Flow guide structure and range hood

Abstract

The utility model provides a flow guide structure and a range hood, relates to the technical field of kitchen electric equipment, and aims to solve the problem of noise increase caused by large vortex generated by airflow in a main case of the range hood to a certain extent. The flow guide structure provided by the utility model is used for shielding a vortex generation area in a main case of the range hood, and comprises a driving component and a flow guide assembly, the flow guide assembly comprises a flow guide plate, the driving component is connected with one end of the flow guide plate and can drive the flow guide plate to rotate, and the other end of the flow guide plate extends in the direction close to a centrifugal fan of the extractor hood.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen electrical equipment, in particular to a flow guide structure and a range hood. Background Art

[0002] Range hoods are essential appliances in the kitchen, used to promptly exhaust cooking fumes and maintain kitchen cleanliness and air quality. However, the noise generated by range hoods during operation has become a major pain point for users. This noise not only affects the cooking experience but can also cause adverse reactions such as dizziness, irritability, and palpitations. Range hood noise primarily comes from fluid noise in the fan and duct, structural noise from the vibration of the motor and blades, and electromagnetic noise generated by the vibration of the motor's stator and rotor. Flow noise in the duct, primarily caused by turbulent vortices, accounts for a significant proportion. Excellent airflow design can effectively reduce this noise.

[0003] At present, many range hoods have designed a sudden cross-section between the smoke collecting chamber and the main chassis in order to reduce the volume occupied by the smoke collecting chamber. At the same time, it is hoped that a resistant muffler can be constructed in this form. However, the sound source of this type of structure (centrifugal fan) is in the expansion chamber, and the expansion muffler effect cannot be achieved. Instead, a 90° angle is formed at the expansion point, causing a larger vortex in the airflow.

[0004] Therefore, there is an urgent need to provide a guide structure and a range hood to solve the problems existing in the prior art to a certain extent. Utility Model Content

[0005] The purpose of the utility model is to provide a flow guide structure and a range hood, which can solve the problem of large vortexes in the airflow of the range hood main box, which causes increased noise, to a certain extent.

[0006] The utility model provides a guide structure for shielding the vortex generating area in the main case of the range hood, including a driving component and a guide assembly; the guide assembly includes a guide plate, the driving component is connected to one end of the guide plate and can drive the guide plate to rotate, and the other end of the guide plate extends in the direction of the centrifugal fan close to the range hood.

[0007] As an optional solution for the guide structure, the guide assembly also includes a first movable plate and a second movable plate, one end of the first movable plate is rotatably connected to the end of the guide plate away from the driving component, the other end of the first movable plate is nested with the second movable plate, one end of the second movable plate is rotatably connected to the inner wall of the main chassis, and the first movable plate and the second movable plate can extend or contract relative to each other.

[0008] As an optional solution for the guide structure, the guide assembly also includes a first positioning seat and a drive rod, the drive rod is connected to the drive member and fixedly connected to the guide plate; there are two first positioning seats, which are relatively arranged on both sides of the main chassis, one end of the drive rod is arranged corresponding to the first positioning seat on one side, and the other end of the drive rod is arranged corresponding to the first positioning seat on the other side, and the drive rod is rotatably connected to the first positioning seat.

[0009] As an optional solution for the diversion structure, the diversion assembly also includes a second positioning seat and a first connecting rod, and the first connecting rod is fixedly connected to one end of the second movable plate; there are two second positioning seats, and they are relatively arranged on both sides of the main chassis, one end of the first connecting rod corresponds to the second positioning seat on one side, and the other end of the first connecting rod corresponds to the second positioning seat on the other side, and the first connecting rod is rotatably connected to the second positioning seat.

[0010] As an optional solution of the guide structure, the guide assembly further includes a second connecting rod, and the guide plate and the first movable plate are both rotatably connected to the second connecting rod.

[0011] As an optional solution to the flow guide structure, the flow guide structure provided in the present application also includes a noise reduction component, and the noise reduction component is arranged in a vortex generating area enclosed by the flow guide component and the main chassis.

[0012] As an optional solution to the flow-guiding structure, the noise reduction assembly includes a noise reduction component and an oil-proof component, and the noise reduction component is arranged inside the oil-proof component.

[0013] Compared with the prior art, the flow guide structure provided by the present invention has the following advantages:

[0014] The guide structure provided by the utility model is used to block the vortex generating area in the main box of the range hood, and includes a driving component and a guide assembly; the guide assembly includes a guide plate, the driving component is connected to one end of the guide plate and can drive the guide plate to rotate, and the other end of the guide plate extends in the direction of the centrifugal fan close to the range hood.

[0015] From this analysis, it can be seen that by setting a driving component and a guide component in the vortex generating area within the main case, and the output end of the driving component is connected to one end of the guide plate, and the other end of the guide plate extends toward the centrifugal fan close to the range hood, the vortex generating area can be shielded by the guide plate. Accordingly, under the guiding action of the guide plate, the air flows toward the centrifugal fan, so that the airflow will not enter the vortex generating area, thereby reducing to a certain extent the problem of smoke entering the vortex generating area and generating noise that affects the user experience.

[0016] Since the guide plate in this application is connected to the driving component, and the driving component can drive the guide plate to rotate, the guide plate can adjust the relative inclination angle of the guide plate according to different air intake volumes and power conditions, thereby improving the smoke diversion capacity while avoiding the problem of smoke entering the vortex generating area to form a vortex and generate noise.

[0017] In addition, the utility model also provides a range hood, including a smoke collection chamber, a main case, a centrifugal fan and the above-mentioned guide structure; the centrifugal fan and the guide structure are both arranged in the main case, the smoke collection chamber is connected to the main case, and a smoke inlet is formed at one end of the smoke collection chamber away from the main case.

[0018] As an optional solution for the range hood, the range hood provided by the present invention further includes a lighting component. The main chassis is formed with a receiving portion, the lighting component is arranged in the receiving portion, and the light-emitting side of the lighting component faces outward.

[0019] As an optional solution for the range hood, the range hood provided by the present invention further includes a fan bracket, and the centrifugal fan is connected to the main box through the fan bracket.

[0020] The volume of the main case of the range hood provided in the present application is larger than that of the smoke collecting chamber. Therefore, a 90° angle is formed at the expansion portion, namely the above-mentioned vortex generating area. The guide structure provided in the present application is adopted. Since the guide structure is arranged at the expansion portion (vortex generating area), it can block the vortex generating area to a certain extent, greatly reducing the problem of smoke entering the vortex generating area to form vortices and generate noise, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of the overall structure of the diversion structure provided by an embodiment of the utility model;

[0023] Figure 2 for Figure 1 A partial enlarged view of point A in the middle;

[0024] Figure 3 A schematic structural diagram of a range hood provided by an embodiment of the present utility model;

[0025] Figure 4 for Figure 3 A partial enlarged view of point B in the middle;

[0026] Figure 5 A schematic structural diagram of a first noise reduction component in a range hood provided by an embodiment of the present utility model;

[0027] Figure 6 This is a structural schematic diagram of the second noise reduction component in the range hood provided by an embodiment of the utility model.

[0028] In the figure: 1- guide plate; 2- first movable plate; 201- guide protrusion; 3- second movable plate; 4- driving rod; 5- driving component; 501- base; 6- first positioning seat; 7- first connecting rod; 8- second positioning seat; 9- second connecting rod; 10- main chassis; 1001- vortex generating area; 1002- mounting table; 11- noise reduction component; 12- oil-proof component; 13- centrifugal fan; 14- smoke collecting chamber; 15- fan bracket; 16- lighting component. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of this application.

[0030] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or are the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model 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 operate in a specific orientation. Therefore, they should not be understood as limiting the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0031] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0032] In the description of the embodiments of the present application, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0034] For ease of description, spatially relative terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as illustrated in the drawings. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0035] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0036] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0037] The features of the examples described herein may be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have various configurations, other configurations are possible, as will be apparent upon understanding the disclosure of this application. In addition, the technical solutions between the various embodiments may be combined with each other, but this must be based on the ability of a person of ordinary skill in the art to implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0038] like Figures 1-4As shown, the utility model provides a guide structure for shielding the vortex generating area 1001 in the main case 10 of the range hood, including a driving component 5 and a guide assembly; the guide assembly includes a guide plate 1, the driving component 5 is connected to one end of the guide plate 1, and can drive the guide plate 1 to rotate, and the other end of the guide plate 1 extends in the direction of the centrifugal fan 13 close to the range hood.

[0039] Compared with the prior art, the flow guide structure provided by the present invention has the following advantages:

[0040] The diversion structure provided by the present invention is such that a driving component 5 and a diversion assembly are arranged in the vortex generating area 1001 in the main case 10, and the output end of the driving component 5 is connected to one end of the diversion plate 1, and the other end of the diversion plate 1 extends toward the centrifugal fan 13 close to the range hood, so that the vortex generating area 1001 can be shielded by the diversion plate 1. Accordingly, the smoke flow flows toward the centrifugal fan 13 under the diversion action of the diversion plate 1, so that the smoke flow will not enter the vortex generating area 1001, thereby reducing to a certain extent the problem of noise generated by the smoke entering the vortex generating area 1001 and affecting the user experience.

[0041] Since the guide plate 1 in the present application is connected to the driving component 5, and the driving component 5 can drive the guide plate 1 to rotate, the guide plate 1 can adjust the relative inclination angle of the guide plate 1 according to different air intake volumes and power conditions, thereby improving the smoke diversion capacity while avoiding the problem of smoke entering the vortex generating area 1001 to form a vortex and generate noise.

[0042] It should be noted here that the size of the main case 10 of the range hood in the present application is larger than the size of the smoke collecting chamber 14. Therefore, a mounting platform 1002 is formed at the connection point between the smoke collecting chamber 14 and the main case 10. The above-mentioned driving component 5 of the present application is arranged on the mounting platform 1002, and in the present embodiment, preferably, the end of the guide plate 1 away from the driving component 5 can be fitted with the inner side of the front wall of the main case 10, so that the guide plate 1 and the front wall of the main case 10 and the mounting platform 1002 form a triangular structure, which is more stable on the one hand, and can also make the corresponding space relatively closed on the other hand, that is, the vortex generating area 1001 is closed to eliminate the vortex generating area 1001.

[0043] Alternatively, as Figure 1-Figure 3 As shown, the guide assembly in the present application also includes a first movable plate 2 and a second movable plate 3. One end of the first movable plate 2 is rotatably connected to the end of the guide plate 1 away from the driving member 5, and the other end is nested with the second movable plate 3. One end of the second movable plate 3 is rotatably connected to the inner wall of the main chassis 10. The first movable plate 2 and the second movable plate 3 can be extended or contracted relative to each other.

[0044] Another embodiment of the present application is to further increase the shielding ability and installation flexibility of the above-mentioned vortex generating area 1001 by arranging a first movable plate 2 at one end of the guide plate 1 away from the driving member 5, and further arranging a second movable plate 3 nested with the first movable plate 2. In this embodiment, one end of the first movable plate 2 is rotatably connected to the guide plate 1, and the first movable plate 2 and the second movable plate 3 are nested, so that relative extension or contraction can be generated. Accordingly, the other end of the second movable plate 3 is rotatably connected to the inner side of the front wall of the main chassis 10, so that the adjustment range and coverage area can be further increased.

[0045] It can be understood that in this embodiment, the guide plate 1, the first movable plate 2 and the second movable plate 3 cooperate with the main chassis 10 to form a structure that is approximately a right-angled trapezoid. When the angle between the guide plate 1 and the above-mentioned mounting platform 1002 becomes smaller, the first movable plate 2 and the second movable plate 3 are contracted, and when the angle between the guide plate 1 and the above-mentioned mounting platform 1002 becomes larger, the first movable plate 2 and the second movable plate 3 are stretched.

[0046] It is necessary to add that, if Figure 2 As shown, a guide protrusion 201 is formed on the inner side of the first movable plate 2 in the present application, and correspondingly, a matching recess is formed on the second movable plate 3 at the position corresponding to the guide protrusion 201. Thus, through the cooperation between the guide protrusion 201 and the matching recess, the relative extension or contraction between the first movable plate 2 and the second movable plate 3 can be achieved, and the problem of jamming, bending and damage during the movement process can be avoided.

[0047] Alternatively, as Figure 1-Figure 3 As shown, the guide assembly in the present application also includes a first positioning seat 6 and a driving rod 4, the driving rod 4 is connected to the driving member 5, and is fixedly connected to the guide plate 1; there are two first positioning seats 6, and they are relatively arranged on both sides of the main box 10, one end of the driving rod 4 corresponds to the first positioning seat 6 on one side, and the other end of the driving rod 4 corresponds to the first positioning seat 6 on the other side, and the driving rod 4 is rotatably connected to the first positioning seat 6.

[0048] The driving component 5 in this application is a motor, and the motor is arranged in the middle position of the guide plate 1. The guide plate 1 is formed with an avoidance portion corresponding to the position of the motor, and the guide plate 1 is connected to the output shaft of the motor through the driving rod 4, so that the guide plate 1 can be driven by the motor to change the diversion angle.

[0049] It should be noted that the motor in the present application is arranged on the above-mentioned mounting platform 1002 through its own base 501, and the body of the motor is fixed so that the output shaft rotates to drive the movement of the guide plate 1.

[0050] Accordingly, the present application can provide a mounting base for both ends of the drive rod 4 by relatively arranging two first positioning seats 6 on both sides of the main case 10, and since the drive rod 4 needs to be fixedly connected to the guide plate 1 and rotate to realize the rotation of the guide plate 1, the drive rod 4 needs to be able to rotate relative to the side wall of the main case 10, so that the two ends of the drive rod 4 in the present application are rotatably connected to the first positioning seats 6, and the method of realizing the rotational connection can adopt clearance fit or installation of bearings, etc., which will not be repeated here.

[0051] Accordingly, if Figure 1-Figure 3 As shown, the guide assembly in the present application also includes a second positioning seat 8 and a first connecting rod 7, and the first connecting rod 7 is fixedly connected to one end of the second movable plate 3; the number of second positioning seats 8 is two, and they are relatively arranged on both sides of the main chassis 10, one end of the first connecting rod 7 corresponds to the second positioning seat 8 on one side, and the other end of the first connecting rod 7 corresponds to the second positioning seat 8 on the other side, and the first connecting rod 7 is rotatably connected to the second positioning seat 8.

[0052] In this application, the function of the second positioning seat 8 is consistent with that of the first positioning seat 6, and the first connecting rod 7 can connect one end of the second movable plate 3 to the second positioning seat 8, thereby making the connection and shielding of the overall guide structure more stable and tight.

[0053] It is understandable that if Figure 1 Combine Figure 3 As shown, the guide assembly in the present application further includes a second connecting rod 9 , and the guide plate 1 and the first movable plate 2 are both rotatably connected to the second connecting rod 9 .

[0054] It should be noted here that the front wall of the main box 10 mentioned above in this application refers to the side wall that is closer to the user after the range hood is installed in the user's kitchen. Correspondingly, the rear wall of the main box 10 is the side wall that is attached to the wall. Therefore, the side walls of the main box 10 mentioned above are the walls on both sides of the front wall and the rear wall.

[0055] Preferably, if Figure 5 Combine Figure 6 As shown, the flow guide structure provided by the present invention further includes a noise reduction component, which is arranged in a vortex generating area 1001 enclosed by the flow guide component and the main box 10.

[0056] Since the guide component in the present application mainly plays the role of guiding the smoke, the present application can absorb the sound entering the vortex generating area 1001 to a certain extent by further setting a noise reduction component in the vortex generating area 1001, thereby being able to further reduce the diffusion of noise on the basis of eliminating the noise generated by the vortex, thereby improving the overall noise reduction effect of the range hood.

[0057] like Figure 5Combine Figure 6 As shown, the noise reduction assembly in the present application includes a noise reduction component 11 and an oil-proof component 12 , and the noise reduction component 11 is disposed inside the oil-proof component 12 .

[0058] Since the above-mentioned guide plate 1 and the first movable plate 2 and the second movable plate 3 in the present application are not actually sealed with the side walls and the front wall of the main case 10, when the oil smoke passes through, a small amount of oil smoke will still enter the vortex generating area 1001. Since the present application further provides a noise reduction component 11 in the vortex generating area 1001, and the noise reduction component 11 in the present application is sound-absorbing cotton, the sound-absorbing cotton has a certain oil absorption capacity. Therefore, the smoke entering the vortex generating area 1001 will contaminate the sound-absorbing cotton, and the noise reduction effect of the sound-absorbing cotton will be reduced after long-term use.

[0059] The present application further adds an oil-proof component 12 on the outside of the noise reduction component 11 , which can block the pollution of smoke to the sound-absorbing cotton to a certain extent and increase the service life of the noise reduction component 11 .

[0060] And as Figure 5 As shown, in Figure 5 In the embodiment shown, the oil-proof component 12 is a perforated plate. On the basis of achieving a certain degree of oil-proof effect, the porous structure can also achieve a certain degree of sound insulation and noise reduction effect, thereby further improving the noise reduction capability of the overall noise reduction component.

[0061] Accordingly, in Figure 5 In the illustrated embodiment, the oil-proof component 12 is a grid structure, which can also achieve a certain degree of oil-proof effect.

[0062] In addition, the utility model also provides a range hood, including a smoke collection chamber 14, a main case 10, a centrifugal fan 13 and the above-mentioned guide structure; the centrifugal fan 13 and the guide structure are both arranged in the main case 10, the smoke collection chamber 14 is connected to the main case 10, and the smoke collection chamber 14 forms a smoke inlet at one end away from the main case 10.

[0063] The volume of the main case 10 in the range hood provided in the present application is larger than that of the smoke collecting chamber 14. Therefore, a 90° angle is formed at the expansion portion, namely the above-mentioned vortex generating area 1001. The guide structure provided in the present application is adopted. Since the guide structure is arranged at the expansion portion (vortex generating area 1001), the vortex generating area 1001 can be shielded to a certain extent, thereby greatly reducing the problem of smoke entering the vortex generating area 1001 to form a vortex and generate noise, thereby improving the user experience.

[0064] like Figure 2As shown, during actual operation, smoke enters from the smoke collecting chamber 14. Since the smoke collecting chamber 14 is connected to the main chassis 10, and the size of the main chassis 10 is expanded at the connection point, a mounting platform 1002 is formed, and the mounting platform 1002 corresponds to the vortex generating area 1001. The present application arranges the guide structure on the mounting platform 1002, and actually arranges the driving member 5 on the mounting platform 1002, and connects the guide plate 1 to the output end of the driving member 5, thereby achieving the drive of the guide plate 1 and maintaining the guide plate 1 at a certain angle to guide the smoke.

[0065] When the exhaust volume changes, the range hood's own control system can be used to control the driving component 5 to adjust the guide plate 1, so as to achieve different angle changes of the guide plate 1 according to different needs, making the diversion capacity more targeted, improving the overall performance of the range hood, and reducing the noise generation area.

[0066] Alternatively, as Figure 5 As shown, the range hood provided by the present invention also includes a lighting component 16. The main case 10 is formed with a accommodating portion, and the accommodating portion is actually formed on the above-mentioned mounting platform 1002 and protrudes from the above-mentioned vortex generating area 1001, so that the lighting component 16 can be stably accommodated. The lighting component 16 can provide a certain degree of supplementary lighting for the user's stove area, thereby improving the user experience.

[0067] like Figure 5 As shown, in the present application, the light-emitting side of the lighting component 16 faces outward, which means that the accommodating portion is a closed groove-shaped structure, and the lighting component 16 is embedded in the accommodating portion, so that the light emitted by the light-emitting surface of the lighting component 16 can directly illuminate the stove, providing lighting for the user when cooking.

[0068] It should be noted that, since a housing portion protruding from the vortex generating area 1001 is formed on the main chassis 10, it will occupy a portion of the space in the vortex generating area 1001. Therefore, when a housing portion is formed in the vortex generating area 1001, the above-mentioned oil-proof member 12 can adopt a perforated plate with a smaller size in the thickness direction of the range hood in combination with a sound-absorbing cotton structure to avoid interference between the protruding portion and the oil-proof member 12, resulting in the problem that the oil-proof member 12 cannot be stably assembled. Of course, the oil-proof member 12 in the present application can also adopt a method of forming an avoidance gap at the position corresponding to the housing portion, so as to achieve stable assembly without interfering with the housing portion.

[0069] Alternatively, as Figure 2 As shown, the range hood provided by the present invention further includes a fan bracket 15 , and the centrifugal fan 13 is connected to the main chassis 10 via the fan bracket 15 .

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flow guide structure for shielding the vortex generating area in the main case of a range hood, characterized in that: including a driving component and a flow guide component; The guide assembly includes a guide plate, the driving component is connected to one end of the guide plate and can drive the guide plate to rotate, and the other end of the guide plate extends in a direction close to the centrifugal fan of the range hood.

2. The flow guide structure according to claim 1, characterized in that: The guide assembly also includes a first movable plate and a second movable plate, one end of the first movable plate is rotatably connected to an end of the guide plate away from the driving component, the other end of the first movable plate is nested with the second movable plate, one end of the second movable plate is rotatably connected to the inner wall of the main chassis, and the first movable plate and the second movable plate can extend or contract relative to each other.

3. The flow guide structure according to claim 2, characterized in that: The deflector assembly further includes a first positioning seat and a driving rod, wherein the driving rod is connected to the driving member and fixedly connected to the deflector; There are two first positioning seats, which are relatively arranged on both sides of the main chassis. One end of the driving rod corresponds to the first positioning seat on one side, and the other end of the driving rod corresponds to the first positioning seat on the other side, and the driving rod is rotatably connected to the first positioning seat.

4. The flow guide structure according to claim 2, characterized in that: The guide assembly further includes a second positioning seat and a first connecting rod, wherein the first connecting rod is fixedly connected to one end of the second movable plate; There are two second positioning seats, which are relatively arranged on both sides of the main chassis. One end of the first connecting rod corresponds to the second positioning seat on one side, and the other end of the first connecting rod corresponds to the second positioning seat on the other side, and the first connecting rod is rotatably connected to the second positioning seat.

5. The flow guide structure according to claim 2, characterized in that: The guide assembly further includes a second connecting rod, and the guide plate and the first movable plate are both rotatably connected to the second connecting rod.

6. The flow guide structure according to claim 1, characterized in that: It also includes a noise reduction component, which is arranged in a vortex generating area enclosed by the guide component and the main box.

7. The flow guide structure according to claim 6, characterized in that: The noise reduction assembly includes a noise reduction member and an oil prevention member, and the noise reduction member is disposed within the oil prevention member.

8. A range hood, characterized in that: It comprises a smoke collecting chamber, a main box, a centrifugal fan and the flow guide structure described in any one of claims 1 to 7; The centrifugal fan and the flow guide structure are both arranged in the main chassis. The smoke collecting chamber is communicated with the main chassis, and a smoke inlet is formed at one end of the smoke collecting chamber away from the main chassis.

9. The range hood according to claim 8, characterized in that: The main chassis further includes a lighting component. The main chassis is formed with a receiving portion. The lighting component is arranged in the receiving portion, and the light-emitting side of the lighting component faces outward.

10. The range hood according to claim 8, characterized in that: It also includes a fan bracket, and the centrifugal fan is connected to the main box through the fan bracket.

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