A range hood

Abstract

The application discloses a kind of range hood, including air inlet component and for setting fan system upper box, the bottom of the upper box is equipped with air inlet, the air inlet component includes: lower box, the lower box has by the bottom of upper box downwardly extending backboard;Smoke board piece, including baffle and smoke baffle, the length of the baffle is L1, the length of the smoke baffle is L2, the baffle and smoke baffle have closed state and open state: when closed state, the baffle closes air inlet, the smoke baffle covers on the front of backboard, the total height of the smoke board piece is H1;When open state, the baffle opens air inlet, the smoke baffle and baffle jointly form smoke chamber between the front of backboard, the smoke chamber is communicated with upper box interior by air inlet, the total height of the smoke board piece is H2, H2=L1cos α+L2cos β, wherein α is the angle of baffle relative to backboard, β is the angle of smoke baffle relative to backboard, and satisfy the following relationship: 0.8H1

Description

[0001] This invention claims priority to Chinese Patent Application No. 202211324451.1, filed on October 27, 2022, entitled "A Range Hood". Technical Field

[0002] This invention relates to an oil fume purification device, and more particularly to an oil fume extractor. Background Technology

[0003] Range hoods have become an indispensable kitchen appliance in modern homes. They operate on the principles of fluid dynamics, using a centrifugal fan inside to draw in cooking fumes and a filter to remove some grease particles. The centrifugal fan consists of a casing, an impeller housed within the casing, and a motor that drives the impeller. As the impeller rotates, a negative pressure is generated at the center of the fan, drawing in the cooking fumes from below. After being accelerated by the fan, the fumes are collected by the casing and guided outdoors.

[0004] Due to limited kitchen space, a slim range hood has been developed to improve space utilization. For example, Chinese Patent Application No. 202021790417.X discloses a novel range hood comprising: a main unit, including a main unit housing and a fan disposed within the main unit housing; a smoke extraction device disposed below the main unit, including a smoke inlet surface, wherein the fan, when operating, draws fumes from above the stove into the smoke extraction device through the smoke inlet surface; and a smoke baffle, rotatably connected to the smoke inlet surface, used to prevent fumes from above the stove from escaping when rotated to a certain angle; and another example is application number... Chinese Patent No. 202020358616.7 discloses a novel range hood comprising: a main unit, including a main unit housing and a fan disposed within the main unit housing; an upper body disposed below the main unit, with an upper air inlet at the bottom of the upper body; and a lower body disposed below the upper body, the upper and lower bodies forming an inverted L-shape, with the interior of the lower body communicating with the interior of the upper body; a lower air inlet disposed on the lower body, with a main smoke baffle disposed on the side of the lower air inlet facing away from the lower body; the first side of the main smoke baffle is disposed above the lower air inlet via a pivot, and the main smoke baffle can rotate around the pivot.

[0005] As can be seen from the above, in existing thin range hoods, when the baffle is rotated to the open position, its lower edge is relatively high, and the smoke collection area is relatively high, which easily leads to the escape of oil fumes and the smoke extraction effect is not ideal. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a range hood in which the negative pressure zone moves downward during operation, thereby improving the smoke extraction effect.

[0007] The technical solution adopted by the present invention to solve the above technical problems is as follows: An oil fume extractor includes an air inlet component and an upper box body for arranging a fan system. An air inlet is provided at the bottom of the upper box body. The characteristics are as follows: The air inlet component includes:

[0008] A lower box body, which has a back plate extending downward from the bottom of the upper box body;

[0009] A smoke collecting plate member, including a baffle and a smoke baffle. The length of the baffle is L1, and the length of the smoke baffle is L2. The baffle and the smoke baffle have a closed state and an open state:

[0010] In the closed state, the baffle closes the air inlet, the smoke baffle covers the front of the back plate, and the total height of the smoke collecting plate member is H1;

[0011] In the open state, the baffle opens the air inlet, and a smoke collecting cavity is formed between the smoke baffle and the baffle together with the front of the back plate. The smoke collecting cavity is connected to the inside of the upper box body through the air inlet. The total height of the smoke collecting plate member is H2, and H2 = L1cosα + L2cosβ, where α is the included angle of the baffle relative to the back plate, and β is the included angle of the smoke baffle relative to the back plate, and the following relationship is satisfied: 0.8H1 < H2 ≤ 1.1H1.

[0012] By providing the smoke baffle and the baffle, it is possible to close the air inlet in the shutdown state and open the air inlet in the working state. At the same time, when the air inlet is opened, the smoke baffle and the baffle can be unfolded to form a smoke collecting cavity together with the back plate. Compared with the solution of forming a smoke collecting cavity only through the smoke baffle (the height difference of the smoke baffle when it is opened and closed is relatively large. When it is opened, due to the flipping of the smoke baffle, the lower edge of the smoke baffle rises, so the negative pressure area is relatively high, which easily causes the oil fume to escape during the rising process and affects the oil fume extraction effect), this way of the present invention can make the combination of the smoke collecting plate member composed of the smoke baffle and the baffle have a smaller height difference when it is opened and closed, and the negative pressure area can be maintained at a lower position, and even can be lower when it is opened than when it is closed, thus being closer to the smoke source and improving the oil fume extraction effect.

[0013] Preferably, the above height satisfies the following relationship: 0.85H1 < H2 ≤ H1, thereby ensuring the decrease of the negative pressure area while better avoiding the lower edge of the smoke baffle from blocking the line of sight.

[0014] Preferably, the value range of α is less than 55°, less than 50° or less than 45° to avoid the opening angle being too large and blocking the line of sight.

[0015] Preferably, the value range of β is less than 55°, less than 50° or less than 45° to avoid the opening angle being too large and blocking the line of sight.

[0016] Preferably, the included angle satisfies the following relationship: β≥α, to ensure smooth air intake, prevent oil fumes from impacting the connection between the baffle and the smoke baffle and forming a vortex, and better guide them into the upper box through the air inlet.

[0017] Preferably, the above lengths satisfy the following relationship: the value range of L1:L2 is 1:4 to 1:1.5. Under the premise that the opening of the baffle and the smoke baffle does not affect cooking, the total height of the two plates is basically limited. When this ratio continues to increase, the smoke baffle will be closer to the user's face after opening, affecting the user experience and possibly obstructing the view. Although a larger L2 can make the lower end of the smoke baffle lower and the negative pressure zone lower, which is conducive to improving the oil fume extraction effect, the risk of hitting the pan will increase. If the ratio is too small, the width of the air inlet is small, affecting the smoothness of air intake.

[0018] Preferably, the thickness of the lower housing portion corresponding to the back plate does not exceed 50mm.

[0019] Furthermore, the lower housing has a recessed portion on one side corresponding to the smoke-collecting plate, which forms part of the smoke-collecting cavity, thereby further expanding the range of the smoke-collecting cavity.

[0020] Furthermore, the baffle can be rotatably opened and closed. The smoke baffle is rotatably connected to the baffle. Through the rotatable connection between the baffle and the smoke baffle, the smoke collecting plate reduces its depth in the front and rear directions when the air inlet is closed. In the open state, the baffle can be used to extend the length of the smoke baffle, that is, to expand the smoke collecting area and improve the oil fume extraction effect.

[0021] To achieve the maximum air intake area and smoke collection area, the baffle is rotatably connected to the upper or lower housing at the front side or near the front side of the air inlet. The upper end of the smoke baffle is connected to the free end of the baffle. The free end of the baffle covers the air inlet when the baffle is in the closed air inlet state.

[0022] Furthermore, the range hood also includes a motion mechanism for driving the smoke baffle and the baffle to move together. The motion mechanism includes a rotation drive module and a connecting rod driven by the rotation drive module to rotate. One end of the connecting rod is rotatably connected to the upper housing, and the other end of the connecting rod is fixed to the smoke baffle, thereby simplifying the motion mechanism.

[0023] Furthermore, in order to maximize the effect of the baffle on the length of the smoke baffle and maximize the smoke collection area, the left and right sides of the baffle are provided with sliding grooves, and the lower or upper box is provided with a rotating shaft, which is fitted into the sliding groove.

[0024] Preferably, to reduce the escape of oil fumes from the left and right sides, the lower box also includes a side plate and a top plate. The top plate is formed by extending forward from the top of the back plate. The width of the back plate is greater than the width of the upper box. The top plate is located on the left and right sides of the upper box. The side plates are arranged on the left and right sides of the top plate and the back plate. The pivot is arranged on the side plate.

[0025] Compared with the prior art, the advantages of the present invention are as follows: (The height difference between the smoke baffle and the open and closed is large. When the smoke baffle is open, the lower edge of the smoke baffle rises due to the flipping of the smoke baffle, so the negative pressure zone is relatively high, which easily causes the oil fumes to escape during the rising process and affects the oil fume absorption effect.) The method of the present invention can make the height difference between the open and closed of the smoke baffle and the baffle-shaped smoke collection plate combination smaller, and the negative pressure zone can be kept at a lower position, or even lower when open than when closed, thereby getting closer to the smoke source and improving the oil fume absorption effect. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the closed state of the range hood according to the first embodiment of the present invention;

[0027] Figure 2 for Figure 1 A cross-sectional view of a range hood;

[0028] Figure 3 for Figure 2 A magnified schematic diagram of part I;

[0029] Figure 4 for Figure 1 A schematic diagram of the smoke baffle, baffle and its moving mechanism of a range hood;

[0030] Figure 5 This is a schematic diagram of the open intermediate state of the range hood according to the first embodiment of the present invention;

[0031] Figure 6 for Figure 5 A cross-sectional view of a range hood;

[0032] Figure 7 This is a schematic diagram of the range hood in the open state according to the first embodiment of the present invention;

[0033] Figure 8 for Figure 7 A cross-sectional view of a range hood;

[0034] Figure 9 This is a schematic diagram of the smoke baffle, baffle and its moving mechanism of the range hood according to the second embodiment of the present invention;

[0035] Figure 10 This is a schematic diagram of the smoke baffle, baffle and its moving mechanism of the range hood according to the third embodiment of the present invention. Detailed Implementation

[0036] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0038] Example 1

[0039] See Figures 1-6 A range hood includes an air intake assembly 1 and an upper housing 2, wherein a fan system 3 is housed within the upper housing 2. In the installed state, the upper housing 2 is concealed within a kitchen cabinet, with its bottom surface flush with the cabinet, except for the air intake assembly 1 which protrudes below the cabinet. Alternatively, the fan system 3 can be housed in another housing connected to the upper housing 2.

[0040] The air intake assembly 1 includes a lower housing 11, a smoke baffle 12, and a baffle 13. The smoke baffle 12 and the baffle 13 constitute a smoke collection plate. An air inlet 21 is preferably provided at the bottom of the upper housing 2, near the rear end, and extends in the left-right direction. The fan system 3 is located near the front of the upper housing 2. A filter 5 is provided inside the upper housing 2. The filter 5 is located above the air inlet 21 and extends forward beyond the air inlet 21. The filter 5 gradually slopes downward from front to back. The filter 5 is closed at the position corresponding to the fan system 3 without mesh openings. The structure and arrangement of the filter 5 can prevent oil droplets from flying out during operation, and at the same time guide the condensed oil in the fan system 3 to the rear side, and collect it in the oil cup 6 located at the bottom of the lower housing 11.

[0041] The lower housing 11 includes a back panel 111, side panels 112, and a top panel 113. The back panel 111 is located below the rear side of the upper housing 2, extending downward from the lower end of the upper housing 2. The top panel 113 is formed by extending forward from the top of the back panel 111. The bottom panel 114, back panel 111, and top panel 113 can be independent panels or integral panels. The top panel 113 can be gradually inclined downward from front to back. The width (left-right dimension) of the back panel 111 is greater than the width of the upper housing 2. The top panel 113 is located on the left and right sides of the upper housing 2. Preferably, the top panel 113 is close to the lower end of the upper housing 2. The side panels 112 are provided on the left and right sides of the top panel 113. Alternatively, the side panels 112 can be provided on the left and right sides of the back panel 111 or on the left and right sides of the smoke baffle 12. The lower housing 11 has a recessed portion 114 on one side corresponding to the smoke-collecting plate, and this recessed portion 114 is shaped to be recessed away from the smoke baffle 12. The thickness of the portion of the lower housing 11 corresponding to the back plate 111 is h2, and h2 does not exceed 50mm. Alternatively, the width of the back plate 111 can be equal to the width of the upper housing 2. In this case, there is no need to provide a top plate 113, and side plates 112 can still be provided on the left and right sides of the back plate 111 or the left and right sides of the smoke baffle 12.

[0042] A smoke baffle 12 is rotatably mounted on the front side of the back panel 111. Its upper end or near the upper end is used for connection, while its lower end is a free end. The axis of rotation extends in the left-right direction, and it serves to collect smoke when open. A baffle 13 is rotatably mounted at the air inlet 21, and its axis of rotation extends in the left-right direction to open and close the air inlet 21. The baffle 13 is rotatably connected to the front side or near the front side of the air inlet 21, and the upper end of the smoke baffle 12 is connected to the free end (the rear end in the closed state) of the baffle 13. When the baffle 13 closes the air inlet 21, it simultaneously closes both the front and rear ends of the top panel 113.

[0043] The smoke baffle 12 and baffle 13 can move independently or in conjunction. In this embodiment, the smoke baffle 12 and baffle 13 move in conjunction. Therefore, the range hood also includes a motion mechanism for driving the smoke baffle 12 and baffle 13 in conjunction. The motion mechanism includes a drive mechanism 41 and a transmission mechanism. The drive mechanism 41 is preferably an electric push rod. The transmission mechanism includes a connecting rod 421. One end of the connecting rod 421 is rotatably connected to the inside of the upper housing 2, and the other end of the connecting rod 421 is fixed to the smoke baffle 12. The electric push rod (excluding the push rod used for output) is rotatably connected to the upper housing 2, and the push rod of the electric push rod is rotatably connected to the portion between the two ends of the connecting rod 421. The rotation axis of the connecting rod 421 extends in the left-right direction. The position where the connecting rod 421 connects to the upper housing 2 is the rotation center of the smoke baffle 12. The connecting rod 421 is curved and protrudes backward, thereby avoiding interference with the baffle 13 during movement. The above-mentioned rotatable electric push rod constitutes a rotation drive module.

[0044] The components of the aforementioned motion mechanism constitute the driving end of the motion mechanism, which also includes a driven end, which only has a transmission mechanism. The driving end and the driven end are respectively connected to positions arranged at intervals on the left and right sides of the smoke baffle 12.

[0045] The rear end of the baffle 13 is rotatably connected to the upper end of the smoke baffle 12, with the axis of rotation extending in the left-right direction. Slide grooves 131 are provided on both the left and right sides of the baffle 13, and a rotating shaft 132 is provided on the side plate 112 to cooperate with the slide grooves 131. The rotating shaft 132 can also rotate relative to the slide grooves 131. When the widths of the back plate 111 and the upper housing 2 are the same, the rotating shaft 132 can be located inside the upper housing 2. That is, the baffle 13 is rotatably mounted relative to the upper housing 2.

[0046] See Figure 1 and Figure 2 At this time, the range hood is in the off state. The baffle 13 closes the air inlet 11, and the free end of the baffle 13 covers the air inlet 21. The smoke baffle 12 is located in front of the back panel 111, covering the front of the back panel 111 in a roughly vertical position, allowing it to fit snugly against the back panel 111. Both the smoke baffle 12 and the baffle 13 are folded. The depth (dimension in the front-to-back direction) of the air inlet 21 is greater than the distance between the upper end of the back panel 111 and the upper end of the smoke baffle 12. This ensures a large air intake area when the air inlet 21 is open, even with a thin lower housing 11. In this state, the total height (vertical dimension) of the smoke collection components (baffle 13 and smoke baffle 12) is H1.

[0047] See Figure 5 and Figure 6 The drive mechanism 41 pushes the connecting rod 421 around Figure 6 The counterclockwise rotation shown pushes the smoke baffle 12 outward and flips it, thereby causing the baffle 13 to rotate. The movement trajectory of the baffle 13 is also limited by the cooperation of the rotating shaft 132 and the slide groove 131.

[0048] See Figure 7 and Figure 8 When the smoke baffle 12 is opened to its limit, the baffle 13 and the smoke baffle 12 are in an unfolded state, almost on the same plane. The baffle 13 and the smoke baffle 12 together form a smoke-collecting plate, which lengthens the original smoke baffle 12, allowing for a larger smoke-collecting range. At this time, the smoke baffle 12 is located in front of the position when closed. The smoke baffle 12 and the baffle 13 together form a smoke-collecting cavity Q with the front of the back plate 111. The concave part 114 also forms part of the smoke-collecting cavity Q. The smoke-collecting cavity Q is connected to the interior of the upper box 2 through the air inlet 21. The fumes enter the upper box 2 from the rear side of the smoke baffle 12 and the baffle 13 through the air inlet 21.

[0049] By setting the smoke baffle 12 and baffle 13, the air inlet 21 can be closed in the off state and opened in the working state. In the open state, the smoke baffle 12 and baffle 13 unfold and together form a smoke collecting chamber with the back plate 111. Compared with the scheme that only forms a smoke collecting chamber by the smoke baffle 12 (the height difference of the smoke baffle when it is open and closed is large. When it is open, the lower edge of the smoke baffle rises due to the flipping of the smoke baffle, so the negative pressure zone is relatively high, which can easily cause the oil fumes to escape during the rising process and affect the oil fume absorption effect), the method of the present invention can make the smoke collecting plate combination composed of the smoke baffle 12 and baffle 13 have a smaller height difference when it is open and closed, and the negative pressure zone can be kept at a lower position, or even lower when it is open than when it is closed, thereby getting closer to the smoke source and improving the oil fume absorption effect.

[0050] The length of the baffle 13 is L1, and the length of the smoke baffle 12 is L2. The ratio of L1 to L2 ranges from 1:4 to 1:1.5, which basically limits the total height of the baffle and smoke baffle without affecting cooking when they are open. If this ratio is increased further, the smoke baffle will be too close to the user's face when it is open, affecting the user experience and possibly obstructing the view. Although a larger L2 can make the lower end of the smoke baffle lower, and the negative pressure zone will also drop lower, which is beneficial to improving the smoke extraction effect, the risk of the pan hitting the food will increase. On the other hand, if the ratio is too small, the air inlet width will be small, affecting the smoothness of air intake.

[0051] In the open state, the total height (vertical dimension) of the smoke-collecting plate is H2, where H2 = L1cosα + L2cosβ, where α is the angle between the baffle 13 and the back plate 111 (the back plate 111 is in a vertical state when the range hood is normally installed), and β is the angle between the smoke baffle 12 and the back plate 111. Preferably, the following relationship is satisfied: 0.8H1 < H2 ≤ 1.1H1, which lowers the negative pressure zone and improves the smoke extraction effect. More preferably, 0.85H1 < H2 ≤ H1, which ensures that the negative pressure zone is lowered while better preventing the smoke baffle 12 from obstructing the view. The preferred values ​​for α are less than 55°, less than 50°, or less than 45°; the preferred values ​​for β are less than 55°, less than 50°, or less than 45°, to avoid the opening angle being too large and obstructing the view. The preferred included angle satisfies the following relationship: β≥α, to ensure smooth air intake, prevent oil fumes from impacting the connection between the baffle 13 and the smoke baffle 12 and forming a vortex, and better guide them into the upper housing 2 through the air inlet 21.

[0052] This embodiment achieves both an extremely thin profile in the off state and a large air intake channel and a large smoke collection range in the working state by folding and unfolding the baffle 13 at the air inlet of the range hood relative to the smoke baffle 12. This design also eliminates the need for the air intake assembly 1 to form an air intake channel. When closed, the smoke baffle 12 can be close to the back panel 111, making the overall thickness of the air intake assembly 1 extremely thin, preferably around ten millimeters.

[0053] Example 2

[0054] See Figure 9 In this embodiment, the difference from Embodiment 1 is that the drive mechanism 41 uses a motor, and the transmission mechanism further includes a gear 422 and a rack 423. The gear 422 is connected to the output shaft of the motor and can rotate around a left-right extending axis. The gear 422 and the rack 423 mesh, and the rack 423 is fan-shaped with its teeth formed on the arc surface of the fan shape. The rack 423 is fixed to the connecting rod 421. The motor, gear 422, and rack 423 constitute a rotation drive module.

[0055] Therefore, when the motor starts, the rack 423 can be driven to rotate by the gear 422, which in turn drives the connecting rod 421 to rotate.

[0056] Example 3

[0057] See Figure 10 In this embodiment, the difference from the second embodiment is that the connecting rod 421 is directly connected to the output shaft of the motor and is directly driven to rotate by the motor.

Claims

1. A range hood, comprising an air inlet assembly (1) and an upper housing (2) for housing a fan system, wherein the bottom of the upper housing (2) is provided with an air inlet (21) near the rear end, characterized in that: The air intake assembly (1) includes: The lower housing (11) has a back plate (111) extending downward from the bottom of the upper housing (2); A smoke-collecting plate includes a baffle (13) and a smoke-blocking plate (12), wherein the length of the baffle (13) is L1 and the length of the smoke-blocking plate (12) is L2, and the baffle (13) and the smoke-blocking plate (12) have a closed state and an open state. When closed, the baffle (13) closes the air inlet (21), the smoke baffle (12) covers the front of the back plate (111), and the total height of the smoke baffle is H1; When in the open state, the baffle (13) opens the air inlet (21), and the smoke baffle (12) and the baffle (13) together form a smoke collection cavity (Q) with the front of the back plate (111). The smoke collection cavity (Q) is connected to the interior of the upper box (2) through the air inlet (21). The total height of the smoke collection plate is H2, H2=L1cosα+L2cosβ, where α is the angle between the baffle (13) and the back plate (111), β is the angle between the smoke baffle (12) and the back plate (111), and satisfies the following relationship: 0.8H1<H2≤1.1H1.

2. The range hood according to claim 1, characterized in that: The above heights satisfy the following relationship: 0.85H1<H2≤H1.

3. The range hood according to claim 1, characterized in that: The value of α is less than 55°, less than 50°, or less than 45°.

4. The range hood according to claim 1, characterized in that: The value of β can be less than 55°, less than 50°, or less than 45°.

5. The range hood according to any one of claims 1 to 4, characterized in that: The included angles satisfy the following relationship: β≥α.

6. The range hood according to claim 1, characterized in that: The above lengths satisfy the following relationship: the value range of L1:L2 is 1:4 to 1:1.

5.

7. The range hood according to claim 1, characterized in that: The thickness (h2) of the lower housing (11) portion corresponding to the back plate (111) does not exceed 50 mm.

8. The range hood according to claim 7, characterized in that: The lower housing (11) has a recess (114) on one side corresponding to the smoke collecting plate, and the recess (114) forms part of the smoke collecting cavity (Q).

9. The range hood according to claim 1, characterized in that: The baffle (13) can be rotatably opened and closed to the air inlet (21), and the smoke baffle (12) is rotatably connected to the baffle (13).

10. The range hood according to claim 9, characterized in that: The baffle (13) is rotatably connected to the upper box (2) or the lower box (11) at a position in front of or near the air inlet (21). The upper end of the smoke baffle (12) is connected to the free end of the baffle (13). The free end of the baffle (13) covers the air inlet (21) when the baffle (13) closes the air inlet (21).

11. The range hood according to claim 10, characterized in that: The range hood also includes a motion mechanism for driving the smoke baffle (12) and the baffle (13) to move together. The motion mechanism includes a rotation drive module and a connecting rod (421) driven to rotate by the rotation drive module. One end of the connecting rod (421) is rotatably connected to the upper housing (2), and the other end of the connecting rod (421) is fixed to the smoke baffle (12).

12. The range hood according to claim 11, characterized in that: The baffle (13) has sliding grooves (131) on its left and right sides, and a rotating shaft (132) is provided in the lower box (11) or the upper box (2), and the rotating shaft (132) is fitted in the sliding groove (131).

13. The range hood according to claim 12, characterized in that: The lower housing (11) also includes a side plate (112) and a top plate (113). The top plate (113) is formed by extending forward from the top of the back plate (111). The width of the back plate (111) is greater than the width of the upper housing (2). The top plate (113) is located on the left and right sides of the upper housing (2). The side plate (112) is arranged on the left and right sides of the top plate (113) and the back plate (111). The pivot (132) is arranged on the side plate (112).

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