Range hood

Abstract

The utility model relates to a range hood, which belongs to the technical field of kitchen appliances and comprises a shell with a bottom plate provided with a smoke inlet, a fan arranged in the shell and a flow guide component with the edge connected to the bottom plate of the fan. A noise reduction cavity is formed between the flow guide assembly and a bottom plate of the draught fan, a plurality of through noise reduction holes are formed in the portion, corresponding to the noise reduction cavity, of the bottom plate of the draught fan, sound waves can be reflected and refracted when penetrating through the noise reduction holes, loss of sound wave energy is caused, and therefore the effect of reducing pneumatic noise is achieved.

Description

Technical Field

[0001] The utility model relates to a range hood, belonging to the technical field of kitchen appliances. Background Art

[0002] A range hood is a household kitchen appliance that uses a motor to drive the fan assembly to rotate, thereby sucking the fumes in the kitchen and exhausting them outdoors. The fans inside range hoods on the market are mostly centrifugal in design. When working, the fans create a negative pressure environment, thereby producing a suction effect on the fumes.

[0003] However, current range hoods still have defects in actual use: during operation, oil smoke will touch the bottom area of the fan, easily forming vortices where air flows intersect, thereby generating turbulence and strong vibration noise. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a range hood, which prevents the oil smoke from directly contacting the bottom area of the fan and generating eddy currents, thereby reducing the aerodynamic noise of the range hood.

[0005] The utility model is realized through the following technical solutions.

[0006] A range hood comprises a shell having a bottom plate with a smoke inlet, a fan arranged in the shell, and a guide assembly whose edge is connected to the bottom plate of the fan; a noise reduction cavity is formed between the guide assembly and the bottom plate of the fan, and a plurality of through noise reduction holes are provided in the portion of the bottom plate of the fan corresponding to the noise reduction cavity.

[0007] As a further improvement of the present invention, a silencer is provided in the noise reduction cavity. The silencer has a porous structure that is interconnected and is used to eliminate noise in the noise reduction cavity.

[0008] As a further improvement of the present invention, the silencer covers and is laid on the inner wall of the flow guide assembly.

[0009] As a further improvement of the present invention, the noise reduction holes are evenly arranged on the bottom plate of the fan, and the aperture of the noise reduction holes is 1 to 3 mm.

[0010] As a further improvement of the present invention, a boss is provided on the inner wall of the bottom plate of the fan corresponding to the edge of the noise reduction hole.

[0011] As a further improvement of the present invention, the fan has a side surface of the air inlet and a vertical air duct is formed between the inner wall corresponding to the shell, and the guide assembly has a second guide surface, which gradually approaches the air duct from the bottom end to the top end, and is used to guide the oil smoke entering the shell through the smoke inlet into the air duct.

[0012] As a further improvement of the present invention, a portion of the second guide surface extending from the bottom end toward the top end is an arc-shaped surface.

[0013] As a further improvement of the present invention, it also includes an oil net assembly arranged at the smoke inlet and an oil box arranged at the bottom of the oil net assembly; the oil box has a first guide surface, which gradually rises from the center to the edge, and is used to guide the oil smoke to diffuse to the edge of the smoke inlet and enter the oil smoke outlet.

[0014] As a further improvement of the present invention, the first guide surface is a downwardly convex arc surface.

[0015] As a further improvement of the present invention, a plurality of connecting lugs are provided at the edge of the guide assembly, and the connecting lugs are welded to the bottom plate of the shell.

[0016] Beneficial effects of the utility model:

[0017] 1. In the utility model, a plurality of noise reduction holes are provided at the bottom of the blower. When the sound waves pass through the noise reduction holes, reflection and refraction will occur, resulting in the loss of sound wave energy, thereby achieving the effect of reducing aerodynamic noise.

[0018] 2. Sound waves are reflected and refracted multiple times between the pores inside the silencer. Each reflection and refraction will cause further loss of sound wave energy, thereby achieving the effect of reducing aerodynamic noise.

[0019] 3. Oil smoke will gather inside the fan to form oil droplets. In the utility model, a boss is provided at the edge of the noise reduction hole to prevent oil from dripping from the noise reduction hole into the noise reduction cavity, thereby preventing the silencer from absorbing oil and avoiding clogging of the porous structure of the silencer.

[0020] 4. The silencer cotton is placed between the guide plate and the bottom plate to prevent it from being exposed to oil smoke, which will clog the porous structure of the silencer cotton and reduce the noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following is a detailed description of preferred embodiments of the present invention with reference to the accompanying drawings to help understand the purpose and advantages of the present invention, wherein:

[0022] Figure 1 This is a schematic diagram of the internal structure of the range hood in the embodiment of the present utility model;

[0023] Figure 2 This is an exploded view of an embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the fan structure in the embodiment of the present utility model;

[0025] Figure 4 For the embodiment of the utility model corresponding Figure 3 A partial enlarged view of the middle part;

[0026] Figure 5 This is a schematic diagram of the noise reduction hole structure in an embodiment of the present utility model;

[0027] Figure 6 This is a schematic structural diagram of the flow guide assembly in an embodiment of the present utility model;

[0028] Figure 7 This is a schematic diagram of the internal structure of the flow guide assembly in an embodiment of the present utility model;

[0029] Figure 8 For the embodiment of the utility model corresponding Figure 7 A partial enlarged view of point B in the middle;

[0030] Figure 9 This is a schematic diagram of the oil screen assembly structure in an embodiment of the present utility model;

[0031] Figure 10 For the embodiment of the utility model corresponding Figure 9 A partial enlarged view of point C in the middle.

[0032] Reference numerals in the figure: shell 1, smoke inlet 101, fan 2, air inlet 201, bottom plate 202, first oil guide hole 203, noise reduction hole 204, boss 205, air duct 3, guide assembly 4, second guide surface 401, third guide surface 402, connecting surface 403, first guide surface 4011, second guide surface 4012, connecting lug 404, second oil guide hole 405, noise reduction cavity 406, oil path area 4062, silencer area 4061, partition 407, oil net assembly 5, third oil guide hole 501, oil collecting plate 502, filter 503, oil box 6, silencer 7. DETAILED DESCRIPTION

[0033] The present invention will be described in further detail below based on the accompanying drawings and implementation examples.

[0034] In this specification, directional terms such as up, down, left, right, front, back, front, back, top, and bottom, which are mentioned or may be mentioned, are defined relative to the configurations shown in the accompanying drawings. The terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may vary depending on the location and usage of the component. Therefore, these or other directional terms should not be construed as restrictive.

[0035] refer to Figures 1 to 10 , the embodiments of the present utility model disclose:

[0036] A range hood comprises a shell 1 with a smoke inlet 101 at the bottom, a fan 2 arranged in the shell 1, a guide assembly 4 located between the bottom of the fan 2 and the smoke inlet 101, and an oil net assembly 5 arranged at the smoke inlet 101; in this embodiment, the edge of the guide assembly 4 is connected to the bottom plate 202 of the fan 2; wherein, a vertical air duct 3 is formed between a side surface of the fan 2 having the air inlet 201 and the corresponding inner wall of the shell 1, the guide assembly 4 has a second guide surface 401, and the second guide surface 401 gradually approaches the air duct 3 from the bottom end to the top end, and is used to guide the oil smoke entering the shell 1 from the smoke inlet 101 into the air duct 3; the oil smoke contacts the guide assembly 4 during the rising process, and the second guide surface 401 guides the oil smoke into the air duct 3 to avoid the oil smoke directly contacting the bottom area of the fan 2 and generating vortexes, thereby reducing the aerodynamic noise of the range hood.

[0037] The second guide surface 401 extends from the bottom end to the top end in a curved surface; Figure 7 As shown, the second guide surface 401 can be divided into two parts, specifically including a first guide surface 4011 extending upward from the bottom end, the first guide surface 4011 is an arc-shaped surface, and a second guide surface 4012 including a lower end connected to the first guide surface 4011 and extending toward the top end, and in this embodiment, the second guide surface 4012 can be an inclined surface or an arc-shaped surface; during the rising process, the oil smoke first contacts the first guide surface 4011, and at this time the oil smoke flows upward along the surface of the first guide surface 4011. Since the first guide surface 4011 is set as an arc-shaped surface, the oil smoke forms a continuous and smooth flow path on its surface to reduce the sudden change of the oil smoke flow speed and the sharp change of direction, thereby reducing the formation of vortexes, and further reducing the aerodynamic noise of the range hood.

[0038] A noise reduction cavity 406 is formed between the guide component 4 and the bottom plate 202 of the fan 2, and a silencer 7 is arranged in the noise reduction cavity 406. The silencer 7 has a porous structure that is interconnected (for example, the silencer is a structure such as silencer cotton), which is used to eliminate the noise in the noise reduction cavity 406; the silencer 7 covers and is laid on the inner wall of the guide component 4; when the fan 2 drives the oil smoke to rise and generate noise, the sound waves will be reflected and refracted multiple times between the silencer cotton fibers and pores inside the silencer cotton, and each reflection and refraction will cause further loss of sound wave energy, thereby achieving the effect of reducing aerodynamic noise.

[0039] The bottom plate 202 of the fan 2 is provided with a plurality of through noise reduction holes 204 corresponding to the portion of the noise reduction cavity 406; specifically, the noise reduction holes 204 are evenly arranged on the bottom plate 202 of the fan 2, and the aperture of the noise reduction holes 204 is 1 to 3 mm (for details, please refer to the article number: 1006-1355202001-0219-04, the article title: Design method of micro-perforated plate and its application in range hood); the inner wall of the bottom plate 202 of the fan 2 is provided with a raised boss 205 corresponding to the edge of the noise reduction hole 204, which is used to prevent oil from flowing into the noise reduction cavity 406 from the noise reduction hole 204.

[0040] The guide component 4 has two oppositely arranged second guide surfaces 401 and two oppositely arranged third guide surfaces 402, and the edges of the two second guide surfaces 401 are respectively connected to the edges of the two third guide surfaces 402; the third guide surface 402 is an arc-shaped surface extending from the bottom end toward the top end; the third guide surface 402 is similar to the second guide surface 401, and is used to guide the oil smoke into the air duct 3 when the oil smoke is in the rising process and contacts the guide component 4, so as to avoid the oil smoke directly contacting the bottom area of the fan 2 and generating vortexes, thereby reducing the aerodynamic noise of the range hood.

[0041] The guide component 4 has a connecting surface 403 connecting the edge of the second guide surface 401 and the edge of the third guide surface 402, and the connecting surface 403 transitions in an arc shape from the edge of the second guide surface 401 to the edge of the third guide surface 402; in this embodiment, the air duct 3 and the second guide surface 401 are located on the same side, so that during the rising process, the oil smoke will continuously cross the connecting surface 403 from the third guide surface 402 and gradually move toward the second guide surface 401. The connecting surface 403 transitions in an arc shape, so that the oil smoke flows more smoothly at the edges of the second guide surface 401 and the third guide surface 402.

[0042] Since the second guide surface 401 and the third guide surface 402 are provided in this embodiment, the oil smoke can flow smoothly around the guide component 4. Therefore, no matter whether the fan 2 in this embodiment is provided with one air inlet 201 or two air inlets 201, the guide component 4 can achieve the effect of guiding and draining the oil smoke to the air inlet 201; and specifically in this embodiment, the fan 2 has two air inlets 201, and the two air inlets 201 are respectively provided on two opposite side surfaces.

[0043] The edge of the guide component 4 is connected to the base plate 202 of the fan 2. Specifically, a plurality of connecting lugs 404 are provided at the edge of the guide component 4, and the connecting lugs 404 are welded to the base plate 202 of the shell 1. In this embodiment, welding is adopted. Compared with other connection methods (such as snap connection or screw connection), the welding method has a simple structure and high connection strength. At the same time, since the surface of the welding part is relatively smooth, the influence of the connection method on the guidance and drainage of the guide component 4 can be reduced.

[0044] In this embodiment, an oil box 6 is provided at the bottom of the oil net assembly 5; the oil box 6 has a first guide surface 601, which is gradually raised from the center to the edge, and is used to guide the oil smoke to diffuse toward the edge of the smoke inlet 101 and enter the smoke inlet 101. The first guide surface 601 is a downwardly convex arc surface; similarly to the second guide surface 401, when the oil smoke is in the rising process and contacts the first guide surface 601, the first guide surface 601 guides the oil smoke to diffuse toward the edge of the smoke inlet 101 and enter the smoke inlet. In 101, the first guide surface 601 presents a downwardly convex arc surface so that the oil smoke forms a continuous and smooth flow path on its surface, so as to reduce the sudden change of oil smoke flow speed and the sharp change of direction, thereby reducing the formation of vortex, and further reducing the aerodynamic noise of the range hood; the oil box 6 with the first guide surface 601 is used to initially guide the oil smoke, and then the guide component 4 is used to guide the oil smoke, so as to achieve a multi-stage guide effect, so as to reduce the formation of vortex, thereby effectively reducing the aerodynamic noise.

[0045] When the oil smoke enters the fan 2, the oil smoke will gradually gather in the fan 2 to form oil droplets and drip downward into the oil box 6. Since the airflow generated by the fan 2 will drive the oil smoke to rise and flow toward the air duct 3, when the oil droplets fall and the oil smoke rises, the oil smoke will drive the oil droplets to move to the side, so that the oil droplets dripping downward from the fan 2 cannot accurately flow into the oil box. In this embodiment, since the guide component 4 is provided on the lower side of the fan 2, the oil droplets will drip into the guide component 4. More specifically, If oil droplets drip into the silencer 7, and since the silencer 7 has a porous structure that is interconnected, the porous structure will be clogged after the silencer 7 absorbs the oil droplets. Based on this, in this embodiment, a first oil guide hole 203 is provided at the bottom plate 202 of the fan 2, the guide component 4 is provided with a second oil guide hole 405, and the oil net component 5 is provided with a third oil guide hole 501, so that the oil in the fan 2 flows into the oil box 6 through the first oil guide hole 203, the second oil guide hole 405, and the third oil guide hole 501 in sequence.

[0046] Specifically, the first oil guide hole 203 is provided at the lowest point of the bottom plate 202 of the fan 2 , so that the oil droplets in the fan 2 can drip downward from the first oil guide hole 203 .

[0047] A baffle structure is provided on the inner wall of the guide component 4, which divides the inner wall of the guide component 4 into a silencer area 4061 where the silencer 7 is laid and an oil path area 4062 where the silencer 7 is not laid; the second oil guide hole 405 is located in the oil path area 4062. In this embodiment, the first oil guide hole 203 corresponds to the oil path area 4062, so that oil droplets can fall into the oil path area 4062 to prevent the oil droplets from contaminating the silencer 7.

[0048] The baffle structure includes two spaced-apart partitions 407 ; the portion of the inner wall of the guide assembly 4 between the two partitions 407 is the oil path area 4062 , and the portion outside the two partitions 407 is the silencer area 4061 ; the second oil guide hole 405 is located at the lowest point of the oil path area 4062 .

[0049] The oil screen assembly 5 includes an oil collecting plate 502 and a filter screen 503 surrounding and connected to the oil collecting plate 502; the filter screen 503 is arranged to tilt upward from the inside to the outside, so that the oil on the filter screen 503 converges onto the oil collecting plate 502, and the third oil guide hole 501 is arranged on the oil collecting plate 502; since in this embodiment the oil collecting plate 502 not only guides the oil droplets dripping downward from the fan 2, but is also used to guide the oil converged from the filter screen 503, the flow rate required to be guided by the oil collecting plate 502 will be greater than the flow rate of oil droplets dripping downward from the fan 2. Therefore, in this embodiment, a plurality of third oil guide holes 501 are provided, which are set to 3 in this embodiment, and can also be set to other numbers, and are evenly spaced along the circumferential direction on the oil collecting plate 502.

[0050] Thus, the oil attached to the filter 503 can flow back to the oil collecting plate 502. Figure 2 As shown, the oil box 6 is arranged on the lower side of the oil collecting plate 502, so that the oil dirt can eventually fall into the oil box 6, thereby preventing the oil droplets from dripping into the silencer 7 when falling, and avoiding clogging the porous structure of the silencer 7.

[0051] Working principle:

[0052] When the range hood is working, the fan 2 starts to generate airflow to drive the oil smoke to rise. During the rising process, the oil smoke first contacts the oil box 6. Figure 1 As shown, the first guide surface 601 of the oil box 6 guides the oil smoke to diffuse toward the edge of the smoke inlet 101 and enter the smoke inlet 101, so as to preliminarily avoid the formation of vortexes during the rising process of the oil smoke; at this time, most of the oil smoke (a) follows the air flow directly into the air duct 3 and is discharged through the fan 2, while at the same time, a small part of the oil smoke (b) moves upward to the guide component 4. At this time, the second guide surface 401 and the third guide surface 402 of the guide component 4 guide and drain the oil smoke, so that it flows into the air duct 3 and is finally discharged, which effectively reduces the formation of vortexes and reduces aerodynamic noise, thereby improving the user experience.

[0053] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above implementation cases, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above implementation cases, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A range hood, characterized in that: The invention comprises a housing (1) having a smoke inlet (101) at the bottom, a fan (2) arranged in the housing (1), and a flow guide component (4) whose edge is connected to a bottom plate (202) of the fan (2); a noise reduction cavity (406) is formed between the flow guide component (4) and the bottom plate (202) of the fan (2), and a portion of the bottom plate (202) of the fan (2) corresponding to the noise reduction cavity (406) is provided with a plurality of through noise reduction holes (204).

2. The range hood according to claim 1, characterized in that: A silencer (7) is provided in the noise reduction cavity (406), and the silencer (7) has a porous structure that is interconnected and is used to eliminate noise in the noise reduction cavity (406).

3. The range hood according to claim 2, characterized in that: The silencer (7) covers and is laid on the inner wall of the flow guide component (4).

4. The range hood according to claim 1, characterized in that: The noise reduction holes (204) are evenly arranged on the bottom plate (202) of the fan (2), and the aperture of the noise reduction holes (204) is 1 to 3 mm.

5. The range hood according to claim 1, characterized in that: The inner wall of the bottom plate (202) of the fan (2) is provided with a boss (205) in the form of a protrusion corresponding to the edge of the noise reduction hole (204).

6. The range hood according to any one of claims 1 to 5, characterized in that: The fan (2) has a side surface of an air inlet (201) and a vertical air duct (3) formed between the side surface and the corresponding inner wall of the shell (1); the guide assembly (4) has a second guide surface (401), and the second guide surface (401) gradually approaches the air duct (3) from the bottom end to the top end, and is used to guide the oil smoke entering the shell (1) through the smoke inlet (101) into the air duct (3).

7. The range hood according to claim 6, characterized in that: A portion of the second guide surface (401) extending from the bottom end toward the top end is an arc-shaped surface.

8. The range hood according to claim 6, characterized in that: The invention also includes an oil net assembly (5) arranged at the smoke inlet (101) and an oil box (6) arranged at the bottom of the oil net assembly (5); the oil box (6) has a first guide surface (601), and the first guide surface (601) is gradually raised from the center to the edge, and is used to guide the oil smoke to diffuse toward the edge of the smoke inlet (101) and enter the smoke inlet (101).

9. The range hood according to claim 8, characterized in that: The first flow-guiding surface (601) is a downwardly convex arc-shaped surface.

10. The range hood according to claim 6, characterized in that: A plurality of connecting lugs (404) are provided at the edge of the flow guide assembly (4), and the connecting lugs (404) are welded to the bottom plate (202) of the shell (1).

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