A range hood

Abstract

The present invention relates to a range hood, comprising a shell and a fan system arranged in the shell, wherein the lower part of the shell has a vertically extending smoke inlet chamber, the front side wall of the lower part of the shell is provided with a smoke inlet port connected to the smoke inlet chamber, the upper part of the shell has a smoke collecting chamber connected to the smoke inlet chamber, the smoke collecting chamber extends forward to form an installation chamber for installing the fan system, the air inlet of the fan system is connected to the smoke collecting chamber, and the air outlet of the fan system is arranged upward. The rear wall of the shell of the range hood of the present invention is mounted against a wall, and since the smoke inlet chamber at the lower part of the shell extends vertically, the width of the smoke inlet chamber in the front-to-back direction can be made thinner, and can extend downward to be sufficiently close to a stove and a source of oil smoke, so that the oil smoke is quickly sucked into the upper row of the smoke inlet chamber as soon as it is generated, thereby improving the oil smoke extraction effect.

Description

Technical Field

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

[0002] Range hoods are an indispensable appliance in the kitchen today. The more common and widely used ones are the upper exhaust fume purification systems.

[0003] At present, the upper exhaust fume purification system is mainly divided into two categories: top suction range hood and close suction range hood. Top suction range hood is more beautiful, but its smoke inlet is higher and the smoke extraction effect is limited; compared with top suction range hood, close suction range hood has a lower smoke inlet, but due to the influence of the appearance structure and internal air duct structure of close suction range hood, the current close suction range hood cannot get closer to the smoke, which greatly limits its smoke extraction effect.

[0004] For vertically arranged smoke inlet ducts, in order to achieve a larger smoke collection area, the size of the smoke inlet is usually larger than the size of the smoke collection cavity entrance. Figure 1 , 2 As shown, this structural setting has the following problems:

[0005] (1) During the oil fume inhalation process, due to the different distances from the center of the fan 20', the negative pressure on the oil fume on both sides of the smoke inlet 111' is lower than that in the middle of the smoke inlet 111', resulting in uneven overall oil fume absorption effect and oil fume escape on both sides of the smoke inlet 111';

[0006] (2) The oil smoke on both sides moves in the vertical smoke inlet duct. At the junction of the smoke inlet chamber 11' and the smoke collecting chamber 12', the flow channel structure changes significantly, causing the oil smoke movement trajectory to change suddenly and generate vortices. In addition, the vortices will cause the airflow entering the fan to vibrate periodically, resulting in obvious fluctuations in the impeller speed, abnormal noise, and changes in air volume, which in turn affects the oil smoke extraction effect. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a range hood which improves the oil fume extraction effect by making the smoke inlet sufficiently close to the oil fume source in view of the current status of the prior art.

[0008] Another technical problem to be solved by the present invention is to provide a range hood which reduces noise and further improves the fume extraction effect by changing the structure of the smoke inlet chamber in view of the current status of the prior art.

[0009] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a range hood, comprising a shell and a fan system arranged in the shell, characterized in that: the lower part of the shell has a vertically extending smoke inlet chamber, the front side wall of the lower part of the shell is provided with a smoke inlet port connected to the smoke inlet chamber, the upper part of the shell has a smoke collecting chamber connected to the smoke inlet chamber, the smoke collecting chamber extends forward to form an installation chamber for installing the fan system, and the air inlet of the fan system is connected to the smoke collecting chamber.

[0010] As an improvement, the width of at least the upper part of the smoke inlet chamber in the horizontal direction gradually decreases from bottom to top to form a first guide structure. With the above structure, since the width of the smoke inlet chamber gradually narrows as a whole, the overall negative pressure area distribution is more uniform and concentrated. After the oil smoke enters the smoke inlet chamber from the smoke inlet, it gathers along the smoke chamber transitioned by the first guide structure and is sucked into the smoke collecting chamber; at the same time, since the upper part of the smoke inlet chamber is directly connected to the inlet of the smoke collecting chamber, the flow direction of the oil smoke in the smoke chamber is effectively slowed down. Compared with the obvious change of the vertical structure flue under the same situation, the present invention allows the oil smoke to flow smoothly into the smoke collecting chamber, effectively avoiding the formation of partial vortices on both sides of the top of the smoke inlet chamber, and reducing the aerodynamic noise generated thereby.

[0011] Preferably, the upper port of the smoke inlet chamber is connected to the lower port of the smoke collecting chamber, and the lateral width of the upper port of the smoke inlet chamber matches the lateral width of the lower port of the smoke collecting chamber. A better way is to set the upper port of the smoke inlet chamber and the lower port of the smoke collecting chamber to have the same size after the first flow guide structure is set, but considering that a certain assembly margin is required during the assembly process, it is not required that the upper port of the smoke inlet chamber and the lower port of the smoke collecting chamber have completely the same size, as long as the two can be well connected.

[0012] Preferably, the smoke inlet chamber is provided with a first bevel arranged near the first side wall of the smoke inlet chamber and a second bevel arranged near the second side wall, the first bevel gradually inclines from top to bottom toward the first side wall of the smoke inlet chamber, and the second bevel gradually inclines from top to bottom toward the second side wall of the smoke inlet chamber. The arrangement of the first bevel and the second bevel not only facilitates the formation of the first flow guide structure, but also allows the oil droplets accumulated on the top wall and the inner side wall of the smoke inlet chamber to slide down along the bevel, thus avoiding the problem of direct dripping of the oil droplets.

[0013] Preferably, the length L3 of the smoke inlet is greater than the inlet length L2 of the smoke collecting chamber, and L2:L3=1:(1.2 ~ 3). The L2=360 ~ 400mm, and the L3=750 ~ 800mm.

[0014] Preferably, a first sound-absorbing cotton is arranged on the side wall of the first bevel and / or the second bevel located outside the smoke inlet chamber, and correspondingly, a plurality of silencer holes arranged at intervals are provided on the first bevel and / or the second bevel. Further preferably, the first sound-absorbing cotton is attached to the outer side wall of the first bevel and the second bevel, and correspondingly, a plurality of silencer holes arranged at intervals are provided on the first bevel and the second bevel respectively. A second sound-absorbing cotton is arranged on the front side wall of the smoke inlet chamber. Since the smoke inlet chamber air duct of the present invention gradually narrows from bottom to top, it can be known from the Venturi effect that the wind speed in the smoke inlet chamber air duct will gradually increase along the wind flow direction, resulting in relatively higher noise. The first sound-absorbing cotton close to the corresponding inclined plate and the second sound-absorbing cotton arranged close to the front side wall of the smoke inlet chamber are respectively placed on both sides of the air duct, which not only makes reasonable use of the space here, but also has a good noise reduction effect.

[0015] In the above schemes, the fan system is a double air inlet fan system, the rear side of the fan system has a main air inlet arranged toward the smoke collecting chamber, and the front side of the fan system has a secondary air inlet located in the installation cavity.

[0016] As an improvement, a second flow guide structure that gradually slopes downward from front to back is provided on the inner side wall of the smoke collecting chamber near the entrance. Although the setting of the first flow guide structure avoids the generation of vortex at the top of the smoke inlet chamber, there is still a sudden change in the flow channel structure when the oil smoke flows into the junction of the smoke inlet chamber and the smoke collecting chamber, and a vortex will still be formed near the side wall at the entrance of the smoke collecting chamber, and the oil smoke flow rate gradually increases after being guided by the first flow guide structure, and it flows in concentratedly at the entrance of the smoke collecting chamber. Compared with the case where the first flow guide structure is not provided, the degree of oil smoke collision at the entrance of the smoke collecting chamber is even aggravated, which causes the motor speed to fluctuate back and forth by ±20 revolutions, and thus generates a large noise. Moreover, for the fan system with double air inlet, the main air inlet of the fan system is close to the oil fume suction channel, and the secondary air inlet is far from the oil fume suction channel. In the actual oil fume suction process, a large amount of oil fume is sucked in by the main air inlet. Since the smoke collecting chamber will form a vortex at the side wall near the inlet, it affects the flow of oil fume to the secondary air inlet, which not only reduces the oil fume suction efficiency, but also increases the load of the main air inlet, thereby aggravating the negative impact of the vortex at the entrance of the smoke collecting chamber. After setting the above-mentioned second guide structure, the vortex caused by the sudden change of the structure at the junction of the smoke inlet chamber and the smoke collecting chamber is broken, and the influence of the vortex on the fluctuation of the main air inlet is avoided, so that the motor speed is stable and the aerodynamic noise generated thereby is eliminated; at the same time, the second guide structure forms a guide channel between the smoke collecting chamber and the installation chamber, and guides the vortex at the bottom of the original volute into the secondary air inlet to achieve diversion and balance the oil fume flow distribution of the main and secondary air inlets, effectively improving the oil fume suction efficiency of the fan system and further avoiding the formation of aerodynamic noise at the bottom of the volute.

[0017] Preferably, the angle between the second flow-guiding structure and the horizontal plane is α, 9°≤α≤60°. The second flow-guiding structure is respectively arranged on the two inner side walls of the smoke collecting chamber, and the distance between the inner edges of the two second flow-guiding structures is L1, and the width at the entrance of the smoke collecting chamber is L2, 40mm≥L2-L1≥120mm. The above design is conducive to improving the oil smoke diversion effect, and the effect is better when α=30° and L2-L1=60mm.

[0018] Preferably, the second flow-guiding structure has a positioning piece arranged close to the inner wall surface of the smoke collecting chamber and a first bevel gradually extending from the upper edge or the lower edge of the positioning piece to the inner side of the smoke collecting chamber, and the acute angle β formed between the first bevel and the positioning piece is 45° to 90°. The inner edge of the first bevel gradually extends upward to form a second bevel, and the acute angle δ formed between the second bevel and the positioning piece is 0 to 30°. This structure is conducive to improving the oil smoke diversion effect.

[0019] Preferably, a guide groove is formed between the first bevel, the second bevel and the inner side wall of the smoke collecting chamber, which can guide the oil dripping from the inner side wall of the smoke collecting chamber and / or the installation chamber into the rear side of the smoke collecting chamber. The guide groove can effectively increase the flow of oil and prevent the oil from agglomerating, and has a good oil guiding effect. At the same time, the oil originally dripping into the front side of the cavity is guided to the rear, which effectively reduces the oil dripping in front of the air inlet, reduces the difficulty of cleaning and maintenance for users, and improves the user experience.

[0020] Further preferably, the first end of the second flow-guiding structure is arranged close to the rear side wall of the smoke collecting chamber, and the second end of the second flow-guiding structure extends at least to the rear edge of the bottom of the fan system. In the present invention, the second end of the second flow-guiding structure extends to the bottom of the fan system and is located in front of the rear edge, which is conducive to improving the oil smoke diversion effect.

[0021] Furthermore, an opening is provided at the rear edge of the bottom of the fan system for the oil in the fan system to flow into the guide groove. A lot of oil droplets will drip on the impeller and volute in the fan system, and this structure facilitates the output of this part of the oil through the guide groove, thereby reducing the adverse effects of oil accumulation on the fan system and improving the oil fume absorption effect.

[0022] Compared with the prior art, the advantages of the present invention are: the rear wall of the range hood shell of the present invention is installed against the wall, and since the smoke inlet chamber at the lower part of the shell extends vertically, the width of the smoke inlet chamber in the front-to-back direction can be made thinner, and can extend downward to be sufficiently close to the stove and the source of oil fume, so that the oil fume is quickly sucked into the upper row of the smoke inlet chamber as soon as it is generated, thereby improving the oil fume extraction effect; the air inlet chamber structure that gradually narrows along the wind flow direction is also conducive to further improving the range hood effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the flow state structure of oil smoke in the background technology of the present invention;

[0024] Figure 2 for Figure 1 Side view of

[0025] Figure 3 This is a schematic diagram of the structure of a range hood in an embodiment of the present invention;

[0026] Figure 4 for Figure 3 Side view of

[0027] Figure 5 This is a schematic diagram of the back structure after a portion of the housing is hidden in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the smoke inlet chamber in an embodiment of the present invention (part of the housing is hidden);

[0029] Figure 7 This is a schematic structural diagram of the smoke inlet chamber part in an embodiment of the present invention;

[0030] Figure 8 It is a structural schematic diagram of the flow state of oil smoke in a state where the second flow guiding structure is not provided in an embodiment of the present invention;

[0031] Fig. 9 for Figure 5 A schematic diagram of the enlarged structure of part A;

[0032] Fig.10 for Fig. 9 A schematic diagram of the assembly structure of the second guide structure and the smoke collecting chamber;

[0033] Fig.11 A schematic diagram of another second flow guiding structure used in an embodiment of the present invention;

[0034] Fig.12 for Fig.11 A schematic diagram of the enlarged structure of part B;

[0035] Fig.13 It is a schematic diagram of the flow state of oil smoke when the second flow guide structure is set in an embodiment of the present invention;

[0036] Fig.14 for Fig.13 Side view of. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below with reference to the accompanying drawings.

[0038] like Figure 3As shown in Figures 14 to 14, the range hood of this embodiment includes a shell 1 and a fan system 2 arranged in the shell 1. The lower part of the shell 1 has a vertically extending smoke inlet chamber 11, and the front side wall of the lower part of the shell 1 is provided with a smoke inlet port 111 connected to the smoke inlet chamber 11. The upper part of the shell 1 has a smoke collecting chamber 12 connected to the smoke inlet chamber 11, and the smoke collecting chamber 12 extends forward to form an installation chamber 13 for installing the fan system 2. It should be noted that the installation chamber 13 is used to install the fan system 2, but the installation position of the fan system 2 should not be completely limited to the installation chamber 13. Since the smoke collecting chamber 12 and the installation chamber 13 are an integral whole, when installing the fan system 2, part of the fan system 2 can also be located in the smoke collecting chamber 12 according to needs. The air inlet 21 of the fan system 2 is connected to the smoke collecting chamber 12, and the air outlet of the fan system 2 is arranged upward. An oil collecting cup 4 with an upward opening is provided at the lower edge of the housing 1, and the bottom of the smoke inlet chamber 11 is connected to the oil collecting cup 4. Since the smoke inlet chamber 11 at the lower part of the housing 1 extends vertically, the width of the smoke inlet chamber 11 in the front-to-back direction can be made thinner, and can extend downward to be sufficiently close to the stove and the oil fume source, so that the oil fume is quickly sucked into the upper row of the smoke inlet chamber as soon as it is generated, thereby improving the oil fume absorption effect.

[0039] The width of the smoke inlet chamber 11 in the present embodiment decreases gradually from bottom to top in the horizontal direction to form the first flow guide structure 100. The length L3 of the smoke inlet 111 is greater than the inlet length L2 of the smoke collecting chamber 12, and L2:L3=1:(1.2 ~ 3). In the present embodiment, L2=378mm, L3=778mm. By adopting this structure, since the width of the smoke inlet chamber 11 gradually narrows from bottom to top, the overall negative pressure area distribution is more evenly and concentrated. After the oil smoke enters the smoke inlet chamber 11 from the smoke inlet port 111, it gathers along the smoke chamber transitioned by the first guide structure 100 and is sucked into the smoke collecting chamber 12; at the same time, since the upper part of the smoke inlet chamber 11 is directly connected to the inlet of the smoke collecting chamber 12, the flow direction of the oil smoke in the smoke chamber is effectively slowed down. Compared with the obvious change of the vertical structure flue under the same situation, this implementation allows the oil smoke to flow smoothly into the smoke collecting chamber 12, effectively avoiding the formation of partial vortices on both sides of the top of the smoke inlet chamber 11, and reducing the aerodynamic noise generated thereby.

[0040] Specifically, the upper port of the smoke inlet chamber 11 is connected to the lower port of the smoke collecting chamber 12, and the lateral width of the upper port of the smoke inlet chamber 11 matches the lateral width of the lower port of the smoke collecting chamber 12. A better way is to set the upper port of the smoke inlet chamber 11 and the lower port of the smoke collecting chamber 12 after the first flow guide structure 100 is consistent in size, but considering that a certain assembly margin is required during the assembly process, it is not required that the upper port of the smoke inlet chamber 11 and the lower port of the smoke collecting chamber 12 are completely consistent in size, as long as the two can be well connected.

[0041] The smoke inlet chamber 11 is provided with a first inclined plate 113 arranged near the first side wall 112 of the smoke inlet chamber 11 and a second inclined plate 115 arranged near the second side wall 114. The first inclined plate 113 gradually inclines from top to bottom toward the first side wall 112 of the smoke inlet chamber 11, and the second inclined plate 115 gradually inclines from top to bottom toward the second side wall 114 of the smoke inlet chamber 11. The upper edge of the first inclined plate 113 is connected to the lower edge of the first side wall 121 of the smoke collecting chamber 12, and the upper edge of the second inclined plate 115 is connected to the lower edge of the second side wall 122 of the smoke collecting chamber 12. With the above structure, after the oil smoke enters the smoke inlet chamber 11 from the smoke inlet port 111, the oil smoke gathers due to the gradual narrowing of the overall width of the smoke inlet chamber 11. At the same time, since the upper part of the smoke inlet chamber 11 is directly connected to the smoke inlet of the smoke collecting chamber 12, there is no obvious change in the flow direction of the oil smoke in the smoke chamber compared with the rectangular flue under the same conditions, so that the oil smoke can flow into the smoke collecting chamber smoothly and concentratedly, thereby achieving a better oil fume absorption effect; at the same time, the oil droplets accumulated on the first inclined plate 113 and the second inclined plate 115 can slide down the inclined surface, avoiding the problem of direct dripping of the oil droplets; in addition, the smoke inlet chamber structure with a longitudinal cross-section similar to a trapezoid, compared with the traditional vertical flue with equal width at the top and bottom, the reserved left and right spaces can be used for the installation of other functional equipment, such as noise reduction equipment, control components, etc., so that the overall structure of the range hood is more compact.

[0042] In this embodiment, the first sound-absorbing cotton 110 arranged in parallel with the corresponding inclined plates is attached to the outer side walls of the first inclined plate 113 and the second inclined plate 115. Correspondingly, a plurality of silencer holes 116 arranged at intervals are respectively opened on the first inclined plate 113 and the second inclined plate 115. A second sound-absorbing cotton 117 is arranged on the front side wall of the smoke inlet chamber 11. Since the air duct of the smoke inlet chamber 11 of this embodiment gradually narrows from bottom to top, it can be seen from the Venturi effect that the wind speed in the air duct of the smoke inlet chamber 11 will gradually increase along the wind flow direction, resulting in relatively higher noise. The first sound-absorbing cotton 110 close to the corresponding inclined plates is placed on both sides of the air duct, and the second sound-absorbing cotton 117 close to the smoke inlet chamber 11 is placed on the front side of the air duct, which not only makes reasonable use of the space here, but also has a good noise reduction effect.

[0043] The fan system 2 of this embodiment is a double air inlet fan system, the rear side of the fan system 2 has a main air inlet 21 arranged toward the smoke collecting chamber 12, and the front side of the fan system 2 has a secondary air inlet 22 located in the installation chamber 13. The smoke collecting chamber 12 is provided with a second guide structure 3 that gradually tilts downward from front to back on the inner side wall near the entrance. Although the setting of the first guide structure 100 avoids the generation of top vortex in the smoke inlet chamber 11, there is still a sudden change in the flow channel structure when the oil smoke flows into the junction of the smoke inlet chamber 11 and the smoke collecting chamber 12, and the entrance of the smoke collecting chamber 12 will still form a vortex near the side wall, and the oil smoke flow rate after being guided by the first guide structure 100 gradually increases, and it is concentrated at the entrance of the smoke collecting chamber 12. Compared with the case where the first guide structure 100 is not provided, it even aggravates the degree of oil smoke collision at the entrance of the smoke collecting chamber 12, which causes the motor speed to have a reciprocating fluctuation of ±20 revolutions, and thus generates a large noise. Moreover, for the double-inlet fan system, the main air inlet 21 of the fan system 2 is close to the oil fume suction channel, and the secondary air inlet 22 is far from the oil fume suction channel. In the actual oil fume suction process, a large amount of oil fume is sucked in by the main air inlet 21. Since a vortex is formed at the side wall of the smoke collecting chamber 12 near the entrance, the flow of oil fume to the secondary air inlet 22 is affected, which not only reduces the oil fume suction efficiency, but also increases the load of the main air inlet 21, thereby aggravating the negative impact of the vortex at the entrance of the smoke collecting chamber 12. After the above-mentioned second guide structure 3 is set, the vortex caused by the sudden change of the structure at the junction of the smoke inlet chamber 11 and the smoke collecting chamber 12 is eliminated, thereby avoiding the influence of the vortex on the fluctuation of the main air intake, thereby stabilizing the motor speed and eliminating the aerodynamic noise generated thereby; at the same time, the second guide structure 3 forms a guide channel between the smoke collecting chamber 12 and the installation chamber 13, and guides the vortex at the bottom of the original volute into the secondary air inlet 22, thereby realizing diversion and balancing the oil smoke flow distribution of the primary and secondary air inlets, effectively improving the oil smoke suction efficiency of the fan system 2, and further avoiding the formation of aerodynamic noise at the bottom of the volute.

[0044] In the present embodiment, the angle between the second flow-guiding structure 3 and the horizontal plane is α, 9°≤α≤60°. A second flow-guiding structure 3 is respectively arranged on the two inner side walls of the smoke collecting chamber 12, and the spacing between the inner edges of the two second flow-guiding structures 3 is L1, and the width at the entrance of the smoke collecting chamber 12 is L2, 40mm≥L2-L1≥120mm. The above design is conducive to improving the oil smoke diversion effect, and the effect is better when α=30° and L2-L1=60mm. The second flow-guiding structure 3 has a positioning piece 31 arranged close to the inner wall surface of the smoke collecting chamber 12 and a first bevel 32 extending gradually from the upper edge or lower edge of the positioning piece 31 to the inner side of the smoke collecting chamber 12, and the acute angle β formed between the first bevel 32 and the positioning piece 31 is 45°~90°. The inner edge of the first bevel 32 gradually extends upward to form a second bevel 33, and the acute angle δ between the second bevel 33 and the positioning piece 31 is 0-30°. This structure is conducive to improving the oil smoke diversion effect. Fig. 9 , 12 Two different second flow guiding structures 3 are shown respectively.

[0045] A guide groove 30 is formed between the first bevel 32, the second bevel 33 and the inner side wall of the smoke collecting chamber 12, which can guide the oil dripping from the inner side wall of the smoke collecting chamber 12 and the installation chamber 13 into the rear side of the smoke chamber 11. The guide groove 30 can effectively increase the flow of oil and prevent the oil from agglomerating, and has a good oil guiding effect. At the same time, the oil originally dripping into the front side of the cavity is introduced to the rear part, which effectively reduces the oil dripping in the front part of the air inlet, reduces the difficulty of cleaning and maintenance for users, and improves the user experience. The first end of the second guide structure 3 is arranged near the rear side wall of the smoke collecting chamber 12, and the second end of the second guide structure 3 extends at least to the rear edge of the bottom of the fan system 2. In this embodiment, the second end of the second guide structure 3 extends to the bottom of the fan system 2 and is located in front of the rear edge. This structure is conducive to improving the oil fume diversion effect. An opening 20 for the oil in the fan system 2 to flow into the guide groove 30 is provided at the rear edge of the bottom of the fan system 2. A lot of oil droplets will drip on the impeller and volute in the fan system 2. This structure facilitates the output of this part of oil through the guide groove 30, thereby reducing the adverse effects of oil accumulation on the fan system and improving the oil fume absorption effect.

Claims

1. A range hood, comprising a housing (1) and a fan system (2) arranged in the housing (1), characterized in that: The lower part of the shell (1) has a vertically extending smoke inlet chamber (11), the front side wall of the lower part of the shell (1) is provided with a smoke inlet port (111) connected to the smoke inlet chamber (11), the upper part of the shell (1) has a smoke collecting chamber (12) connected to the smoke inlet chamber (11), the smoke collecting chamber (12) extends forward to form an installation chamber (13) for installing a fan system (2), and the air inlet port (21) of the fan system (2) is connected to the smoke collecting chamber (12); The fan system (2) is a double air inlet fan system, the rear side of the fan system (2) has a main air inlet (21) arranged toward the smoke collecting chamber (12), and the front side of the fan system (2) has a secondary air inlet (22) located in the installation chamber (13); the smoke collecting chamber (12) is provided with a second guide structure (3) on the inner side wall near the entrance, which gradually tilts downward from front to back, and the second guide structure (3) is used to break up the vortex caused by the sudden change of structure at the junction of the smoke inlet chamber (11) and the smoke collecting chamber (12); the second guide structure (3) forms a guide channel between the smoke collecting chamber (12) and the installation chamber (13) that can guide the vortex at the bottom of the fan system (2) to the secondary air inlet (22), thereby realizing diversion to balance the oil smoke flow distribution of the main and secondary air inlets.

2. The range hood according to claim 1, characterized in that: The width of at least the upper portion of the smoke inlet chamber (11) in the horizontal direction gradually decreases from bottom to top, thereby forming a first flow guide structure (100).

3. The range hood according to claim 2, characterized in that: The upper port of the smoke inlet chamber (11) is connected to the lower port of the smoke collecting chamber (12), and the lateral width of the upper port of the smoke inlet chamber (11) matches the lateral width of the lower port of the smoke collecting chamber (12).

4. The range hood according to claim 3, characterized in that: The smoke inlet chamber (11) is provided with a first inclined plate (113) arranged close to a first side wall (112) of the smoke inlet chamber (11) and a second inclined plate (115) arranged close to a second side wall (114), wherein the first inclined plate (113) is gradually inclined from top to bottom toward the first side wall (112) of the smoke inlet chamber (11), and the second inclined plate (115) is gradually inclined from top to bottom toward the second side wall (114) of the smoke inlet chamber (11).

5. The range hood according to claim 3, characterized in that: The length L3 of the smoke inlet (111) is greater than the inlet length L2 of the smoke collecting chamber (12), and L2:L3=1:(1.2 ~ 3).

6. The range hood according to claim 5, characterized in that: The L2=360~400mm, the L3=750~800mm.

7. The range hood according to claim 4, characterized in that: A first sound-absorbing cotton (110) is arranged on the side wall of the first inclined plate (113) and / or the second inclined plate (115) located outside the smoke inlet chamber (11), and correspondingly, a plurality of silencer holes (116) arranged at intervals are opened on the first inclined plate (113) and / or the second inclined plate (115).

8. The range hood according to any one of claims 1 to 7, characterized in that: A second sound-absorbing cotton (117) is arranged on the front side wall of the smoke inlet chamber (11).

9. The range hood according to any one of claims 1 to 7, characterized in that: The included angle between the second flow guiding structure (3) and the horizontal plane is α, 9°≤α≤60°.

10. The range hood according to any one of claims 1 to 7, characterized in that: The second flow guiding structures (3) are respectively arranged on the two inner side walls of the smoke collecting chamber (12), and the distance between the inner edges of the two second flow guiding structures (3) is L1. The width of the smoke collecting chamber (12) at the entrance is L2, and 40 mm ≥ L2-L1 ≥ 120 mm.

11. The range hood according to any one of claims 1 to 7, characterized in that: The second flow-guiding structure (3) comprises a positioning piece (31) arranged close to the inner wall surface of the smoke collecting chamber (12) and a first oblique edge (32) gradually extending from the upper edge or the lower edge of the positioning piece (31) toward the inner side of the smoke collecting chamber (12), wherein the acute angle β formed between the first oblique edge (32) and the positioning piece (31) is between 45° and 90°.

12. The range hood according to claim 11, characterized in that: The inner edge of the first bevel (32) gradually extends upwardly to form a second bevel (33), and the acute angle δ formed between the second bevel (33) and the positioning piece (31) is 0-30°.

13. The range hood according to claim 12, characterized in that: A guide groove (30) is formed between the first bevel (32), the second bevel (33) and the inner wall of the smoke collecting chamber (12) and is capable of guiding oil dripping from the inner wall of the smoke collecting chamber (12) and / or the installation chamber (13) into the rear side of the smoke chamber (11).

14. The range hood according to claim 13, characterized in that: The first end of the second flow guiding structure (3) is arranged close to the rear side wall of the smoke collecting chamber (12), and the second end of the second flow guiding structure (3) extends at least to the rear side edge of the bottom of the fan system (2).

15. The range hood according to claim 14, characterized in that: An opening (20) is provided at the rear edge of the bottom of the fan system (2) for allowing oil in the fan system (2) to flow into the guide groove (30).

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