An air inlet structure of a range hood

Abstract

An oil fume extractor air inlet structure, including lower air inlet body, the top of lower air inlet body is equipped with air inlet baffle, the lower side of air inlet baffle is equipped with smoke deflector, lower air inlet body has lower panel, the upper side of smoke deflector rear edge and lower panel upper side form upper air inlet, the lower side of lower panel forms lower air inlet, lower air inlet body has vertical air inlet channel, the rear side of air inlet baffle has upper guide surface, the rear edge of upper guide surface is bent downward and forms rear guide surface, the lower edge of rear guide surface is bent forward and downward and forms lower guide surface, lower air inlet is in fluid communication with upper air inlet through the lower air hole in lower guide surface. The utility model discloses the advantages in that: the oil fume extractor air inlet structure is through the lower air hole in lower guide surface, makes lower air inlet with upper air inlet through lower air hole, because upper air inlet is relatively narrow, thereby can reduce the air flow velocity at upper air inlet, avoid appearing howling sound, improve user experience.

Description

Technical Field

[0001] This utility model relates to range hoods, and more particularly to an air intake structure for a range hood. Background Technology

[0002] As a core device for purifying the kitchen environment, the range hood's exhaust volume and operating quietness directly affect its performance. Especially in scenarios where Chinese cooking frequently generates a large amount of oil fumes, it is necessary to have sufficient exhaust volume to quickly remove the fumes, while also avoiding generating additional noise during operation that could disturb the kitchen environment. To overcome the limitations of traditional range hoods, such as obstructed air intake and insufficient exhaust volume, Chinese utility model patent No. 201620964850.8 (authorization announcement No. CN 206001578 U) proposes a high-volume range hood. This range hood achieves double-sided air intake by setting up double-sided air intake impellers inside the body, combined with the front air intake channel formed by the front side of the volute and the front panel of the body, and the rear air intake channel formed by the rear side of the volute and the rear panel of the body, thus increasing the total air intake volume. At the same time, the air intake of the mask is split into an upper air intake at the top and a lower air intake at the bottom, and the traditional double-layer oil filter is eliminated to reduce air intake resistance and further ensure smooth air intake. In addition, an angled air outlet seat that is straight and matched with the air outlet of the volute avoids airflow impact loss and maximizes the air volume, effectively improving the problem of incomplete oil fume removal in traditional range hoods.

[0003] However, the existing high-volume range hoods still have a critical unresolved flaw in their air intake structure: the lower air intake only connects to the rear air intake channel of the fan, and there is no through-type structure between the lower and upper air intakes. These are independent air intake paths, directly leading to an unbalanced airflow distribution in the intake system, thus causing the whistling sound. Because the lower air intake connects only to the dual-sided intake impellers via the rear air intake channel, while the upper air intake is solely connected to the front air intake channel, and there is no through-type channel for complementary airflow and pressure balance, the upper air intake must bear an independent and concentrated air intake task. Furthermore, due to the narrow slit structure of the upper air intake, when the dual-sided intake impellers rotate at high speed and generate strong suction, the airflow must quickly pass through the narrow slit area of ​​the upper air intake, causing a sharp increase in airflow velocity in that area, forming a localized strong airflow. According to fluid mechanics principles, when high-speed airflow flows within the narrow slit channel, it easily generates intense friction and eddies with the edge of the vent and the inner wall of the channel, thereby exciting air vibrations and producing a noticeable whistling sound. This whistling sound not only disrupts the quiet environment of the kitchen and affects the user's cooking experience, but may also lead users to misjudge that the range hood is malfunctioning, reducing their trust in the product. Furthermore, long-term strong local airflow and turbulence may also accelerate the wear and tear on components around the upper air intake, shortening the product's lifespan. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an air intake structure for a range hood that can avoid the whistling caused by excessively fast airflow velocity in the narrow slit at the top air inlet, in light of the above-mentioned existing technology.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a range hood air intake structure, including a lower air intake body, an air inlet guide plate installed on the top of the lower air intake body, a smoke guide plate provided below the air inlet guide plate, the lower air intake body having a lower panel, an upper air inlet formed between the rear edge of the smoke guide plate and the upper edge of the lower panel, a lower air inlet formed below the lower panel, and the lower air intake body having a vertical air intake channel. The lower air intake body is characterized in that: the rear side of the air inlet guide plate has an upper guide surface, the rear edge of the upper guide surface bends downward to form a rear guide surface, the lower edge of the rear guide surface bends forward and downward to form a lower guide surface, a lower ventilation hole is opened on the lower guide surface, and the lower air inlet is fluidly connected to the upper air inlet through the lower ventilation hole.

[0006] In order to allow the oil fume airflow flowing in from the upper air inlet to flow smoothly into the oil fume extraction fan, an upper ventilation hole connected to the upper air inlet is opened on the upper guide surface.

[0007] Preferably, the upper guide surface, the rear guide surface, and the lower guide surface form a U-shaped groove with an opening facing forward, and the rear edge of the smoke guide plate extends beyond the upper panel and into the U-shaped groove.

[0008] Further preferably, the projection of the rear edge of the smoke guide plate in the vertical direction is located in front of or behind the lower ventilation hole. This arrangement can prevent oil droplets on the smoke guide plate from penetrating the air inlet guide plate.

[0009] In order to fix the air inlet guide plate to the lower air inlet body, the leading edge of the lower guide surface is bent vertically downward to form a mounting surface. The mounting surface is located on the back side of the lower panel and fixed to the front panel of the lower air inlet body.

[0010] In order to enable the air outlet of the vertical air inlet channel to discharge air vertically upward, the rear guide surface is a vertical plane.

[0011] In order to form an airflow channel between the air inlet guide plate and the smoke guide plate, the upper guide surface is arranged to extend obliquely downward from front to back, and the smoke guide plate is arranged to extend obliquely downward from front to back.

[0012] To improve air intake efficiency, the upper airflow guide surface is parallel to the smoke guide plate.

[0013] In order to guide and filter the oil fumes flowing in from the lower air inlet, a guide plate is installed in the vertical air inlet channel. The guide plate has oil filter holes, which are located in the air duct between the lower air inlet and the lower ventilation hole.

[0014] To facilitate smoother air intake, the lower part of the guide plate has a guide surface that slopes downwards and forwards, and the guide surface is located behind the lower air inlet.

[0015] Compared with existing designs, the advantages of this utility model are as follows: the air intake structure of this range hood forms an upper air intake between the rear edge of the smoke guide plate and the upper edge of the lower plate, and a lower air intake is formed below the lower plate. The lower edge of the rear guide surface of the air intake guide plate bends forward and downward to form a lower guide surface. A lower ventilation hole is opened on the lower guide surface. The lower air intake is fluidly connected to the upper air intake through the lower ventilation hole. Since the upper air intake is relatively narrow, the airflow speed at the upper air intake can be reduced, avoiding whistling noise and improving the user experience. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the range hood according to an embodiment of the present utility model;

[0017] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the range hood.

[0018] Figure 3 for Figure 2 Enlarged view of section A;

[0019] Figure 4 for Figure 1 Another structural cross-sectional view of the range hood shown. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] like Figures 1 to 4 As shown, with Figure 2 The direction indicated by the middle arrow B is forward. The range hood in this embodiment includes an upper housing 8 and a lower air inlet 1 installed at the bottom of the upper housing 8. A range hood fan 9 is installed inside the upper housing 8. The rear of the lower air inlet 1 has a vertical air inlet channel 11. A lower panel 5 is installed on the front side of the vertical air inlet channel 11. A lower air inlet 6 is provided below the lower panel 5. The lower air inlet 6 is connected to the vertical air inlet channel 11. The oil entering from the lower air inlet 6 is drawn into the range hood fan 9 after passing through the vertical air inlet channel 11 and is finally discharged outward.

[0022] An air inlet guide plate 2 is installed on the top of the lower air inlet body 1. A smoke guide plate 3 is provided below the air inlet guide plate 2. An upper air inlet 5 is formed between the rear edge of the smoke guide plate 3 and the upper edge of the lower panel 4. In this embodiment, the air inlet gap of the upper air inlet 5 is 5mm to 15mm. In this embodiment, the rear side of the air inlet guide plate 2 has an upper guide surface 21. The rear edge of the upper guide surface 21 is bent downward to form a rear guide surface 22. The lower edge of the rear guide surface 22 is bent forward and downward to form a lower guide surface 23. The upper guide surface 21, the rear guide surface 22, and the lower guide surface 23 form a U-shaped groove 26 with an opening facing forward. The rear edge of the smoke guide plate 3 extends beyond the upper panel and into the U-shaped groove 26.

[0023] In this embodiment, the upper guide surface 21 extends obliquely downward from front to back, and the smoke guide plate 3 extends obliquely downward from front to back. Furthermore, the upper guide surface 21 and the smoke guide plate 3 are parallel to each other, so as to form an air inlet channel between the upper guide surface 21 and the smoke guide plate 3. The rear guide surface 22 is a vertical plane, so that the airflow in the vertical air inlet channel can be discharged vertically upward at the outlet, forming a straight exhaust effect.

[0024] The leading edge of the lower guide surface 23 is bent vertically downward to form the mounting surface 27. The mounting surface 27 is located on the back side of the lower panel 4 and fixed to the front plate 12 of the lower air inlet.

[0025] A lower ventilation hole 24 is formed on the lower guide surface 23, and the lower air inlet 6 is fluidly connected to the upper air inlet 5 through the lower ventilation hole 24. An upper ventilation hole 25 is formed on the upper guide surface 21, which is connected to the upper air inlet 5. In this embodiment, the projection of the rear edge of the smoke guide plate 3 in the vertical direction is located behind the lower ventilation hole 24, thereby preventing oil droplets on the smoke guide plate 3 from penetrating the air inlet guide plate 2. In addition, the projection of the rear edge of the smoke guide plate 3 in the vertical direction can also be located in front of the lower ventilation hole 24, that is, as long as the lower ventilation hole 24 is avoided.

[0026] A guide plate 7 is installed inside the vertical air inlet channel 11. The guide plate 7 has oil filter holes 71, which are located in the air duct between the lower air inlet 6 and the lower ventilation hole 24. The oil filter holes 71 guide and filter the oil fumes flowing in from the lower air inlet 6. In addition, the lower part of the guide plate 7 has a guide surface 72 that slopes forward from top to bottom. The guide surface 72 is located behind the lower air inlet 6 and guides the oil fumes, making the airflow of oil fumes smoother.

[0027] When the range hood is working, part of the oil fume airflow enters through the upper air inlet 5, and another part of the oil fume airflow enters the vertical air intake channel 11 through the lower air inlet 6. The oil fume airflow entering through the lower air inlet 6 can also be diverted by the air inlet guide plate 2. Most of the diverted airflow flows upward from the rear side of the rear guide surface 22 and is sucked into the range hood 9. The small part of the diverted airflow merges with the oil fume airflow flowing in from the upper air inlet 5 after passing through the lower ventilation hole 24. This can reduce the airflow velocity flowing in from the upper air inlet 5, thereby avoiding the whistling sound at the upper air inlet 5. The merged airflow is sucked into the range hood 9 through the upper ventilation hole 25.

[0028] In addition, the range hood can be controlled by a voice module, which is equipped with a control module, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the range hood to perform corresponding operations, thereby realizing intelligent control of the range hood and improving the user experience.

[0029] 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.

[0030] The term "fluid connectivity" as used in this utility model refers to the spatial relationship between two components or parts, collectively referred to as the first part and the second part, meaning that a fluid, gas, liquid, or a mixture of both can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. This third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. A range hood air intake structure, comprising a lower air intake body (1), wherein an air inlet guide plate (2) is installed on the top of the lower air intake body (1), a smoke guide plate (3) is provided below the air inlet guide plate (2), the lower air intake body (1) has a lower panel (4), an upper air inlet (5) is formed between the rear edge of the smoke guide plate (3) and the upper edge of the lower panel (4), a lower air inlet (6) is formed below the lower panel (4), and the lower air intake body (1) has a vertical air intake channel (11), characterized in that: The rear side of the air inlet guide plate (2) has an upper guide surface (21), the rear edge of the upper guide surface (21) bends downward to form a rear guide surface (22), the lower edge of the rear guide surface (22) bends forward and downward to form a lower guide surface (23), a lower ventilation hole (24) is opened on the lower guide surface (23), and the lower air inlet (6) is fluidly connected to the upper air inlet (5) through the lower ventilation hole (24).

2. The air intake structure of the range hood according to claim 1, characterized in that: An upper ventilation hole (25) communicating with the upper air inlet (5) is provided on the upper guide surface (21).

3. The air intake structure of the range hood according to claim 1, characterized in that: The upper guide surface (21), the rear guide surface (22) and the lower guide surface (23) form a U-shaped groove (26) with the opening facing forward. The rear edge of the smoke guide plate (3) extends over the upper panel and into the U-shaped groove (26).

4. The air intake structure of the range hood according to claim 3, characterized in that: The projection of the rear edge of the smoke guide plate (3) in the vertical direction is located in front of or behind the lower ventilation hole (24).

5. The air intake structure of the range hood according to claim 1, characterized in that: The leading edge of the lower guide surface (23) is bent vertically downward to form an mounting surface (27), which is located on the back side of the lower panel (4) and fixed on the front plate (12) of the lower air inlet.

6. The air intake structure of the range hood according to claim 1, characterized in that: The rear guide surface (22) is a vertical plane.

7. The air intake structure of the range hood according to claim 1, characterized in that: The upper guide surface (21) extends obliquely downward from front to back, and the smoke guide plate (3) extends obliquely downward from front to back.

8. The air intake structure of the range hood according to claim 7, characterized in that: The upper guide surface (21) is parallel to the smoke guide plate (3).

9. The range hood air intake structure according to any one of claims 1 to 8, characterized in that: A guide plate (7) is installed in the vertical air inlet channel (11). The guide plate (7) has an oil filter hole (71) located in the air duct between the lower air inlet (6) and the lower ventilation hole (24).

10. The air intake structure of the range hood according to claim 9, characterized in that: The lower part of the guide plate (7) has a guide surface (72) that slopes forward from top to bottom, and the guide surface (72) is located behind the lower air inlet (6).

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