Range hood

Abstract

The utility model relates to a range hood which can form an annular cyclone by utilizing the interaction between oil fume airflow and air supplement airflow, so that oil fume which is easy to escape can be better captured, and the oil fume suction effect is improved. The range hood comprises a fan box; the smoke collecting cavity comprises a top cavity body which is positioned below the fan box and is communicated with the fan box; the top cavity comprises a transverse shell connected with the fan box and provided with a bottom opening, a butterfly wing plate body arranged on the transverse shell to partially cover the bottom opening, a left side flow guide plate extending downwards from the left side wall of the transverse shell and a right side flow guide plate extending downwards from the right side wall of the transverse shell. The left end and the right end of the butterfly wing plate body and the left side wall and the right side wall of the transverse shell are arranged at intervals, so that a left smoke inlet adjacent to the left flow guide plate and a right smoke inlet adjacent to the right flow guide plate are formed in the left side and the right side of the butterfly wing plate body.

Description

Technical Field

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

[0002] With the improvement of people's quality of life, range hoods have gradually become an indispensable appliance in the kitchen. They are usually installed above the kitchen stove and can absorb the fumes generated during the cooking process, thereby purifying the kitchen environment and improving people's comfort when cooking.

[0003] Some existing range hoods use a butterfly-wing ring-suction air intake method, which mainly uses a butterfly plate to expand the negative pressure area, so that the negative pressure area spreads from the middle to the surrounding areas, and then smoke is drawn from all sides to achieve the purpose of absorbing oil fumes; in addition, some range hoods also use a liftable butterfly plate, which lowers the negative pressure area by lowering the butterfly plate, so that the negative pressure area is closer to the stove to improve the efficiency of oil fume extraction.

[0004] However, although this type of range hood can diffuse the negative pressure area through the butterfly plate to increase the range of oil fume suction, it will cause the negative pressure in the negative pressure area to be relatively reduced due to dispersion, resulting in a certain amount of oil fume still escaping from the area under the butterfly plate; especially after the butterfly plate is lowered, the negative pressure in the negative pressure area will be further reduced, which is easy to release pressure, resulting in a greater risk of oil fume escape. Utility Model Content

[0005] In view of the risk of oil smoke escaping from existing range hoods with butterfly panels, the present application provides a range hood that can utilize the interaction between the oil smoke airflow and the supply airflow to form an annular cyclone, thereby better capturing the oil smoke that is easy to escape and improving the oil smoke extraction effect.

[0006] In order to achieve at least one of the above-mentioned advantages or other advantages and purposes of the present application, the present application provides a range hood, comprising: a fan box; and a smoke collection chamber, comprising a top cavity located below the fan box and connected to the fan box; the top cavity comprises a transverse shell connected to the fan box and having a bottom opening, a butterfly plate body arranged on the transverse shell to partially cover the bottom opening, a left guide plate extending downward from the left side wall of the transverse shell, and a right guide plate extending downward from the right side wall of the transverse shell; the left and right ends of the butterfly plate body are respectively spaced apart from the left and right side walls of the transverse shell to form a left smoke inlet adjacent to the left guide plate and a right smoke inlet adjacent to the right guide plate on the left and right sides of the butterfly plate body.

[0007] In one embodiment of the present application, the width of the left smoke inlet and / or the right smoke inlet is between 5 mm and 30 mm.

[0008] In one embodiment of the present application, the smoke collecting chamber further comprises a side cavity extending downward from the rear of the top cavity; a side smoke inlet communicating with the fan box is provided at the lower portion of the side cavity.

[0009] In one embodiment of the present application, the lower edge of the left guide plate and / or the right guide plate is located between the lower surface of the butterfly plate body and the upper edge of the side smoke inlet.

[0010] In one embodiment of the present application, a longitudinal distance between a lower edge of the left guide plate and / or the right guide plate and a lower surface of the butterfly plate body is between 10 mm and 100 mm.

[0011] In one embodiment of the present application, the front end of the butterfly plate body is spaced apart from the front side wall of the transverse shell to form a front smoke inlet connected to the fan box on the front side of the butterfly plate body; the rear end of the butterfly plate body is spaced apart from the transverse shell to form a rear smoke inlet connected to the fan box on the rear side of the butterfly plate body.

[0012] In one embodiment of the present application, the top cavity further includes a flow guide cover body arranged between the transverse shell and the butterfly plate body and having a plurality of flow guide holes; the periphery of the flow guide cover body is fixedly connected to the transverse shell, the butterfly plate body is built into the flow guide cover body, and an annular gap connected to the flow guide holes is formed between the periphery of the butterfly plate body and the flow guide cover body to serve as a ring-shaped smoke inlet.

[0013] In one embodiment of the present application, the butterfly plate body extends obliquely downward from front to back; the sinking depth of the front end of the butterfly plate body in the air deflector body is between 10 mm and 100 mm.

[0014] In one embodiment of the present application, the side cavity includes a longitudinal shell connected to the transverse shell and having a front opening, and a front panel arranged on the longitudinal shell to partially cover the front opening; the lower edge of the front panel is spaced apart from the bottom wall of the longitudinal shell to form a strip hole serving as the side smoke inlet; the upper edge of the front panel is spaced apart from the butterfly plate body.

[0015] In one embodiment of the present application, the top cavity further includes a diverter plate body, wherein the upper edge of the diverter plate body is fixedly connected to the guide cover body, and the lower edge of the diverter plate body is close to the rear side of the front panel; the diverter plate body extends obliquely forward and downward from the rear edge of the guide cover body to the rear side of the front panel; the diverter plate body is provided with a plurality of noise reduction holes distributed at intervals.

[0016] In summary, since the left side guide plate and the right side guide plate extend downward from the left and right side walls of the transverse shell respectively, the lower edges of the left side guide plate and the right side guide plate are both below the butterfly plate body, and the butterfly plate body and the transverse shell define a left smoke inlet adjacent to the left side guide plate and a right smoke inlet adjacent to the right side guide plate. Therefore, based on the above structure, the left side guide plate and the right side guide plate can effectively move the negative pressure area corresponding to the left smoke inlet (i.e., the left negative pressure area) and the negative pressure area corresponding to the right smoke inlet (i.e., the right negative pressure area) downward, thereby allowing the fresh air flow (i.e., the cold air flow) coming in from the outside of the left side guide plate and the right side guide plate and the oil smoke flow (i.e., the hot air flow) generated during cooking to rise toward the left smoke inlet and the right smoke inlet, respectively, to interact with each other on the inner side of the left side guide plate and the right side guide plate, thereby forming a low-pressure annular cyclone in the lower inner area of ​​the left side guide plate and the right side guide plate, respectively.

[0017] It should be understood that since the annular cyclone formed on the inner side of the left guide plate and the right guide plate is a low-pressure cyclone, and the air pressure on the outer side of the left guide plate and the right guide plate is normal pressure, the supply air flow will be forced to accelerate and continuously flow into the inner area of ​​the left guide plate and the right guide plate, thereby preventing the possibility of oil smoke on both sides escaping outward during the upward rising process, thereby improving the oil smoke absorption effect; at the same time, since the temperature of the supply air flow is lower than the temperature of the oil smoke hot air flow, the low-pressure annular cyclone formed can make the rising oil smoke hot air flow mix with the supply air flow to cool down and be quickly sucked away, thereby reducing the risk of oil smoke adhering to the left guide plate and the right guide plate to form condensed oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective schematic diagram of a range hood according to an embodiment of the present application;

[0019] Figure 2 A schematic cross-sectional view of the range hood according to the above embodiment of the present application along the front-to-back direction is shown;

[0020] Figure 3 Shown Figure 2 An enlarged schematic diagram of a part A of the range hood shown;

[0021] Figure 4 A schematic cross-sectional view of the range hood according to the above embodiment of the present application along the left and right directions is shown;

[0022] Figure 5 Shown Figure 4 An enlarged schematic diagram of a part B of the range hood shown;

[0023] Figure 6A schematic structural diagram of the range hood according to the above embodiment of the present application is shown after the butterfly plate is removed;

[0024] Figure 7 A schematic structural diagram of the air guide cover in the range hood according to the above embodiment of the present application is shown;

[0025] Figure 8 A schematic diagram of the oil smoke paths on the left and right sides of the range hood according to the above embodiment of the present application is shown;

[0026] Figure 9 A schematic diagram of the oil smoke paths on the front and rear sides of the range hood according to the above embodiment of the present application is shown.

[0027] Description of main component symbols:

[0028] 10. Fan box; 11. Box body; 111. Front air inlet channel; 112. Rear air inlet channel; 12. Fan; 20. Smoke collection chamber; 21. Top chamber; 2101. Left smoke inlet; 2102. Right smoke inlet; 2103. Front smoke inlet; 2104. Rear smoke inlet; 211. Horizontal housing; 2110. Bottom opening; 212. Butterfly wing plate; 2121. Light-transmitting area; 2122. Baffle Smoke area; 213, air guide cover body; 2130, air guide hole; 2131, fixing ring; 2132, mounting groove; 2133, air guide groove; 214, light board; 215, diverter plate body; 2150, noise reduction hole; 216, left air guide plate; 217, right air guide plate; 22, side cavity; 220, side smoke inlet; 221, longitudinal shell; 2210, front opening; 222, front panel.

[0029] The above description of the main component symbols is combined with the accompanying drawings and specific implementation methods to further illustrate this application in detail. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0033] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0034] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0036] Considering that existing range hoods can diffuse the negative pressure zone from the central area to the surrounding area through the butterfly plate to expand the range of oil smoke absorption, the negative pressure in the negative pressure zone will be relatively reduced due to dispersion, resulting in a certain amount of oil smoke escaping from the area below the butterfly plate. In particular, after the butterfly plate is lowered, the negative pressure in the negative pressure zone will be further reduced, which will easily release the pressure and increase the risk of oil smoke escaping. Therefore, the present application creatively provides a range hood that can use the interaction between the oil smoke airflow and the supply airflow to form an annular cyclone, better capture the oil smoke that is easy to escape, and improve the oil smoke absorption effect.

[0037] Specifically, if Figures 1 to 9 As shown, one embodiment of the present application provides a range hood, which may include a fan housing 10 and a smoke collection chamber 20 connected to the fan housing 10, so that the smoke collection chamber 20 absorbs oil smoke under the negative pressure of the fan housing 10. It is understood that the range hood of the present application may also include, but is not limited to, a control panel, a water tank, or a water collection box to assist in completing the oil smoke extraction function, and this application will not elaborate on these details.

[0038] More specifically, if Figures 1 to 3 As shown, the smoke collecting chamber 20 includes a top cavity 21 located below the fan box 10 and connected to the fan box 10; the top cavity 21 includes a transverse shell 211 connected to the fan box 10 and having a bottom opening 2110, a butterfly plate body 212 arranged on the transverse shell 211 to partially cover the bottom opening 2110, a left guide plate 216 extending downward from the left side wall of the transverse shell 211, and a right guide plate 217 extending downward from the right side wall of the transverse shell 211; the left and right ends of the butterfly plate body 212 are respectively spaced apart from the left and right side walls of the transverse shell 211 to form a left smoke inlet 2101 adjacent to the left guide plate 216 and a right smoke inlet 2102 adjacent to the right guide plate 217 on the left and right sides of the butterfly plate body 212. It can be understood that the downward extension mentioned in this application is not absolutely vertically downward, but can also be inclined downward at a certain slope, and the specific slope can be adjusted based on the actual oil fume scene.

[0039] It is worth noting that Figure 8As shown, since the left guide plate 216 and the right guide plate 217 extend downward from the left and right side walls of the horizontal shell 211 respectively, the lower edges of the left guide plate 216 and the right guide plate 217 are both below the butterfly plate body 212, and the butterfly plate body 212 and the horizontal shell 211 define a left smoke inlet 2101 adjacent to the left guide plate 216 and a right smoke inlet 2102 adjacent to the right guide plate 217, so the left guide plate 216 and the right guide plate 217 can effectively transfer the negative pressure corresponding to the left smoke inlet 2101 to the left smoke inlet 2102. The negative pressure area (i.e., the left negative pressure area) and the negative pressure area (i.e., the right negative pressure area) corresponding to the right smoke inlet 2102 move downward, and then the air supply airflow (i.e., the cold airflow) coming in from the outside of the left guide plate 216 and the right guide plate 217 and the oil smoke airflow (i.e., the hot airflow) generated during cooking rise toward the left smoke inlet 2101 and the right smoke inlet 2102, respectively. In the process, interaction occurs on the inner side of the left guide plate 216 and the right guide plate 217, thereby forming a low-pressure annular cyclone in the lower inner area of ​​the left guide plate 216 and the right guide plate 217, respectively.

[0040] It should be understood that since the annular cyclone formed on the inner side of the left guide plate 216 and the right guide plate 217 is a low-pressure cyclone, and the air pressure on the outer side of the left guide plate 216 and the right guide plate 217 is normal pressure, the supply air flow will be forced to accelerate and continuously flow into the inner area of ​​the left guide plate 216 and the right guide plate 217, thereby preventing the possibility of oil smoke on both sides escaping outward during the upward rising process, thereby improving the oil smoke absorption effect; at the same time, since the temperature of the supply air flow is lower than the temperature of the oil smoke hot air flow, the low-pressure annular cyclone formed can make the rising oil smoke hot air flow mix with the supply air flow to cool down and be quickly sucked away, thereby reducing the risk of oil smoke adhering to the left guide plate 216 and the right guide plate 217 to form condensed oil.

[0041] In addition, the top smoke inlet of a conventional range hood with a large top opening is usually located in the middle area. Even if downward-extending guide plates are provided on the left and right sides to collect smoke, the distance between the guide plates and the top smoke inlet is relatively far, and the main rising path of the smoke is to gather in the middle area and rise upward. During the upward rising process, the small amount of smoke that escapes is difficult to gather on the inner side of the guide plate to form a low-pressure annular cyclone; therefore, there is still a possibility that the smoke will escape, and the smoke extraction effect is still poor.

[0042] For example, Figure 2 and Figure 3As shown, the left guide plate 216 and the right guide plate 217 can also be fixedly connected to the left and right side walls of the transverse shell 211. Of course, in other examples of the present application, the left guide plate 216 and the right guide plate 217 can be fixedly connected to the top wall of the transverse shell 211.

[0043] Preferably, if Figure 3 As shown, the width d of the left smoke inlet 2101 is between 5mm and 30mm, that is, 5mm≤d≤30mm; so that a narrow gap is formed between the left end of the butterfly plate body 212 and the left guide plate 216, so that the wind speed at the left smoke inlet 2101 can be increased through the narrow gap, which helps to increase the negative pressure and improve the oil fume extraction effect; at the same time, the range hood of the present application can better expand the left negative pressure area by reducing the width of the left narrow gap as much as possible.

[0044] Similarly, the width of the right smoke inlet 2102 can also be between 5mm and 30mm, so that a narrow gap is formed between the right end of the butterfly plate body 212 and the right guide plate 217, so as to increase the wind speed at the right smoke inlet 2102 through the narrow gap, which helps to increase the negative pressure and improve the oil fume extraction effect; at the same time, the range hood of the present application can better expand the right negative pressure area by reducing the width of the narrow gap on the right as much as possible.

[0045] It is understandable that if the width of the left smoke inlet 2101 and / or the right smoke inlet 2102 is too small, such as less than 5 mm, the smoke inlet will not be able to accommodate a large amount of oil smoke entering at the same time, the airflow resistance will increase, the air volume will decrease, and thus the suction force will decrease; in addition, a gap that is too narrow is very easy to be completely or partially blocked by impurities (especially condensed grease), which will also affect the air intake efficiency; in addition, high-speed airflow is prone to produce unstable phenomena such as howling or turbulence when passing through an extremely narrow gap, resulting in a significant increase in noise, affecting the user's experience; and if the width of the left smoke inlet 2101 and / or the right smoke inlet 2102 is too large, such as greater than 30 mm, the negative pressure area will become dispersed and shifted toward the central area as a whole, thereby weakening the effect of the interaction between cold and hot airflows and making it difficult to form a low-pressure annular cyclone; or even if a low-pressure annular cyclone can be formed, the oil smoke escape prevention capability is relatively poor.

[0046] According to the above embodiments of the present application, Figures 1 to 9As shown, the smoke collecting chamber 20 may also include a side cavity 22 extending downward from the rear of the top cavity 21, and a side suction smoke inlet 220 connected to the fan box 10 is opened at the lower part of the side cavity 22, so that the side suction smoke inlet 220 is close to the stove, so as to capture the oil smoke in the early stage of rising, so that the oil smoke with a smaller cross-section is closer to the wall side (that is, close to the side cavity 22), a part of the oil smoke enters the range hood through the side suction smoke inlet 220, and the remaining oil smoke rises to the top cavity 21 close to the wall side, so as to capture the remaining oil smoke through the left smoke inlet 2101 and the right smoke inlet 2102 in the later stage of oil smoke rising under the guiding action of the left guide plate 216 and the right guide plate 217, so as to prevent the oil smoke with a larger cross-section from escaping from the left and right sides. It can be understood that the range hood of the present application is usually installed on a wall, and the fan box 10 and the side cavity 22 are arranged close to the wall.

[0047] Preferably, if Figure 2 and Figure 8 As shown, the lower edge of the left side deflector 216 is located between the lower surface of the butterfly plate 212 and the upper edge of the side smoke inlet 220, so that the lower edge of the left side deflector 216 is higher than the upper edge of the side smoke inlet 220. This ensures that the cold air flow from the outside of the left side deflector 216 can collide with the rising oil smoke, forming an annular airflow inside the left side deflector 216 to enhance the oil smoke absorption effect. It is understood that if the lower edge of the left side deflector 216 is lower than the upper edge of the side smoke inlet 220, the cold air flow from the outside of the left side deflector 216 will be captured by the side smoke inlet 220 and will not collide with the rising oil smoke, making it difficult to form an annular airflow inside the left side deflector 216 to enhance the oil smoke absorption effect.

[0048] Similarly, if Figure 2 、 Figure 8 as well as Figure 9 As shown, the lower edge of the right side guide plate 217 is also located between the lower surface of the butterfly plate body 212 and the upper edge of the side smoke intake port 220, so that the lower edge of the right side guide plate 217 is higher than the upper edge of the side smoke intake port 220, ensuring that the cold air flow replenished from the outside of the right side guide plate 217 can collide with the rising oil smoke to form an annular airflow on the inner side of the right side guide plate 217 to enhance the oil smoke absorption effect.

[0049] More preferably, if Figure 3As shown, the longitudinal distance h between the lower edge of the left guide plate 216 and the lower surface of the butterfly plate body 212 is between 10 mm and 100 mm, that is, 10 mm ≤ h ≤ 100 mm; that is, the distance that the left guide plate 216 extends downward relative to the lower surface of the butterfly plate body 212 is greater than or equal to 10 mm and less than or equal to 100 mm, so as to effectively move the left negative pressure area downward to form a left annular cyclone that locks the oil smoke path, while not affecting the user's movement to the left or taking and placing cooking utensils from the left.

[0050] Similarly, the longitudinal distance between the lower edge of the right side guide plate 217 and the lower surface of the butterfly plate body 212 can also be between 10 mm and 100 mm, that is, the distance that the right side guide plate 217 extends downward relative to the lower surface of the butterfly plate body 212 is greater than or equal to 10 mm and less than or equal to 100 mm, so as to effectively move the right side negative pressure area downward to form a right side annular cyclone that locks the oil smoke path, without affecting the user's movement to the right or taking and placing cooking utensils from the right side.

[0051] It is worth noting that in the above embodiments of the present application, Figure 4 As shown, the front end of the butterfly plate body 212 is spaced apart from the front side wall of the transverse shell 211 to form a front smoke inlet 2103 connected to the fan box 10 on the front side of the butterfly plate body 212, so that the oil smoke rising upward can be captured by the front smoke inlet 2103 on the front side of the butterfly plate body 212, preventing the oil smoke from escaping from the front side of the range hood.

[0052] In addition, if Figure 4 and Figure 5 As shown, the rear end of the butterfly plate body 212 is spaced apart from the transverse shell 211 to form a rear smoke inlet 2104 on the rear side of the butterfly plate body 212 that is connected to the fan box 10. This not only captures the upward rising smoke on the rear side of the butterfly plate body 212, but also forms a backward pulling force on the upward rising smoke to prevent the smoke from spreading and escaping outward.

[0053] Preferably, if Figure 8 and Figure 9 As shown, the left smoke inlet 2101, the front smoke inlet 2103, the right smoke inlet 2102 and the rear smoke inlet 2104 are connected end to end in sequence to form a ring-shaped smoke inlet around the butterfly plate 212, which is beneficial to increase the wind speed value around the butterfly plate 212 and increase the negative pressure so as to quickly capture the oil smoke.

[0054] For example, Figures 2 to 7As shown, the top cavity 21 further includes a guide cover body 213 arranged between the transverse shell body 211 and the butterfly plate body 212 and provided with a plurality of guide holes 2130; the periphery of the guide cover body 213 is fixedly connected to the transverse shell body 211, the butterfly plate body 212 is built into the guide cover body 213, and an annular gap connected to the plurality of guide holes 2130 is formed between the periphery of the butterfly plate body 212 and the guide cover body 213 to serve as the annular smoke inlet, further improving the wind speed at the annular smoke inlet, so as to form a guide channel between the guide cover body 213 and the butterfly plate body 212 to connect the annular smoke inlet and the guide holes 2130 and with a larger oil smoke flow rate, so that the oil smoke quickly captured through the annular smoke inlet first flows quickly to the plurality of guide holes 2130 through the guide channel, and then flows to the fan box 10 through the plurality of guide holes 2130. It is understandable that if the deflector body 213 is not provided, not only will the installation difficulty of the butterfly plate body 212 increase, but the flow rate of the oil smoke captured through the annular smoke inlet will decay rapidly, resulting in a decrease in negative pressure, which is not conducive to the effective capture of oil smoke and is prone to the problem of oil smoke escape.

[0055] For example, Figure 4 and Figure 5 As shown, the gap between the front end of the butterfly plate body 212 and the deflector body 213 forms the front smoke inlet 2103 ; the gap between the rear end of the butterfly plate body 212 and the deflector body 213 forms the rear smoke inlet 2104 .

[0056] Preferably, if Figure 4 and Figure 9 As shown, the width of the front smoke inlet 2103 is between 5mm and 30mm, so that a narrow gap is formed between the front end of the butterfly plate body 212 and the air guide cover body 213, so that the wind speed at the front smoke inlet 2103 can be increased through the narrow gap, which helps to increase the negative pressure and improve the oil fume extraction effect; at the same time, the range hood of the present application can better expand the front negative pressure area by reducing the width of the front narrow gap as much as possible.

[0057] Alternatively, as Figure 4 and Figure 9 As shown, the butterfly plate 212 extends downward from front to back, so that the rear smoke inlet 2104 is located below and to the side of the front smoke inlet 2103. This ensures that the rear smoke inlet 2104 can contact the oil smoke earlier, thereby generating a pulling force on the rear side of the butterfly plate 212 to prevent the oil smoke from spreading outward, thereby improving the oil smoke absorption effect. For example, the horizontal inclination angle of the butterfly plate 212 can be between 5° and 30°.

[0058] More preferably, the front end of the butterfly plate 212 is sunk into the air guide cover 213 at a depth of 10 mm to 100 mm, so as to effectively move the front negative pressure area downward to form a front annular cyclone that locks the oil smoke path, thereby avoiding the problem of oil smoke escaping from the front and hitting the face, while not affecting the user's field of vision during cooking, and facilitating the operation and / or placement of cooking utensils.

[0059] Alternatively, as Figures 4 to 7 As shown, the air guide cover body 213 has a fixing ring portion 2131 close to the butterfly plate body 212 for fixed connection with the butterfly plate body 212, a mounting groove portion 2132 protruding from the inner periphery of the fixing ring portion 2131 toward a direction away from the butterfly plate body 212, and a guide groove portion 2133 protruding from the outer periphery of the fixing ring portion 2131 toward a direction away from the butterfly plate body 212; the guide hole 2130 is located in the guide groove portion 2133 to be hidden above the butterfly plate body 212, so that the oil smoke captured through the ring smoke inlet first flows from the four sides of the butterfly plate body 212 to the middle, and then flows out from the guide hole 2130, so as to further increase the flow rate of the oil smoke in the guide channel; at the same time, the guide hole 2130 can also be covered by the butterfly plate body 212 within the visible range to beautify the appearance of the product.

[0060] Preferably, if Figure 6 and Figure 7 As shown, the guide hole 2130 is implemented as a rectangular hole, and the rectangular holes are arranged in the guide groove portion 2133 of the guide cover body 213 in a short-side to short-side manner, so as to avoid the rectangular hole extending out of the periphery of the butterfly plate body 212 while ensuring that the rectangular hole has a sufficiently large flow area.

[0061] More preferably, if Figure 4 、 Figure 6 as well as Figure 7 As shown, the guide hole 2130, which is respectively connected to the front smoke inlet 2103, the left smoke inlet 2101 and the right smoke inlet 2102, is located on the inner groove wall of the guide groove portion 2133 to guide the oil smoke to flow toward the middle and away from the side wall of the horizontal shell 211, which is beneficial to reduce the oil stains accumulated on the horizontal shell 211.

[0062] It is worth noting that Figures 2 to 6As shown, the fan box 10 may include a box body 11 and a fan 12; wherein the fan 12 is disposed within the box body 11, forming a front air passage 111 communicating with the front air inlet of the fan 12 and a rear air inlet passage 112 communicating with the rear air inlet of the fan 12. The side smoke inlet 220 of the side cavity 22 and the left smoke inlet 2101, right smoke inlet 2102, and rear smoke inlet 2104 of the top cavity 21 are connected to the rear air inlet passage 112 of the fan box 10. The front smoke inlet 2103 of the top cavity 21 is connected to the front air passage 111 of the fan box 10. In other words, the front and rear ends of the circular smoke inlet composed of the left smoke inlet 2101, the right smoke inlet 2102, the front smoke inlet 2103 and the rear smoke inlet 2104 are respectively close to the front air inlet channel 111 and the rear air inlet channel 112 of the fan box 10.

[0063] In addition, if Figure 4 、 Figure 5 as well as Figure 6 As shown, the guide hole 2130 connected to the rear smoke inlet 2104 is located at the bottom of the guide groove 2133 to guide the oil smoke captured through the rear smoke inlet 2104 to flow directly into the rear air inlet channel 112 when flowing out from the corresponding guide hole 2130, so as to reduce the number of turns of the oil smoke and reduce the flow resistance of the oil smoke.

[0064] Preferably, if Figure 4 and Figure 9 As shown, the flow rate Qb of the rear air inlet channel 112 is more than three times the flow rate Qa of the front air inlet channel 111, that is, Qb ≥ 3Qa. It is understandable that the flow rate Qb of the rear air inlet channel 112 and the flow rate Qa of the front air inlet channel 111 can be distributed according to the main and auxiliary air inlets of the fan 12, that is, the rear air inlet of the fan 12 is the main air inlet of the fan 12, and the front air inlet of the fan 12 is the auxiliary air inlet of the fan 12.

[0065] In this way, Figure 9 As shown, although the cross-section of the oil smoke continues to increase during the rising process, the range hood of the present application can, without the side suction smoke shield being opened to expand the negative pressure area, make the side suction smoke inlet 220 located at the lower part of the side cavity 22 close to the stove (that is, closer to the oil smoke), so as to capture the oil smoke in the early stage of rising oil smoke, and make the oil smoke with a smaller cross-section as a whole close to the wall side (that is, close to the side cavity 22), wherein a part of the oil smoke enters the range hood through the side suction smoke inlet 220, and the remaining oil smoke rises to the top cavity 21 close to the wall side, so as to capture the remaining oil smoke in the later stage of rising oil smoke through the left smoke inlet 2101, the right smoke inlet 2102, the front smoke inlet 2103 and the rear smoke inlet 2104, so as to prevent the oil smoke with a larger cross-section from escaping.

[0066] It is worth noting that, since the side smoke inlet 220, the left smoke inlet 2101, the right smoke inlet 2102 and the rear smoke inlet 2104 are connected to the rear air inlet channel 112, the front smoke inlet 2103 is connected to the front air inlet channel 111, and the flow rate Qb of the rear air inlet channel 112 is more than three times the flow rate Qa of the front air inlet channel 111, the range hood of the present application allocates the front air volume of the fan 12 that accounts for less than one-quarter of the total air volume to the front smoke inlet 2103, and allocates the rear air volume of the fan 12 that accounts for more than three-quarters of the total air volume to the side smoke inlet 220, the left smoke inlet 2101 and the rear smoke inlet 2104. The smoke outlet 2101, the right smoke inlet 2102 and the rear smoke inlet 2104 are arranged to ensure that the side suction smoke inlet 220 of the side cavity 22 can pull the oil smoke with a smaller cross-section (the oil smoke is initially in a concentrated and undiffused state) to the wall side as a whole and capture about half (actually measured more than half) of the oil smoke at the initial stage of oil smoke rising; at the same time, although the remaining oil smoke will diffuse to the surroundings during the upward rising process, the present application can use the annular suction smoke inlet of the top cavity 21 to capture the remaining oil smoke with a larger cross-section in a full-area manner in an annular suction manner, thereby achieving a multi-point smoke control effect of pulling down and annular suction, and obtaining a better oil smoke suction effect to prevent oil smoke from escaping.

[0067] In other words, the range hood of the present application allocates the front air volume of the fan 12, which accounts for less than one-quarter of the total air volume, to the front smoke inlet 2103, so that the smoke volume Q3 of the front smoke inlet 2103 is basically equal to the flow rate Qa of the front air flow channel 111, that is, Qa≈Q3; at the same time, the range hood of the present application allocates the rear air volume of the fan 12, which accounts for more than three-quarters of the total air volume, to the rear smoke inlet 2104, the left smoke inlet 2101, the right smoke inlet 2102 and the side suction smoke inlet 220, so that the sum of the smoke volume Q4 of the rear smoke inlet 2104, the smoke volume Q1 of the left smoke inlet 2101, the smoke volume Q2 of the right smoke inlet 2102 and the smoke volume Q5 of the side suction smoke inlet 220 is basically equal to the flow rate Qb of the rear air flow channel 112, that is, Qb≈Q1+Q2+Q4+Q5.

[0068] Preferably, the amount of smoke Q5 from the side smoke inlet 220 is greater than the amount of smoke Q3 from the front smoke inlet 2103; the amount of smoke Q4 from the rear smoke inlet 2104 is less than the amount of smoke Q3 from the front smoke inlet 2103; the amount of smoke Q1 from the left smoke inlet 2101 is substantially equal to the amount of smoke Q2 from the right smoke inlet 2102, and both are less than the amount of smoke Q4 from the rear smoke inlet 2104; that is, Q5>Q3>Q4>Q1≈Q2.

[0069] In this way, Figure 9As shown, in the initial stage of oil smoke rising, the oil smoke speed and oil smoke volume are relatively large. Although it is difficult to capture it completely at once, the range hood of the present application applies a tangential component to the rising oil smoke through the side suction inlet 220 with the maximum suction volume to change the direction of the oil smoke, forming a pulling force, which pulls the oil smoke as a whole and leans it relatively toward the side cavity 22. Based on the Coanda effect, this can greatly improve the anti-interference ability of the range hood, so that the oil smoke as a whole is relatively concentrated near the wall of the side cavity 22; at the same time, about half of the oil smoke after its trajectory is changed by the side suction inlet 220 will be captured by the side suction inlet 220, and the other oil smoke that is not captured will continue to rise.

[0070] It is worth noting that, compared to the present application, other range hoods that do not perform top-circular suction flow distribution (such as common large-opening range hoods) do not accumulate near the side cavity 22 as the amount of accumulated smoke increases during the rising process of the smoke, but gradually expand to the outer area; however, Figure 9 As shown, the range hood of the present application allocates a certain amount of air at the rear smoke inlet 2104, so that there is always a directional pulling force above the wall of the side cavity 22 to hold the oil smoke from expanding outward, and at the same time, the overall upward rising speed of the oil smoke is increased, and when the oil smoke rises to the rear smoke inlet 2104, a part of the oil smoke will be captured by the rear smoke inlet 2104; and the remaining oil smoke will slow down after hitting the top cavity 21 and diffuse to the surroundings, and the air volume allocated to the front smoke inlet 2103, the left smoke inlet 2101 and the right smoke inlet 2102 will instantly capture the diffused oil smoke to prevent the oil smoke from escaping; at the same time, the amount of smoke from the front smoke inlet 2103 is significantly higher than the amount of smoke from the left smoke inlet 2101 and the right smoke inlet 2102, which can further prevent the oil smoke from escaping from the front side.

[0071] It can be seen that the range hood of the present application distributes the air volume through the side smoke inlet 220 and the top ring smoke inlet, thereby achieving effective control of the rising path of the oil smoke, and in the multi-point smoke locking process, achieving rapid capture of the oil smoke, improving the oil smoke suction effect, and effectively preventing the oil smoke from escaping.

[0072] In addition, the smoking amount Q4 of the rear smoke inlet 2104, the smoking amount Q1 of the left smoke inlet 2101, the smoking amount Q2 of the right smoke inlet 2102 and the smoking amount Q5 of the side smoke inlet 220 can be distributed according to the set smoke inlet size.

[0073] Optionally, the flow area S5 of the side smoke inlet 220 is greater than the flow area S4 of the rear smoke inlet 2104; the flow area S1 of the left smoke inlet 2101 is basically equal to the flow area S2 of the right smoke inlet 2102, and both are smaller than the flow area S4 of the rear smoke inlet 2104, ensuring that the smoking volume Q4 of the rear smoke inlet 2104, the smoking volume Q1 of the left smoke inlet 2101, the smoking volume Q2 of the right smoke inlet 2102 and the smoking volume Q5 of the side smoke inlet 220 meet the air volume distribution requirements, thereby improving the efficiency of oil fume extraction.

[0074] Preferably, the flow area S5 of the side smoke inlet 220 is greater than the sum of the flow area S4 of the rear smoke inlet 2104, the flow area S1 of the left smoke inlet 2101 and the flow area S2 of the right smoke inlet 2102, so that the flow area S5 of the side smoke inlet 220 is much greater than the flow area S4 of the rear smoke inlet 2104, ensuring that the smoke volume Q5 of the side smoke inlet 220 remains at the maximum, so as to improve the pull-down effect of the range hood.

[0075] For example, set the total flow rate to 11.29m 3 / min, then the amount of smoke from the side smoke inlet 220 is Q5=6.4m 3 / min; the smoking volume of the front smoke inlet 2103 is Q3 = 1.83m 3 / min; the smoking volume of the rear smoke inlet 2104 is Q4=1.7m 3 / min; the smoking volume of the left smoke inlet 2101 is Q1=0.66m 3 / min; the smoking volume Q2 of the right smoke inlet 2102 is 0.7m 3 / min.

[0076] In addition, for the same smoke inlet: under the same flow rate, the smaller the flow area of ​​the smoke inlet, the greater the wind speed at the smoke inlet; therefore, the flow area S5 of the side suction smoke inlet 220 of the present application is greater than the flow area S=S1+S2+S3+S4 of the ring suction smoke inlet, that is, S5>S1+S2+S3+S4, so that the flow area S3 of the front smoke inlet 2103, the flow area S4 of the rear smoke inlet 2104, the flow area S1 of the left smoke inlet 2101 and the flow area S2 of the right smoke inlet 2102 in the ring suction smoke inlet are all smaller, thereby increasing the wind speed values ​​at various places of the ring suction smoke inlet so as to quickly capture oil smoke.

[0077] It is worth noting that the smoking amount Q2 of the rear smoke inlet 2104, the smoking amount Q3 of the left smoke inlet 2101, the smoking amount Q4 of the right smoke inlet 2102 and the smoking amount Q5 of the side smoke inlet 220 can also be distributed according to the number distribution of the guide holes 2130 for secondary flow distribution.

[0078] In addition, according to the above embodiments of the present application, Figure 4 As shown, the butterfly plate body 212 has a light-transmitting area 2121 corresponding to the mounting groove portion 2132 of the air deflector body 213 and a smoke-blocking area 2122 located around the light-transmitting area 2121 and connected to the fixing ring portion 2131 of the air deflector body 213; the top cavity 21 further includes a light panel 214 accommodated in the mounting groove portion 2132 so as to illuminate the cooking area through the light-transmitting area 2121.

[0079] Alternatively, as Figures 1 to 6 As shown, the side cavity 22 may include a longitudinal housing 221 connected to the transverse housing 211 and having a front opening 2210, and a front panel 222 disposed on the longitudinal housing 221 to partially cover the front opening 2210. The lower edge of the front panel 222 is spaced apart from the bottom wall of the longitudinal housing 221 to form a strip-shaped hole serving as the side smoke inlet 220. The side smoke inlet 220 extends from the left side wall of the longitudinal housing 221 to the right side wall of the longitudinal housing 221, thereby maximizing the flow area of ​​the side smoke inlet 220. The upper edge of the front panel 222 is spaced apart from the butterfly plate 212 to further limit the flow area of ​​the rear smoke inlet 2104, thereby increasing the wind speed at the rear smoke inlet 2104 and facilitating the rapid capture of rising oil smoke.

[0080] Preferably, if Figure 4 、 Figure 5 as well as Figure 9 As shown, the rear edge of the butterfly plate body 212 extends backward to the rear side of the front panel 222 to extend into the side cavity 22, so as to limit the flow area of ​​the rear smoke inlet 2104 through the gap formed between the front panel 222 and the butterfly plate body 212, thereby increasing the wind speed here and shielding the rear edge of the butterfly plate body 212 through the front panel 222, which is beneficial to beautifying the appearance of the product.

[0081] It is worth noting that Figure 4 、 Figure 5 as well as Figure 9As shown, in order to prevent the oil fume airflow sucked in through the side smoke inlet 220 from interfering with the oil fume airflow sucked in through the rear smoke inlet 2104, the top cavity 21 may further include a diverter plate 215, wherein the upper edge of the diverter plate 215 is fixedly connected to the guide cover 213, and the lower edge of the diverter plate 215 is close to the rear side of the front panel 222, so as to divert the oil fume airflow sucked in through the side smoke inlet 220 and the oil fume airflow sucked in through the rear smoke inlet 2104, so that the oil fume airflow sucked in through the side smoke inlet 220 flows from the rear side of the diverter plate 215 to the rear air inlet channel 112, while the oil fume airflow sucked in through the rear smoke inlet 2104 flows from the front side of the diverter plate 215 to the guide hole 2130, and then flows into the rear air inlet channel 112.

[0082] Preferably, if Figure 4 、 Figure 5 as well as Figure 9 As shown, the diverter plate 215 extends obliquely forward and downward from the rear edge of the guide cover 213 to the rear side of the front panel 222 to guide the airflow on both sides to slowly turn, which is beneficial to reducing airflow resistance.

[0083] In addition, the height of the gap formed between the front panel 222 and the butterfly plate body 212 can be less than 30 mm. Preferably, the height of the gap formed between the front panel 222 and the butterfly plate body 212 is less than or equal to 10 mm, so as to ensure that the rear smoke inlet 2104 has a sufficient amount of smoke while maximizing the wind speed at the rear smoke inlet 2104.

[0084] However, since the gap formed between the front panel 222 and the butterfly plate 212 is easily caused by a small height, a whistling sound is generated, resulting in a relatively loud noise of the range hood. Therefore, in order to solve this problem, Figure 4 、 Figure 5 as well as Figure 9 As shown, the diverter plate 215 of the present application is provided with a plurality of noise reduction holes 2150 spaced apart. Thus, when the oil smoke airflow drawn in through the side smoke inlet 220 flows upward to the diverter plate 215, most of the oil smoke airflow will be diverted backward to enter the rear air inlet channel 112, while a small portion of the oil smoke airflow will pass through the noise reduction holes 2150 and merge with the oil smoke airflow drawn in through the rear smoke inlet 2104, thereby reducing the speed of the oil smoke airflow drawn in through the rear smoke inlet 2104 to a certain extent, thereby facilitating the noise reduction function of the range hood.

[0085] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art could make numerous variations and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application.

Claims

1. A range hood, characterized in that: include: fan box; and The smoke collecting chamber includes a top cavity located below the fan box and connected to the fan box; the top cavity includes a transverse shell connected to the fan box and having a bottom opening, a butterfly plate body arranged on the transverse shell to partially cover the bottom opening, a left guide plate extending downward from the left side wall of the transverse shell, and a right guide plate extending downward from the right side wall of the transverse shell; the left and right ends of the butterfly plate body are respectively spaced apart from the left and right side walls of the transverse shell to form a left smoke inlet adjacent to the left guide plate and a right smoke inlet adjacent to the right guide plate on the left and right sides of the butterfly plate body.

2. The range hood according to claim 1, characterized in that: The width of the left smoke inlet and / or the right smoke inlet is between 5 mm and 30 mm.

3. The range hood according to claim 1 or 2, characterized in that: The smoke collecting chamber further comprises a side cavity extending downward from the rear of the top cavity; a side smoke inlet communicating with the fan box is provided at the lower portion of the side cavity.

4. The range hood according to claim 3, characterized in that: The lower edge of the left guide plate and / or the right guide plate is located between the lower surface of the butterfly plate body and the upper edge of the side smoke inlet.

5. The range hood according to claim 4, characterized in that: The longitudinal distance between the lower edge of the left guide plate and / or the right guide plate and the lower surface of the butterfly plate body is between 10 mm and 100 mm.

6. The range hood according to claim 3, characterized in that: The front end of the butterfly plate body is spaced apart from the front side wall of the transverse shell to form a front smoke inlet connected to the fan box on the front side of the butterfly plate body; the rear end of the butterfly plate body is spaced apart from the transverse shell to form a rear smoke inlet connected to the fan box on the rear side of the butterfly plate body.

7. The range hood according to claim 6, characterized in that: The top cavity further includes a flow guide cover body arranged between the transverse shell and the butterfly plate body and provided with a plurality of flow guide holes; the periphery of the flow guide cover body is fixedly connected to the transverse shell, the butterfly plate body is built into the flow guide cover body, and an annular gap connected to the flow guide holes is formed between the periphery of the butterfly plate body and the flow guide cover body to serve as a ring-shaped smoke inlet.

8. The range hood according to claim 7, characterized in that: The butterfly wing plate body extends obliquely downward from front to back; the sinking depth of the front end of the butterfly wing plate body in the deflector body is between 10mm and 100mm.

9. The range hood according to claim 7, characterized in that: The side cavity includes a longitudinal shell connected to the transverse shell and having a front opening, and a front panel arranged on the longitudinal shell to partially cover the front opening; the lower edge of the front panel is spaced apart from the bottom wall of the longitudinal shell to form a strip hole serving as the side smoke inlet; the upper edge of the front panel is spaced apart from the butterfly plate body.

10. The range hood according to claim 9, characterized in that: The top cavity further includes a diverter plate body, wherein the upper edge of the diverter plate body is fixedly connected to the guide cover body, and the lower edge of the diverter plate body is close to the rear side of the front panel; the diverter plate body extends obliquely forward and downward from the rear edge of the guide cover body to the rear side of the front panel; the diverter plate body is provided with a plurality of noise reduction holes distributed at intervals.

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