A range hood

Abstract

The present invention discloses a range hood, comprising an air intake assembly, a fan frame, and a fan system disposed within the fan frame. The air intake assembly includes a first duct and a second duct, both of which are open at both ends. The first duct is disposed on the left side outside the fan frame, and the second duct is disposed on the right side outside the fan frame. The range hood is formed with two oil fume passages: an inner oil fume passage that enters the fan frame through the lower end of the fan frame, and an outer oil fume passage that enters the fan frame from the outside of the fan frame along the lower end of each duct. Compared with the prior art, the present invention has the advantage that, by providing independent oil fume passages outside the fan frame of the range hood, the oil fume path does not need to be forcibly changed, and the oil fume can be drawn into the range hood from the outside along the outwardly diffusing path. After entering the range hood, the fluid flows independently in its respective air ducts, reducing the occurrence of turbulence. Reducing turbulence can effectively reduce flow loss and aerodynamic noise in the air volume.

Description

Technical Field

[0001] The invention relates to an oil fume purification device, in particular to a range hood. Background Art

[0002] Chinese cooking produces a lot of oil smoke. In order to keep the kitchen environment clean and human health, range hoods have become one of the indispensable appliances in modern home kitchens.

[0003] A typical ceiling-mounted range hood features a fan frame housing a fan, a fume hood below the frame, and an air inlet at the center of the hood, directly connected to the high-negative-pressure zone where the fan frame resides. This type of range hood only draws smoke from the inside of the hood. The air inlet near the fan frame experiences high wind speeds and high negative pressure, while the negative pressure attenuates significantly farther from the fan frame. Cooking stove burners are typically located to the left and right of the hood, and oil smoke diffuses as it rises. This results in poor extraction efficiency and frequent oil smoke escape.

[0004] Existing range hoods, such as the prior Chinese patent of the present applicant with application number 202123085066.X, disclose a dual-inlet range hood, including a smoke hood; a fan box; a fan, a left air inlet hole is provided on the left cover plate of the volute, and a right air inlet hole is provided on the right cover plate of the volute; an oil screen assembly, the oil screen assembly includes a plate body located in the middle of the air inlet and two oil screens connected to the left and right sides of the plate body; a partition, vertically arranged in the smoke hood, the top of the partition is connected to the volute, and the lower end of the partition is arranged adjacent to the plate body, the partition plate divides the smoke hood into a left air inlet channel and a right air inlet channel that are independent of each other, the left air inlet channel is fluidically connected to the left air inlet hole, and the right air inlet channel is fluidically connected to the right air inlet hole, and the fan box is also divided into independent left and right double chambers by the fan.

[0005] For this type of range hood, since the oil smoke from a single stove diffuses both inward and outward, the fan is located in the middle. The inward suction force is much greater than the outward suction force, and the oil smoke inward is easily sucked away, but not necessarily outward. A lot of suction is needed to make it change direction and flow toward the middle. The oil smoke that diffuses outward needs to turn 180 degrees at the smoke inlet before it can be sucked away, which requires a large amount of air.

[0006] In addition, common household stoves usually have two burners, one on the left and one on the right. During cooking, users sometimes use only one burner, and sometimes use both burners at the same time. However, stir-frying, which can generate a lot of oil smoke in home cooking, is often only done on one side. If the user actually uses only the left burner for cooking, or uses the left burner for cooking and the right burner for steaming rice, then for the range hood, the oil smoke concentration and oil smoke particles on the left side will inevitably be much greater than those on the right side. Therefore, oil smoke often escapes during stir-frying. A common solution is to increase the impeller speed to increase the total air volume of the range hood. The increase in total air volume will lead to a simultaneous increase in the air volume on both the left and right sides, thereby improving the oil smoke extraction effect. Obviously, the increase in impeller speed will lead to a significant increase in noise, which affects people's health. In addition, the actual stir-frying occurs on one side, and increasing the air volume on both sides at the same time will result in energy waste on the other side. Summary of the Invention

[0007] The first technical problem to be solved by the present invention is to provide a range hood to address the deficiencies of the above-mentioned existing technologies. The range hood does not need to forcibly change the oil smoke path. The oil smoke can be sucked into the range hood from the outside along the outward-diffused oil smoke path, preventing the oil smoke from escaping on both sides.

[0008] The second technical problem to be solved by the present invention is to provide a range hood to address the deficiencies in the above-mentioned prior art, which can significantly improve the oil fume extraction effect on the same side of the range hood when stir-frying on one side without increasing the total air volume.

[0009] The present invention solves the first technical problem by adopting a technical solution: a range hood comprising an air inlet assembly, a fan frame, and a fan system disposed in the fan frame, characterized in that: the air inlet assembly comprises a first duct and a second duct, both of which are open at both ends, the first duct being disposed on the left side outside the fan frame, and the second duct being disposed on the right side outside the fan frame;

[0010] The range hood is formed with two oil fume passages, namely an inner oil fume passage entering the fan frame through the lower end of the fan frame, and an outer oil fume passage entering the fan frame from the outside of the fan frame along the lower ends of the pipes.

[0011] By having an independent oil fume channel on the outside of the range hood's fan frame, there is no need to forcibly change the oil fume path (that is, a large air volume is not required, the larger the air volume and the higher the speed, the greater the noise). The oil fume can also be sucked into the range hood from the outside along the outward-diffused oil fume path. After entering the range hood, the fluid flows independently in its respective air ducts (the middle one inside and the independent one outside), reducing the occurrence of turbulence (different flow velocities and flow paths are prone to turbulence). Reducing turbulence can effectively reduce the flow loss of air volume and aerodynamic noise.

[0012] According to one aspect of the present invention, the air intake assembly further includes a first fume hood for inhaling oil fumes and a second fume hood for inhaling oil fumes, the first fume hood being connected to the fan rack and the lower end of the first duct respectively and being in fluid communication with each other, and the second fume hood being connected to the fan rack and the lower end of the second duct respectively and being in fluid communication with each other;

[0013] Thus, the channels through which each fume hood enters the fan rack via the lower end of the fan rack constitute the inner fume channel, and the channels through which each fume hood enters the fan rack from the outside of the fan rack via the corresponding pipes constitute the outer fume channel.

[0014] According to another aspect of the present invention, the lower end of the first duct constitutes a first air duct inlet, the lower end of the second duct constitutes a second air duct inlet, a first connecting plate is connected between the right side of the lower end of the first duct and the left side wall of the fan rack, and a second connecting plate is connected between the left side of the lower end of the second duct and the right side wall of the fan rack; the lower end of the fan rack is provided with a first air inlet and a second air inlet spaced apart from each other on the left and right sides;

[0015] Thus, the channels from each air inlet entering the fan rack through the lower end of the fan rack constitute the inner oil fume channel, and the channels from each air duct inlet entering the fan rack from the outside of the fan rack through the corresponding pipes constitute the outer oil fume channel.

[0016] Furthermore, the first pipe has a first baffle extending downward on the left side of the first air duct inlet, and the second pipe has a second baffle extending downward on the right side of the second air duct inlet, so that each baffle can play a buffering role to prevent oil smoke from escaping.

[0017] In order to further improve the oil fume extraction effect, notches are respectively provided on the left side wall of the fan frame near the lower end portion and on the right side wall of the fan frame near the lower end portion, and the above-mentioned two connecting plates are located above the corresponding notches. The range hood also includes a first movable ventilator inserted into the fan frame through the notch on the left side of the fan frame and a second movable ventilator inserted into the fan frame through the notch on the right side of the fan frame. A first auxiliary air inlet is provided on the left side wall of the first movable ventilator and a first outlet is provided on the left side of the top surface for discharging the airflow entering the first auxiliary air inlet. A second auxiliary air inlet is provided on the right side wall of the second movable ventilator and a second outlet is provided on the right side of the top surface for discharging the airflow entering the second auxiliary air inlet. The airflow discharged from the first outlet and the second outlet can be sucked in by the fan system.

[0018] Furthermore, the first pipe is provided with a first baffle extending downwardly on the left side of the first air duct inlet, and the second pipe is provided with a second baffle extending downwardly on the right side of the second air duct inlet;

[0019] The first movable ventilator and the second movable ventilator are both capable of extending and retracting in the left-right direction, and the two movable ventilators are in fluid communication;

[0020] When the first movable ventilator is extended to its longest position, the first movable ventilator portion is located on the left side outside the fan frame, the first auxiliary air inlet is closed by the first baffle, and the first outlet corresponds to the inlet of the first air duct; when the second movable ventilator is extended to its longest position, the second movable ventilator portion is located on the right side outside the fan frame, the second auxiliary air inlet is closed by the second baffle, and the second outlet corresponds to the inlet of the second air duct;

[0021] When the first movable ventilator is retracted to its shortest, the first movable ventilator is immersed in the wind rack, and the first auxiliary air inlet is flush with the left side wall of the wind rack; when the second telescopic arm of the second movable ventilator is retracted to its shortest, the second movable ventilator is immersed in the wind rack, and the second auxiliary air inlet is flush with the right side wall of the wind rack.

[0022] In this way, the oil smoke can be decelerated, and each auxiliary air inlet can be connected to the pipe on the other side to enhance the deceleration effect.

[0023] Furthermore, the first movable ventilator includes a first telescopic arm that can be extended and retracted in the left and right directions, and the second movable ventilator includes a second telescopic arm that can be extended and retracted in the left and right directions. The first telescopic arm is open toward one end of the second telescopic arm, and the second telescopic arm is open toward one end of the first telescopic arm, thereby realizing the extension and retraction of each movable ventilator by the extension and retraction of the telescopic arm.

[0024] Furthermore, the first movable ventilator and the second movable ventilator are both U-shaped, and the U-shaped opening of each movable ventilator faces the other movable ventilator. The first telescopic arm and the second telescopic arm each have two arranged in a front-to-back interval, and the first auxiliary air inlet and the first outlet are located between the corresponding ends of the two first telescopic arms, and the second auxiliary air inlet and the second outlet are located between the corresponding ends of the two second telescopic arms, thereby allowing the air inlet and outlet to have a larger area without blocking the air inlet of the two air inlets at the lower end of the wind rack.

[0025] Furthermore, a bottom plate is provided on the inner side of the fan frame above the two movable ventilators. The bottom plate is provided with a first vent capable of connecting the first outlet to the fluid of the fan system, and a second vent capable of connecting the second outlet to the fluid of the fan system. The position of the first vent corresponds to the first telescopic arm, and the depth of the first vent in the front-to-back direction is no greater than the depth of the corresponding first telescopic arm. The position of the second vent corresponds to the second telescopic arm, and the depth of the second vent in the front-to-back direction is no greater than the depth of the corresponding second telescopic arm. Thus, when the two movable ventilators are in the shortened state, the exhausted airflow can be inhaled by the fan system.

[0026] Preferably, the fan system is a double-inlet fan and the axis extends in the left-right direction, thereby better adapting the two pipelines.

[0027] Furthermore, one end of the first pipe is connected to the left side wall of the fan rack and is in fluid communication with the inner side of the fan rack, the fan rack is provided with a first opening at the connection with the first pipe, and one end of the second pipe is connected to the right side wall of the fan rack and is in fluid communication with the inner side of the fan rack, and the fan rack is provided with a second opening at the connection with the second pipe; the fan system includes a first inlet facing left and a second inlet facing right, the first opening is opposite to the first inlet, and the second opening is opposite to the second inlet, thereby better matching the two pipes to achieve direct suction.

[0028] The present invention solves the second technical problem by adopting a technical solution: a partition is provided at the lower end of the fan system. The partition is rotatable about an axis extending forward and backward. The partition's length allows it to abut against the bottom surface, left side wall, or right side wall of the fan rack during rotation, thereby sealing the fluid communication path at the corresponding location. By flipping the partition, flow distribution is achieved between the left and right sides.

[0029] Compared with the prior art, the advantages of the present invention are: by providing an independent oil fume channel on the outside of the fan frame of the range hood, there is no need to forcibly change the oil fume path (that is, a large air volume is not required, the larger the air volume and the higher the speed, the greater the noise), and the oil fume can also be sucked into the range hood from the outside along the outward-diffused oil fume path, and the fluid after entering the range hood flows independently in their respective air ducts (inside through the middle, outside through independent air ducts), reducing the occurrence of turbulence (different flow velocities and different flow paths are prone to turbulence), and reducing turbulence can effectively reduce flow loss and aerodynamic noise of air volume; by setting a flippable partition, there is no need to increase the total air volume (that is, the impeller speed remains unchanged, no noise is increased, and no energy consumption is increased), so as to solve the problem of stir-frying on one side, and the corresponding side of the range hood on the same side can greatly improve the oil fume extraction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of a range hood according to a first embodiment of the present invention;

[0031] Figure 2 It is a cross-sectional front view of the range hood according to the first embodiment of the present invention (the partition is in the middle);

[0032] Figure 3 is a cross-sectional view of a range hood according to a first embodiment of the present invention;

[0033] Figure 4 It is a cross-sectional front view of the range hood according to the first embodiment of the present invention (the partition is on the right);

[0034] Figure 5 is a schematic diagram of a range hood according to a second embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the exploded structure of a range hood according to a second embodiment of the present invention (cross-section view of the fan frame and duct);

[0036] Figure 7 is a front cross-sectional view of a range hood according to a second embodiment of the present invention;

[0037] Figure 8 is a cross-sectional view of a range hood according to a second embodiment of the present invention;

[0038] Figure 9 It is a cross-sectional front view of a range hood according to a second embodiment of the present invention (with the first movable ventilator extended);

[0039] Figure 10 is a cross-sectional view of a range hood according to a second embodiment of the present invention (with the first movable ventilator extended);

[0040] Figure 11 2 is a cross-sectional view of a range hood according to a second embodiment of the present invention (with the first movable ventilator extended). DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0043] Example 1

[0044] See also Figures 1 to 3A range hood includes an air intake assembly and a fan frame 2. The air intake assembly includes a first air intake structure 11 and a second air intake structure 12 arranged at intervals on the left and right. The first air intake structure 11 includes a first smoke collection hood 111 and a first pipe 112. The second air intake structure 12 includes a second smoke collection hood 121 and a second pipe 122.

[0045] A first air inlet 113 is provided on the first smoke hood 111, such as on the bottom surface of the first smoke hood 111. A second air inlet 123 is provided on the second smoke hood 121, such as on the bottom surface of the second smoke hood 121. The first smoke hood 111 partially extends from the lower left end portion of the wind rack 2 into the wind rack 2 and is in fluid communication with the inner side of the wind rack 2. The second smoke hood 121 partially extends from the lower right end portion of the wind rack 2 into the wind rack 2 and is in fluid communication with the inner side of the wind rack 2. Each smoke hood may not extend into the interior of the wind rack 2, but must ensure that it is in fluid communication with the inner side of the wind rack 2 at or near the lower end portion of the wind rack 2.

[0046] One end of the first duct 112 is connected to the first fume hood 111 and is in fluid communication with the interior of the first fume hood 111. The other end of the first duct 112 is connected to the left side wall of the fan rack 2 and is in fluid communication with the interior of the fan rack 2. The fan rack 2 has a first opening 21 defined at the connection with the first duct 112. One end of the second duct 122 is connected to the second fume hood 121 and is in fluid communication with the interior of the second fume hood 121. The other end of the second duct 122 is connected to the right side wall of the fan rack 2 and is in fluid communication with the interior of the fan rack 2. The fan rack 2 has a second opening 22 defined at the connection with the second duct 122. Preferably, both the first duct 112 and the second duct 122 are in an inverted L-shape.

[0047] A fan system 3 is provided in the fan rack 2. The fan system 3 is a double-inlet fan, whose axis extends in the left and right directions, including a first inlet 31 and a second inlet 32. The first inlet 31 faces left, and the second inlet 32 faces right. The first opening 21 is opposite to the first inlet 31, and the second opening 22 is opposite to the second inlet 32.

[0048] Thus, the range hood forms two oil fume passages: an inner oil fume passage that enters the fan frame 2 from each air inlet through the lower end of the fan frame 2, and an outer oil fume passage that enters the fan frame 2 from each air inlet through corresponding ducts from the left and right sides of the outside of the fan frame 2. Preferably, the first fume hood 111 and the second fume hood 121 are symmetrically arranged, and the first duct 112 and the second duct 122 are symmetrically arranged.

[0049] A partition 4 is provided at the lower end of the fan system 3. The partition 4 is rotatable about an axis extending forward and backward. Rotation of the partition 4 can be driven by a motor 5, or a drive mechanism can be employed. The front and rear sides of the partition 4 extend to the front and rear sides of the fan rack 2. Preferably, the center of rotation of the partition 4 is located in the middle of the fan rack 2 in the left-right direction. The length of the partition 4 allows it to abut against the bottom surface, left side wall, or right side wall of the fan rack 2 during rotation, thereby sealing the fluid communication path at the corresponding location.

[0050] like Figure 2 and Figure 3 As shown, at this time, the partition 4 is in a vertical downward state, dividing the fan frame 2 into two parts, the left and right parts. The arrows in the figure indicate the flow path of the oil smoke. The flow of the first air inlet 111 comes from the first inlet 31 of the fan system 3, and the flow of the second air inlet 121 comes from the second inlet 32 of the fan system 3.

[0051] like Figure 4 As shown, driven by the motor 5, the partition 4 flips to the right side and abuts the right side wall of the fan rack 2. This isolates the outlet of the second fume hood 121 into the fan rack 2 from the outlet (second opening 22) of the second duct 122 into the fan rack 2. The arrow in the figure indicates the fume flow path. At this time, the flow of the first fume hood 111 comes from the first inlet 31 of the fan system 3. At the same time, the flow of the second fume hood 121 into the fan rack 2 also comes from the first inlet 31 of the fan system 3, while the flow of the second duct 122 into the fan rack 2 comes only from the second inlet 32 of the fan system 3. The same principle applies when the partition 4 rotates to the left.

[0052] If stir-frying is done on the right side of the cooktop and rice is steamed on the left, the range hood will produce more oil smoke on the right side than on the left. The motor 5 is activated by the on / off button, causing the partition 4 to flip to the right. The flow from the second fume hood 121 to the fan frame 2 also originates from the first inlet 31 of the fan system 3, while the flow from the second duct 122 to the fan frame 2 originates solely from the second inlet 32 of the fan system 3. This increases the air volume from the first air inlet 113, enhancing the right side's smoke extraction effect. The opposite is true for stir-frying on the left side.

[0053] In this embodiment, the structure provides independent oil fume passages (first duct 112 and second duct 122) outside the range hood's fan frame 2. This eliminates the need for forced fume rerouting (in other words, requiring high air volume, as higher air volume and higher speed also increase noise). Oil fume can be drawn into the range hood from the outside, following the outward-diffusion path. After entering the range hood, the fluid flows independently through its respective air ducts (internal through the central duct and external through the independent ducts), minimizing turbulence (which is more prone to occur with different flow velocities and flow paths). This reduction in turbulence effectively reduces airflow losses and aerodynamic noise.

[0054] Example 2

[0055] See also Figure 5 and Figure 6 This embodiment differs from the first embodiment described above in that the first and second fume hoods 111 and 121 are no longer provided. Instead, the lower ends of the first and second ducts 112 and 122 are directly open, forming the first and second air duct inlets 1121 and 1221, respectively. A first baffle 1122 extends downwardly from the left side of the first air duct inlet 1121, while a second baffle 1222 extends downwardly from the right side of the second air duct inlet 1221. These two baffles act as buffers, preventing oil smoke from escaping. A first connecting plate 24 is connected between the right side of the lower end of the first duct 112 and the left side wall of the fan rack 2, while a second connecting plate 25 is connected between the left side of the lower end of the second duct 122 and the right side wall of the fan rack 2. The first and second air inlets 113 and 123 are spaced apart at the lower end of the fan rack 2.

[0056] The left and right walls of the fan frame 2, near their lower ends, each have notches (not shown in the accompanying drawings), with the two connecting plates positioned above the notches. The range hood also includes a first movable ventilator 61 inserted into the fan frame 2 through the notch on the left side of the fan frame 2, and a second movable ventilator 62 inserted into the fan frame 2 through the notch on the right side of the fan frame 2. Both the first and second movable ventilators 61, 62 are hollow and U-shaped, with the U-shaped opening of each ventilator facing the other. The first movable ventilator 61 has a first auxiliary air inlet 611 on its left side, and a first outlet 612 on its top left side. The second movable ventilator 62 has a second auxiliary air inlet 621 on its right side, and a second outlet 622 on its top right side.

[0057] The first movable ventilator 61 and the second movable ventilator 62 are both retractable structures. The first movable ventilator 61 includes two first telescopic arms 613 spaced apart from each other in a front-to-back arrangement. The first auxiliary air inlet 611 and the first outlet 612 are located between the corresponding ends of the two first telescopic arms 613, thereby forming a U-shape. The second movable ventilator 62 includes two second telescopic arms 623 spaced apart from each other in a front-to-back arrangement. The second auxiliary air inlet 621 and the second outlet 622 are located between the corresponding ends of the two second telescopic arms 623, thereby forming a U-shape. Each telescopic arm can be extended and retracted in the left and right directions.

[0058] When the first telescopic arm 613 of the first movable ventilator 61 is extended to its longest position, the first movable ventilator 61 is partially located on the left side outside the fan rack 2. At this time, the first auxiliary air inlet 611 is blocked by the first baffle 1122, and the first air outlet 612 corresponds to the first air duct inlet 1121. When the second telescopic arm 623 of the second movable ventilator 62 is extended to its longest position, the second movable ventilator 62 is partially located on the right side outside the fan rack 2. At this time, the second auxiliary air inlet 621 is blocked by the second baffle 1222, and the second air outlet 622 corresponds to the second air duct inlet 1221. When the first telescopic arm 613 of the first movable ventilator 61 is retracted to its shortest position (initial state), the first movable ventilator 61 is just immersed in the fan rack 2, and the first auxiliary air inlet 611 is flush with the left side wall of the fan rack 2. When the second telescopic arm 623 of the second movable ventilator 62 is retracted to its shortest position (initial state), the second movable ventilator 62 is just immersed in the fan rack 2, and the second auxiliary air inlet 621 is flush with the right side wall of the fan rack 2.

[0059] Each first telescopic arm 613 is open at one end toward the second telescopic arm 623 , and each second telescopic arm 623 is open at one end toward the first telescopic arm 613 , thereby enabling fluid communication between the two active ventilators.

[0060] Inside the fan frame 2, above the two movable ventilators, is a base plate 23 (in this embodiment, the upper surface of the base plate 23 is considered the bottom surface of the fan frame 2). The base plate 23 defines a first vent 231 corresponding to the first outlet 612 and a second vent 232 corresponding to the second outlet 622. There are two first vents 231, one located corresponding to the two first telescopic arms 613. Each first vent 231 corresponds to a first telescopic arm 613, and the depth of each first vent 231 in the front-to-back direction is no greater than the depth of the corresponding first telescopic arm 613. There are also two second vents 232, one located corresponding to the two second telescopic arms 623. Each second vent 232 corresponds to a second telescopic arm 623, and the depth of each second vent 232 in the front-to-back direction is no greater than the depth of the corresponding second telescopic arm 624. Fumes entering from the first air inlet 113 and the second air inlet 123 can pass upward through the base plate 23 (openings in the base plate 23) and reach the fan system 3.

[0061] When both movable ventilators are retracted to their shortest position, it is the initial state. At this time, the two movable ventilators are in a symmetrical state. When cooking, the air volume on the left and right sides is equal. Figure 7 and Figure 8During the rising process, the oil smoke is sucked into the first air inlet 113 and the second air inlet 123, and part of the oil smoke spreads and escapes to both sides. At this time, the oil smoke comes under the left and right connecting plates and continues to escape outward. At this time, since the first auxiliary air inlet 611 and the second auxiliary air inlet 621 are respectively connected to the inner side of the fan frame 2 through the two ventilation holes on the bottom plate 23, there is a horizontal inward suction force on the two auxiliary air inlets. The direction of the suction force is exactly opposite to the direction of the oil smoke escaping outward, so the suction force can reduce the speed of the oil smoke escaping outward. At this time, the low-speed oil smoke continues to escape outward and is sucked in at the first air duct inlet 1121 and the second air duct inlet 1221.

[0062] Assuming that when frying on the right side and steaming on the left side, the amount of oil smoke generated by frying on the right side is large and the diffusion and escape speed is fast, the air volume of the second auxiliary air inlet 621 can be increased by adjusting each movable ventilator to quickly reduce the speed of oil smoke escaping on the right side, thereby improving the smoking effect on the right side. Figures 9 to 11 The arrow in the figure indicates the oil smoke path. When the first telescopic arm 613 of the first movable ventilator 61 is extended to its maximum length, the first auxiliary air inlet 611 is now closed by the first baffle 1122, and the first vent 231 on the bottom plate 23 is also closed by the first telescopic arm 613. Since the two U-shaped movable ventilators are fluidically connected, the second auxiliary air inlet 621 is now the sole inlet to the first duct 112. The air volume of the second auxiliary air inlet 621 now comes partially from the second inlet 32 of the fan system 3, and the remaining portion comes from the first inlet 31 of the fan system 3 through the first duct 112 and the two movable ventilators. This increases the air volume of the second auxiliary air inlet 621, thereby improving the smoking effect.

[0063] In this embodiment, a partition 4 as shown in the first embodiment may also be provided, and the flow rate can be further distributed by turning the partition 4 to improve the smoking effect.

[0064] Alternatively, the base plate 23 may be devoid of vents. If the base plate 23 lacks vents, when the movable ventilator is shortened, there is no inward jet of fluid, and the fumes are drawn away by the two air duct inlets as they diffuse and escape. When the amount of fumes is high, the first telescopic arm 613 of the first movable ventilator 61 can be extended. This allows the second auxiliary air inlet 621 on the right side to connect with the first duct 112, generating an inward jet of air, thereby reducing the evaporation velocity of the fumes and improving the suction efficiency of the second duct 122.

[0065] In summary, by setting up auxiliary air inlets, the oil smoke can be decelerated, and each auxiliary air inlet can be connected to the pipe on the other side to improve the deceleration effect.

[0066] The "fluid communication" referred to in the present invention refers to the spatial position relationship between two components or parts (hereinafter collectively referred to as the first part and the second part), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A range hood comprising an air inlet assembly, a fan frame (2), and a fan system (3) disposed within the fan frame (2), characterized in that: The air inlet assembly comprises a first pipe (112) and a second pipe (122), both of which are open at both ends; the first pipe (112) is arranged on the left side outside the wind frame (2); and the second pipe (122) is arranged on the right side outside the wind frame (2); The range hood is formed with two oil fume passages, namely an inner oil fume passage that enters the fan frame (2) through the lower end of the fan frame (2), and an outer oil fume passage that enters the fan frame (2) from the outside of the fan frame (2) along the lower end of each pipe; The air intake assembly further comprises a first smoke collecting hood (111) for oil smoke inhalation and a second smoke collecting hood (121) for oil smoke inhalation, wherein the first smoke collecting hood (111) is respectively connected to the fan frame (2) and the lower end of the first pipe (112) and is in fluid communication, and the second smoke collecting hood (121) is respectively connected to the fan frame (2) and the lower end of the second pipe (122) and is in fluid communication; Thus, the passages from each fume hood entering the fan frame (2) via the lower end portion of the fan frame (2) constitute the internal oil fume passage, and the passages from each fume hood entering the fan frame (2) from the outside of the fan frame (2) via the corresponding ducts constitute the external oil fume passage.

2. The range hood according to claim 1, characterized in that: The fan system (3) is a double-inlet fan and its axis extends in the left-right direction.

3. The range hood according to claim 2, characterized in that: One end of the first pipe (112) is connected to the left side wall of the fan rack (2) and is in fluid communication with the inner side of the fan rack (2); the fan rack (2) is provided with a first opening (21) at the connection with the first pipe (112); one end of the second pipe (122) is connected to the right side wall of the fan rack (2) and is in fluid communication with the inner side of the fan rack (2); the fan rack (2) is provided with a second opening (22) at the connection with the second pipe (122); the fan system (3) includes a first inlet (31) facing left and a second inlet (32) facing right, the first opening (21) is opposite to the first inlet (31), and the second opening (22) is opposite to the second inlet (32).

4. The range hood according to claim 2, characterized in that: A partition (4) is provided at the lower end of the fan system (3), and the partition (4) can rotate around an axis extending forward and backward. The length of the partition (4) is such that, during the rotation process, it can abut against the bottom surface of the fan frame (2), the left side wall of the fan frame (2), or the right side wall of the fan frame (2) to close the fluid communication passage at the corresponding position.

5. A range hood comprising an air inlet assembly, a fan frame (2), and a fan system (3) arranged in the fan frame (2), characterized in that: The air inlet assembly comprises a first pipe (112) and a second pipe (122), both of which are open at both ends; the first pipe (112) is arranged on the left side outside the wind frame (2); and the second pipe (122) is arranged on the right side outside the wind frame (2); The range hood is formed with two oil fume passages, namely an inner oil fume passage that enters the fan frame (2) through the lower end of the fan frame (2), and an outer oil fume passage that enters the fan frame (2) from the outside of the fan frame (2) along the lower end of each pipe; The lower end of the first pipe (112) constitutes a first air duct inlet (1121), the lower end of the second pipe (122) constitutes a second air duct inlet (1221), a first connecting plate (24) is connected between the right side of the lower end of the first pipe (112) and the left side wall of the wind frame (2), and a second connecting plate (25) is connected between the left side of the lower end of the second pipe (122) and the right side wall of the wind frame (2); the lower end of the wind frame (2) is provided with a first air inlet (113) and a second air inlet (123) arranged at intervals on the left and right sides; Thus, the channels from each air inlet entering the fan frame (2) via the lower end portion of the fan frame (2) constitute the internal oil fume channel, and the channels from each air duct inlet entering the fan frame (2) from the outside of the fan frame (2) via the corresponding pipes constitute the external oil fume channel.

6. The range hood according to claim 5, characterized in that: The first pipe (112) is provided with a first baffle (1122) extending downwardly on the left side of the first air duct inlet (1121), and the second pipe (122) is provided with a second baffle (1222) extending downwardly on the right side of the second air duct inlet (1221).

7. The range hood according to claim 5, characterized in that: Notches are respectively provided at positions near the lower end of the left side wall of the fan frame (2) and the lower end of the right side wall of the fan frame (2), and the two connecting plates are located above the corresponding notches. The range hood further comprises a first movable ventilator (61) inserted into the fan frame (2) from the notch on the left side of the fan frame (2) and a second movable ventilator (62) inserted into the fan frame (2) from the notch on the right side of the fan frame (2). A first auxiliary air inlet (611) is provided on the left side wall of the first movable ventilator (61) and a first outlet (612) is provided on the left side of the top surface for discharging the airflow entering through the first auxiliary air inlet (611). A second auxiliary air inlet (621) is provided on the right side wall of the second movable ventilator (62) and a second outlet (622) is provided on the right side of the top surface for discharging the airflow entering through the second auxiliary air inlet (621). The airflow discharged from the first outlet (612) and the second outlet (622) can be sucked into the fan system (3).

8. The range hood according to claim 7, characterized in that: The first pipe (112) is provided with a first baffle (1122) extending downwardly on the left side of the first air duct inlet (1121), and the second pipe (122) is provided with a second baffle (1222) extending downwardly on the right side of the second air duct inlet (1221); The first movable ventilator (61) and the second movable ventilator (62) are both capable of extending and retracting in the left-right direction, and the two movable ventilators are fluidically connected. When the first movable ventilator (61) is extended to its longest length, the first movable ventilator (61) is partially located on the left side outside the fan rack (2), at which time the first auxiliary air inlet (611) is closed by the first baffle (1122), and the first outlet (612) corresponds to the first air duct inlet (1121); when the second movable ventilator (62) is extended to its longest length, the second movable ventilator (62) is partially located on the right side outside the fan rack (2), at which time the second auxiliary air inlet (621) is closed by the second baffle (1222), and the second outlet (622) corresponds to the second air duct inlet (1221); When the first movable ventilator (61) is retracted to its shortest position, the first movable ventilator (61) is immersed in the wind frame (2), and the first auxiliary air inlet (611) is flush with the left side wall of the wind frame (2); when the second telescopic arm (623) of the second movable ventilator (62) is retracted to its shortest position, the second movable ventilator (62) is immersed in the wind frame (2), and the second auxiliary air inlet (621) is flush with the right side wall of the wind frame (2).

9. The range hood according to claim 8, characterized in that: The first movable ventilator (61) includes a first telescopic arm (613) that can be extended and retracted in the left and right directions, and the second movable ventilator (62) includes a second telescopic arm (623) that can be extended and retracted in the left and right directions. The first telescopic arm (613) is open toward one end of the second telescopic arm (623), and the second telescopic arm (623) is open toward one end of the first telescopic arm (613).

10. The range hood according to claim 9, characterized in that: The first movable ventilator (61) and the second movable ventilator (62) are both U-shaped, and the U-shaped opening of each movable ventilator faces the other movable ventilator. The first telescopic arm (613) and the second telescopic arm (623) each have two air inlets arranged in a front-to-rear spacing. The first auxiliary air inlet (611) and the first outlet (612) are located between the corresponding ends of the two first telescopic arms (613), and the second auxiliary air inlet (621) and the second outlet (622) are located between the corresponding ends of the two second telescopic arms (623).

11. The range hood according to claim 8, characterized in that: A bottom plate (23) is provided on the inner side of the fan frame (2) at a position above the two movable ventilators. A first vent (231) capable of connecting the first outlet (612) to the fluid of the fan system (3) and a second vent (232) capable of connecting the second outlet (622) to the fluid of the fan system (3) are provided on the bottom plate (23). The position of the first vent (231) corresponds to the first telescopic arm (613), and the depth of the first vent (231) in the front-to-back direction is not greater than the depth of the corresponding first telescopic arm (613). The position of the second vent (232) corresponds to the second telescopic arm (623), and the depth of the second vent (232) in the front-to-back direction is not greater than the depth of the corresponding second telescopic arm (623).

12. The range hood according to any one of claims 5 to 11, characterized in that: The fan system (3) is a double-inlet fan and its axis extends in the left-right direction.

13. The range hood according to claim 12, wherein: One end of the first pipe (112) is connected to the left side wall of the fan rack (2) and is in fluid communication with the inner side of the fan rack (2); the fan rack (2) is provided with a first opening (21) at the connection with the first pipe (112); one end of the second pipe (122) is connected to the right side wall of the fan rack (2) and is in fluid communication with the inner side of the fan rack (2); the fan rack (2) is provided with a second opening (22) at the connection with the second pipe (122); the fan system (3) includes a first inlet (31) facing left and a second inlet (32) facing right, the first opening (21) is opposite to the first inlet (31), and the second opening (22) is opposite to the second inlet (32).

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