Range hood

Abstract

The present invention provides a range hood, which relates to the technical field of kitchen appliances and includes a smoke collecting cavity and an arc-shaped baffle; the smoke collecting cavity is located at the front end of the range hood housing, the arc-shaped baffle is arranged at the air inlet of the smoke collecting cavity, and the arc-shaped baffle protrudes in a direction away from the smoke collecting cavity; a lower smoke suction port is provided on the arc-shaped baffle, and there is a gap between the upper end of the arc-shaped baffle and the smoke collecting cavity, and this gap forms an upper smoke suction port. When in use, the lower smoke suction port is relatively close to the oil fume source, and the oil fume can be quickly sucked in. And through the flow-around effect of the arc-shaped baffle on the oil fume, the escaping oil fume is sucked in from the upper smoke suction port, forming a three-dimensional smoke suction structure, improving the smoke suction effect. At the same time, the arc-shaped baffle is connected to the air inlet of the smoke collecting cavity. While collecting and gathering the oil fume, it will not block the user's line of sight, and there is no need for a mechanical structure to flip it, saving manufacturing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and particularly to a range hood. Background Art

[0002] The current range hood's smoke suction and exhaust effect is mainly determined by the overall appearance of the range hood. Changing the shape of the range hood and improving its smoking effect are important research topics.

[0003] Currently, in order to improve the smoking effect of side suction range hoods, baffles are provided at the front end of the air inlet. Most of the baffles are designed to rotate and open, using the opened baffles to gather the oil fume. When the rising oil fume contacts the smoke collecting cavity of the range hood, it flows along the smoke collecting cavity and is finally sucked in from the air inlet of the smoke collecting cavity, thus ensuring the smoking effect of the range hood.

[0004] However, the disadvantages of the above-mentioned side suction range hoods include: the air inlet of the side suction range hood is arranged in the middle of the smoke collecting cavity. The unfolded baffle can gather the oil fume in the front and back directions, but it is easy to cause the oil fume on both sides to escape. The flipping of the baffle needs to be realized by corresponding mechanical structures, which will cause problems such as increased production costs and blocked user sightlines. Summary of the Invention

[0005] The purpose of the present invention is to provide a range hood to alleviate the technical problems in the prior art that the unfolded baffle can gather the oil fume in the front and back directions, but it is easy to cause the oil fume on both sides to escape, and the flipping of the baffle needs to be realized by corresponding mechanical structures, which will cause increased production costs and blocked user sightlines.

[0006] The range hood provided by the present invention includes a smoke collecting cavity and an arc-shaped baffle;

[0007] The smoke collecting cavity is located at the front end of the range hood housing. The arc-shaped baffle is arranged at the air inlet of the smoke collecting cavity, and the arc-shaped baffle protrudes in a direction away from the smoke collecting cavity; a lower smoke suction port is provided on the arc-shaped baffle, and there is a gap between the upper end of the arc-shaped baffle and the smoke collecting cavity, and this gap forms an upper smoke suction port.

[0008] Further, the number of the lower smoke suction ports is two, and they are arranged at intervals in the horizontal direction.

[0009] Further, the horizontal distance Z between the two lower smoke suction ports satisfies: 80mm ≤ Z ≤ 180mm.

[0010] Further, the bottom end of the arc-shaped baffle is provided with a first cutting edge and a second cutting edge, and the first cutting edge extends from the lower end surface of the arc-shaped baffle towards one side surface of the arc-shaped baffle. The gap between the first cutting edge and the smoke collecting cavity forms one of the lower smoke suction ports;

[0011] The second cutting edge extends from the lower end surface of the arc-shaped baffle towards the other side surface of the arc-shaped baffle, and a gap between the second cutting edge and the smoke collecting cavity forms another lower smoke suction port.

[0012] Furthermore, each of the lower smoke suction ports includes a plurality of through holes arranged at intervals.

[0013] Furthermore, the upper end of the arc-shaped baffle extends into the interior of the smoke collecting cavity.

[0014] Furthermore, the ratio of the sagitta to the chord length of the arc-shaped baffle is 0.15 - 0.4.

[0015] Furthermore, the distance X between the outer edge of the arc-shaped baffle and the rear plate of the range hood housing satisfies: 250mm ≤ X ≤ 350mm.

[0016] Furthermore, the ratio of the area of the lower smoke suction port to the sum of the areas of the upper smoke suction port and the lower smoke suction port is 0.6 - 0.9.

[0017] Furthermore, the arc-shaped baffle includes a plurality of curved surface units connected in sequence, and the plurality of curved surface units all protrude away from the smoke collecting cavity.

[0018] The range hood provided by the present invention includes a smoke collecting cavity and an arc-shaped baffle; the smoke collecting cavity is located at the front end of the range hood housing, the arc-shaped baffle is arranged at the air inlet of the smoke collecting cavity, and the arc-shaped baffle protrudes towards the direction away from the smoke collecting cavity; a lower smoke suction port is provided on the arc-shaped baffle, and there is a gap between the upper end of the arc-shaped baffle and the smoke collecting cavity, and this gap forms an upper smoke suction port.

[0019] During use, the lower smoke suction port is relatively close to the oil fume source, and can quickly suck in the oil fume. The arc-shaped baffle can suck in the escaping oil fume from the upper smoke suction port through the flow-around effect on the oil fume, forming a three-dimensional smoke suction structure, improving the smoke suction effect. At the same time, the arc-shaped baffle is connected to the air inlet of the smoke collecting cavity, while collecting and gathering the oil fume, it will not block the user's line of sight, and there is no need for a mechanical structure to flip it, saving manufacturing costs. Description of the Drawings

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a structural diagram of the range hood provided in Embodiment 1 of the present invention;

[0022] Figure 2 The front view of the range hood provided in the first embodiment of the present invention;

[0023] Figure 3 The side view of the range hood provided in the first embodiment of the present invention;

[0024] Figure 4 The front view of the range hood provided in the second embodiment of the present invention;

[0025] Figure 5 The side view of the range hood provided in the second embodiment of the present invention;

[0026] Figure 6 The front view of the range hood provided in the third embodiment of the present invention;

[0027] Figure 7 The side view of the range hood provided in the third embodiment of the present invention;

[0028] Figure 8 The front view of the range hood provided in the fourth embodiment of the present invention;

[0029] Figure 9 The side view of the range hood provided in the fourth embodiment of the present invention.

[0030] Icon: 1 - Smoke collecting cavity; 2 - Arc-shaped baffle; 3 - Buckle structure; 4 - Oil net; 5 - Range hood housing; 6 - Fixed seat; 7 - Fan; 8 - Rear plate of the range hood housing;

[0031] B1 - Lower smoke suction port; B2 - Upper smoke suction port. Detailed implementation manners

[0032] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Embodiment 1

[0034] As Figures 1 to 3 shown, the range hood provided in this embodiment includes a smoke collecting cavity 1 and an arc-shaped baffle 2.

[0035] The smoke collecting cavity 1 is located at the front end of the range hood housing 5, the arc-shaped baffle 2 is arranged at the air inlet of the smoke collecting cavity 1, and the arc-shaped baffle 2 protrudes in a direction away from the smoke collecting cavity 1; a lower smoke suction port B1 is provided on the arc-shaped baffle 2, and there is a gap between the upper end of the arc-shaped baffle 2 and the smoke collecting cavity 1, and this gap forms an upper smoke suction port B2.

[0036] During use, the lower smoke suction port B1 is relatively close to the oil fume source, which can quickly suck in the oil fume. Through the flow-around effect of the arc-shaped baffle 2 on the oil fume, the escaping oil fume is sucked in from the upper smoke suction port B2, forming a three-dimensional smoke suction structure and improving the smoke suction effect. At the same time, the arc-shaped baffle 2 is arranged at the air inlet of the smoke collecting cavity 1. While collecting and gathering the oil fume, it will not block the user's line of sight, and there is no need for a mechanical structure to flip it, saving manufacturing costs.

[0037] Specifically, the range hood includes a smoke collecting cavity 1, an arc-shaped baffle 2, a range hood housing 5, a fan 7 and an oil mesh 4. Among them, the smoke collecting cavity 1 is surrounded by a smoke collecting cover, and the smoke collecting cover can be fixed to the front end of the range hood housing 5, so that the smoke collecting cavity 1 is located at the front end of the range hood housing 5. The two sides of the arc-shaped baffle 2 are fixedly connected to the side walls on both sides of the smoke collecting cavity 1 through a buckle structure 3. A fixing seat 6 is arranged on the rear side wall of the smoke collecting cavity 1, and the lower end of the arc-shaped baffle 2 is installed on the fixing seat 6. The inner side of the arc-shaped baffle 2 is connected to the inner side of the smoke collecting cavity 1 through a buckle structure 3. The oil mesh 4 is arranged on the back of the arc-shaped baffle 2 and is installed in the smoke collecting cavity 1 for filtering the inhaled oil fume. The fan 7 is installed inside the range hood housing 5 at the rear end of the oil mesh 4.

[0038] Further, the ratio of the bow height to the chord length of the arc-shaped baffle 2 is 0.15 - 0.4.

[0039] In this embodiment, the arc-shaped baffle 2 adopts a structural design of a convex curved surface, which can solve the contradiction between the space line of sight and smoke gathering. The ratio of the bow height to the chord length of the arc-shaped baffle 2 is between 0.15 and 0.4. This is because when the ratio of the bow height to the chord length is less than 0.15, the smoke gathering area of the baffle is small, affecting the overall smoke suction effect of the machine; when the ratio of the bow height to the chord length is greater than 0.4, the smoke suction effect does not increase significantly at this time, but the spatial dimension of the arc-shaped baffle 2 is large, and the user's space line of sight during cooking is poor and the sense of depression is strong. When the ratio of the bow height to the chord length is between 0.15 and 0.4, it can not only meet the smoke suction requirements but also solve the problem of poor space line of sight during cooking.

[0040] Further, the upper end of the arc-shaped baffle 2 extends into the smoke collecting cavity 1.

[0041] Preferably, the number of the lower smoke suction ports B1 is two, and they are arranged at intervals in the horizontal direction.

[0042] Further, the horizontal distance Z between the two lower smoke suction ports B1 satisfies: 80mm ≤ Z ≤ 180mm.

[0043] Further, the bottom end of the arc-shaped baffle 2 is provided with a first cutting edge and a second cutting edge, and the first cutting edge extends from the lower end surface of the arc-shaped baffle 2 towards one side surface of the arc-shaped baffle 2. The gap between the first cutting edge and the smoke collecting cavity 1 forms one of the lower smoke suction ports B1.

[0044] The second cutting edge extends from the lower end surface of the arc-shaped baffle 2 towards the other side surface of the arc-shaped baffle 2, and the gap between the second cutting edge and the smoke collecting chamber 1 forms another lower smoke suction port B1.

[0045] Specifically, one end of the first cutting edge is located at a position to the left of the center of the bottom of the arc-shaped baffle 2, and the other end of the first cutting edge is located on the left side surface of the arc-shaped baffle 2. Similarly, one end of the second cutting edge is located at a position to the right of the center of the bottom of the arc-shaped baffle 2, and the other end of the second cutting edge is located on the right side surface of the arc-shaped baffle 2. Preferably, the other end of the first cutting edge is located at the middle position of the left side surface of the arc-shaped baffle 2, and the other end of the second cutting edge is located at the middle position of the right side surface of the arc-shaped baffle 2. The first cutting edge and the second cutting edge are symmetrically arranged in the left-right direction of the arc-shaped baffle 2.

[0046] Further, the distance X between the outer edge of the arc-shaped baffle 2 and the rear plate 8 of the range hood housing satisfies: 250 mm ≤ X ≤ 350 mm.

[0047] In this embodiment, the distance between the outer edge of the convex curved surface of the arc-shaped baffle 2 and the rear plate 8 of the range hood housing is X, and its value ranges between 250 mm and 350 mm. When X ≤ 250 mm, its smoke suction effect is affected. When X ≥ 350 mm, the space of the range hood will also become larger, and the sense of depression of the user will increase. At the same time, the convex curved surface design can make the distance between the arc-shaped baffle 2 and the air inlet of the fan 7 relatively far, which can reduce the air volume loss of the fan 7.

[0048] Both sides of the bottom end of the arc-shaped baffle 2 are designed with cutting edges, such as Figure 2As shown, the line connecting points C and D forms the above-mentioned first cutting edge and second cutting edge, thus forming two lower smoke suction ports B1 on the left and right sides. Point C is at the outermost edges on the left and right sides of the arc-shaped baffle 2, and its distance from the rear end of the machine body is equivalent to the distance X value between the outer edge of the convex curved surface of the arc-shaped baffle 2 and the rear plate 8 of the range hood housing. At this time, the longitudinal smoke gathering area is relatively large, and a better smoke suction effect can be obtained. Along the horizontal direction, the distance between the two lower smoke suction ports B1 is Z, and its size is between 80 mm and 180 mm. When Z is less than 80 mm, the area of the lower smoke suction port B1 increases, and the flow rate of the oil fume decreases. At this time, the smoke suction effect will decrease, and the oil path of the range hood will also be affected. When Z is greater than 180 mm, at this time, the smoke suction port deviates from the position where the oil fume rises from the cooking stove, which is likely to cause local smoke leakage in the middle part, and the smoke suction effect will also decrease. At the same time, the upper edge of the arc-shaped baffle 2 is embedded in the smoke collecting cavity 1 and maintains a certain gap with the smoke collecting cavity 1, that is, the illustrated Y, thus forming an upper smoke suction port B2. During cooking, the oil fume diffuses upward. Most of the oil fume A1 is captured by the lower smoke suction port B1 and is inhaled into the inlet of the fan 7 from both left and right sides. Part of the escaped oil fume A2 impacts the surface of the arc-shaped baffle 2 and will move upward along the arc-shaped curved surface due to the flow-around effect. The vertical flow rate gradually decreases, and finally it is horizontally inhaled at the upper smoke suction port B2.

[0049] Further, the ratio of the area of the lower smoke suction port B1 to the sum of the areas of the upper smoke suction port B2 and the lower smoke suction port B1 is 0.6 - 0.9.

[0050] In this embodiment, the ratio of the area of the lower smoke suction port B1 to the area of the entire smoke suction port (i.e., the upper smoke suction port B2 + the lower smoke suction port B1) is between 0.6 and 0.9. When it is greater than 0.9, the flow rate of the upper smoke suction port B2 decreases, and the escaped oil fume cannot be sucked in time, thus affecting the smoke suction effect. When it is less than 0.6, the flow rate of the lower smoke suction port B1 is relatively low, and part of the oil fume cannot be pulled to the vicinity of the arc-shaped baffle 2 and will directly diffuse during the rising process, resulting in a decrease in the smoke suction effect of the whole machine. Controlling the ratio of the upper smoke suction port B2 to the entire smoke suction port can better control the air volume ratio or flow rate of the lower smoke suction port B1 and the upper smoke suction port B2, thus achieving a better smoke suction effect.

[0051] The smoking effect is simulated and calculated by the STAR-CCM+ tool. The specific results are shown in the following table. It can be seen from the table that the simulation is based on the distance X between the outer edge of the arc-shaped baffle 2 and the rear plate 8 of the range hood housing being 300 mm, and the distance Z between the two lower smoking ports B1 being 150 mm. When a certain value within the range of 0.15 - 0.4 of the ratio of the height of the arc of the arc-shaped baffle 2 to its chord length is fixed, as the ratio of the area of the lower smoking port B1 to the area of the entire smoking port (i.e., the upper smoking port B2 + the lower smoking port B1) increases, the smoking effect improves. However, when the ratio of the area of the lower smoking port B1 to the area of the entire smoking port (i.e., the upper smoking port B2 + the lower smoking port B1) exceeds 0.9, the decline is relatively obvious. When the ratio of the area of the lower smoking port B1 to the area of the entire smoking port (i.e., the upper smoking port B2 + the lower smoking port B1) is 0.5, as the ratio of the height of the arc of the arc-shaped baffle 2 to its chord length gradually increases within the range of 0.15 - 0.4, the smoking effect gradually improves; when the ratio of the area of the lower smoking port B1 to the area of the entire smoking port (i.e., the upper smoking port B2 + the lower smoking port B1) is 0.8, as the ratio of the height of the arc of the arc-shaped baffle 2 to its chord length gradually increases within the range of 0.15 - 0.4, the smoking effect first gradually improves and then declines. Therefore, the ratio of the height of the arc of the arc-shaped baffle 2 to its chord length and the ratio of the area of the lower smoking port B1 to the area of the entire smoking port (i.e., the upper smoking port B2 + the lower smoking port B1) can be reasonably selected within the above two range intervals to achieve the optimal smoking effect. In the above table, when the ratio of the height of the arc of the arc-shaped baffle 2 to its chord length is 0.35 and the ratio of the area of the lower smoking port B1 to the area of the entire smoking port (i.e., the upper smoking port B2 + the lower smoking port B1) is 0.8, the smoking effect reaches 86.3%. This design preferably solves the problems of insufficient smoking effect of the fixed baffle, relatively high cost of the flip baffle, and blocking of the line of sight.

[0052]

[0053] The range hood provided in this embodiment adopts an arc-shaped baffle 2 with a fixed convex design, which solves the contradiction between the smoking effect and the space size. It can not only reduce the resistance at the inlet end of the fan 7 but also ensure the smoking effect. The two sides at the lower end of the arc-shaped baffle 2 adopt a trimming design to form two lower smoking ports B1. At the same time, there is a gap between the upper end of the arc-shaped baffle 2 and the smoke collecting cavity 1 to form an upper smoking port B2. The horizontal smoking of the upper smoking port B2 and the upward smoking on both sides of the lower smoking port B1 form a three-dimensional and multi-angle air inlet mode. By controlling the areas of the upper smoking port B2 and the lower smoking port B1, the air volume ratio or flow rate of the upper smoking port B2 and the lower smoking port B1 can be arbitrarily controlled.

[0054] Embodiment 2

[0055] As Figure 4 and Figure 5As shown, the difference from the first embodiment is that, further, the arc-shaped baffle 2 includes a plurality of curved surface units connected in sequence, and all of the plurality of curved surface units protrude away from the smoke collecting cavity 1.

[0056] Specifically, the arc-shaped baffle 2 can be designed in a structure form where a plurality of curved surface units are connected in sequence. Using a plurality of curved surface units to replace the single curved surface in the technical solution of the first embodiment, due to the structure of using a plurality of curved surface units, the resistance coefficient of the arc-shaped baffle 2 can be increased. When the oil fume flows on this surface, the flow velocity decreases, which allows the range hood to have enough time to suck in the oil fume generated during cooking. Therefore, the smoking effect of the plurality of curved surface units is better than that of the single curved surface.

[0057] Embodiment Three

[0058] As Figure 6 and Figure 7 shown, the difference from the first embodiment is that, further, each of the lower smoke inlets B1 includes a plurality of through holes arranged at intervals. In this embodiment, the through holes can be strip-shaped through holes, and the plurality of strip-shaped through holes are arranged in parallel.

[0059] In the first embodiment, the lower smoke inlet B1 is formed by adopting a structural form of setting a first cutting edge and a second cutting edge on the bottom end surface of the arc-shaped baffle 2. In this embodiment, an opening design can be carried out on both sides of the lower end of the arc-shaped baffle 2. Using the opening design to replace the cutting edge design of the first embodiment, each shaped hole is composed of a plurality of strip-shaped through holes arranged at intervals, and the plurality of strip-shaped through holes are arranged in parallel longitudinally, thereby forming two lower smoke inlets B1 arranged at intervals in the horizontal direction.

[0060] In this embodiment, the ratio of the area of the two lower smoke inlets B1 to the area of the entire smoke inlet (i.e., the upper smoke inlet B2 + the lower smoke inlet B1) is still between 0.6 and 0.9, maintaining the integrity of the arc-shaped baffle 2. At the same time, the arc-shaped baffle 2 also has the function of the oil screen 4. There is still a certain gap between the upper end of the arc-shaped baffle 2 and the smoke collecting cavity 1. Since the openings on both sides of the lower end are closer to the oil fume, the oil fume can be pulled to the vicinity of the arc-shaped baffle 2, and most of the oil fume is directly sucked into the range hood through these mesh holes. Some of the escaped oil fume will move upward along the curved surface of the arc-shaped baffle due to the flow-around effect and is finally sucked in at the upper smoke inlet B2. Therefore, the smoking effect of this solution can be guaranteed.

[0061] Embodiment Four

[0062] As Figure 8 and Figure 9 shown, the difference from the third embodiment is that, further, the arc-shaped baffle 2 includes a plurality of curved surface units connected in sequence, and all of the plurality of curved surface units protrude away from the smoke collecting cavity 1.

[0063] Specifically, the technical solution provided in this embodiment is a further improvement based on Embodiment 3. The single curved surface of the arc-shaped baffle 2 is improved to a structure form in which multiple curved surface units are connected in sequence. Using multiple curved surface units instead of a single curved surface can increase the drag coefficient of the outer surface of the arc-shaped baffle 2. When the oil fume flows on this surface, the flow rate decreases, enabling the range hood to have sufficient time to suck in the oil fume generated during cooking. Therefore, the smoking effect of multiple curved surface units is better than that of a single curved surface.

[0064] The range hood provided by the present invention adopts a three-dimensional smoking port design, with a good smoking effect; the smoking port is arranged on the baffle of the convex curved surface. The arc-shaped baffle 2 not only takes into account the smoking effect but also does not block the user's line of sight and occupies less space; the arc-shaped baffle 2 is fixed, taking into account both cost and smoking effect.

[0065] In summary, the range hood provided by the present invention includes a smoke collecting cavity 1 and an arc-shaped baffle 2; the smoke collecting cavity 1 is located at the front end of the range hood housing 5, the arc-shaped baffle 2 is arranged at the air inlet of the smoke collecting cavity 1, and the arc-shaped baffle 2 protrudes away from the smoke collecting cavity 1; a lower smoking port B1 is provided on the arc-shaped baffle 2, and there is a gap between the upper end of the arc-shaped baffle 2 and the smoke collecting cavity 1, and this gap forms an upper smoking port B2. During use, the lower smoking port B1 is relatively close to the oil fume source, and the oil fume can be quickly sucked in. And through the flow-around effect of the arc-shaped baffle 2 on the oil fume, the escaped oil fume is sucked in from the upper smoking port B2, forming a three-dimensional smoking structure and improving the smoking effect. At the same time, the arc-shaped baffle 2 is connected to the air inlet of the smoke collecting cavity 1, which can collect and gather the oil fume while not blocking the user's line of sight, and there is no need for a mechanical structure to flip it, saving manufacturing costs.

[0066] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oil fume extractor, characterized in that, it includes a smoke collecting cavity (1) and an arc-shaped baffle (2); the smoke collecting cavity (1) is located at the front end of the smoke machine housing (5), the arc-shaped baffle (2) is arranged at the air inlet of the smoke collecting cavity (1), and the arc-shaped baffle (2) protrudes towards the direction away from the smoke collecting cavity (1); a lower smoke suction port (B1) is provided on the arc-shaped baffle (2), and there is a gap between the upper end of the arc-shaped baffle (2) and the smoke collecting cavity (1), and this gap forms an upper smoke suction port (B2); the arc-shaped baffle (2) includes a plurality of curved surface units connected in sequence, and a plurality of the curved surface units all protrude towards the direction away from the smoke collecting cavity (1); the oil fume extractor includes a smoke collecting hood, and the smoke collecting hood is fixed inside the housing (5) and located at the front end of the housing (5); the number of the lower smoke suction ports (B1) is two, and they are arranged at intervals in the horizontal direction; the bottom end of the arc-shaped baffle (2) is provided with a first cutting edge and a second cutting edge, and the first cutting edge extends from the lower end surface of the arc-shaped baffle (2) towards one side surface of the arc-shaped baffle (2), and the gap between the first cutting edge and the smoke collecting cavity (1) forms one of the lower smoke suction ports (B1); the second cutting edge extends from the lower end surface of the arc-shaped baffle (2) towards the other side surface of the arc-shaped baffle (2), and the gap between the second cutting edge and the smoke collecting cavity (1) forms the other lower smoke suction port (B1).

2. The oil fume extractor according to claim 1, characterized in that, the horizontal distance Z between the two lower smoke suction ports (B1) satisfies: 80mm ≤ Z ≤ 180mm.

3. The oil fume extractor according to claim 1, characterized in that, each of the lower smoke suction ports (B1) includes a plurality of through holes arranged at intervals.

4. The oil fume extractor according to any one of claims 1-3, characterized in that, the upper end of the arc-shaped baffle (2) extends into the interior of the smoke collecting cavity (1).

5. The oil fume extractor according to any one of claims 1-3, characterized in that, the ratio of the height of the arc of the arc-shaped baffle (2) to the chord length is 0.15 - 0.

4.

6. The oil fume extractor according to any one of claims 1-3, characterized in that, the distance X between the outer edge of the arc-shaped baffle (2) and the rear plate (8) of the smoke machine housing satisfies: 250mm ≤ X ≤ 350mm.

7. The oil fume extractor according to any one of claims 1-3, characterized in that, the ratio of the area of the lower smoke suction port (B1) to the sum of the areas of the upper smoke suction port (B2) and the lower smoke suction port (B1) is 0.6 - 0.9.

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