Range hood

Abstract

The utility model discloses a range hood, which comprises a range hood main body, a range hood cover, a range hood cover and a range hood cover, the smoke exhaust fan is arranged in the smoke collecting cavity; the noise reduction and flow guide structure comprises a flow guide plate, a sound absorption part and a noise reduction plate, the flow guide plate is connected to the rear plate of the smoke collection cavity, the sound absorption part and the noise reduction plate are sequentially connected to the side, facing the rear plate of the smoke collection cavity, of the flow guide plate, micro-perforated holes are formed in the flow guide plate and the noise reduction plate, and a noise cavity is formed between the noise reduction plate and the rear plate of the smoke collection cavity; compared with the prior art, according to the range hood, due to the fact that the air inlet of the smoke exhaust fan faces the rear plate of the smoke collecting cavity, oil smoke entering the smoke collecting cavity obliquely flows backwards, is rebounded by the flow guide plate and flows towards the air inlet of the smoke exhaust fan after impacting the flow guide plate, and due to the fact that the sound absorption piece and the noise reduction plate are arranged on the rear side of the flow guide plate, the noise is reduced. When lampblack impacts on the flow guide plate, impact force is counteracted, noise in the lampblack collection cavity can be reduced, in addition, the noise reduction cavity can isolate the noise, and conduction of the noise in the lampblack collection cavity to the outside of the lampblack collection cavity is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, and in particular to a range hood. Background Art

[0002] In the prior art, the smoke exhaust fans of some range hoods are arranged in an air collecting box and tilted forward from top to bottom, with the air inlet of the smoke exhaust fan facing the back plate of the air collecting box. When the range hood is working, the smoke exhaust fan forms a negative pressure in the air collecting box. After the oil smoke enters the air collecting cavity through the air intake port connected to the air collecting box, it flows tilted backward from top to bottom and is discharged out of the air collecting box by the smoke exhaust fan. When the oil smoke enters the air collecting box, the flow velocity is relatively large. Under the action of inertia, a part of the oil smoke will directly impact the back plate of the air collecting box, causing a relatively large noise to be generated when the range hood is working. Utility Model Content

[0003] The purpose of the utility model is to provide a range hood, which is used to solve the above technical problems.

[0004] A range hood, comprising:

[0005] A range hood body, which has a smoke collecting chamber and an air suction port connected to the smoke collecting chamber;

[0006] A smoke exhaust fan is arranged in the smoke collecting chamber, and an air inlet of the smoke exhaust fan faces the rear plate of the smoke collecting chamber;

[0007] A noise reduction and guide structure includes a guide plate, a sound absorbing member and a noise reduction plate. The guide plate is connected to the rear plate of the smoke collecting chamber, and the side of the rear plate facing the smoke collecting chamber is connected with the sound absorbing member and the noise reduction plate in sequence. Micro-perforations are provided on the guide plate and the noise reduction plate. There is a gap between the noise reduction plate and the rear plate of the smoke collecting chamber, and the gap forms a noise reduction chamber.

[0008] According to one embodiment of the utility model, the part of the guide plate facing the air inlet of the smoke exhaust fan includes a vertical section and an inclined section, the inclined section is connected to the bottom of the vertical section, the inclined section is inclined backward from top to bottom, and the surface of the inclined section facing the air inlet of the smoke exhaust fan is a guide surface, the height of the upper edge of the guide plate is higher than the height of the upper edge of the air inlet of the smoke exhaust fan, and the height of the upper edge of the guide surface is lower than the height of the fan shaft of the smoke exhaust fan.

[0009] According to an embodiment of the present utility model, the sound absorbing member and the noise reduction plate are arranged corresponding to the vertical section of the guide plate, and the gap between the inclined section and the rear plate of the smoke collecting chamber also forms a part of the noise reduction chamber.

[0010] According to one embodiment of the utility model, the smoke exhaust fan is arranged to be tilted backward from bottom to top, and the angle between the guide surface and the front cover plate of the smoke exhaust fan is α1, 40°≤α1≤90°, and the angle between the guide surface and the rear plate of the smoke collecting chamber is α2, 25°≤α2≤50°.

[0011] According to one embodiment of the utility model, the intersection of the extended line of the axis of the fan shaft of the smoke exhaust fan and the surface where the portion of the guide plate facing the air inlet of the smoke exhaust fan is located is not lower than the height of the upper edge of the guide surface.

[0012] According to an embodiment of the present utility model, the position where the surface where the guide surface is located intersects with the surface where the air inlet of the smoke exhaust fan is located is not higher than the height of the upper edge of the air inlet of the smoke exhaust fan.

[0013] According to one embodiment of the present invention, the opening rate of the micro-perforations is 0.01 to 0.05, and the diameter of the micro-perforations is 1 mm to 3 mm.

[0014] According to one embodiment of the utility model, the sound absorbing component is sound absorbing cotton, the thickness of the sound absorbing cotton is 10mm to 30mm, the thickness of the noise reduction cavity is 10mm to 30mm, and the ratio of the thickness of the sound absorbing cotton to the thickness of the noise reduction cavity is 0.25 to 0.5.

[0015] According to one embodiment of the utility model, a low-frequency membrane is provided on the surface of the sound-absorbing cotton on the side close to the micro-perforations.

[0016] According to one embodiment of the utility model, the range hood body has a top plate, the air intake port is arranged on the top plate, the downward projection of the upper edge of the air inlet of the smoke exhaust fan is located on the rear side of the air intake port, and the downward projection of the center of the air inlet of the smoke exhaust fan is located on the front side of the air intake port; an oil leakage hole connected to the smoke collecting chamber is also provided on the top plate, and the oil leakage hole is located on the rear side of the air intake port.

[0017] Compared with the prior art, the range hood of the present invention has the following advantages:

[0018] The range hood of the utility model has an air inlet of the smoke exhaust fan toward the rear plate of the smoke collecting chamber, so the oil smoke entering the smoke collecting chamber flows obliquely backwards, and after the oil smoke hits the guide plate, it is rebounded by the guide plate and flows toward the air inlet of the smoke exhaust fan. Since the rear side of the guide plate is provided with a sound absorbing member and a noise reduction plate, when the oil smoke hits the guide plate, the impact force is offset, thereby reducing the noise in the smoke collecting chamber. In addition, a noise reduction chamber is provided between the noise reduction plate and the rear plate of the smoke collecting chamber, which can isolate noise, reduce the conduction of noise in the smoke collecting chamber to the outside of the smoke collecting chamber, and improve user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the range hood of the utility model;

[0020] Figure 2 for Figure 1 A magnified view of middle;

[0021] Figure 3 This is the flow diagram of the oil smoke after entering the smoke collecting chamber;

[0022] In the figure: 1. smoke machine body, 11. smoke collecting chamber, 12. air inlet, 13. oil leakage hole, 2. smoke exhaust fan, 3. noise reduction guide structure, 31. guide plate, 311. guide surface, 32. sound absorbing part, 33. noise reduction plate, 34. noise reduction chamber, 4. shielding structure, 41. shielding part

[0023] The realization of the functions and advantages of the utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0027] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0028] See also Figures 1 to 3The utility model discloses a range hood, which comprises a range hood body 1, a smoke exhaust fan 2 and a noise reduction guide structure 3. The range hood body 1 comprises a smoke collecting chamber 11 and an air intake port 12 connected to the smoke collecting chamber 11; the smoke exhaust fan 2 is arranged in the smoke collecting chamber 11, and the air inlet of the smoke exhaust fan 2 faces the rear plate of the smoke collecting chamber 11; the noise reduction guide structure 3 comprises a guide plate 31, a sound absorbing member 32 and a noise reduction plate 33. The guide plate 31 is connected to the rear plate of the smoke collecting chamber 11, and the side of the guide plate facing the rear plate of the smoke collecting chamber 11 is sequentially connected with the sound absorbing member 32 and the noise reduction plate 33. Micro-perforations are arranged on the guide plate 31 and the noise reduction plate 33. There is a gap between the noise reduction plate 33 and the rear plate of the smoke collecting chamber 11, and the gap forms a noise reduction chamber 34. In the range hood of the utility model, when the range hood is started, the smoke exhaust fan 2 runs, and the smoke exhaust fan 2 forms a negative pressure in the smoke collecting chamber 11. The oil smoke generated by the user's cooking enters the smoke collecting chamber 11 through the air inlet 12 and flows toward the air inlet of the smoke exhaust fan 2. Since the air inlet of the smoke exhaust fan 2 faces the rear plate of the smoke collecting chamber 11, the oil smoke entering the smoke collecting chamber 11 flows backwards at an angle. After the oil smoke hits the guide plate 31, it is rebounded by the guide plate 31 and flows toward the air inlet of the smoke exhaust fan 2. Since the rear side of the guide plate 31 is provided with a sound absorbing member 32 and a noise reduction plate 33, when the oil smoke hits the guide plate 31, the impact force is offset, which can reduce the noise in the smoke collecting chamber 11. In addition, there is a noise reduction chamber 34 between the noise reduction plate 33 and the rear plate of the smoke collecting chamber 11. The noise reduction chamber 34 can isolate noise, reduce the transmission of noise in the smoke collecting chamber 11 to the outside of the smoke collecting chamber 11, and improve user experience.

[0029] See also Figure 1 and Figure 3 In the range hood of the present invention, the part of the guide plate 31 facing the air inlet of the smoke exhaust fan 2 includes a vertical section and an inclined section, the inclined section is connected to the bottom of the vertical section, and the inclined section is arranged to be inclined backward from top to bottom, and the surface of the inclined section facing the air inlet of the smoke exhaust fan 2 is the guide surface 311, the height of the upper edge of the guide plate 31 is higher than the height of the upper edge of the air inlet of the smoke exhaust fan 2, and the height of the upper edge of the guide surface 311 is lower than the height of the fan shaft of the smoke exhaust fan 2. In the range hood of the present invention, a guide surface 311 is arranged on the inclined section of the guide plate 31, and the inclined section is arranged to be inclined backward from top to bottom, so that the guide surface 311 is arranged to be inclined from bottom to top toward the air inlet of the smoke exhaust fan 2. After the oil smoke contacts the guide surface 311, the guide surface 311 guides the oil smoke to the air inlet of the smoke exhaust fan 2, so that the oil smoke quickly enters the smoke exhaust fan 2 and is discharged. When the oil smoke impacts the guide plate 31, since the guide plate 31 is provided with micro-perforations on the surface of the guide plate 31 facing the air intake port of the smoke exhaust fan 2, the guide plate 31 and the rear plate of the smoke collecting chamber 11 are directly provided with a sound absorbing member 32, which can reduce the noise generated by the oil smoke entering the smoke collecting chamber 11 and impacting the rear plate of the smoke collecting chamber 11.

[0030] See also Figure 1 and Figure 3In the utility model range hood, the height of the upper edge of the guide surface 311 is lower than the height of the fan shaft of the smoke exhaust fan 2. After the oil smoke contacts the guide surface 311, it is pressed down by the guide surface 311 and guided to the air inlet of the smoke exhaust fan 2. The height of the upper edge of the guide surface 311 is lower than the height of the fan shaft of the smoke exhaust fan 2. The oil smoke guided by the guide surface 311 can enter the air inlet of the smoke exhaust fan 2 as much as possible, avoiding excessive oil smoke from flowing upward under the impact of the oil smoke newly entering the smoke collecting chamber 11 and flowing to the top of the air inlet of the smoke exhaust fan 2.

[0031] See also Figure 1 and Figure 3 In the utility model, the sound absorbing member 32 and the noise reduction plate 33 are arranged corresponding to the vertical section of the guide plate 31, and the gap between the inclined section and the rear plate of the smoke collecting chamber 11 also forms a part of the noise reduction chamber 34. There is also a cavity between the guide surface 311 and the rear plate of the smoke collecting chamber 11, which can isolate the noise generated when the oil smoke impacts the guide surface 311.

[0032] See also Figure 1 and Figure 3In the utility model, the smoke exhaust fan 2 is tilted backward from bottom to top, the angle between the guide surface 311 and the front cover of the smoke exhaust fan 2 is α1, 40°≤α1≤90°, and the angle between the guide surface 311 and the rear plate of the smoke collecting chamber 11 is α2, 25°≤α2≤50°. The smoke exhaust fan 2 is tilted, so that the air intake of the smoke exhaust fan 2 is closer to the air inlet 12, and the oil smoke entering the smoke collecting chamber 11 can be quickly discharged from the smoke collecting chamber 11, and the purification effect of the smoke exhaust fan is relatively high. The guide surface 311 is tilted toward the air inlet of the smoke exhaust fan 2, which can be used to quickly guide the oil smoke entering the smoke collecting chamber 11 into the air inlet of the smoke exhaust fan 2, so as to avoid the oil smoke entering the smoke collecting chamber 11 flowing too high in the smoke collecting chamber 11 under the impetus of the upstream airflow, thereby affecting the exhaust speed of the smoke by the smoke exhaust fan 2. However, if the angle between the guide surface 311 and the rear plate of the smoke collecting chamber 11 is too large, the angle between the guide surface 311 and the horizontal plane will be too small, and the distance between the guide surface and the air inlet 12 will be too small. After the oil smoke entering the smoke collecting chamber 11 contacts the guide surface 311, it will be pressed down very low by the guide surface 311, resulting in great wind resistance, which will affect the oil smoke outside the smoke collecting chamber 11 from entering the smoke collecting chamber 11, and affect the smoke exhaust fan 2's ability to extract oil smoke. If the angle between the guide surface 311 and the rear plate of the smoke collecting chamber 11 is too large, the guide surface 311 will not guide the oil smoke enough, and a large amount of oil smoke will go over the guide surface 311 and continue to flow upward, which will also affect the exhaust speed of the smoke exhaust fan 2. Therefore, in the following utility model, the angle α2 between the guide surface 311 and the rear plate of the smoke collecting chamber 11 satisfies 25°≤α2≤50°, so that the guide surface 311 can guide the oil smoke to the air inlet of the smoke exhaust fan 2, and the guide surface 311 will not cause excessive wind resistance to the oil smoke, affecting the oil smoke outside the smoke collecting chamber 311 to enter the smoke collecting chamber 11; and the guide surface 311 will not insufficiently guide the oil smoke, causing excessive oil smoke to rise above the air inlet of the smoke exhaust fan 2, affecting the smoke exhaust fan 2 to discharge the oil smoke in time.

[0033] Similarly, the guide surface 31 is tilted, and the smoke exhaust fan 2 is tilted. If the angle α between the guide surface 311 and the front cover of the smoke exhaust fan 2 is too small, it will produce a large wind resistance to the oil smoke entering the smoke collecting chamber 11, affecting the oil smoke outside the smoke collecting chamber 11 to enter the smoke collecting chamber 11, and affecting the smoke extraction effect of the smoke exhaust fan 2 on the oil smoke. Therefore, the smoke exhaust fan of the utility model makes the angle α1 between the guide surface 311 and the front cover of the smoke exhaust fan 2 meet 40°≤α1≤90°, which will not produce too large wind resistance to the oil smoke entering the smoke collecting chamber 11, and will not affect the oil smoke outside the smoke collecting chamber 11 to enter the smoke collecting chamber 11.

[0034] See also Figure 1 and Figure 3In the range hood of the present invention, the intersection of the extended line of the axis of the fan shaft of the smoke exhaust fan 2 and the surface where the portion of the guide plate 31 facing the air inlet of the smoke exhaust fan 2 is located is not lower than the height of the upper edge of the guide surface 311. The portion of the guide plate 31 facing the smoke exhaust fan 2 includes an inclined section and a vertical section. The surface where the inclined section is located is the guide surface 311, and the surface where the vertical section is located is the extension surface. The guide surface 311 has different inclination angles and different upper edge heights. As mentioned above, the inclination angle of the guide plate 31 affects the oil smoke suction effect of the smoke exhaust fan 2 outside the smoke collecting chamber 11, and also affects the oil smoke discharge effect of the smoke exhaust fan 2 on the smoke collecting chamber 11. In the range hood of the present invention, the intersection of the extended line of the axis of the fan shaft of the smoke exhaust fan 2 and the surface where the portion of the guide plate 31 facing the air inlet of the smoke exhaust fan 2 is located is not lower than the height of the upper edge of the guide surface 311. That is to say, the angle α2 between the guide surface 311 and the rear plate of the smoke collecting chamber 11 satisfies 25°≤α2≤50°, and the upper edge of the guide surface 311 is not higher than the height of the intersection of the extension line of the axis of the fan shaft of the smoke exhaust fan 2 and the surface where the part of the guide plate 31 facing the air inlet of the smoke exhaust fan 2 is located.

[0035] The micro-perforation of the utility model has an opening rate of 0.01 to 0.05 and a diameter of 1 to 3 mm. When the smoke enters the smoke collecting chamber 11 under the action of the smoke exhaust fan 2 and contacts the guide plate 31, the micro-perforation can reduce the noise generated when the smoke impacts the guide plate 31.

[0036] In the utility model range hood, the sound absorbing member 32 is sound absorbing cotton, the thickness of the sound absorbing cotton is 10mm to 30mm, the thickness of the noise reduction chamber 34 is 10mm to 30mm, and the ratio of the thickness of the sound absorbing cotton to the thickness of the noise reduction chamber 34 is 0.25 to 0.5. The sound absorbing cotton has a sufficiently good noise reduction effect, and the noise reduction chamber 34 has a good noise isolation effect.

[0037] In the utility model, a low-frequency membrane is arranged on the surface of the side of the sound-absorbing cotton near the micro-perforations. After the oil smoke enters the smoke collecting chamber 11 and impacts the guide surface 311, it will flow to the rear side of the guide surface 311 through the micro-perforations. The oil smoke contains a mixture of oil and water. The low-frequency membrane is arranged on the surface of the side of the sound-absorbing cotton facing the micro-perforations. The low-frequency membrane can absorb low-frequency noise and has an oil-repelling effect, preventing oil from entering the interior of the sound-absorbing cotton and reducing the noise reduction effect of the sound-absorbing cotton.

[0038] See also Figures 1 to 3In the utility model, the hood body 1 has a top plate, and the air inlet 12 is arranged on the top plate. The downward projection of the upper edge of the air inlet of the smoke exhaust fan 2 is located at the rear side of the air inlet 12. The width of the air inlet 12 is determined. When the width of the air inlet 12 is fixed, if the air inlet 12 is closer to the lower edge of the air inlet of the smoke exhaust fan 2, when the oil smoke enters the smoke collecting chamber 11, the oil smoke will directly hit the front cover of the smoke exhaust fan 2, and the resistance of the front cover of the smoke exhaust fan 2 to the oil smoke will be greater, which will affect the flow of the oil smoke into the smoke collecting chamber 11; and if the air inlet 12 is farther away from the lower edge of the smoke exhaust fan 2, when the oil smoke enters the smoke collecting chamber 11, it will impact the smoke exhaust fan 2. The smaller the amount of oil smoke on the front cover of the smoke exhaust fan 2, the smaller the resistance to the oil smoke. However, when the air inlet 12 is too far away from the lower edge of the air inlet of the smoke exhaust fan 2, the projection of the upper edge of the air inlet of the smoke exhaust fan 2 falls into the air inlet 12 or falls to the front side of the air inlet 12. After the oil smoke enters the smoke collecting chamber 11, a large amount of oil smoke will continue to flow upward under the action of inertia and pass through the air inlet of the smoke exhaust fan 2, affecting the speed at which the smoke exhaust fan 2 discharges the oil smoke. Therefore, in the smoke exhauster of the utility model, the downward projection of the upper edge of the air inlet of the smoke exhaust fan 2 is located at the rear side of the air inlet 12, which neither makes the wind resistance too large when the oil smoke enters the smoke collecting chamber 11, affecting the smoke exhaust fan 2's suction effect on the oil smoke outside the smoke collecting chamber 11, nor prevents a large amount of oil smoke from passing through the air inlet of the smoke exhaust fan 2 and flowing upward, affecting the smoke exhaust fan 2's discharge effect on the oil smoke in the smoke collecting chamber 11.

[0039] See also Figures 1 to 3 In the utility model range hood, an oil leakage hole 13 connected to the smoke collecting chamber 11 is also provided on the top plate, and the oil leakage hole 13 is located at the rear side of the air suction port 12. After the range hood has been running for a period of time, a large amount of oil liquid formed by a mixture of oil and water will accumulate on the wall surface of the smoke collecting chamber 11, the volute of the smoke exhaust fan 2 and the guide plate 31. These oil liquids gather at the bottom of the smoke collecting chamber 11 and are discharged from the smoke collecting chamber 11 through the oil leakage hole 13. In the utility model range hood, the air suction port 12 and the oil leakage hole 13 are arranged on the top plate of the range hood body 1. The range hood belongs to a top suction type range hood. When the smoke exhaust fan 2 is running, the oil smoke rises to the top plate of the range hood body 1 and enters the smoke collecting chamber 11 through the air suction port 12. The oil leakage hole 13 is arranged at the rear side of the air suction port 12. When an oil cup is hung below the oil leakage hole 13, the oil cup will not affect the oil smoke entering through the air suction port 12.

[0040] See also Figures 1 to 3In the utility model range hood, a shielding structure 4 is provided in the smoke collecting chamber 11, and the shielding structure 4 has at least a shielding portion 41 aligned with the oil leakage hole 13, the shielding portion 41 shields the oil leakage hole 13, the length of the shielding portion 41 in the front-to-back direction is greater than the dimension of the oil leakage hole 13 in the front-to-back direction, the width of the shielding portion 41 in the left-to-right direction is greater than the dimension of the oil leakage hole 13 in the left-to-right direction, the shielding portion 41 is higher than the oil leakage hole 13, and the gap between the shielding portion 41 and the surface where the oil leakage hole 13 is located forms an oil-passing gap. The smoke hood of the utility model, when the smoke hood is working, the smoke exhaust fan 2 of the smoke hood runs and forms a negative pressure in the smoke collecting chamber 11. Under the action of the negative pressure, when the oil smoke generated by the user's cooking flows into the smoke collecting chamber 11, a part of the oil smoke will enter the smoke collecting chamber 11 through the oil leakage hole 13. When the oil smoke continues to flow through the oil leakage hole 13, it will impact the shielding part 41 of the shielding structure 4. Since the shielding part 41 blocks the airflow passing through the oil leakage hole 13, after the airflow impacts the shielding part 41, under the action of the shielding part 41, part of the airflow will flow back, and the other part will flow along the shielding part 41 and flow out from the oil passing gap. The airflow that passes through the oil leakage hole 13 and is blocked by the shielding part 41 will not directly impact the airflow in the smoke collecting chamber 11, and has a relatively small impact on the airflow in the smoke collecting chamber 11. In addition, the airflow that enters the smoke collecting chamber 11 after being blocked by the shielding part 41 has a reduced flow velocity, and the noise generated will also be reduced. Since the shielding structure 4 is provided and the shielding portion 41 of the shielding structure 4 shields the oil leakage hole 13, under the action of the negative pressure in the smoke collecting chamber 11, when the smoke flows through the oil leakage hole 13, the oil in and near the oil leakage hole 13 is driven upward, and when the oil splashes upward with the airflow, it is blocked by the shielding portion 41, so that the oil can be prevented from splashing everywhere.

[0041] See also Figure 2 In the range hood of the present invention, the front end of the shielding portion 41 is provided with a first connection portion, and the rear end of the shielding portion 41 is provided with a second connection portion. The first connection portion and the second connection portion are connected to the inner wall surface of the smoke collecting chamber 11, and the shielding portion 41 is placed above the oil leakage hole 13. The first connection portion and the second connection portion are provided so that the shielding structure 4 can be better installed in the smoke collecting chamber 11. The first connection portion can be glued to the inner wall surface of the corresponding side of the smoke collecting chamber 11, or fixed to the inner wall surface of the corresponding side of the smoke collecting chamber 11 by riveting.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A range hood, characterized in that: include: A range hood body (1) comprising a smoke collecting chamber (11) and an air suction port (12) connected to the smoke collecting chamber (11); a smoke exhaust fan (2) disposed in the smoke collecting chamber (11), the air inlet of the smoke exhaust fan (2) facing the rear plate of the smoke collecting chamber (11); A noise reduction and flow guiding structure (3), comprising a flow guiding plate (31), a sound absorbing member (32) and a noise reducing plate (33), wherein the flow guiding plate (31) is connected to a rear plate of the smoke collecting chamber (11), and the sound absorbing member (32) and the noise reducing plate (33) are sequentially connected to a side of the rear plate facing the smoke collecting chamber (11), the flow guiding plate (31) and the noise reducing plate (33) are provided with micro-perforations, and a gap is provided between the noise reducing plate (33) and the rear plate of the smoke collecting chamber (11), and the gap forms a noise reducing chamber (34).

2. The range hood according to claim 1, characterized in that: The portion of the guide plate (31) facing the air inlet of the smoke exhaust fan (2) comprises a vertical section and an inclined section, the inclined section is connected to the bottom of the vertical section, the inclined section is arranged to be inclined backward from top to bottom, the surface of the inclined section facing the air inlet of the smoke exhaust fan (2) is a guide surface (311), the height of the upper edge of the guide plate (31) is higher than the height of the upper edge of the air inlet of the smoke exhaust fan (2), and the height of the upper edge of the guide surface (311) is lower than the height of the fan shaft of the smoke exhaust fan (2).

3. The range hood according to claim 2, characterized in that: The sound absorbing member (32) and the noise reduction plate (33) are arranged corresponding to the vertical section of the guide plate (31), and the gap between the inclined section and the rear plate of the smoke collecting chamber (11) also forms a part of the noise reduction chamber (34).

4. The range hood according to claim 2, characterized in that: The smoke exhaust fan (2) is arranged to be tilted backward from bottom to top, the included angle between the guide surface (311) and the front cover plate of the smoke exhaust fan (2) is α1, 40°≤α1≤90°, and the included angle between the guide surface (311) and the rear plate of the smoke collecting chamber (11) is α2, 25°≤α2≤50°.

5. The range hood according to claim 2, characterized in that: The intersection point of the extended line of the axis of the fan shaft of the smoke exhaust fan (2) and the surface where the portion of the guide plate (31) facing the air inlet of the smoke exhaust fan (2) is located is not lower than the height of the upper edge of the guide surface (311).

6. The range hood according to claim 2, characterized in that: The position where the surface where the guide surface (311) is located intersects with the surface where the air inlet of the smoke exhaust fan (2) is located is not higher than the height of the upper edge of the air inlet of the smoke exhaust fan (2).

7. The range hood according to claim 1, characterized in that: The opening rate of the micro-perforations is 0.01 to 0.05, and the diameter of the micro-perforations is 1 mm to 3 mm.

8. The range hood according to claim 1, characterized in that: The sound absorbing member (32) is sound absorbing cotton, the thickness of the sound absorbing cotton is 10 mm to 30 mm, the thickness of the noise reduction cavity (34) is 10 mm to 30 mm, and the ratio of the thickness of the sound absorbing cotton to the thickness of the noise reduction cavity (34) is 0.25 to 0.

5.

9. The range hood according to claim 8, characterized in that: A low-frequency membrane is provided on the surface of the sound-absorbing cotton on one side close to the micro-perforations.

10. The range hood according to claim 1, characterized in that: The range hood body (1) has a top plate, the air intake port (12) is arranged on the top plate, the downward projection of the upper edge of the air intake port of the smoke exhaust fan (2) is located at the rear side of the air intake port (12), and the downward projection of the center of the air intake port of the smoke exhaust fan (2) is located at the front side of the air intake port (12); an oil leakage hole (13) connected to the smoke collecting chamber (11) is also arranged on the top plate, and the oil leakage hole (13) is located at the rear side of the air intake port (12).

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