, 20mm≤M1≤M2≤40mm, the oil fume adsorption effect is ensured by limiting the size of the two ends of the trapezoidal hole.

[0058] In this embodiment, the second through hole 122 includes a rectangular hole and two trapezoidal holes, the two trapezoidal holes being located at both ends of the rectangular hole and communicating with each other.

[0059] Specifically, the rectangular hole corresponds to the secondary air intake area 22 of the fan system 2, and two trapezoidal holes are set at both ends of the rectangular hole. The first through hole 121 is connected end to end with the two trapezoidal holes at both ends of the rectangular hole, so as to use the two trapezoidal holes to increase the smoke collection range of the second through hole 122, making the oil fume adsorption effect of the second through hole 122 better than that of the long rectangular hole.

[0060] Furthermore, in this embodiment, along the length of the smoke hood 1, the length of the trapezoidal hole is the same as the width of the fan frame of the fan system 2. Along the width of the smoke hood 1, the width of the trapezoidal hole is N1, and the dimension of the end of the trapezoidal hole away from the rectangular hole is N2, wherein 10mm≤N1≤N2≤20mm. It can be understood that the larger end of the trapezoidal hole of the second through hole 122 is away from the rectangular hole, while the smaller end is connected to the rectangular hole. By limiting the dimensions of both ends of the trapezoidal hole of the second through hole 122, the smoke collection effect of the second through hole 122 is ensured.

[0061] In this embodiment, the fume hood 1 further includes an upper flap 16 and a lower flap 17. The upper flap 16 is hinged to the end of the annular suction plate 13 away from the second through hole 122. The lower flap 17 is hinged to the outer edge of the first air inlet 11 away from the second through hole 122 and is arranged opposite to the upper flap 16. When the range hood is started, the upper flap 16 flips and abuts against the top plate 14 of the fume hood 1, forming an independent flow channel communicating with the first air inlet 11 and an independent flow channel communicating with the second air inlet 12. The lower flap 17 flips to the rear plate 15 of the fume hood 1, and the lower flap 17 is parallel to the upper flap 16. When the range hood is turned off, the upper flap 16 and the lower flap 17 abut against each other and close the first air inlet 11.

[0062] Specifically, the lengths of the upper flap 16 and the lower flap 17 are the same as the length of the first air inlet 11. When the range hood is started, the upper flap 16 and the lower flap 17 flip up to separate the internal space of the fume hood 1 and form two independent flow channels. Simultaneously, the outer edge of the lower flap 17 away from the upper flap 16, the outer edge of the upper flap 16 away from the lower flap 17, and the side wall of the fume hood 1 enclose the first air inlet 11. The first air inlet 11 is connected to the independent flow channel leading to the main air inlet area 21, and the second air inlet 12 is connected to the independent flow channel leading to the secondary air inlet area 22. This is to prevent the fumes from being drawn into the main air inlet area 21 within the fume hood, thus reducing the flow rate in the secondary air inlet area 22. The main air inlet area 21 and the secondary air inlet area 22 cooperate to improve the fume adsorption efficiency.

[0063] It is understandable that both the upper flap 16 and the lower flap 17 are driven by servo motors in the prior art. The servo motors are electrically connected to the control board of the fan system so as to rotate the upper flap 16 and the lower flap 17 when the range hood is started or turned off.

[0064] like Figure 5 As shown, further, in this embodiment, when the upper flap 16 flips to the top plate 14 of the smoke hood 1 and abuts against the top plate 14 of the smoke hood 1, the upper flap 16 and the top plate 14 of the smoke hood 1 form an angle θ, the value of which is 30-50°, and the distance from the end of the upper flap 16 that abuts against the top plate 14 of the smoke hood 1 to the rear plate 15 of the smoke hood 1 is Q, the value of which is 80-120mm.

[0065] Specifically, when the range hood is started, the upper flap 16 flips towards the top plate 14, and the angle θ between the upper flap 16 and the top plate 14 ranges from 30° to 50°. In addition, when the upper flap 16 abuts against the top plate 14, the distance between the end of the upper flap 16 abutting against the top plate 14 and the rear plate 15 is Q, and the value of Q ranges from 80° to 120°. By limiting the angle of the upper flap 16 and the distance between the upper flap 16 and the rear plate 15 after flipping, the flipping of the upper flap 16 will not affect the flow of oil fumes in the first air inlet 11, thereby obtaining a better air intake state for the first air inlet 11.

[0066] In this embodiment, the fan frame of the fan system 2 includes a volute 23. The main air inlet area 21 is located between the volute 23 and the rear plate of the fan frame, and the secondary air inlet area 22 is located between the volute 23 and the front plate 24 of the fan frame. Along the width direction of the fan frame, the width of the main air inlet area 21 is greater than the width of the secondary air inlet area 22. The width of the main air inlet area 21 is X, and the value of X ranges from 100 to 140 mm. The width of the secondary air inlet area 22 ranges from 40 to 0.5X mm.

[0067] Specifically, the axial direction of the volute 23 is the same as the width direction of the fan frame of the fan system 2. The two air inlets of the volute 23 are located at the two ends of the axial direction and are spaced apart from the rear plate and the front plate 24 to form the main air inlet area 21 and the secondary air inlet area 22. By limiting the width of the main air inlet area 21 to be greater than the width of the secondary air inlet area 22, the flow rate of oil fume entering the main air inlet area 21 is increased. At the same time, since the air inlet flow rate of the volute 23 corresponding to the air inlet of the main air inlet area 21 is greater, the flow rates of the first air inlet 11 and the second air inlet 12 are matched by limiting the width of the main air inlet area 21 and the secondary air inlet area 22, so as to achieve a stable and better oil fume capture effect.

[0068] In this embodiment, the flow rate of the secondary air intake zone 22 is less than 0.5 times the flow rate of the main air intake zone 21.

[0069] Furthermore, in this embodiment, a grille filter is also provided in the independent flow area connected to the first air inlet 11 and the main air inlet zone 21, so as to filter the oil fumes and rectify the local airflow through the grille filter, thereby improving the user experience. The grille filter is a filter in the prior art, and will not be described in detail here.

[0070] In addition, the range hood in this embodiment can also be controlled by a voice module. A controller, a voice receiving module, and a voice parsing module, which are in the prior art, can be installed on the panel of the range hood's smoke collection hood 1 away from the rear panel 15. The voice receiving module receives the user's instructions, and the voice parsing module parses the instructions. According to the parsed instructions, the controller starts or stops the range hood accordingly, thereby realizing intelligent control of the range hood and improving the user experience.

[0071] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A range hood, comprising a smoke collection hood and a fan system connected to each other, the fan system comprising a main air intake zone and a secondary air intake zone, the smoke collection hood having a first air inlet corresponding to the main air intake zone, and the smoke collection hood having a second air inlet corresponding to the secondary air intake zone, characterized in that, The smoke hood further includes a ring suction plate, which is arranged corresponding to the secondary air inlet area. The second air inlet includes first through holes extending along the width direction of the smoke hood and disposed on opposite sides of the width direction of the ring suction plate. The second air inlet also includes a second through hole extending along the length direction of the smoke hood and disposed on the end of the ring suction plate away from the first air inlet. The first through hole and the second through hole communicate with each other and surround the outer periphery of the ring suction plate. The ring suction plate is inclined relative to the top plate of the smoke hood along the direction away from the top plate of the smoke hood. The ring suction plate and the top plate of the smoke hood form an angle α, and the value of the angle α is in the range of 5-15°.

2. The range hood as described in claim 1, characterized in that, The cross-section of the annular suction plate is a straight line. The first end of the annular suction plate is located close to the second through hole, and the second end of the annular suction plate is located away from the second through hole. Along the height direction of the smoke collection hood, the distance from the first end of the annular suction plate to the top plate of the smoke collection hood is D1, and the distance from the second end of the annular suction plate to the top plate of the smoke collection hood is D2, where D1 < D2, the value of D1 is in the range of 30-50mm, and the value of D2 is in the range of 50-80mm.

3. The range hood as described in claim 2, characterized in that, The dimension of the annular suction plate projected onto the top plate of the smoke collection hood is P, and the value of P ranges from 80 to 120 mm.

4. The range hood as described in claim 1, characterized in that, The first through hole is a trapezoidal hole.

5. The range hood as described in claim 4, characterized in that, The first end of the trapezoidal hole has a dimension of M1, and the second end of the trapezoidal hole has a dimension of M2, wherein 20mm≤M1≤M2≤40mm.

6. The range hood as described in claim 1, characterized in that, The second through hole includes a rectangular hole and two trapezoidal holes, the two trapezoidal holes being located at both ends of the rectangular hole and communicating with each other.

7. The range hood as described in claim 6, characterized in that, Along the length of the smoke hood, the length of the trapezoidal hole is the same as the width of the fan frame of the fan system. Along the width of the smoke hood, the width of the trapezoidal hole is N1, and the dimension of the end of the trapezoidal hole away from the rectangular hole is N2, wherein 10mm≤N1≤N2≤20mm.

8. The range hood as described in claim 1, characterized in that, The fume hood also includes an upper flap and a lower flap. The upper flap is hinged to the end of the annular suction plate away from the second through hole. The lower flap is hinged to the outer edge of the first air inlet away from the second through hole and is disposed opposite to the upper flap. When the range hood is started, the upper flap flips and abuts against the top plate of the fume hood, forming an independent flow channel communicating with the first air inlet and an independent flow channel communicating with the second air inlet. The lower flap flips to the rear plate of the fume hood, and the lower flap is parallel to the upper flap. When the range hood is turned off, the upper flap and the lower flap abut against each other and close the first air inlet.

9. The range hood as described in claim 8, characterized in that, When the upper flap flips over to the top plate of the smoke hood and abuts against the top plate of the smoke hood, the upper flap and the top plate of the smoke hood form an angle θ, the value of which is in the range of 30-50°, and the distance from the end of the upper flap that abuts against the top plate of the smoke hood to the rear plate of the smoke hood is Q, the value of which is in the range of 80-120mm.

10. The range hood as described in claim 1, characterized in that, The fan frame of the fan system includes a volute. The main air inlet area is located between the volute and the rear plate of the fan frame, and the secondary air inlet area is located between the volute and the front plate of the fan frame. Along the width direction of the fan frame, the width of the main air inlet area is greater than the width of the secondary air inlet area. The width of the main air inlet area is X, and the value of X ranges from 100 to 140 mm. The width of the secondary air inlet area ranges from 40 to 0.5X mm.

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