Air inlet structure of range hood

Abstract

An air inlet structure of an extractor hood, the lower box body has a vertical air inlet channel inside, the lower box body is provided with a lower air inlet opening at the lower part of the front side and communicated with the vertical air inlet channel, a flow distribution plate is arranged at the top of the vertical air inlet channel, the flow distribution plate and the back plate of the lower box body form an air outlet of the vertical air inlet channel, the shortest vertical distance d1 between the flow distribution plate and the back plate of the lower box body, the front-rear width d2 between the front plate of the lower box body and the back plate of the lower box body and the vertical height d3 of the lower air inlet opening itself satisfy d1 < d3 ≤ d2. After the parameters d1, d2 and d3 of the air inlet structure of the extractor hood satisfy the above numerical relationship, on the one hand, the phenomenon that the oil fume flow entering from the lower air inlet opening increases in flow rate at the bottom corner of the vertical air inlet channel and collides with the box body can be avoided, and the noise can be reduced, on the other hand, the vertical straight exhaust channel can be constructed as a flow accelerating channel, the flow rate of the flow along the outlet direction of the channel gradually increases, which is beneficial to reduce the loss and improve the oil fume extraction effect.

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] Currently, range hoods on the market are mainly divided into two categories: top-mounted range hoods and low-position side-mounted range hoods. Top-mounted range hoods have their suction inlet located directly above the cooking area, relying on the negative pressure zone at the top to capture rising fumes, making them suitable for scenarios where fumes rise vertically in traditional Chinese cooking. However, these range hoods have the problem of being installed at a relatively high height. When the amount of fumes generated is large or the rising speed is fast, some fumes can easily escape from the sides, resulting in limited suction efficiency. Low-position side-mounted range hoods have their suction inlet close to the side of the cooking countertop, directly intercepting newly generated fumes through a low-position negative pressure zone, reducing the path of fume diffusion, and performing better in scenarios with a large amount of instantaneous fumes. However, due to the limitations of the side-mounted structure, their ability to capture upward-drifting fumes during cooking is weaker, especially when using a steamer and a wok alternately for cooking, which can easily lead to blind spots in fume capture.

[0003] To balance the fume extraction effects of the two types of range hoods mentioned above, existing technologies have also disclosed top-and-side dual-suction range hoods. For example, Chinese utility model patent No. 201620964850.8 (authorization announcement No. CN 206001578 U) discloses a high-volume range hood, which includes a body and a mask. The mask is located at the bottom of the body, with an upper air inlet at the top and a lower air inlet at the bottom, forming a lower air intake channel inside the mask. This allows fumes to be simultaneously drawn in through both the upper and lower air inlets, improving fume extraction. However, the lower air intake channel of this range hood is almost a straight cylindrical design. After entering the channel, the fumes passively flow only due to the negative pressure of the fan. There is no acceleration or guiding structure within the lower air intake channel, resulting in a rapid decrease in airflow velocity. Especially in scenarios with large amounts of oily fumes and complex compositions, insufficient flow rate can easily cause oil stains to accumulate on the inner walls of the channel. Long-term use will reduce the ventilation cross-sectional area and further reduce the smoke extraction efficiency. 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 accelerate airflow and improve the fume extraction effect, 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: an air intake structure for a range hood, including a lower housing, the lower housing having a vertical air intake channel inside, and a lower air inlet connected to the vertical air intake channel at the lower front side of the lower housing, characterized in that: a diverter plate is provided at the top of the vertical air intake channel, and the air outlet of the vertical air intake channel is formed between the diverter plate and the back plate of the lower housing, and the shortest vertical distance d1 between the diverter plate and the back plate of the lower housing, the front-to-back width d2 between the front plate and the back plate of the lower housing, and the vertical height d3 of the lower air inlet itself satisfy d1<d3≤d2.

[0006] To filter the oil fumes in the vertical air intake duct, an oil filter plate is installed inside the duct. The oil filter plate is located below the diverter plate and is arranged obliquely downwards from front to back. The oil filter plate has oil filter holes. The front-to-back length d4 of the oil filter holes, the vertical height d3 of the lower air intake itself, and the shortest vertical distance d1 between the diverter plate and the lower housing back plate satisfy d1≤d4≤d3. This arrangement creates an airflow acceleration channel.

[0007] To achieve a better airflow acceleration effect, the rear side of the diverter plate is a vertical plane and parallel to the back plate of the lower housing. The shortest vertical distance d1 between the rear side and the back plate of the lower housing, and the front-to-back width d2 between the front plate of the lower housing and the back plate of the lower housing satisfy 1.5d1 < d2 < 2.5d1.

[0008] Further optimization yields 2d1 = d2.

[0009] In order to divert the airflow from the vertical air inlet channel outlet and reduce the impact of the airflow on the diverter plate, the lower edge of the rear side of the diverter plate extends forward and downward to form a lower guide surface, and a lower ventilation hole is opened on the lower guide surface.

[0010] In order to fix the flow divider and the oil filter plate to the front plate of the lower housing, the leading edge of the lower guide surface has a flow divider mounting part that bends vertically downward, and the leading edge of the oil filter plate has an oil filter plate mounting part that bends vertically. Both the flow divider mounting part and the oil filter plate mounting part are fixed to the front plate of the lower housing.

[0011] In order to fix the oil filter plate to the back plate of the lower housing and form a flow guide structure at the bottom of the oil filter plate, the rear edge of the oil filter plate has a vertically downward extending lower mounting part of the oil filter plate. The lower mounting part of the oil filter plate is fixed to the back plate of the lower housing. The lower edge of the lower mounting part of the oil filter plate extends forward and downward to form a flow guide plate, and the flow guide plate is located directly behind the lower air inlet.

[0012] In order to enable the range hood to have both a lower air inlet and an upper air inlet to improve the smoke extraction effect, the front side of the lower housing has a lower panel, which is located above the lower air inlet. A smoke guide plate is provided above the front of the lower panel, and an upper air inlet is formed on the rear side of the smoke guide plate.

[0013] In order to allow the fumes flowing in from the lower air inlet to merge with the fumes flowing in from the upper air inlet, the smoke guide plate is inclined downward from front to back, and the upper air inlet is formed between the rear part of the smoke guide plate and the top of the lower panel. The lower ventilation hole is connected to the upper air inlet.

[0014] Further preferably, the upper edge of the rear side of the diverter plate extends forward and upward to form an upper guide surface. The rear side, lower guide surface, and upper guide surface of the diverter plate form a U-shaped groove with an opening facing forward. The rear edge of the smoke guide plate extends to the rear side of the lower panel and into the U-shaped groove. An upper ventilation hole is formed on the upper guide surface, and the upper ventilation hole is connected to the upper air inlet. With this configuration, the fumes entering from the upper air inlet can flow out through the upper ventilation hole. Extending the smoke guide plate rearward into the U-shaped groove also prevents the user from seeing the interior of the lower housing through the upper air inlet on the rear side of the smoke guide plate.

[0015] As a preferred embodiment of any of the above solutions, an upper housing is provided above the lower housing, and a fume extractor is installed inside the upper housing. The vertical air inlet channel is fluidly connected to the air inlet of the fume extractor.

[0016] Compared with existing designs, the advantages of this utility model are as follows: After the parameters d1, d2 and d3 of the range hood's air intake structure meet the set numerical relationship, on the one hand, it can avoid the phenomenon that the oil fume airflow entering from the lower air intake will increase in velocity at the bottom bend of the vertical air intake channel and collide with the box, thus reducing noise. On the other hand, the vertical exhaust channel can be constructed as an airflow acceleration channel, and the airflow velocity gradually increases along the channel outlet direction, which helps to reduce losses and improve the oil fume extraction effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the range hood according to an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the range hood.

[0019] Figure 3 for Figure 1 Another structural cross-sectional view of the range hood shown;

[0020] Figure 4 This is a schematic diagram of the structure of the diverter plate according to an embodiment of the present utility model;

[0021] Figure 5This is a schematic diagram of the structure of the oil filter plate in an embodiment of the present invention. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 5 As shown, the air intake structure of the range hood in this embodiment includes a lower housing 1, inside which is a vertical air intake channel 11, which serves as a direct exhaust channel for cooking fumes. A lower air inlet 12, connected to the vertical air intake channel 11, is located on the lower front side of the lower housing 1. An upper housing 7 is located above the lower housing 1, and a range hood 8 is installed inside the upper housing 7. The vertical air intake channel 11 and the air inlet of the range hood 8 are in fluid communication. The above structure can be referenced from existing range hoods and will not be described in detail here.

[0024] by Figure 2 The direction indicated by arrow A is forward. A diverter plate 2 is installed at the top of the vertical air intake channel 11, forming the air outlet of the vertical air intake channel 11 between the diverter plate 2 and the lower housing back plate 13. The rear side 21 of the diverter plate 2 is a vertical plane parallel to the lower housing back plate 13. Let the shortest vertical distance between the rear side 21 and the lower housing back plate 13 be d1, and the front-to-back width between the lower housing front plate 14 and the lower housing back plate 13 be d2, where d2 is the thickness of the lower housing 1. Then, d1 and d2 must satisfy 1.5d1 < d2 < 2.5d1. Therefore, due to the smaller diameter at the outlet of the vertical air intake channel 11, the vertical air intake channel 11 forms an airflow acceleration channel, increasing the airflow velocity and improving the fume extraction effect. Experiments show that when d2 = 2d1, the airflow velocity at the outlet of the vertical air intake channel 11 is relatively fast, resulting in better fume extraction.

[0025] Furthermore, assuming the vertical height of the lower air inlet 12 is d3, then d1, d2, and d3 satisfy d1 < d3 ≤ d2. Since d1 < d3, it ensures that the vertical air intake channel 11 can be constructed as an airflow acceleration channel. Additionally, since the fumes entering from the lower air inlet 12 will turn upwards at the bottom of the vertical air intake channel 11, the condition d3 ≤ d2 ensures that the fumes will not experience increased velocity and impact when turning, thus reducing noise and improving fume extraction. When d2 = d3, the thickness of the lower housing 1 and the vertical height of the lower air inlet 12 tend to be consistent, making the whole unit look more harmonious and aesthetically pleasing.

[0026] An oil filter plate 3 is installed inside the vertical air intake channel 11. The oil filter plate 3 is usually an oil filter screen, which can filter oil fumes and guide oil. The oil falling on the oil filter plate 3 eventually flows into the oil cup 9 at the bottom of the lower housing 1. The installation of an oil filter plate in the air intake channel is a conventional structure and will not be described in detail.

[0027] In this embodiment, the oil filter plate 3 is located below the flow divider plate 2 and is arranged obliquely downwards from front to back. The oil filter plate 3 has oil filter holes 31. Furthermore, the front-to-back length d4 of the oil filter holes 31, the vertical height d3 of the lower air inlet 12 itself, and the shortest vertical distance d1 between the flow divider plate 2 and the lower housing back plate 13 satisfy d1≤d4≤d3. Thus, even with the oil filter plate 3 installed, an airflow acceleration channel can still be constructed.

[0028] Combination Figure 4 As shown, the lower edge of the rear side surface 21 of the manifold 2 extends forward and downward to form a lower guide surface 22, on which a lower ventilation hole 221 is formed. The leading edge of the lower guide surface 22 has a manifold mounting part 23 that bends vertically downward, and the manifold mounting part 23 is fixed to the front plate 14 of the lower housing. The upper edge of the rear side surface 21 of the manifold 2 extends forward and upward to form an upper guide surface 24. The rear side surface 21, the lower guide surface 22, and the upper guide surface 24 of the manifold 2 form a U-shaped groove 25 with an opening facing forward.

[0029] Combination Figure 5 As shown, the oil filter plate 3 has an upwardly bent upper mounting portion 32 at its front edge and a downwardly extending lower mounting portion 33 at its rear edge. The upper mounting portion 32 is fixed to the front panel 14 of the lower housing, and the lower mounting portion 33 is fixed to the back panel 13 of the lower housing. The lower edge of the lower mounting portion 33 extends forward and downward to form a guide plate 34, which is located directly behind the lower air inlet 12. The guide plate 34 guides the oil fumes entering through the lower air inlet 12.

[0030] The lower housing 1 has a lower panel 4 on its front side. The lower panel 4 is a glass panel and is located above the lower air inlet 12. A smoke guide plate 5 is provided above the front of the lower panel 4. The smoke guide plate 5 is inclined downward from front to back, and an upper air inlet 6 is formed between the rear of the smoke guide plate 5 and the top of the lower panel 4. In this embodiment, the smoke guide plate 5 has upper air inlets on all four sides, that is, the smoke guide plate 5 is a ring plate. Oil fumes can enter the fume extraction fan 8 through the upper air inlets around the smoke guide plate 5, forming a ring effect. This works in conjunction with the lower air inlet 12 to form a downward suction and upward pull fume extraction effect.

[0031] In this embodiment, the rear edge of the smoke guide plate 5 extends to the rear side of the lower panel 4 and extends into the U-shaped groove 25. An upper ventilation hole 241 is opened on the upper guide surface 24. The upper ventilation hole 241 is connected to the upper air inlet 6 on the rear side of the smoke guide plate 5. After the oil fumes are drawn in from the upper air inlet 6, they enter the oil fume fan 8 through the upper ventilation hole 241.

[0032] In addition, such as Figure 2 and Figure 3As shown, the lower ventilation hole 221 on the diversion plate 2 is connected to the upper air inlet 6 and the upper ventilation hole 241. The oil fume airflow drawn in from the lower air inlet 12 passes through the oil filter hole 31 of the oil filter plate 3. Most of the airflow is accelerated through the vertical air inlet channel 11 and flows out from the air outlet of the vertical air inlet channel 11, and enters the oil fume fan 8. A small portion of the airflow passes through the lower ventilation hole 221 and the upper ventilation hole 241 in sequence before entering the oil fume fan 8. After setting the lower ventilation hole 221 on the lower guide surface 22 of the diversion plate 2, a portion of the accelerated oil fume airflow can be dispersed, and the airflow can be effectively prevented from directly impacting the diversion plate 2 from the front. This can reduce noise and improve the oil fume extraction effect. At the same time, it makes the lower air inlet 12 and the upper air inlet 6 on the rear side of the smoke guide plate 5 fluidly connected, avoiding the whistling sound caused by the narrow air inlet at the upper air inlet 6 on the rear side. In addition, the diverter plate 2 can separate the oil fume airflow that enters from the lower air inlet 12 and flows out through the air outlet of the vertical air inlet channel 11 from the oil fume airflow that enters from the upper air inlet 6, so as to avoid the two airflows interfering with each other and affecting the oil fume extraction effect.

[0033] 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.

[0034] 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.

[0035] 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, flow guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. An air intake structure for a range hood, comprising a lower housing (1), wherein the lower housing (1) has a vertical air intake channel (11) inside, and a lower air inlet (12) connected to the vertical air intake channel (11) is opened on the lower front side of the lower housing (1), characterized in that: The top of the vertical air inlet channel (11) is provided with a diverter plate (2), and the diverter plate (2) and the lower box back plate (13) form the air outlet of the vertical air inlet channel (11). The shortest vertical distance d1 between the diverter plate (2) and the lower box back plate (13), the front and rear width d2 between the lower box front plate (14) and the lower box back plate (13), and the vertical height d3 of the lower air inlet (12) itself satisfy d1<d3≤d2.

2. The air intake structure of the range hood according to claim 1, characterized in that: The vertical air inlet channel (11) is provided with an oil filter plate (3). The oil filter plate (3) is located below the diverter plate (2) and is arranged obliquely downward from front to back. The oil filter plate (3) has an oil filter hole (31). The front-to-back length d4 of the oil filter hole (31), the vertical height d3 of the lower air inlet (12) itself, and the shortest vertical distance d1 between the diverter plate (2) and the lower box back plate (13) satisfy d1≤d4≤d3.

3. The air intake structure of the range hood according to claim 2, characterized in that: The rear side (21) of the diverter plate (2) is a vertical plane and parallel to the lower box back plate (13). The shortest vertical distance d1 between the rear side (21) and the lower box back plate (13) and the front-to-back width d2 between the lower box front plate (14) and the lower box back plate (13) satisfy 1.5d1 < d2 < 2.5d1.

4. The air intake structure of the range hood according to claim 3, characterized in that: The lower edge of the rear side (21) of the diverter plate (2) extends forward and downward to form a lower guide surface (22), and a lower ventilation hole (221) is opened on the lower guide surface (22).

5. The air intake structure of the range hood according to claim 4, characterized in that: The lower guide surface (22) has a vertically downward bent diverter plate mounting part (23) at its leading edge, and the oil filter plate (3) has a vertically bent oil filter plate mounting part (32) at its leading edge. Both the diverter plate mounting part (23) and the oil filter plate mounting part (32) are fixed on the front plate (14) of the lower housing.

6. The air intake structure of the range hood according to claim 5, characterized in that: The oil filter plate (3) has a vertically downward extending lower mounting part (33) at its rear edge. The lower mounting part (33) is fixed on the back plate (13) of the lower housing. The lower edge of the lower mounting part (33) extends forward and downward to form a guide plate (34), and the guide plate (34) is located directly behind the lower air inlet (12).

7. The air intake structure of the range hood according to claim 4, characterized in that: The lower housing (1) has a lower panel (4) on its front side. The lower panel (4) is located above the lower air inlet (12). A smoke guide plate (5) is provided above the front of the lower panel (4). An upper air inlet (6) is formed on the rear side of the smoke guide plate (5).

8. The air intake structure of the range hood according to claim 7, characterized in that: The smoke guide plate (5) is inclined downward from front to back, and the upper air inlet (6) is formed between the rear part of the smoke guide plate (5) and the top of the lower panel (4). The lower ventilation hole (221) is connected to the upper air inlet (6).

9. The air intake structure of the range hood according to claim 8, characterized in that: The upper edge of the rear side (21) of the diverter plate (2) extends forward and upward to form an upper guide surface (24). The rear side (21), lower guide surface (22) and upper guide surface (24) of the diverter plate (2) form a U-shaped groove (25) with an opening facing forward. The rear edge of the smoke guide plate (5) extends to the rear side of the lower panel (4) and extends into the U-shaped groove (25). An upper ventilation hole (241) is opened on the upper guide surface (24), and the upper ventilation hole (241) is connected to the upper air inlet (6).

10. The air intake structure of the range hood according to any one of claims 1 to 9, characterized in that: An upper box (7) is provided above the lower box (1), and an oil fume fan (8) is installed inside the upper box (7). The vertical air inlet channel (11) is fluidly connected to the air inlet of the oil fume fan (8).

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