Range hood

Abstract

This utility model relates to a range hood, comprising: a smoke collection hood; a fan system; a vertically extending air intake in the middle region of the front sidewall of the smoke collection hood in the left-right direction, and an air inlet plate arranged in front of the air intake and protruding forward relative to the front sidewall of the smoke collection hood; two air inlets are correspondingly defined between the left and right sides of the air inlet plate and the front sidewall of the smoke collection hood, and the two air inlets are connected to the inner cavity of the smoke collection hood; or, the air inlet plate defines two air inlets located on the left and right sides respectively, with the opening directions of the two air inlets facing the left and right sides respectively; a first noise reduction component is provided in the area corresponding to the left and right sides of the air intake inlet inside the smoke collection hood. The space between the front sidewall of the smoke collection hood and the air inlet plate or the two sides inside the smoke collection hood naturally forms a relatively independent and usable space area, which provides a physical installation basis for arranging a thick, high-performance first noise reduction component.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a range hood. Background Technology

[0002] A range hood is a kitchen appliance used to purify the kitchen environment. To reduce noise, most existing range hoods install sound-absorbing cotton inside the fan frame (the upper housing for the fan system), primarily around the fan frame and the volute. However, installing sound-absorbing cotton inside the fan frame encroaches on the range hood's airflow, reducing the ventilation area and increasing airflow resistance. In particular, the fan frame is typically installed inside kitchen wall cabinets, which are generally 350-370mm deep. After accounting for the volute thickness and airflow channel width, the space left for sound-absorbing cotton is very small. Therefore, the thickness of the sound-absorbing cotton installed inside the fan frame is often quite thin, generally less than 20mm. Because different thicknesses of sound-absorbing cotton have different absorption coefficients for different noise frequencies, the thicker the sound-absorbing cotton, the more obvious the sound absorption effect on mid- and low-frequency noise. Therefore, the limited thickness of sound-absorbing cotton arranged inside the fan frame is not conducive to the absorption of mid- and low-frequency noise (mid- and low-frequency noise can be understood as noise below 1000Hz), and it is difficult to effectively improve the noise problem of the range hood.

[0003] Therefore, existing range hoods still need further improvement. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a range hood with good noise reduction effect, based on the current state of the technology.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a range hood, comprising:

[0006] Smoke hood;

[0007] The front sidewall of the smoke hood has a vertically extending air intake in the middle area in the left-right direction, and an air inlet plate arranged in front of the air intake and protruding forward relative to the front sidewall of the smoke hood.

[0008] Two air inlets are defined between the left and right sides of the air inlet plate and the front side wall of the smoke hood, and the two air inlets are connected to the inner cavity of the smoke hood; or, two air inlets are defined on the air inlet plate, located on the left and right sides respectively, and the opening directions of the two air inlets are facing the left and right sides respectively.

[0009] The smoke hood is equipped with first noise reduction components in the areas corresponding to the left and right sides of the air intake.

[0010] The aforementioned "vertical extension" is not limited to vertical extension; it can also be understood as the direction of extension having a certain angle of inclination relative to the vertical direction.

[0011] As an improvement, the system also includes a fan frame and a fan system, with the fan system housed within the fan frame. The left-right dimensions of the smoke hood are larger than those of the fan frame, resulting in raised shoulders protruding to the left and right relative to the fan frame on both sides of the smoke hood. Two first noise reduction components are respectively arranged within the two raised shoulders of the smoke hood. By utilizing the space of the raised shoulders, which are wider than the fan frame, the noise reduction components are embedded in unused areas, saving additional installation space. The noise reduction components are located close to the left and right sides of the fan system at the bottom, directly absorbing noise propagated laterally by the fan.

[0012] As an improvement, the first noise reduction component includes a first noise reduction plate and a first sound-absorbing component. The first noise reduction plate and the corresponding portion of the inner sidewall of the smoke hood define a first noise reduction chamber. The first sound-absorbing component fills the first noise reduction chamber, and the first noise reduction plate has first noise reduction holes that communicate with the first noise reduction chamber. The first noise reduction chamber, combined with the porous sound-absorbing component and the noise reduction holes, absorbs low- and mid-frequency noise through the Helmholtz resonance principle. On the other hand, the first noise reduction plate can isolate oil mist from the sound-absorbing component to a certain extent, preventing the pores of the sound-absorbing material from becoming clogged and extending its service life.

[0013] As an improvement, the two first noise-reducing panels extend vertically within the smoke hood and are opposite each other in the left-right direction. The vertical extension matches the airflow direction of the air intake, reducing airflow disturbance noise.

[0014] To achieve effective air intake, the front wall of the fume hood slopes backward from top to bottom, and the air intake plate also slopes backward from top to bottom. The angle of inclination of the air intake plate relative to the vertical is greater than the angle of inclination of the front wall of the fume hood relative to the vertical. This structural design allows the larger angle of the air intake plate to form a "trumpet-shaped" inlet, guiding airflow towards the central air intake, increasing the core wind speed, and reducing the escape of cooking fumes.

[0015] As an improvement, the inclination angle of the front sidewall of the fume hood relative to the vertical direction is less than 30°. This design provides users with ample cooking space, allowing them to not only toss pans but also place tall pans without interfering with the range hood.

[0016] To simplify the connection structure between the air inlet plate and the smoke hood, the air inlet plate is a vertically extending strip plate. The upper end of the air inlet plate is connected to the top front side of the smoke hood, and the lower end of the air inlet plate is connected to the bottom front side of the smoke hood.

[0017] To improve smoke collection efficiency and provide a mounting base for the upper part of the air inlet plate, the top front side of the smoke hood has a forward-protruding head. The upper edge of the air inlet plate is connected to the protruding head, and the lower edge is connected to the lower part of the front sidewall of the smoke hood. The front-to-back dimensions of the smoke hood gradually increase from bottom to top, and the front-to-back dimension at the point where the upper part of the smoke hood connects with the protruding head is less than half the front-to-back dimension of the fan frame, thereby allowing the smoke hood to be made thinner overall.

[0018] To ensure the air inlet plate is positioned as far forward as possible at both its upper and lower ends, maximizing the air intake area, the bottom edge of the smoke hood's air intake also features an oil collection plate extending forward and upward at an angle. The bottom edge of the air inlet plate connects to the front of the oil collection plate. This oil collection plate can be an integral part of the air inlet plate or a separate component.

[0019] Considering that the oil fumes that rise instantly during stir-frying cannot be captured in time by the first air inlet on the lower side, in order to reduce the escape of oil fumes in the upper area of ​​the fume hood, an auxiliary smoke extraction port that communicates with the inner cavity of the fume hood is also provided on the bottom wall of the convex head of the fume hood.

[0020] As an improvement, the auxiliary smoke inlet is a strip-shaped inlet that extends in the left-right direction.

[0021] To further increase the smoke collection area and reduce the escape of oil fumes, the front side of the bottom wall of the convex head of the smoke collection hood is also provided with a forward-extending smoke collection plate.

[0022] To further improve the noise reduction effect, a second noise reduction component is also included, located on the back of the air inlet panel. This second noise reduction component on the back of the air inlet panel absorbs noise from the front. Together with the two first noise reduction components located inside the smoke hood, they achieve a very good noise reduction effect.

[0023] In a further improvement, the second noise reduction component includes a second noise reduction plate and a second sound-absorbing component. The second noise reduction plate is located behind the air inlet plate, and the extension direction of the second noise reduction plate is consistent with the extension direction of the air inlet plate. A second noise reduction chamber is defined between the second noise reduction plate and the air inlet plate. The second sound-absorbing component is filled in the second noise reduction chamber. The second noise reduction plate has second noise reduction holes that communicate with the second noise reduction chamber.

[0024] Compared with existing technologies, the advantages of this invention are as follows: This invention arranges the noise reduction structure (first noise reduction component) on the left and right sides of the air intake inside the smoke hood, thus avoiding the strict space limitations of traditional fan frames (located inside the hanging cabinet) (typically only 350-370mm deep, with sound-absorbing cotton thickness <20mm). Therefore, the first noise reduction component can use sound-absorbing materials much thicker than 20mm (such as thickened sound-absorbing cotton, composite structures, etc.). According to acoustic principles (the greater the thickness of the sound-absorbing material, the higher the sound absorption coefficient for mid-to-low frequency noise), the absorption effect on mid-to-low frequency noise below 1000Hz is significantly enhanced, which is precisely the noise problem that traditional solutions struggle to solve. Moving the noise reduction component out of the fan frame area avoids the problem of sound-absorbing cotton encroaching on the internal air duct of the fan frame in traditional solutions. The internal space of the fan frame is freed up, ensuring maximum ventilation area of ​​the air duct and effectively reducing air intake resistance. This not only helps maintain or improve the airflow and air pressure performance of the range hood, avoiding the problem of sacrificing suction power for noise reduction, but the smoother airflow itself also helps reduce secondary noise caused by turbulence. In particular, the design of the "protruding air inlet plate" (side air inlet or left and right opening air inlet) in this application not only forms an effective airflow channel, but more importantly, it naturally forms a relatively independent and usable space area between the front side wall of the smoke hood and the air inlet plate or on both sides inside the smoke hood. This provides a physical installation basis for arranging a thick, high-performance first noise reduction component. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the range hood according to an embodiment of the present utility model;

[0026] Figure 2 This is a left view of the range hood according to an embodiment of the present utility model;

[0027] Figure 3 This is a vertical sectional perspective view of the range hood of this utility model, cut along the front-to-back direction;

[0028] Figure 4 This is a cross-sectional perspective view of the range hood according to an embodiment of the present utility model;

[0029] Figure 5 This is a vertical sectional perspective view of the range hood of this utility model, cut along the left-right direction. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0032] Figures 1-5 A preferred embodiment of the range hood of this utility model is shown. The range hood includes a housing and a fan system 60 disposed within the housing, the fan system 60 generally being a centrifugal fan. The housing generally includes a fan frame 20 and a smoke collection hood 10 disposed at the bottom of the fan frame 20, the inner cavity of the fan frame 20 communicating with the inner cavity of the smoke collection hood 10. The front of the smoke collection hood 10 has an air inlet 31, through which external smoke can enter the smoke collection hood 10. The centrifugal fan is disposed within the fan frame 20; when the centrifugal fan operates, it generates negative pressure, and external oil fumes can be drawn into the smoke collection hood 10 through the air inlet 31. An oil screen is also provided at the air inlet 31 of the smoke collection hood 10 for filtering oil fumes. An oil cup (not shown in the figure) is provided at the bottom of the smoke collection hood 10; the oil cup is a long strip extending laterally, used to collect oil stains flowing down from the smoke collection hood 10.

[0033] See Figure 5 In this embodiment, the left-right dimensions of the smoke hood 10 are larger than those of the upper fan frame 20, resulting in corresponding protruding shoulders 12 on the left and right sides of the smoke hood 10, protruding to the left and right relative to the fan frame 20, respectively. The top of the smoke hood 10 has a forward-protruding head 13. The front-to-back dimensions of the smoke hood 10 gradually increase from bottom to top. However, the front-to-back dimension of the main body of the smoke hood 10 (i.e., the part excluding the head 13) where it connects with the head 13 (i.e., the maximum front-to-back dimension of the main body of the smoke hood 10) is slightly smaller than half the front-to-back dimension of the fan frame 20. The front sidewall 101 of the main body of the smoke hood 10 slopes backward from top to bottom, while the rear sidewall of the main body of the smoke hood 10 extends substantially vertically. Specifically, the angle of inclination of the front sidewall 101 of the main body of the smoke hood 10 relative to the vertical direction is less than 30°, preferably 15°. Therefore, the main body of the fume hood 10 can be made relatively thin, which can free up enough cooking space for users, allowing them to not only toss the pan but also place tall pans without interfering with the range hood.

[0034] See Figure 1 The bottom wall of the convex head 13 of the smoke hood 10 is also provided with a strip-shaped auxiliary smoke inlet 130 extending in the left and right direction, which is used to capture the oil fumes rising during stir-frying.

[0035] Combination Figure 4 The front sidewall 101 of the main body of the smoke hood 10 has a vertically extending air intake 11 in the middle of the left-right direction. The air intake 11 penetrates the front sidewall of the smoke hood 10 and connects to its inner cavity. Specifically, the air intake 11 extends upward to the location of the protruding head 13 and downward to the bottom of the main body of the smoke hood 10.

[0036] See Figure 3 In this embodiment, an air inlet plate 30 is also arranged on the front side of the air intake 11 of the smoke hood 10. The air inlet plate 30 is also a vertically extending strip plate, which is inclined backward from top to bottom, and its inclination angle with the vertical direction is 25° (greater than the inclination angle of the front wall of the smoke hood 10). The left and right dimensions of the air inlet plate 30 are basically the same as the left and right dimensions of the air intake 11. Two lateral air inlets 31 are defined between the left and right sides of the air inlet plate 30 and the front wall of the smoke hood 10, which connect to the inner cavity of the smoke hood 10. The opening directions of the two lateral air inlets 31 are respectively set to the left and right. The upper end of the air inlet plate 30 is welded to the protruding head 13 of the smoke hood 10 or fixed by screws, and the lower end is connected to the bottom of the front wall of the smoke hood 10 by welding or screws.

[0037] The front middle area of ​​the fume hood 10 is designed with two air inlets 31 on the left and right to draw in the oil fumes generated in the cooking areas on the left and right sides. These air inlets 31 can absorb the oil fumes generated in the cooking areas on the left and right sides in a timely manner. Some of the oil fumes are directly drawn in from the air inlets 31 on the left and right sides, while the remaining oil fumes go up along the front side wall 101 of the fume hood 10. After encountering the protruding head 13 and the smoke collection plate 15, they are drawn out by the auxiliary smoke inlet 130 at the top, thus preventing the oil fumes from escaping.

[0038] The bottom of the air intake 11 of the fume hood 10 is provided with an oil receiving plate 14 that extends forward and upward, and the bottom edge of the air inlet plate 30 is connected to the front of the oil receiving plate 14. Of course, the oil receiving plate 14 can be designed as an integral part of the air inlet plate 30, such as the bottom of the air inlet plate 30 being bent backward and downward to form the oil receiving plate 14, and the oil receiving plate 14 is connected to the bottom edge of the air intake 11 of the fume hood 10.

[0039] In this embodiment, the smoke hood 10 is further equipped with a first noise reduction component. There are two sets of the first noise reduction component, located in the spaces of the protruding shoulders 12 on the left and right sides of the air intake 11 inside the smoke hood 10 (formed because the width of the smoke hood 10 is greater than that of the fan frame 20). Each first noise reduction component includes a first noise reduction plate 41 and a first sound-absorbing component 42 (50mm thick polyester fiber sound-absorbing cotton). The first noise reduction plate 41 and the inner sidewall of the smoke hood 10 form a first noise reduction chamber, which is tightly filled by the first sound-absorbing component 42. The first noise reduction plate 41 has first noise reduction holes 410 evenly distributed on it, which absorb low- and mid-frequency noise through Helmholtz resonance. The aperture and opening ratio of the first noise reduction holes 410 on the first noise reduction plate 41 can be selected according to the actual noise reduction needs, such as a aperture of 2mm and an opening ratio of 20%.

[0040] In this embodiment, the interior of the smoke hood 10 is located at the protruding shoulders 12 on both sides of the air intake 11. Its depth can be made very large. For example, the width (i.e., the left and right dimensions) of the fan frame 20 is generally 420mm, and the width of the smoke hood 10 is generally 890mm. Then, the maximum depth of one side can be (890-420) / 2=235mm. Therefore, a very thick sound-absorbing cotton (side sound-absorbing cotton) can be placed in this area to absorb the low-frequency noise transmitted from the fan system 60 above the smoke hood 10.

[0041] The front side of the bottom wall of the protruding head 13 of the smoke hood 10 is also provided with a smoke collection plate 15 that extends horizontally forward to expand the smoke collection area.

[0042] In this embodiment, a second noise reduction component is provided on the back of the air inlet plate 30. The second noise reduction component includes a second noise reduction plate 51 parallel to the air inlet plate 30, which together form a second noise reduction chamber. The second noise reduction chamber is filled with a second sound-absorbing element 52, which can also be sound-absorbing cotton. The aperture and opening ratio of the second noise reduction holes 510 on the second noise reduction plate 51 can be selected according to the actual noise reduction needs.

[0043] In this embodiment, the range hood places the noise reduction structure (first noise reduction component) on both sides of the air intake 11 inside the smoke collection hood 10. This avoids the strict space limitations of the traditional fan frame 20 (located inside the wall cabinet) (typically only 350-370mm deep, with sound-absorbing cotton thickness <20mm). Therefore, the first noise reduction component can use sound-absorbing materials much thicker than 20mm (such as thickened sound-absorbing cotton, composite structures, etc.). According to acoustic principles (the thicker the sound-absorbing material, the higher the sound absorption coefficient for mid-to-low frequency noise), the absorption effect on mid-to-low frequency noise below 1000Hz is significantly enhanced, which is precisely the noise problem that traditional solutions struggle to solve. Moving the noise reduction component out of the fan frame 20 area avoids the problem of sound-absorbing cotton encroaching on the internal air duct of the fan frame 20 in traditional solutions. The internal space of the fan frame 20 is freed up, ensuring maximum ventilation area of ​​the air duct and effectively reducing air intake resistance. This not only helps maintain or improve the airflow and air pressure performance of the range hood, avoiding the problem of sacrificing suction power for noise reduction, but the smoother airflow itself also helps reduce secondary noise caused by turbulence. In particular, the design of the "protruding air inlet plate 30" (side air inlet 31 or left and right opening air inlet 31) in the solution of this application not only forms an effective airflow channel, but more importantly, it naturally forms a relatively independent and usable space area between the front side wall 101 of the smoke hood 10 and the air inlet plate 30 or on both sides inside the smoke hood 10. This provides a physical installation basis for arranging a thick, high-performance first noise reduction component.

Claims

1. A range hood, comprising: Smoke hood (10); The feature is that: the front sidewall (101) of the smoke hood (10) has a vertically extending air inlet (11) in the middle area in the left and right direction, and an air inlet plate (30) arranged in front of the air inlet (11) and protruding forward relative to the front sidewall (101) of the smoke hood (10); Two air inlets (31) are defined between the left and right sides of the air inlet plate (30) and the front sidewall (101) of the smoke hood (10), and the two air inlets (31) are connected to the inner cavity of the smoke hood (10); or, two air inlets (31) are defined on the air inlet plate (30) located on the left and right sides respectively, and the opening directions of the two air inlets (31) are respectively facing the left and right sides; The smoke hood (10) is equipped with a first noise reduction component in the area corresponding to the left and right sides of the air intake (11).

2. The range hood according to claim 1, characterized in that: It also includes a fan frame (20) and a fan system (60), the fan system (60) being located inside the fan frame (20). The left and right dimensions of the smoke hood (10) are larger than the left and right dimensions of the fan frame (20), so that the left and right sides of the smoke hood (10) respectively form protruding shoulders (12) that protrude to the left and right relative to the fan frame (20). The two first noise reduction components are respectively arranged in the two protruding shoulders (12) of the smoke hood (10).

3. The range hood according to claim 2, characterized in that: The first noise reduction component includes a first noise reduction plate (41) and a first sound-absorbing component (42). The first noise reduction plate (41) and the corresponding portion of the inner sidewall of the smoke hood (10) define a first noise reduction chamber. The first sound-absorbing component (42) fills the first noise reduction chamber. The first noise reduction plate (41) has first noise reduction holes (410) that communicate with the first noise reduction chamber.

4. The range hood according to claim 3, characterized in that: The two first noise reduction plates (41) extend vertically within the smoke hood (10) and are opposite each other in the left-right direction.

5. The range hood according to claim 1, characterized in that: The front sidewall (101) of the smoke hood (10) is inclined backward from top to bottom, and the air inlet plate (30) is also inclined backward from top to bottom as a whole. The inclination angle of the air inlet plate (30) relative to the vertical direction is greater than the inclination angle of the front sidewall (101) of the smoke hood (10) relative to the vertical direction.

6. The range hood according to claim 5, characterized in that: The front sidewall (101) of the smoke hood (10) has an inclination angle of more than 60° relative to the vertical direction.

7. The range hood according to any one of claims 1 to 6, characterized in that: The air inlet plate (30) is generally a vertically extending strip plate. The upper end of the air inlet plate (30) is connected to the top front side of the smoke hood (10), and the lower end of the air inlet plate (30) is connected to the bottom front side of the smoke hood (10).

8. The range hood according to claim 7, characterized in that: The front top of the smoke hood (10) has a forward-protruding head (13), the upper edge of the air inlet plate (30) is connected to the head (13), and the lower edge is connected to the lower part of the front side wall (101) of the smoke hood (10).

9. The range hood according to claim 8, characterized in that: The bottom edge of the air intake (11) of the smoke hood (10) also has an oil receiving plate (14) that extends forward and upward, and the bottom edge of the air inlet plate (30) is connected to the front of the oil receiving plate (14).

10. The range hood according to claim 8, characterized in that: An auxiliary smoking port (130) communicating with the inner cavity of the smoke hood (10) is also provided on the bottom wall of the protruding head (13) of the smoke hood (10).

11. The range hood according to claim 10, characterized in that: The auxiliary smoking port (130) is a strip-shaped port that extends in the left-right direction.

12. The range hood according to claim 10, characterized in that: The front side of the bottom wall of the protruding head (13) of the smoke hood (10) is also provided with a forward-extending smoke collection plate (15).

13. The range hood according to claim 7, characterized in that: It also includes a second noise reduction component located on the back of the air inlet plate (30).

14. The range hood according to claim 13, characterized in that: The second noise reduction component includes a second noise reduction plate (51) and a second sound-absorbing component (52). The second noise reduction plate (51) is located on the rear side of the air inlet plate (30), and the extension direction of the second noise reduction plate (51) is consistent with the extension direction of the air inlet plate (30). A second noise reduction chamber is defined between the second noise reduction plate (51) and the air inlet plate (30). The second sound-absorbing component (52) is filled in the second noise reduction chamber. The second noise reduction plate (51) has second noise reduction holes (510) that communicate with the second noise reduction chamber.

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