A range hood with a flow guide

Abstract

This invention relates to the field of kitchen equipment technology and discloses a range hood with a guide vane. The range hood includes a smoke collection chamber, a wind box, and a guide vane with an internal cavity. The wind box includes a wind box body located at the top of the smoke collection chamber and a fan located within the wind box body. The rear end of the fan forms a main air inlet, and the front end forms a secondary air inlet. The guide vane is located at the rear end of the main air inlet and at its outer edge. The guide vane has a guide plate facing the fan, and multiple silencer holes are spaced apart on the guide plate. By incorporating the guide vane, this invention can guide more oil fume airflow to the main air inlet using the guide plate, thereby reducing the flow of oil fume airflow to the secondary air inlet, reducing vortex airflow, improving air intake efficiency, and also reducing noise using the cavity and multiple silencer holes of the guide vane, resulting in a better user experience.

Description

Technical Field

[0001] This invention relates to the field of kitchen equipment technology, and in particular to a range hood with a deflector. Background Technology

[0002] Range hoods can quickly remove harmful fumes from stoves and cooking processes, expelling them outdoors and purifying the kitchen environment. They have been widely used.

[0003] Currently, due to the limitations of its own structural dimensions, the main air inlet of the range hood is relatively narrow, resulting in poor uniformity of airflow. High-velocity fumes tend to flow towards the top of the fan housing and then enter the fan through the secondary air inlet. They then swirl between the main air inlet and the rear end of the fan housing, creating a vortex airflow that causes airflow blockage. This results in poor air intake performance and significant noise from the fan. Summary of the Invention

[0004] The technical problem solved by this invention is to provide a range hood with a guide element, which effectively solves the problems of uneven air intake, poor air intake effect, and excessive noise caused by the formation of vortex airflow between the main air inlet of the fan and the rear end of the air box.

[0005] The above-mentioned technical problems are solved by the following technical solutions:

[0006] A range hood with a flow guide includes a smoke collection chamber, a wind box, and a flow guide with an internal cavity. The wind box includes a wind box body located at the top of the smoke collection chamber and a fan located inside the wind box body. The rear end of the fan forms a main air inlet, and the front end of the fan forms a secondary air inlet. The flow guide is located at the rear end of the main air inlet and is located on the outer edge of the main air inlet. The flow guide has a guide plate facing the fan, and the guide plate has a plurality of silencer holes spaced apart.

[0007] Compared with the prior art, the range hood described in this invention has the following advantages: the guide component is located at the rear end of the main air inlet and has a guide plate facing the fan. After the range hood is working, when the rising oil fume airflow flows towards the top of the air box, more airflow is blocked by the guide plate of the guide component and flows towards the main air inlet, thereby reducing the flow of oil fume airflow from the top of the air box to the secondary air inlet. This disrupts the formation of vortex airflow at the rear end of the main air inlet, reduces the impact of vortex airflow on the intake airflow, improves the smoothness of the intake airflow, and thus improves the intake effect and efficiency. In addition, it can also reduce the noise generated by vortex airflow. Moreover, the guide component has a cavity inside, and multiple silencer holes are spaced apart on the guide plate. Noise is absorbed and attenuated when passing through the silencer holes. After entering the cavity, the noise disturbs the air inside the cavity, thereby reducing the intensity of the noise wave and reducing noise, resulting in a better user experience. The air guide plate is located on the outer edge of the main air inlet, which can also avoid the main air inlet and prevent the air guide plate from affecting the air intake of the main air inlet.

[0008] In one embodiment, the air guide plate is a flat plate or an arc-shaped plate recessed into the cavity of the air guide.

[0009] In one embodiment, the aperture φ of the silencing hole ranges from 1 mm to 5 mm;

[0010] And / or, the perforation rate of the air guide plate ranges from 6% to 24%.

[0011] In one embodiment, a sound-absorbing layer is attached to the inner side of the air guide plate, and the sound-absorbing layer covers a plurality of the sound-absorbing holes.

[0012] In one embodiment, the air guide is in the form of a triangular prism and further includes a first panel and a second panel that are connected at an angle to the upper and lower ends of the air guide plate, respectively, and a pair of side panels disposed on the left and right sides of the first panel, the second panel and the air guide plate. The first panel is also connected to the second panel and forms the cavity with the air guide plate and the pair of side panels. The pair of side panels are connected to the opposite sides of the air box body. The first panel faces the top plate of the air box body and the second panel faces the back plate of the air box body.

[0013] In one embodiment, the surfaces of the first panel and / or the second panel are uneven.

[0014] In one embodiment, the first panel and / or the second panel are provided with a plurality of pressed structures, and the plurality of silencing holes form a plurality of spaced groups of silencing holes on the air guide plate. The projection of the area of ​​each group of silencing holes on the air guide plate onto the first panel and / or the second panel is located between two adjacent pressed structures.

[0015] In one embodiment, the projected width of the area of ​​each group of silencing holes on the air guide plate on the first panel and / or the second panel is less than or equal to half of the farthest distance L between two adjacent forming structures;

[0016] And / or, the distance between the top or bottom of the molding structure and the surface of the first or second panel is greater than 8 mm.

[0017] In one embodiment, the thickness of the first panel, the second panel, and the air guide plate ranges from 0.4 mm to 1 mm;

[0018] And / or, the angle θ between the first panel and the air guide plate is in the range of 30 degrees to 60 degrees.

[0019] In one embodiment, the first panel is located on one side inside the bellows housing and tilted toward the fan;

[0020] Alternatively, the first panel may be a convex arc-shaped plate. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a partial structural diagram of a range hood with a flow guide component according to an embodiment of the present invention;

[0023] Figure 2 This is a partial structural diagram of a range hood with a flow guide component from another angle, according to an embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the flow guide component according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the flow guide component from another angle according to an embodiment of the present invention;

[0026] Figure 5 for Figure 4 A side view from a certain angle;

[0027] Figure 6 for Figure 5 The projection diagram along the AA direction;

[0028] Figure 7 for Figure 6Enlarged view of point B in the image;

[0029] Figure 8 This is a schematic diagram of the first panel of the flow guide component according to an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the second panel of the flow guide component according to an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the air guide plate of the air guide component according to an embodiment of the present invention;

[0032] Figure 11 This is a schematic diagram of the flow guide component according to another embodiment of the present invention;

[0033] Figure 12 for Figure 11 A side view from a certain angle;

[0034] Figure 13 This is a side view of a guide member from a certain angle according to another embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Smoke collection chamber; 2. Air box; 201. Air box body; 202. Fan; 2021. Main air inlet; 2022. Secondary air inlet; 3. Guide component; 301. Air guide plate; 302. First panel; 303. Second panel; 304. Side plate; 305. Silencing hole; 306. Molded structure. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] In existing range hoods, the main airflow of cooking fumes enters from the bottom inlet of the smoke collection chamber, with most of the fumes flowing into the main air inlet of the fan. A small portion of the fumes flows towards the secondary air inlets at the bottom and top of the fan housing. Due to the size and structure of the fan, the distance between the main air inlet and the rear end of the fan housing is relatively narrow, effectively creating the rear end of the main air inlet. This abrupt narrowing of the fumes' entry cross-section at the rear end of the main air inlet easily leads to uneven airflow, causing the higher-velocity fumes to flow towards the top of the fan housing. Because there is a gap between the top of the fan housing and the fan, this gap forms a channel connecting the main and secondary air inlets. Some of the fumes pass through this channel and enter the fan from the secondary air inlet, easily creating a vortex airflow at the rear end of the main air inlet. This vortex airflow affects the fan's airflow efficiency, resulting in lower airflow efficiency and generating noise from the vortex airflow.

[0042] The following is combined with Figures 1 to 13 The following describes embodiments of the present invention.

[0043] According to embodiments of the present invention, such as Figure 1 As shown, a range hood with a flow guide is provided, which mainly includes a smoke collection chamber 1, a wind box 2, and a flow guide 3 with an internal cavity.

[0044] Furthermore, the air box 2 includes an air box body 201 located at the top of the smoke collection chamber 1 and a fan 202 located inside the air box body 201. The fan 202 is used to generate negative pressure and suck up the oil fumes. The air box body 201 is used to support and install the fan 202 and form a flow space for airflow.

[0045] like Figure 1As shown, the rear end of the fan 202 forms the main air inlet 2021, and the front end forms the secondary air inlet 2022. The guide vane 3 is located at the rear end of the main air inlet 2021 and is positioned on its outer edge. The guide vane 3 has a guide plate 301 facing the fan 202. The guide plate 301 guides more airflow into the main air inlet 2021 and blocks some airflow from entering the secondary air inlet 2022, thereby reducing vortex airflow. The guide plate 301 is positioned on the outer edge of the main air inlet 2021 to avoid obstructing the main air inlet 2021. Multiple silencing holes 305 are spaced apart on the guide plate 301, forming a perforated silencing and noise reduction system that absorbs noise within the entire fan housing 201, achieving a good noise reduction effect.

[0046] Therefore, in the range hood provided in this embodiment, the guide vane 3 is located at the rear end of the main air inlet 2021 and has a guide plate 301 facing the fan 202. After the range hood is working, when the rising oil fume airflow flows towards the top of the air box 2, more airflow is blocked by the guide plate 301 of the guide vane 3 and flows towards the main air inlet 2021. This reduces the flow of oil fume airflow from the top of the air box 201 to the secondary air inlet 2022, thereby disrupting the formation of vortex airflow at the rear end of the main air inlet 2021, reducing the impact of vortex airflow on the intake airflow, improving the smoothness of the intake airflow, and thus improving the intake effect and efficiency. In addition, it can also reduce the noise generated by the vortex airflow.

[0047] Furthermore, the guide vane 3 has a closed cavity inside, and the guide vane 301 is provided with multiple silencers 305 spaced apart. When noise passes through the silencers 305, it is absorbed and attenuated by the silencers 305. After the noise enters the cavity, it disturbs the air in the closed cavity, thereby reducing the intensity of the noise wave and reducing noise, resulting in a better user experience. The guide vane 301 is located on the outer edge of the main air inlet 2021, which also avoids the main air inlet 2021 and prevents the guide vane 301 from affecting the air intake of the main air inlet 2021.

[0048] Compared to traditional range hoods, the embodiments of this application can allow more oily fumes to flow into the fan 202 through the main air inlet 2021 and then be discharged. This can significantly reduce vortex airflow, improve airflow smoothness, and reduce the airflow velocity at the fan 202 outlet, thus mitigating airflow impact, improving outlet blockage, and increasing the air volume and efficiency of the fan 202.

[0049] Specifically, the guide component 3 is disposed inside the air box body 201, and its opposite ends are connected to the left and right sides of the air box body 201 respectively, and are located above the main air inlet 2021. The front end of the range hood refers to the side closer to the user, and the rear end refers to the side farther from the user, with the rear end generally positioned against a wall. The main air inlet 2021 of the fan 202 is generally located at the rear end of the range hood, and the secondary air inlet 2022 is generally located at the front end. The guide component 3 is located above the side of the air box body 201 closest to the main air inlet 2021, that is, above the rear end of the air box body 201. The front, back, left, right, up, and down directions of this embodiment are as follows: Figure 1 As shown by the arrow in the image.

[0050] In one embodiment, such as Figures 3 to 5 As shown, the air guide plate 301 is a flat plate with a simple structure, easy installation, and low operating cost.

[0051] In some other embodiments, such as Figure 11 As shown, the air guide plate 301 is an arc-shaped plate with a concave cavity in the air guide component 3. Setting the air guide plate 301 as an arc-shaped plate with a concave cavity can better guide the flow direction of the oil fume airflow and improve the smoke intake effect of the main air inlet 2021.

[0052] Since the airflow at the main air inlet 2021 is relatively rapid and mainly consists of mid-to-high frequency noise, the smaller the aperture and the higher the perforation rate of the silencing hole 305, the better the sound absorption effect for mid-to-high frequency noise. Furthermore, in one embodiment, the aperture φ of the silencing hole 305 ranges from 1mm to 5mm, and the perforation rate of the air guide plate 301 ranges from 6% to 24%. For example, the aperture of the silencing hole 305 is 1mm, and the perforation rate of the air guide plate 301 is 20%.

[0053] In one embodiment, a sound-absorbing layer (not shown in the figure) is attached to the inner side of the air guide plate 301, and the sound-absorbing layer covers multiple sound-absorbing holes 305. By covering multiple sound-absorbing holes 305 with the sound-absorbing layer, noise can be absorbed and attenuated, further improving the noise reduction effect and providing a better user experience.

[0054] Specifically, the sound-absorbing layer can be pre-attached to the inside of the air guide plate 301 with adhesive, and then the first panel 302, the second panel 303, the air guide plate 301 and a pair of side panels 304 are spliced ​​and installed as a whole.

[0055] It should be noted that the embodiments of this application do not limit the material of the sound-absorbing layer. Any existing sound-absorbing material can be selected as needed, such as sound-absorbing cotton, glass fiber sound-absorbing board, polyurethane foam board, etc., which have good moisture-proof and corrosion-resistant properties and are suitable for use in kitchen environments.

[0056] In one embodiment, such as Figure 3 and Figure 4As shown, the air guide 3 is shaped like a triangular prism. The air guide 3 also includes a first panel 302 and a second panel 303 connected at included angles to the upper and lower ends of the air guide plate 301, and a pair of side panels 304 disposed on the left and right sides of the first panel 302, the second panel 303, and the air guide plate 301. The first panel 302 is also connected to the second panel 303, and together with the air guide plate 301 and the pair of side panels 304, forms a cavity. The pair of side panels 304 are connected to the opposite sides of the air box body 201.

[0057] Specifically, the first panel 302, the second panel 303, the air guide plate 301, and a pair of side panels 304 are assembled together to form a closed cavity in the shape of a triangular prism. The assembly can be done using conventional methods such as welding or snap-fit ​​connections. Since the bellows box 201 is generally a rectangular cavity, the air guide 3, being a triangular prism, can adapt to the structure of the bellows box 201. The first panel 302 serves as a horizontal plane, the second panel 303 as a vertical plane, and the air guide plate 301 as an inclined plane, positioned at the outer edge of the main air inlet 2021 to prevent it from obstructing the main air inlet 2021. The bellows box 201 has a top plate at the top and a back plate at the rear. The first panel 302 faces the top plate of the bellows box 201, and the second panel 303 faces the back plate. The intersection of the air guide plate 301 and the second panel 303 can rest against the back plate or have a gap between them.

[0058] When noise reaches the guide vane 3, it is absorbed and attenuated, and the noise will not leak from the enclosed cavity, thus achieving a noise reduction effect and improving the user experience. The oil fume airflow is blown to the guide vane 301, and after being blocked by the guide vane 301, it flows to the main air inlet 2021, reducing the flow of oil fume airflow from the top to the secondary air inlet 2022, thereby reducing the vortex airflow.

[0059] It should be noted that the embodiments of this application do not restrict the connection method between the side plate 304 and the air box body 201. A fastener connection method or a snap-fit ​​connection method can be used.

[0060] In one embodiment, such as Figure 2 As shown, mounting holes are provided on the left and right sides of the bellows housing 201, and mounting holes are also provided on the side plates 304. Fasteners are used to pass through the mounting holes on the side plates 304 and the bellows housing 201, respectively, to fix the side plates 304 to the opposite sides of the bellows housing 201. Sealing gaskets are provided at the fasteners and mounting holes to prevent noise leakage. Conventional fasteners such as screws and bolts can be used, and the mounting holes are either threaded holes or round holes for easy disassembly and maintenance. In addition, to facilitate the installation of the air guide 3, the opposite side edges of the bellows housing 201 extend inward to form flanges, which are used to further fix and restrict the air guide 3.

[0061] In some other embodiments, the side panels 304 can also be glued to the opposite sides of the bellows box body 201 with adhesive, which provides a firm connection and facilitates installation.

[0062] In one embodiment, the surfaces of the first panel 302 and / or the second panel 303 are uneven to form a sound wave reflecting surface, extend the sound wave attenuation path, and further reduce noise.

[0063] It should be noted that the uneven surface can be formed using any existing structure, such as providing multiple grooves, protrusions or prism structures on the surface of the first panel 302 and / or the second panel 303.

[0064] In one embodiment, such as Figure 1 , Figure 3 and Figure 8 As shown, a gap is left between the top surface of the first panel 302 and the top plate of the bellows housing 201. Multiple pressed structures 306 are provided on the top surface of the first panel 302. The pressed structures 306 on the first panel 302 create an uneven surface, reflecting noise from outside the enclosed cavity, extending the noise propagation path, and improving the noise reduction effect. The multiple pressed structures 306 on the first panel 302 can be concave towards the inside of the cavity or convex towards the outside of the cavity.

[0065] Furthermore, such as Figure 3 and Figure 9 As shown, the second panel 303 may also have multiple molded structures 306. That is, the surfaces of the first panel 302 and / or the second panel 303 are formed with a specific shape or a specific surface texture. After noise propagates to the molded structure 306, it is reflected by the molded structure 306, which prolongs the propagation path of the noise, further improves the noise reduction effect, and provides a better user experience.

[0066] In addition, multiple pressed structures 306 are provided on the first panel 302 and / or the second panel 303 respectively, which can form a closed cavity with uneven thickness to absorb noise over a wider range of frequencies and improve the sound absorption effect of the closed cavity. Compared with the traditional method of increasing the thickness of the sound-absorbing layer to improve the sound absorption effect, the embodiment of this application has a lower cost and is easier to promote.

[0067] Since the rear end of the bellows box 201 is closed by the back panel, and the second panel 303 faces the back panel of the bellows box 201, in order to avoid the molding structure 306 on the second panel 303 from interfering with the back panel of the bellows box 201, the multiple molding structures 306 on the second panel 303 are recessed into the cavity.

[0068] It should be noted that the embodiments of this application do not limit the specific structure of the molding structure 306, and the molding structure 306 can be selected from any existing structure as needed. In order to improve the noise reflection effect of the molding structure 306, in one embodiment, the molding structure 306 is a triangular molding structure, that is, a groove with a triangular cross-section. Multiple triangular molding structures are spaced apart on the first panel 302 and the second panel 303.

[0069] In one embodiment, such as Figures 5 to 7 As shown, multiple silencing holes 305 form multiple sets of silencing hole groups spaced apart on the air guide plate 301. The projection of the area of ​​each silencing hole group on the air guide plate 301 on the first panel 302 and / or the second panel 303 is located between two adjacent pressed structures 306.

[0070] like Figure 7 As shown, the pressed structure 306 needs to be used in conjunction with the silencing hole 305. The projection of the area of ​​each group of silencing holes on the air guide plate 301 on the first panel 302 and / or the second panel 303 is located between two adjacent pressed structures 306. Therefore, after the noise passes through the silencing hole 305, it is directly transmitted to the inclined surface of the pressed structure 306 and further reflected and dissipated, thereby further improving the noise reduction effect.

[0071] Furthermore, in one embodiment, such as Figure 7 As shown, the projection width of each group of noise reduction holes on the air guide plate 301 on the first panel 302 and / or the second panel 303 is less than or equal to half of the farthest distance L between two adjacent pressed structures 306, resulting in significant noise reduction and a better user experience.

[0072] Furthermore, in one embodiment, the distance between the top or bottom of the molding structure 306 and the surface of the first panel 302 or the second panel 303 is greater than 8 mm. Taking an example where the molding structure 306 of both the first panel 302 and the second panel 303 is concave, as... Figure 7 As shown, the distance H between the bottom of the molding structure 306 on the first panel 302 and the surface of the first panel 302 is greater than 8mm, and the distance between the bottom of the molding structure 306 on the second panel 303 and the surface of the second panel 303 is greater than 8mm. This means the molding structure 306 has a groove depth greater than 8mm, resulting in a larger noise reflection area on the first panel 302 and / or the second panel 303. The noise is reflected and attenuated by this noise reflection area formed by the molding structure 306. If the groove depth of the molding structure 306 is less than 8mm, the noise reflection area is smaller, the probability of noise being reflected by the molding structure 306 decreases, and the noise reduction effect is poor.

[0073] In one embodiment, the thickness of the first panel 302, the second panel 303, and the air guide plate 301 ranges from 0.4 mm to 1 mm. The acoustic impedance and acoustic impedance decrease as the thickness of the air guide plate 301 decreases; a smaller thickness of the air guide plate 301 results in better sound absorption for mid-to-high frequencies. Therefore, while ensuring the structural strength of the air guide plate 301, its thickness should be relatively small. For example, the thickness of the air guide plate 301 can be 0.4 mm.

[0074] In one embodiment, such as Figure 3 As shown, the angle θ between the first panel 302 and the air guide plate 301 ranges from 30 degrees to 60 degrees. Within this range, the larger the angle θ between the first panel 302 and the air guide plate 301, the better the air guide plate 301 guides the airflow into the main air inlet 2021, and the better the noise reduction effect is achieved by changing the direction of sound radiation.

[0075] In one embodiment, such as Figure 12 As shown, the first panel 302 is located inside the air box 201 and is tilted towards the fan 202. That is, the angle between the first panel 302 and the second panel 303 is acute, and the front end of the first panel 302 tilts downwards. When the range hood is working, as the rising oil fume flows towards the top of the air box 2, more of the oil fume is blocked by the guide plate 301 of the guide component 3 and flows towards the main air inlet 2021. This reduces the flow of oil fume from the top of the air box 201 to the secondary air inlet 2022. Some oil fume will pass over the top of the air box 201 and then over the first panel 302. Because the front end of the first panel 302 tilts downwards, the oil stains formed by the oil fume can flow downwards using the slope. Furthermore, by extending the width of the second panel 303 and adjusting the downward tilt of the front end of the first panel 302, the width of the enclosed cavity can be increased, which helps improve the noise reduction effect.

[0076] In one embodiment, such as Figure 13 As shown, the first panel 302 is a convex arc-shaped plate. Setting the first panel 302 as a convex arc-shaped plate can also guide the oil stains to flow downwards using the arc surface, and it also helps to increase the width of the enclosed cavity and improve the noise reduction effect.

[0077] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0078] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A range hood with a flow guide, characterized in that: The device includes a smoke collection chamber (1), a wind box (2), and a guide member (3) with an internal cavity. The wind box (2) includes a wind box body (201) located at the top of the smoke collection chamber (1) and a fan (202) located inside the wind box body (201). The rear end of the fan (202) forms a main air inlet (2021), and the front end of the fan (202) forms a secondary air inlet (2022). The guide member (3) is located at the rear end of the main air inlet (2021) and is located at the upper outer edge of the main air inlet (2021). The guide member (3) is provided with a guide plate (301) facing the fan (202), and a plurality of silencer holes (305) are spaced apart on the guide plate (301). The flow guide (3) is in the shape of a triangular prism and also includes a first panel (302) and a second panel (303) that are connected at an angle to the upper and lower ends of the air guide plate (301), and a pair of side plates (304) disposed on the left and right sides of the first panel (302), the second panel (303) and the air guide plate (301). The first panel (302) is also connected to the second panel (303) and forms the cavity with the air guide plate (301) and the pair of side plates (304). The pair of side plates (304) are connected to the opposite sides of the air box body (201). The first panel (302) faces the top plate of the air box body (201), and the second panel (303) faces the back plate of the air box body (201). The surfaces of the first panel (302) and / or the second panel (303) are uneven; The first panel (302) and / or the second panel (303) are provided with a plurality of pressed structures (306), and the plurality of silencer holes (305) form a plurality of sets of silencer holes spaced apart on the air guide plate (301). The projection of the area of ​​each set of silencer holes on the air guide plate (301) onto the first panel (302) and / or the second panel (303) is located between two adjacent pressed structures (306).

2. The range hood with a flow guide as described in claim 1, characterized in that: The air guide plate (301) is a flat plate or an arc-shaped plate that is recessed into the cavity of the air guide (3).

3. A range hood with a flow guide as described in claim 1, characterized in that: The aperture φ of the silencing hole (305) ranges from 1 mm to 5 mm; And / or, the perforation rate of the air guide plate (301) ranges from 6% to 24%.

4. A range hood with a flow guide as described in claim 1, characterized in that: The inner side of the air guide plate (301) is covered with a sound-absorbing layer, which covers a plurality of the sound-absorbing holes (305).

5. A range hood with a flow guide as described in claim 1, characterized in that: The projected width of the area of ​​each group of silencer holes on the air guide plate (301) on the first panel (302) and / or the second panel (303) is less than or equal to half of the farthest distance L between two adjacent pressed structures (306); And / or, the distance between the top or bottom of the molding structure (306) and the surface of the first panel (302) or the second panel (303) is greater than 8 mm.

6. A range hood with a flow guide as described in claim 1, characterized in that: The thickness of the first panel (302), the second panel (303), and the air guide plate (301) ranges from 0.4 mm to 1 mm; And / or, the angle θ between the first panel (302) and the air guide plate (301) ranges from 30 degrees to 60 degrees.

7. A range hood with a flow guide as described in claim 1, characterized in that: The angle between the first panel (302) and the second panel (303) is acute, and the front end of the first panel (302) is tilted downward; Alternatively, the first panel (302) may be a convex arc-shaped plate.

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