Fume hood and range hood having the same

Abstract

The utility model provides a kind of smoke hood and have its range hood, belong to kitchen appliance technical field, the smoke hood is connected in the front opening of smoke machine shell, it includes two guide grooves and two air inlets, the cavity of the smoke cavity is recessed to the inside of smoke machine shell, the longitudinal section of the smoke cavity is triangle, and the smoke cavity includes rear side wall;Two guide grooves are formed by the recess of rear side wall to the inside of smoke machine shell respectively, the slot bottom of each guide groove is equipped with air inlet, wherein, the flow area of guide groove is continuously tapered structure along the smoke flow direction, and at least one slot wall of guide groove forms inclined flow guide surface, to guide flow to air inlet with smoke.The utility model can produce downward pressure in the upper portion of air inlet, when oil fume produces rising, can lock more oil fume, reduce the escape of oil fume;Enhance the flow guide to smoke, improve the effect of smoking, reach the purpose of quickly sucking away oil fume and reducing noise.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a smoke collection hood and a range hood having the same. Background Technology

[0002] In modern homes, range hoods have become an indispensable kitchen appliance. To integrate range hoods with kitchen cabinets and save space, they are typically embedded in the cabinets, resulting in a cleaner and more aesthetically pleasing kitchen design. However, this design and installation of the fume hood places specific demands on the effectiveness, safety, and aesthetics of smoke extraction. Unfortunately, existing fume hoods often have relatively small and poorly designed smoke inlets, leading to poor smoke collection and slow smoke extraction. Utility Model Content

[0003] The first technical problem this invention aims to solve is to address the issues of existing technologies by providing a smoke collection hood that, through the smoke collection chamber and the two guide grooves, creates downward pressure at the upper part of the air inlet. When oil fumes rise, this hood can trap more oil fumes, reducing their escape; it also enhances the flow of smoke, improves the smoke extraction effect, reduces motor speed and power, and achieves the effect of quickly removing oil fumes and reducing noise.

[0004] The second technical problem to be solved by this utility model is to provide a range hood for use with the smoke collection hood.

[0005] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a smoke collection hood, wherein the smoke collection hood is connected to the front opening of the smoke machine housing, and the smoke collection hood includes:

[0006] The smoke collection chamber is recessed into the interior of the smoke machine housing. The longitudinal cross-section of the smoke collection chamber is triangular, and the smoke collection chamber includes a rear sidewall.

[0007] Two guide grooves are formed by recesses inward from the rear sidewall into the casing of the range hood; each guide groove has an air inlet at its bottom.

[0008] The guide groove has a continuously tapering flow area along the flue gas flow direction, and at least one groove wall of the guide groove forms an inclined guide surface to guide the flue gas to the air inlet.

[0009] According to one embodiment of the present invention, the two guide grooves are symmetrical about left and right, and each guide groove includes:

[0010] The upper groove wall, located at the upper part of the smoke collection chamber, includes two oppositely arranged first ends and second ends. The second end is located in the middle of the smoke collection chamber, and the first end extends downward at an angle away from the middle of the smoke collection chamber.

[0011] The lower slot wall, located below the upper slot wall;

[0012] The first slot wall, with its top connected to the first end and its bottom connected to the lower slot wall;

[0013] The second slot wall, with its top connected to the second end and its bottom connected to the lower slot wall;

[0014] Wherein, the upper slot wall, the first slot wall, the lower slot wall and the second slot wall all extend obliquely from the slot opening of the guiding slot towards the middle of the slot bottom, making the flow-through cross-section of the guiding slot continuously tapered.

[0015] According to an embodiment of the present invention, wherein the included angle between the first slot wall and the rear side wall is a, the included angle between the upper slot wall and the rear side wall is b, the included angle between the second slot wall and the rear side wall is c, and the included angle between the lower slot wall and the rear side wall is d, wherein, a < b, b < c and b < d.

[0016] According to an embodiment of the present invention, wherein arc-shaped transition sections are provided between the upper slot wall and the first slot wall, between the first slot wall and the lower slot wall, between the lower slot wall and the second slot wall, and between the second slot wall and the upper slot wall.

[0017] According to an embodiment of the present invention, wherein a circular ring edge surrounding the air inlet is provided on one side of the slot bottom of the guiding slot close to the inside of the range hood housing, and a bending portion that turns over towards its outer peripheral surface is provided at the free end of the circular ring edge.

[0018] According to an embodiment of the present invention, wherein the circular ring edge includes a top ring edge located at the top of the air inlet, the top ring edge extends obliquely upward from the first slot wall towards the second slot wall, and the inclination angle of the top ring edge is α, wherein, 6° < α < 15°.

[0019] According to an embodiment of the present invention, wherein the sum of the areas of the slot openings of the two guiding slots is S1, and the area of the cavity opening of the smoke collecting cavity is S2, wherein, 0.55 ≤ S1 / S2 ≤ 0.8.

[0020] According to an embodiment of the present invention, wherein the smoke collecting cavity includes:

[0021] A bottom wall, which is gradually inclined upward from outside to inside;

[0022] A left side wall, extending inward from the left side of the front opening of the range hood housing and extending towards the middle of the smoke collecting cavity;

[0023] A right side wall, extending inward from the right side of the front opening of the range hood housing and extending towards the middle of the smoke collecting cavity;

[0024] The rear sidewall is connected to the rear end of the bottom wall, the left side wall and the right side wall. The rear sidewall is inclined from top to bottom and rearward. The plane of the rear sidewall and the opening plane of the smoke collection chamber form an angle β, where 5°≤β≤10°.

[0025] According to one embodiment of the present invention, the lower edge of the bottom wall is provided with a first flange for connecting with the range hood housing, and the side of the first flange near the range hood housing is provided with a plurality of oil leakage holes, and each oil leakage hole is provided with a second flange extending into the range hood housing.

[0026] The technical solution adopted by this utility model to solve the second technical problem mentioned above is: a range hood, the range hood including the smoke collection hood as described in any of the above claims.

[0027] Compared with the prior art, the present invention has the following advantages or beneficial effects:

[0028] This invention utilizes the triangular shape of the smoke-collecting chamber to create downward pressure at the upper part of the air inlet. As the fumes rise, this design traps more smoke, reducing its escape. The two guide grooves and two air inlets guide the flow of smoke, improving airflow and smoke extraction efficiency, while reducing motor speed and power consumption. This achieves the goal of quickly removing fumes and reducing noise. Attached Figure Description

[0029] The above and other features and advantages of this invention will become more apparent from a detailed description of exemplary embodiments with reference to the accompanying drawings.

[0030] Figure 1 This is a schematic diagram of a smoke hood according to an exemplary embodiment.

[0031] Figure 2 This is a front view of a smoke hood shown according to an exemplary embodiment.

[0032] Figure 3 yes Figure 2 Sectional view along the AA direction.

[0033] Figure 4 yes Figure 2 Sectional view in the BB direction.

[0034] Figure 5 yes Figure 4 Enlarged diagram of point A in the middle.

[0035] Figure 6 This is a schematic diagram of a range hood according to an exemplary embodiment.

[0036] Figure 7 This is a cross-sectional view showing the connection between the smoke hood and the housing according to an exemplary embodiment.

[0037] Figure 8 This is a schematic diagram illustrating the connection between the smoke hood and the oil cup according to an exemplary embodiment. Attached image description:

[0039] 1. Smoke collection chamber; 11. Rear side wall; 111. Through hole; 112. Step hole; 113. Limiting plate; 1131. Reinforcing rib; 12. Bottom wall; 121. First flange; 122. Oil leakage hole; 123. Second flange; 13. Left side wall; 14. Right side wall;

[0040] 2. Guide groove; 20. Air inlet; 21. Upper groove wall; 22. Lower groove wall; 23. First groove wall; 24. Second groove wall; 25. Arc-shaped transition section; 26. Annular edging; 261. Bending section; 262. Top edging;

[0041] 100. Range hood housing; 200. Lamp cover; 300. Oil cup. Detailed Implementation

[0042] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0043] The terms “a,” “one,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “include” and “have” are used to indicate an open-ended meaning of inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.

[0044] This embodiment of the utility model provides a smoke collection hood, which is connected to the front opening of the range hood housing 100, such as... Figure 1-5 As shown, the smoke collection hood includes a smoke collection chamber 1 and two guide grooves 2. The smoke collection chamber 1 is recessed into the smoke machine housing 100, and its longitudinal cross-section is triangular. The smoke collection chamber 1 includes a rear sidewall 11, and the two guide grooves 2 are formed by the recesses of the rear sidewall 11 into the smoke machine housing 100. Each guide groove 2 has an air inlet 20 at its bottom. The flow area of ​​the guide groove 2 has a continuously tapering structure along the direction of smoke flow, and at least one groove wall of the guide groove 2 forms an inclined guiding surface to guide the smoke to the air inlet 20. Figure 1-2The longitudinal section of the smoke collecting cavity 1 shown is triangular, which will cause a downward pressure on the upper part of the air inlet 20. When the oil fume rises, more oil fume can be locked, reducing the escape of oil fume. The guiding groove 2 can guide the flue gas, improve the air inlet effect, enhance the smoking ability, reduce the motor speed and power, and achieve the purpose of quickly sucking away the oil fume and reducing the noise. The double air inlet structure optimizes the air inlet path, avoids the escape of oil fume on both sides of the smoke collecting hood, improves the air inlet effect, and achieves the effect of quickly sucking away the oil fume.

[0045] In a preferred embodiment of the present invention, as Figure 1-5 shown, the two guiding grooves 2 are symmetric about the left and right. Each guiding groove 2 includes an upper groove wall 21, a lower groove wall 22, a first groove wall 23 and a second groove wall 24. The upper groove wall 21 is located at the upper part of the smoke collecting cavity 1, including two relatively arranged first ends and second ends. The second end is located in the middle of the smoke collecting cavity 1, and the first end extends obliquely downward along the direction away from the middle of the smoke collecting cavity 1; the lower groove wall 22 is located below the upper groove wall 21; the top of the first groove wall 23 is connected to the first end, and the bottom is connected to the lower groove wall 22; the top of the second groove wall 24 is connected to the second end, and the bottom is connected to the lower groove wall 22; wherein, the upper groove wall 21, the first groove wall 23, the lower groove wall 22 and the second groove wall 24 all extend obliquely from the notch of the guiding groove 2 to the middle of the groove bottom, so that the flow cross-section of the guiding groove 2 is continuously tapered. Among them, the upper groove wall 21, the lower groove wall 22, the first groove wall 23 and the second groove wall 24 all extend towards the middle of the guiding groove 2. The inner sides of the upper groove wall 21, the lower groove wall 22, the first groove wall 23 and the second groove wall 24 can all be used as a guiding surface, which can guide the flue gas, improve the air inlet effect, enhance the smoking ability, reduce the motor speed and power, achieve the effect of quickly sucking away the oil fume and reducing the noise, improve the air suction efficiency, enhance the smoking ability, and achieve the effect of quickly sucking away the oil fume.

[0046] In a preferred embodiment of the present invention, as Figure 1-5 shown, the included angle between the first groove wall 23 and the rear side wall 11 is a, the included angle between the upper groove wall 21 and the rear side wall 11 is b, the included angle between the second groove wall 24 and the rear side wall 11 is c, and the included angle between the lower groove wall 22 and the rear side wall 11 is d. Among them, a < b, b < c and b < d, so that the height of the first groove wall 23 is greater than that of the upper groove wall 21, and the upper groove wall 21 is simultaneously greater than those of the lower groove wall 22 and the second groove wall 24. From Figure 1-2It is easy to see that the shapes and inclination angles of the upper groove wall 21, lower groove wall 22, first groove wall 23, and second groove wall 24 in this application are all different. Among them, the angle α between the first groove wall 23 and the rear side wall 11 is the smallest, generally ranging from 5° to 15°, making the height of the first groove wall 23 the largest, increasing the negative pressure suction, and preventing the oil fumes at both ends of the smoke collection chamber 1 from escaping due to weak suction. The angle b between the upper groove wall 21 and the rear side wall 11 is greater than the angle α, generally ranging from 20° to 30°. Since the upper groove wall 21 is relatively long, in order to ensure the air guiding function, the height of the upper groove wall 21 should be minimized, that is, the value of b should be increased, to avoid the problem of oil accumulation and dripping on the upper groove wall 21. In addition, the angle between the lower groove wall 22 and the second groove wall 24 and the rear side wall 11 can be increased to 45°, so that the height of the air guiding surface of the lower groove wall 22 and the second groove wall 24 will be reduced, which increases the air inlet area, increases the air volume, and reduces noise while ensuring the air guiding function. It should be noted that the height in this embodiment is the distance between the upper edge and the lower edge of the corresponding groove wall.

[0047] In a preferred embodiment of this utility model, such as Figure 1-5 Arc-shaped transition sections 25 are provided between the upper groove wall 21 and the first groove wall 23, between the first groove wall 23 and the lower groove wall 22, between the lower groove wall 22 and the second groove wall 24, and between the second groove wall 24 and the upper groove wall 21. These can reduce internal stress concentration during molding and prevent cracking. At the same time, they can prevent the first groove wall 23 and the top edge 262 from being too long, which would lead to the risk of oil droplets accumulating and dripping when passing the inclined edge.

[0048] In a preferred embodiment of this utility model, such as Figure 2-5 The guide groove 2 shown has an annular rim 26 surrounding the air inlet 20 on the side of its bottom closest to the interior of the range hood housing 100. The free end of the annular rim 26 has a bent portion 261 that folds outwards, preventing the risk of sharp edges from scratching the hand. Furthermore, since high-speed airflow passing over sharp edges or burrs can cause noise during smoking, the bending design of this application strengthens the air inlet 20, making its shape stable and less prone to deformation.

[0049] In a preferred embodiment of this utility model, such as Figure 2-5 The annular rim 26 shown includes a top rim 262 located at the top of the air inlet 20. The top rim 262 extends upward at an angle from the first groove wall 23 towards the second groove wall 24, with an inclination angle of α, where 6° < α < 15°. This design ensures that oil droplets at the edge of the air inlet 20 can be quickly guided away along the top rim 262. Figure 7The oil droplets, marked with a "→", fall onto the inclined upper sidewall 21 and top edge 262, are guided to the sidewalls of the first sidewall 23 and the annular edge 26, and then to the lower sidewall 22. After passing through the oil drip hole below the lower sidewall 22, they enter the oil cup 300, improving the oil guiding effect and preventing the range hood from dripping or leaking oil.

[0050] In a preferred embodiment of this utility model, such as Figure 2-5 The sum of the areas of the openings of the two guide grooves 2 shown is S1, and the area of ​​the opening of the smoke collection chamber 1 is S2, where 0.55≤S1 / S2≤0.8. Firstly, the entire smoke collection hood has a large-area concave smoke collection chamber 1. During smoke extraction, a strong negative pressure area can be formed within the smoke collection chamber 1, accelerating the removal of oil fumes. Furthermore, the smoke collection chamber 1 has a triangular design with air guides on all four sides. Oil fumes are quickly drawn away along the guide surfaces, and downward pressure is generated above the air inlet 20. When oil fumes rise, more oil fumes are trapped, reducing their escape. The guide grooves 2 occupy a large area, effectively covering the oil fumes. The guides and acceleration through their walls further increase the negative pressure area, trapping more oil fumes, improving air intake, enhancing smoke extraction capacity, and reducing oil fume escape.

[0051] In a preferred embodiment of this utility model, such as Figure 1-2 The smoke collection chamber 1 shown includes: a bottom wall 12, a left side wall 13, a right side wall 14, and a rear side wall 11. The bottom wall 12 is gradually inclined upwards from the outside to the inside. The left side wall 13 extends inwards from the left side of the front opening and towards the middle of the smoke collection chamber 1. The right side wall 14 extends inwards from the right side of the front opening and towards the middle of the smoke collection chamber 1. The rear side wall 11 connects the rear ends of the bottom wall 12, the left side wall 13, and the right side wall 14. The rear side wall 11 is inclined inwards and backwards from the top edge of the smoke collection hood 5. The plane containing the rear side wall 11 and the opening plane of the smoke collection chamber 1 form an angle β, where 5°≤β≤10°. Figure 7 As can be seen from the image, the entire smoke collection chamber 1 has a wedge-shaped structure, and its longitudinal cross-section is triangular. This creates downward pressure at the top of the air inlet 20, trapping more smoke as it rises and reducing its escape. Furthermore, since the bottom wall 12, left side wall 13, and right side wall 14 are all inclined, they can all serve as air guiding surfaces, allowing the smoke to be quickly drawn away along these surfaces, further minimizing its escape.

[0052] Preferably, a transition section is provided between any two adjacent sidewalls of the bottom wall 12, left sidewall 13, right sidewall 14 and rear sidewall 11, which can reduce internal stress concentration during molding and avoid cracking.

[0053] Preferably, the smoke hood housing 100 is provided with a drive assembly for driving the smoke collection panel to rotate. The top two sides of the rear side wall 11 are provided with through holes 111 for the drive assembly to pass through. The area of ​​the rear side wall 11 between the two air guide slots 2 is provided with a stepped hole 112. The inner side of the stepped hole 112 is connected to a limiting plate 113. The stepped hole 112 can be used to install the lamp cover 200. By placing the housing of the lamp cover 200 on the stepped surface for initial positioning, the limiting plate 113 can further position and fix the lamp cover 200. The limiting plate 113 is L-shaped, and a reinforcing rib 1131 is connected between the horizontal and vertical sections of the limiting plate 113 to improve the structural strength and ensure the installation stability of the lamp cover 200.

[0054] In a preferred embodiment of this utility model, such as Figure 1-2 The lower edge of the bottom wall 12 shown is provided with a first flange 121 for connecting with the range hood housing 100. The first flange 121 has multiple oil drain holes 122 on the side near the range hood housing 100, and each oil drain hole 122 has a second flange 123 extending into the range hood housing 100. For example... Figure 1-2 The oil leak hole 122 shown is trapezoidal, as... Figure 7 As shown, the oil on the surface of the smoke hood can flow into the oil cup 300 through the oil drain hole 122; in addition, a second flange 123 is designed around the oil drain hole 122 to provide reinforcement.

[0055] This utility model embodiment provides a range hood smoke collection method, such as... Figure 6-8 As shown, the range hood includes a smoke collection hood, a range hood housing 100, and an oil cup 300 as described above. The smoke collection hood is connected to the front opening of the range hood housing 100, and the oil cup 300 is connected to the lower part of the range hood housing 100. The triangular smoke collection chamber 1 and the large-area concave smoke collection structure on the smoke collection hood can form a strong negative pressure area in the smoke collection chamber 1, which accelerates the absorption of oil fumes. This can also generate downward pressure on the upper part of the air inlet 20. When oil fumes rise, they can lock in more oil fumes and reduce the escape of oil fumes. Figure 6 The "↑" in the text represents the direction of smoke movement, from... Figure 6 As can be seen, the inclined front walls of the range hood casing 100 and oil cup 300 can guide the flow of fumes, allowing the smoke to rise more smoothly. Simultaneously, the fumes can enter the air inlet 20 along the front wall. The two guide grooves 2 and the air inlet 20 have a continuously tapering structure along the direction of smoke flow, creating a strong negative pressure area within the smoke collection chamber 1. This accelerates the removal of fumes, improves air intake, enhances smoke extraction capacity, reduces motor speed and power, achieving the effect of quickly removing fumes and reducing noise. Furthermore, the walls of the guide grooves 2 can also guide the fumes on the smoke collection hood, such as... Figure 7The "→" in the figure represents the direction of movement of the oil droplets. The oil droplets fall on the inclined upper side wall 21 and are guided to the first side wall 23 and then to the lower side wall 22. After that, they enter the oil cup 300 through the oil drip hole below the lower side wall 22, which improves the oil guiding effect and avoids the problem of oil dripping and leakage from the range hood.

[0056] In a preferred embodiment of this utility model, such as Figure 6 and 7 The cross-sections of the range hood housing 100 and the oil cup 300 shown in the figure gradually decrease from top to bottom. As can be seen from the figure, both the range hood housing 100 and the oil cup 300 of this application have a trapezoidal design that is wider at the top and narrower at the bottom. This allows the bottom of the range hood to be closer to the wall and further away from the pot than ordinary range hoods, resulting in a larger smoke collection area and a greater smoke collection volume. It also allows the smoke to rise more smoothly and be guided to the air inlet 20 by the front sides of the range hood housing 100 and the oil cup 300. In addition, the main flue's wider-at-the-top and narrower-at-the-bottom shape allows the negative pressure to shift downwards. Because the lower end has less space, the pressure is higher, resulting in stronger suction and faster smoke intake into the range hood's internal cavity. The upper end of the main flue has more space and lower pressure, resulting in a smoother smoke flow, reducing the impact of airflow on the internal impeller and reducing noise. Furthermore, the smaller the lower end of the oil cup 300, the smaller its bottom surface, which reduces the accumulation of condensed oil on the bottom surface.

[0057] In this embodiment of the invention, the term "multiple" refers to two or more, unless otherwise explicitly defined. The terms "install," "connect," and "fix" should be interpreted broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention based on the specific circumstances.

[0058] In the description of the embodiments of this utility model, it should be understood that the terms "upper" and "lower" 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 the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0059] In the description of this specification, the terms "an embodiment," "a preferred embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A smoke collection hood, characterized in that, The smoke collecting hood is connected to the front opening of the range hood housing (100), and the smoke collecting hood includes a smoke gathering cavity (1), the cavity of which is recessed towards the inside of the range hood housing (100), the longitudinal section of the smoke gathering cavity (1) is triangular, and the smoke gathering cavity (1) includes a rear side wall (11); two guiding grooves (2), respectively formed by recessing from the rear side wall (11) towards the inside of the range hood housing (100); an air inlet (20) is provided at the bottom of each guiding groove (2), wherein, the flow-through area of the guiding groove (2) is in a continuously tapered structure along the flue gas flow direction, and at least one groove wall of the guiding groove (2) forms an inclined guiding surface to guide the flue gas to the air inlet (20).

2. The smoke collection hood according to claim 1, characterized in that, The two guiding grooves (2) are symmetric left and right, and each guiding groove (2) includes:[[]] an upper groove wall (21), located at the upper part of the smoke gathering cavity, including two oppositely arranged first ends and second ends, the second end is located in the middle of the smoke gathering cavity (1), and the first end extends obliquely downward along the direction away from the middle of the smoke gathering cavity (1); a lower groove wall (22), located below the upper groove wall (21); a first groove wall (23), with its top connected to the first end and its bottom connected to the lower groove wall (22); a second groove wall (24), with its top connected to the second end and its bottom connected to the lower groove wall (22); wherein, the upper groove wall (21), the first groove wall (23), the lower groove wall (22) and the second groove wall (24) all extend obliquely from the groove opening of the guiding groove (2) towards the middle of the groove bottom, so that the flow-through cross-section of the guiding groove (2) is continuously tapered.[[]] 3. The smoke collection hood according to claim 2, characterized in that, The included angle between the first groove wall (23) and the rear side wall (11) is a, the included angle between the upper groove wall (21) and the rear side wall (11) is b, the included angle between the second groove wall (24) and the rear side wall (1) is c, and the included angle between the lower groove wall (22) and the rear side wall (11) is d, wherein, a < b, b < c and b < d.[[]] 4. The smoke collection hood according to claim 2, characterized in that, Arc-shaped transition sections (25) are provided between the upper groove wall (21) and the first groove wall (23), between the first groove wall (23) and the lower groove wall (22), between the lower groove wall (22) and the second groove wall (24), and between the second groove wall (24) and the upper groove wall (21).[[]] 5. The smoke collection hood according to claim 2, characterized in that, On the side of the bottom of the guiding groove (2) close to the inside of the range hood housing (100), an annular edge (26) surrounding the air inlet (20) is provided, and a bending part (261) folded towards its outer peripheral surface is provided at the free end of the annular edge (26).[[]] 6. The smoke collection hood according to claim 5, characterized in that, The annular edge (26) includes a top edge (262) located at the top of the air inlet (20), and the top edge (262) extends obliquely upward from the first groove wall (23) towards the second groove wall (24), and the inclination angle of the top edge (262) is α, wherein, 6° < α < 15°.[[]] 7. The smoke collection hood according to claim 1, characterized in that, The sum of the areas of the groove openings of the two guiding grooves (2) is S1, and the area of the cavity opening of the smoke gathering cavity (1) is S2, wherein, 0.55 ≤ S1 / S2 ≤ 0.8.[[]] 8. The smoke collection hood according to claim 1, characterized in that, The smoke collection chamber (1) includes: The bottom wall (12) is set to gradually slope upward from the outside to the inside; The left side wall (13) extends inward from the left side of the front opening and extends toward the middle of the smoke collection chamber (1); The right side wall (14) extends inward from the right side of the front opening and extends toward the middle of the smoke collection chamber (1); The rear sidewall (11) is connected to the rear end of the bottom wall (12), the left side wall (13) and the right side wall (14). The rear sidewall (11) is inclined from top to bottom and rearward. The plane of the rear sidewall (11) and the plane of the smoke collection chamber (1) form an angle β, where 5°≤β≤10°.

9. The smoke collection hood according to claim 8, characterized in that, The lower edge of the bottom wall (12) is provided with a first flange (121) for connecting with the range hood housing (100). The first flange (121) is provided with a plurality of oil leakage holes (122) on the side near the range hood housing (100). Each oil leakage hole (122) is provided with a second flange (123) extending into the range hood housing (100).

10. A range hood, characterized in that, Includes the smoke hood as described in any one of claims 1-9.

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