Range hood

Abstract

The utility model relates to a range hood, which comprises a fan frame, the exhaust fume collecting hood is located below the fan frame, and the bottom of the exhaust fume collecting hood is provided with a first exhaust inlet and a second exhaust inlet which are arranged at an interval in the left-right direction; a first air duct communicated with the first air suction opening and the inner space of the fan frame and a second air duct communicated with the second air suction opening and the inner space of the fan frame are defined in the exhaust fume collecting hood, and a first air inlet grille assembly capable of changing the ventilation air volume of the first air duct is arranged on the flowing path of the first air duct; a second air inlet grille assembly capable of changing the ventilation air volume of the second air duct is arranged on the flowing path of the second air duct. The range hood has the advantages that left and right flows can be reasonably distributed, and the cooking side oil smoke suction effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to kitchen appliance technical field especially, relate to a kind of range hood. BACKGROUND

[0002] Range hood is a kind of kitchen appliance that purifies kitchen environment. Range hood is generally divided into top suction type range hood and near suction type range hood. But the existing top suction type range hood generally only has a bottom middle air inlet, and its smoke suction effect is poor, and oil fume is easy to escape from the side.

[0003] Therefore, the Chinese utility model patent application with application number CN202221358667.5 (authorized announcement number: CN217928918U) discloses a T-shaped smoke machine, which includes a smoke collecting hood and an air exhaust shell. The bottom of the smoke collecting hood is provided with a main smoke collecting structure and an auxiliary smoke collecting structure. The main smoke collecting structure is used to define a concave main smoke collecting cavity, and the auxiliary smoke collecting structure is used to define a concave auxiliary smoke collecting cavity. Both the main smoke collecting cavity and the auxiliary smoke collecting cavity can be used to collect oil fume. Simultaneous air intake and smoke suction through the main smoke suction port group corresponding to the main smoke collecting cavity and the auxiliary smoke suction port group corresponding to the auxiliary smoke collecting cavity can improve the oil fume suction and exhaust efficiency of the T-shaped smoke machine. By increasing the auxiliary smoke collecting structure and the auxiliary smoke suction port group on the left and right sides of the main smoke suction port group, the escape of oil fume from the side can be effectively prevented. The Chinese utility model patent application with application number CN202123352958.1 (authorized announcement number: CN217209498U) also makes a similar disclosure.

[0004] However, the range hood in the above patent application still has some deficiencies. Generally, the cooking range corresponding to the range hood has two left and right burners. For the case of unilateral cooking of the user, the above range hood cannot adjust the flow rates of the left and right sides, but directly increases the rotation speed of the impeller to increase the total air volume of the range hood. The increase in the total air volume leads to the simultaneous increase in the air volume of the left and right sides, but also causes a significant increase in noise, reduces the user experience, and the actual cooking occurs on one side. The simultaneous increase in the air volume of the two sides leads to the waste of energy of the other side.

[0005] Therefore, the existing range hood needs to be further improved. UTILITY MODEL CONTENTS

[0006] The utility model solves the technical problem in the prior art, and provides a range hood that can reasonably distribute the flow rates of the left and right sides and improve the cooking side suction effect of the range hood.

[0007] The utility model solves the above technical problem by adopting the following technical scheme: a range hood, comprising:

[0008] A fan frame;

[0009] A fume hood is arranged below the fan stand, and the bottom of the fume hood is provided with a first air inlet and a second air inlet arranged at intervals in the left-right direction;

[0010] The fume hood is provided with a first air duct communicating with the first air inlet and the interior space of the fan stand and a second air duct communicating with the second air inlet and the interior space of the fan stand, and the flow path of the first air duct is provided with a first air inlet grille assembly capable of changing the ventilation volume of the first air duct, and the flow path of the second air duct is provided with a second air inlet grille assembly capable of changing the ventilation volume of the second air duct.

[0011] In order to facilitate the installation of the first air inlet grille assembly and the second air inlet grille assembly, the first air duct is provided with a first air outlet communicating with the interior space of the fan stand, the second air duct is provided with a second air outlet communicating with the interior space of the fan stand, the first air inlet grille assembly is arranged at the first air outlet, and the second air inlet grille assembly is arranged at the second air outlet.

[0012] In order to simplify the structure of the above-mentioned air inlet grille assembly and reduce the cost, the first air inlet grille assembly comprises:

[0013] A first fixed grille distributed with first air inlets;

[0014] A first movable grille arranged on the upstream side or the downstream side of the first fixed grille and distributed with second air inlets, and the first movable grille is driven by a first driving mechanism to move relative to the first fixed grille along the extension direction of the first fixed grille to change the overlapping area of the first air inlets on the first fixed grille and the second air inlets on the first movable grille;

[0015] The second air inlet grille assembly comprises:

[0016] A second fixed grille distributed with third air inlets;

[0017] A second movable grille arranged on the upstream side or the downstream side of the second fixed grille and distributed with fourth air inlets, and the second movable grille is driven by a second driving mechanism to move relative to the second fixed grille along the extension direction of the second fixed grille to change the overlapping area of the third air inlets on the second fixed grille and the fourth air inlets on the second movable grille.

[0018] The movable grille of the above-mentioned air inlet grille assembly adjusts the corresponding air inlet volume through linear movement, and it is conceivable that the movable grille can adjust the air inlet volume through rotary movement (the rotary axis is perpendicular to the movable grille) or through deflection movement, such as the movable grille having multiple deflection blades to change the effective ventilation area of the corresponding air inlets.

[0019] In order to ensure the stability of the movement of the movable grid relative to the fixed grid, a first limiting sliding groove is formed on one of the first fixed grid and the first movable grid, and a first limiting column is arranged on the other one to be slidingly constrained in the first limiting sliding groove, and the extending direction of the first limiting sliding groove is consistent with the moving direction of the first movable grid;

[0020] A second limiting sliding groove is formed on one of the second fixed grid and the second movable grid, and a second limiting column is arranged on the other one to be slidingly constrained in the second limiting sliding groove, and the extending direction of the second limiting sliding groove is consistent with the moving direction of the second movable grid.

[0021] It is conceivable that a guide rail assembly or a ball assembly can be arranged between the fixed grid and the movable grid to ensure the stability and flexibility of the relative movement therebetween.

[0022] In order to shorten the moving stroke of the movable grid relative to the fixed grid as much as possible on the basis of ensuring that the grid assembly can adjust the air volume, and avoid occupying a large space in the smoke hood or the fan rack, each of the first air inlet holes on the first fixed grid and each of the second air inlet holes on the first movable grid is a strip-shaped hole, and the extending direction of each strip-shaped hole is perpendicular to the moving direction of the first movable grid.

[0023] Each of the third air inlet holes on the second fixed grid and each of the fourth air inlet holes on the second movable grid is a strip-shaped hole, and the extending direction of each strip-shaped hole is perpendicular to the moving direction of the second movable grid.

[0024] In order to adapt to the first air duct and the second air duct on the left and right sides of the smoke hood, the first air outlet of the first air duct and the second air outlet of the second air duct are both strip-shaped openings extending in the front-rear direction, and the first air outlet and the second air outlet are opposite in the left-right direction, and the moving direction of the first movable grid and the moving direction of the second movable grid are both in the front-rear direction.

[0025] Generally, the first driving mechanism for driving the first air inlet grid assembly to move and the second driving mechanism for driving the second air inlet grid assembly to move can adopt different driving mechanisms independent of each other, such as two independent electric push rods. However, in order to reduce the number of driving mechanisms, reduce the occupied space in the cabinet, and reduce the cost, the total area of the overlapping of each first air inlet hole and each second air inlet hole on the first air inlet grid assembly is denoted as S1, the total area of the overlapping of each third air inlet hole and each fourth air inlet hole on the second air inlet grid assembly is denoted as S2, the first driving mechanism and the second driving mechanism share the same driving member, and the first air inlet grid assembly and the second air inlet grid assembly driven by the driving member have at least a first state, a second state and a third state:

[0026] In the first state, S1 is equal to S2, and S1 and S2 are both not zero;

[0027] In the second state, S1 is greater than S2, and S2 is greater than or equal to zero;

[0028] In the third state, S2 is less than S1, and S1 is greater than or equal to zero.

[0029] As an improvement, the driving member comprises a driving motor, an output shaft of the driving motor is connected with a left-right extending transmission shaft, the transmission shaft can be driven by the driving motor to rotate around its axis, a first end of the transmission shaft is connected with the first movable grating transmission through a first connecting rod assembly, and a second end of the transmission shaft is connected with the second movable grating transmission through a second connecting rod assembly.

[0030] Further improvement, the first connecting rod assembly comprises a first connecting rod and a second connecting rod, a first end of the first connecting rod is connected with the first end of the transmission shaft and rotates around the axis of the transmission shaft under the driving of the transmission shaft, a first end of the second connecting rod is rotationally connected with a second end of the first connecting rod, and a second end of the second connecting rod is rotationally connected with the first movable grating;

[0031] The second connecting rod assembly comprises a third connecting rod and a fourth connecting rod, a first end of the third connecting rod is connected with the second end of the transmission shaft and rotates around the axis of the transmission shaft under the driving of the transmission shaft, a first end of the fourth connecting rod is rotationally connected with a second end of the third connecting rod, and a second end of the fourth connecting rod is rotationally connected with the second movable grating;

[0032] The driving motor, the transmission shaft and the first connecting rod assembly constitute the first driving mechanism, and the driving motor, the transmission shaft and the second connecting rod assembly constitute the second driving mechanism.

[0033] In order to facilitate the installation of the transmission shaft, the left and right ends of the transmission shaft are rotationally supported on the first fixed grating and the second fixed grating respectively, a first shaft hole is formed in the first fixed grating for the first end of the transmission shaft to pass through, and a second shaft hole is formed in the second fixed grating for the second end of the transmission shaft to pass through.

[0034] In order to avoid the driving motor, the transmission shaft and other components from being contaminated by contacting oil fume, the front side or the rear side of the smoke collecting cover further defines a mounting chamber for placing the driving motor and the transmission shaft.

[0035] In order to ensure the effect of the range hood, the bottom of the smoke collecting cover is further provided with a main air inlet between the first air inlet and the second air inlet, the main air inlet is located directly below the fan frame, and an oil screen is arranged at the main air inlet. During cooking operation, the oil fume that cannot be sucked into the main air inlet can be sucked into the first air inlet or the second air inlet during flowing to the left and right sides, so that the oil fume escape is reduced.

[0036] Compared with the prior art, the advantages of the utility model are: the first air inlet and the second air inlet of the smoke collecting cover of the range hood are respectively provided with a first air inlet grille assembly and a second air inlet grille assembly, the two air inlet assemblies can be driven by the corresponding driving mechanisms to change the air inlet volume of the first air duct and the second air duct, thereby adjusting the smoke suction effect of the first air inlet and the second air inlet on the left and right sides, solving the problem that the same side of the range hood corresponding to unilateral cooking can greatly improve the oil fume suction effect and reduce the oil fume escape problem. This structure design does not need to increase the total air volume of the centrifugal fan, that is, the centrifugal fan impeller speed can remain unchanged, without increasing the noise problem and the fan energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a three-dimensional structure schematic view of the range hood of the utility model embodiment;

[0038] Figure 2 It is a transverse sectional view of the range hood of the utility model embodiment;

[0039] Figure 3 It is Figure 2 It is an enlarged view of A in the middle;

[0040] Figure 4 It is a three-dimensional structure schematic view of the range hood of the utility model embodiment after part of the side plate of the smoke collecting cover is removed;

[0041] Figure 5 It is a three-dimensional structure schematic view of the range hood of the utility model embodiment after part of the side plate of the smoke collecting cover is removed;

[0042] Figure 6 It is a three-dimensional structure schematic view of the first air inlet grille assembly and the second air inlet grille assembly cooperating with the corresponding driving mechanisms (the first air inlet grille assembly and the second air inlet grille assembly are both in a partially open state);

[0043] Figure 7 It is a three-dimensional structure schematic view of the first air inlet grille assembly and the second air inlet grille assembly cooperating with the corresponding driving mechanisms (the first air inlet grille assembly is in a maximum open state, and the second air inlet grille assembly is in a closed state). DETAILED DESCRIPTION

[0044] The utility model will be described in further detail below with reference to the drawings.

[0045] In the description and claims of the utility model, terms of direction, such as "front", "back", "up", "down", "left", "right", "side", "top", "bottom" and the like, are used to describe various example structural parts and elements of the utility model, but these terms are used herein only for the purpose of convenience of description and are determined based on the example orientation shown in the drawings. Since the disclosed embodiments of the utility model can be arranged in different directions, these terms of direction are only for illustration and should not be considered as limitation, such as "up" and "down" are not necessarily limited to the direction opposite or consistent with the direction of gravity.

[0046] Figures 1-7 A preferred embodiment of the utility model is shown. The range hood includes a fan frame 11, a smoke collecting hood 12, a centrifugal fan 13, a first air inlet grille assembly 20, a second air inlet grille assembly 30, a first driving mechanism and a second driving mechanism.

[0047] The smoke collecting hood 12 is arranged at the bottom of the fan frame 11, and the inner cavity of the fan frame 11 is in communication with the inner cavity of the smoke collecting hood 12. The bottom of the smoke collecting hood 12 is provided with an air inlet, and external smoke can enter the smoke collecting hood 12 through the air inlet. The centrifugal fan 13 is arranged in the fan frame 11, and the centrifugal fan 13 generates negative pressure when operating, and external oil fume can be sucked into the smoke collecting hood 12 through the air inlet. The air inlet of the smoke collecting hood 12 includes a main air inlet 120 located in the middle position and auxiliary air inlets located on the left and right sides of the main air inlet 120, and the auxiliary air inlets include a first air inlet 1201 located on the left side and a second air inlet 1202 located on the right side. The main air inlet 120 corresponds to the position directly below the fan frame 11, and an oil screen 124 is further arranged at the main air inlet 120 for filtering oil fume.

[0048] The left and right dimensions of the main body of the smoke hood 12 are greater than the left and right dimensions of the main body of the fan stand 11. A first air duct 1211 is defined in the left portion of the smoke hood 12 (i.e. the shoulder portion protruding to the left relative to the main body of the fan stand 11), and a second air duct 1212 is defined in the right portion of the smoke hood 12 (i.e. the shoulder portion protruding to the right relative to the main body of the fan stand 11). The bottom of the smoke hood 12 further has two smoke collecting cavities recessed upward, i.e. a left first smoke collecting cavity 1203 and a right second smoke collecting cavity 1204. The cross sections (vertical sections cut along the left-right direction) of the first smoke collecting cavity 1203 and the second smoke collecting cavity 1204 are both triangular in shape with the top smaller than the bottom. The top of the first smoke collecting cavity 1203 is provided with a strip-shaped air inlet connected to the first air duct 1211, which forms the first air inlet 1201. Similarly, the top of the second smoke collecting cavity 1204 is provided with a strip-shaped air inlet connected to the second air duct 1212, which forms the second air inlet 1202. The first air inlet 1201 and the second air inlet 1202 both extend along the front-rear direction.

[0049] As shown in Figure 2 the first air duct 1211 and the second air duct 1212 both extend along the left-right direction. The size (width in the up-down direction) of the first air duct 1211 gradually increases from left to right, and a first air outlet 1221 is formed at the position where the smoke hood 12 connects to the fan stand 11. The first air outlet 1221 is a strip-shaped opening arranged along the front-rear direction. The first air inlet grille assembly 20 is arranged at the first air outlet 1221. The first air duct 1211 of the smoke hood 12 is further provided with a first arc-shaped flow guide wall at the position opposite to the first air inlet 1201, which guides the smoke to the right. The size (width in the up-down direction) of the second air duct 1212 gradually increases from right to left, and a second air outlet 1222 is formed at the position where the smoke hood 12 connects to the fan stand 11. The second air outlet 1222 is a strip-shaped opening arranged along the front-rear direction. The second air inlet grille assembly 30 is arranged at the second air outlet 1222. The second air duct 1212 of the smoke hood 12 is further provided with a second arc-shaped flow guide wall at the position opposite to the second air inlet 1202, which guides the smoke to the left.

[0050] The first air inlet grille assembly 20 includes a first fixed grille 21 and a first movable grille 22. The first fixed grille 21 and the first movable grille 22 both extend along the front-rear direction and are attached to each other. Figure 4As shown, the first movable grille 22 is arranged on the upstream side of the first fixed grille 21 (i.e. the side away from the main body of the fan stand 11). The first fixed grille 21 is provided with first air inlet holes 210, each of which is arranged in sequence and at intervals in the front-rear direction, and each of which is a vertically extending strip-shaped hole. Correspondingly, the first movable grille 22 is provided with second air inlet holes 220, each of which is also arranged in sequence and at intervals in the front-rear direction, and each of which is also a vertically extending (i.e. perpendicular to the moving direction of the first movable grille 22) strip-shaped hole. The above-mentioned first movable grille 22 can be driven by the first driving mechanism to move relative to the first fixed grille 21 along the extension direction (specifically the front-rear direction) of the first fixed grille 21, so as to change the overlapping area of the first air inlet holes 210 on the first fixed grille 21 and the second air inlet holes 220 on the first movable grille 22, i.e. to change the air volume of the first air duct 1211. The second air inlet grille assembly 30 includes a second fixed grille 31 and a second movable grille 32. The second fixed grille 31 and the second movable grille 32 are arranged in the front-rear direction and are attached to each other. Figure 5 As shown, the second movable grille 32 is arranged on the upstream side of the second fixed grille 31 (i.e. the side away from the main body of the fan stand 11). The second fixed grille 31 is provided with third air inlet holes 310, each of which is arranged in sequence and at intervals in the front-rear direction, and each of which is a vertically extending strip-shaped hole. Correspondingly, the second movable grille 32 is provided with fourth air inlet holes 320, each of which is also arranged in sequence and at intervals in the front-rear direction, and each of which is also a vertically extending (i.e. perpendicular to the moving direction of the second movable grille 32) strip-shaped hole. The above-mentioned second movable grille 32 can be driven by the second driving mechanism to move relative to the second fixed grille 31 along the extension direction (specifically the front-rear direction) of the second fixed grille 31, so as to change the overlapping area of the third air inlet holes 310 on the second fixed grille 31 and the fourth air inlet holes 320 on the second movable grille 32, i.e. to change the air volume of the second air duct 1212. The corresponding air inlet holes on the above-mentioned first fixed grille 21, first movable grille 22, second fixed grille 31 and second movable grille 32 adopt vertically extending strip-shaped holes, i.e. perpendicular to the moving direction of the corresponding movable grille, which can shorten the moving stroke of the movable grille relative to the fixed grille as much as possible on the basis of ensuring that the grille assembly can adjust the air volume, and avoid occupying a large space in the smoke hood 12 or the fan stand 11.

[0051] One of the first fixed grille 21 and the first movable grille 22 is provided with a first limiting sliding groove 221, and the other is provided with a first limiting column 211 which is slidingly constrained in the first limiting sliding groove 221, and the extension direction of the above-mentioned first limiting sliding groove 221 is consistent with the moving direction of the first movable grille 22. Specifically, as shown in the drawings, the first limiting sliding groove 221 is arranged on the first movable grille 22, and the first limiting column 211 is arranged on the first fixed grille 21.Figure 4 As shown, the first movable grid 22 is provided with a plurality of first limiting sliding grooves 221, and the extending direction of each first limiting sliding groove 221 is the front-back direction. The first fixed grid 21 is provided with corresponding first limiting columns 211, the extending direction of the first limiting column 211 is perpendicular to the main body of the first fixed grid 21, and the number of the first limiting column 211 is consistent with the number of the first limiting sliding groove 221. Similarly, one of the second fixed grid 31 and the second movable grid 32 is provided with a second limiting sliding groove 321, and the other is provided with a second limiting column 311 which is slidingly constrained in the second limiting sliding groove 321. The extending direction of the above-mentioned second limiting sliding groove 321 is consistent with the moving direction of the second movable grid 32. Specifically, as shown in the figure, Figure 5 As shown, the second movable grid 32 is provided with a plurality of second limiting sliding grooves 321, and the extending direction of each second limiting sliding groove 321 is the front-back direction. The second fixed grid 31 is provided with corresponding second limiting columns 311, the extending direction of the second limiting column 311 is perpendicular to the main body of the second fixed grid 31, and the number of the second limiting column 311 is consistent with the number of the second limiting sliding groove 321.

[0052] The first movable grille 22 is driven by the first drive mechanism to move back and forth relative to the first fixed grille 21. The second movable grille 32 is driven by the second drive mechanism to move back and forth relative to the second fixed grille 31. Generally, the first drive mechanism for driving the first air intake grille assembly 20 and the second drive mechanism for driving the second air intake grille assembly 30 can be independent drive mechanisms, such as two independent electric push rods. However, in order to reduce the number of drive mechanisms, reduce their space occupation in the housing, and reduce costs, in this embodiment, the first drive mechanism and the second drive mechanism share the same drive component. Specifically, the drive component includes a drive motor 41, the output shaft of which is connected to a transmission shaft 42 extending to the left and right. The transmission shaft 42 can be driven by the drive motor 41 to rotate around its own axis. Both the first fixed grille 21 and the second fixed grille 31 are vertically arranged. The left and right ends of the drive shaft 42 are rotatably supported on the first fixed grille 21 and the second fixed grille 31, respectively. The first fixed grille 21 has a first shaft hole 212 for the first end of the drive shaft 42 to pass through, and the second fixed grille 31 has a second shaft hole 312 for the second end of the drive shaft 42 to pass through. The first end of the drive shaft 42 is connected to the first movable grille 22 via a first connecting rod assembly, and the second end of the drive shaft 42 is connected to the second movable grille 32 via a second connecting rod assembly. The first connecting rod assembly includes a first connecting rod 431 and a second connecting rod 432. The first end of the first connecting rod 431 is connected to the first end of the drive shaft 42 and rotates around the axis of the drive shaft 42 under its drive. The first end of the second connecting rod 432 is rotatably connected to the second end of the first connecting rod 431 (the axes of their relative rotation also extend in the left and right directions), and the second end of the second connecting rod 432 is rotatably connected to the first movable grille 22 (the axes of their relative rotation also extend in the left and right directions). Similarly, the second linkage assembly includes a third linkage 433 and a fourth linkage 434. The first end of the third linkage 433 is connected to the second end of the drive shaft 42 and rotates around the axis of the drive shaft 42 under its drive. The first end of the fourth linkage 434 is rotatably connected to the second end of the third linkage 433 (the axes of their relative rotation also extend in the left-right direction), and the second end of the fourth linkage 434 is rotatably connected to the second movable grille 32 (the axes of their relative rotation also extend in the left-right direction). When the drive motor 41 drives the drive shaft 42 to rotate, the corresponding first and second linkage assemblies can drive the first movable grille 22 and the second movable grille 32 to move back and forth, thereby changing the air intake volume of the first air intake grille assembly 20 and the second air intake grille assembly 30. The aforementioned drive motor 41, drive shaft 42, and first linkage assembly constitute the first drive mechanism of this embodiment. The aforementioned drive motor 41, drive shaft 42, and second linkage assembly constitute the second drive mechanism of this embodiment.

[0053] A support plate 5 extending laterally and connecting the first fixed grille 21 and the second fixed grille 31 is also provided. To ensure overall strength, the first fixed grille 21, the second fixed grille 31, and the support plate 5 can be designed as a single unit.

[0054] The front or rear side of the smoke hood 12 also defines a mounting chamber 123 for housing the drive motor 41 and the drive shaft 42, such as... Figure 4 The installation chamber 123 is located on the rear side of the fume hood 12. The drive motor 41, drive shaft 42 and other components are placed in the installation chamber 123, which can prevent the drive motor 41, drive shaft 42 and other components from coming into contact with oil fumes and being contaminated, thereby improving their service life.

[0055] The total overlapping area of ​​each first air inlet hole 210 and each second air inlet hole 220 on the first air inlet grille assembly is denoted as S1, and the total overlapping area of ​​each third air inlet hole 310 and each fourth air inlet hole 320 on the second air inlet grille assembly is denoted as S2. The first air inlet grille assembly 20 and the second air inlet grille assembly 30, under the drive of the driving member, have at least a first state, a second state, and a third state:

[0056] In the first state, S1 and S2 are the same, and neither S1 nor S2 is zero, such as... Figure 6 The air intake state is shown. The air intake volume of the first air intake grille assembly 20 is the same as that of the second air intake grille assembly 30, which is basically half of the maximum air intake volume of the first air intake grille assembly 20 (or the second air intake grille assembly 30). This is suitable for situations where both the left and right sides are in the cooking state.

[0057] In the second state, S1 is greater than S2, and S2 ≥ 0; in the third state, S2 is less than S1, and S1 ≥ 0. When the intensity of cooking on the left and right sides differs, the system can switch to either the second or third state depending on the actual situation. When S1 = 0 or S2 = 0, it indicates that the air intake grille assembly on one side is closed, meaning that no cooking is being performed on that side.

[0058] The operation of the drive mechanism is as follows: When the drive shaft 42 rotates counterclockwise under the drive of the drive motor 41, the second movable grille 32 on the right side moves backward, and the first movable grille 22 on the left side moves forward. At this time, the ventilation area of ​​the right air intake grille assembly gradually decreases, while the ventilation area of ​​the left air intake grille assembly gradually increases. When it moves to... Figure 7In this state, the right-side air intake grille assembly is completely closed, while the left side is fully open. At this time, the airflow of the first air duct 1211 on the left side reaches its maximum, while the airflow of the second air duct 1212 on the right side is zero. This state is suitable for use when cooking on the left side alone. It is important to note that in order to ensure that the total airflow of the fan does not increase, the sum of the ventilation areas on both sides must remain constant during the translational movement.

Claims

1. An extractor hood, comprising: a fan frame (11); a hood (12) located below the fan frame (11) and having a bottom part with a first air inlet (1201) and a second air inlet (1202) arranged at intervals in left and right directions; characterized in that the hood (12) defines a first air duct (1211) communicating the first air inlet (1201) with an internal space of the fan frame (11) and a second air duct (1212) communicating the second air inlet (1202) with the internal space of the fan frame (11), and that the first air duct (1211) is provided with a first air inlet grille assembly (20) capable of changing the ventilation volume of the first air duct (1211) on a flow path of the first air duct (1211), and the second air duct (1212) is provided with a second air inlet grille assembly (30) capable of changing the ventilation volume of the second air duct (1212) on a flow path of the second air duct (1212).

2. The hood according to claim 1, characterized in that: The first air duct (1211) has a first air outlet (1221) communicating with the internal space of the fan frame (11), and the second air duct (1212) has a second air outlet (1222) communicating with the internal space of the fan frame (11), the first air inlet grille assembly (20) is arranged at the first air outlet (1221), and the second air inlet grille assembly (30) is arranged at the second air outlet (1222).

3. The extractor hood according to claim 2, characterized in that: the first air inlet grille assembly (20) comprises: a first fixed grille (21) having first air inlet holes (210) distributed thereon; a first movable grille (22) arranged on the upstream side or the downstream side of the first fixed grille (21) and having second air inlet holes (220) distributed thereon, the first movable grille (22) being capable of being driven by a first driving mechanism to move relative to the first fixed grille (21) along the extension direction of the first fixed grille (21) so as to change the overlapping area of the first air inlet holes (210) on the first fixed grille (21) and the second air inlet holes (220) on the first movable grille (22); the second air inlet grille assembly (30) comprises: a second fixed grille (31) having third air inlet holes (310) distributed thereon; a second movable grille (32) arranged on the upstream side or the downstream side of the second fixed grille (31) and having fourth air inlet holes (320) distributed thereon, the second movable grille (32) being capable of being driven by a second driving mechanism to move relative to the second fixed grille (31) along the extension direction of the second fixed grille (31) so as to change the overlapping area of the third air inlet holes (310) on the second fixed grille (31) and the fourth air inlet holes (320) on the second movable grille (32).

4. The hood according to claim 3, characterized in that: One of the first fixed grille (21) and the first movable grille (22) is provided with a first limiting sliding groove (221), and the other is provided with a first limiting column (211) slidingly constrained in the first limiting sliding groove (221), and the extension direction of the first limiting sliding groove (221) is consistent with the moving direction of the first movable grille (22). One of the second fixed grid (31) and the second movable grid (32) is provided with a second limiting sliding groove (321), and the other is provided with a second limiting column (311) slidingly constrained in the second limiting sliding groove (321), and the extending direction of the second limiting sliding groove (321) is consistent with the moving direction of the second movable grid (32).

5. The hood according to claim 3, characterized in that: Each of the first air inlet holes (210) on the first fixed grid (21) and the second air inlet holes (220) on the first movable grid (22) is a strip-shaped hole, and the extending direction of each strip-shaped hole is perpendicular to the moving direction of the first movable grid (22). Each of the third air inlet holes (310) on the second fixed grid (31) and the fourth air inlet holes (320) on the second movable grid (32) is a strip-shaped hole, and the extending direction of each strip-shaped hole is perpendicular to the moving direction of the second movable grid (32).

6. The hood according to claim 3, characterized in that: The first air outlet (1221) of the first air duct (1211) and the second air outlet (1222) of the second air duct (1212) are both strip-shaped openings extending in the front-rear direction, and the first air outlet (1221) and the second air outlet (1222) are opposite in the left-right direction, and the moving direction of the first movable grid and the moving direction of the second movable grid are both front-rear directions.

7. The hood according to claim 6, characterized in that: The total area of the overlap of each first air inlet hole (210) and each second air inlet hole (220) on the first air inlet grid assembly is denoted as S1, the total area of the overlap of each third air inlet hole (310) and each fourth air inlet hole (320) on the second air inlet grid assembly is denoted as S2, the first driving mechanism and the second driving mechanism share the same driving member, and the first air inlet grid assembly (20) and the second air inlet grid assembly (30) driven by the driving member have at least first, second and third states: In the first state, S1 and S2 are the same, and S1 and S2 are both not zero; In the second state, S1 is greater than S2, and S2 is greater than or equal to zero; In the third state, S2 is less than S1, and S1 is greater than or equal to zero.

8. The hood according to claim 7, characterized in that: The driving member includes a driving motor (41), and the output shaft of the driving motor (41) is connected with a left-right extending transmission shaft (42), the transmission shaft (42) can be rotated around its axis by the driving motor (41), the first end of the transmission shaft (42) is connected with the first movable grid (22) through a first connecting rod assembly, and the second end of the transmission shaft (42) is connected with the second movable grid (32) through a second connecting rod assembly.

9. The hood according to claim 8, characterized in that: The first connecting rod assembly includes a first connecting rod (431) and a second connecting rod (432), the first end of the first connecting rod (431) is connected with the first end of the transmission shaft (42) and rotates around the axis of the transmission shaft (42) under the driving of the transmission shaft (42), the first end of the second connecting rod (432) is rotationally connected with the second end of the first connecting rod (431), and the second end of the second connecting rod (432) is rotationally connected with the first movable grid (22); The second connecting rod assembly comprises a third connecting rod (433) and a fourth connecting rod (434), the first end of the third connecting rod (433) is connected with the second end of the transmission shaft (42) and rotates around the axis of the transmission shaft (42) under the driving of the transmission shaft (42), the first end of the fourth connecting rod (434) is rotatably connected with the second end of the third connecting rod (433), and the second end of the fourth connecting rod (434) is rotatably connected with the second movable grid (32); The driving motor (41), the transmission shaft (42) and the first connecting rod assembly constitute the first driving mechanism, and the driving motor (41), the transmission shaft (42) and the second connecting rod assembly constitute the second driving mechanism.

10. The hood according to claim 9, characterized in that: The left and right ends of the transmission shaft (42) are rotatably supported on the first fixed grid (21) and the second fixed grid (31), respectively, the first fixed grid (21) is provided with a first shaft hole (212) through which the first end of the transmission shaft (42) passes, and the second fixed grid (31) is provided with a second shaft hole (312) through which the second end of the transmission shaft (42) passes.

11. The hood according to claim 10, characterized in that: The front side or the rear side of the smoke collecting cover (12) further defines a mounting cavity (123) for placing the driving motor (41) and the transmission shaft (42).

12. The hood according to any one of claims 1-11, characterized in that: The bottom of the smoke collecting cover (12) further has a main suction port (120) located between the first suction port (1201) and the second suction port (1202), the main suction port (120) is located directly below the fan frame (11), and an oil screen (124) is arranged at the main suction port (120).

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