Range hood

Abstract

The invention discloses a range hood which comprises an upper box body, a lower box body and a lower box body, the air inlet assembly comprises a lower box body and a smoke baffle capable of rotating relative to the lower box body, and the lower box body is connected to the lower portion of the upper box body; the range hood is characterized in that the smoke baffle performs fixed-axis rotation and is provided with a rotation center; the air inlet assembly further comprises a baffle capable of opening and closing the air inlet, and the baffle is connected with the smoke baffle. When the range hood is in a closed state, the air inlet is closed, and the smoke baffle covers the front surface of the lower box body; when the range hood is in an open state, the baffle rotates relative to the upper box body to open the air inlet, the smoke baffle is pushed forwards to form a smoke gathering cavity with the lower box body, the smoke gathering cavity can be communicated with fluid in the upper box body through the air inlet, and the rotating center of the smoke baffle is higher than the top end of the smoke baffle in the state.

Description

[0001] This invention claims priority to the following Chinese patent applications: 1. The application number is 202211324451.1, the application date is October 27, 2022, and the invention title is "A Range Hood"; 2. The application number is 202211324487.X, the application date is October 27, 2022, and the invention title is "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 thin range hood has been developed to improve space utilization. For example, Chinese Patent Application No. 201420538159.4 discloses a novel ultra-thin range hood with a fan box and a fume extraction chamber. The fume extraction chamber is located directly below and connected to the fan box, and is flush against the wall. The front panel of the fume extraction chamber gradually slopes towards the wall from top to bottom. Another example is Patent Application No. 2018207758. Chinese Patent No. 51.7 discloses an ultra-thin bottom-suction range hood, including a blower box and a smoke collection hood. The smoke collection hood is located directly below the blower box and is connected to the blower box. The blower box is a three-dimensional columnar cabinet shape, and the smoke collection hood is a rectangular flat plate with a hollow interior, the width of which is greater than its height. The lower side of the smoke collection hood has a hidden air inlet along its long edge. The smoke collection hood is equipped with a smoke guide plate, which is located directly above the hidden air inlet. The smoke guide plate forms an angle of 45°-60° with the front wall of the smoke collection hood cavity.

[0005] As can be seen from the above, existing thin range hoods, whether they are designed to draw air from the front to form a near-suction type or from the bottom to form a low-suction type, must retain an air intake channel against the wall. In order to ensure the smoke extraction effect, the air intake channel should not be too small, resulting in the exposed part of the range hood still having a large thickness. 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 that, while ensuring the smoke extraction effect, reduces the space occupied by the exposed parts of the range hood and improves the space utilization rate.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a range hood, comprising: The upper housing has an air inlet on its bottom surface; and An air intake assembly includes a lower housing and a smoke baffle that can rotate relative to the lower housing, the lower housing being connected below the upper housing; Its features are: The smoke baffle rotates on a fixed axis and has a center of rotation; The air intake assembly also includes a baffle that can open and close the air intake, and the baffle is connected to the smoke baffle. When the range hood is in the off state, the air inlet is closed and the smoke baffle covers the front of the lower housing; When the range hood is in the open state, the baffle rotates relative to the upper housing to open the air inlet, and the smoke baffle is pushed forward to form a smoke collection chamber between itself and the lower housing. The smoke collection chamber can be fluidly connected to the upper housing through the air inlet, and the rotation center of the smoke baffle is higher than the top of the smoke baffle in this state.

[0008] By setting up a baffle, the air inlet on the bottom surface of the upper housing is opened when the machine is in operation. The baffle can rotate forward and form a smoke-collecting chamber between itself and the lower housing, expanding the smoke-collecting area. This, combined with the opened air inlet, ensures a good smoke extraction effect. When the machine is turned off, the air inlet is closed and the baffle moves backward, achieving an extremely thin profile and reducing the space occupied by the exposed parts of the range hood, thus improving space utilization. The rotation center of the baffle is higher than the top of the baffle when it is open. Therefore, the movement trajectory of the baffle when it opens is forward (i.e., flipping outward) and pushing forward. The connection between the baffle and the smoke baffle not only makes the baffle and the smoke baffle move together, but also allows them to rotate in the same direction due to the connection, thus opening the air inlet.

[0009] Furthermore, the upper housing is equipped with a fan system and a filter screen located below the fan system. The filter screen is located above the air inlet and extends forward beyond the air inlet. By setting up the filter screen, oil fumes can be filtered before entering the fan system, thus extending the service life of the fan system.

[0010] Preferably, the filter screen gradually slopes downwards from front to back, and the filter screen is closed at the position corresponding to the fan system. This facilitates the backward flow of oil on the filter screen for collection, while preventing oil from the fan system from dripping directly through the filter screen.

[0011] Furthermore, the lower housing includes a back panel and a top panel. The back panel is located below the rear of the upper housing, and the top panel extends forward from the top of the back panel, located on the left and right sides of the upper housing. Therefore, there is no need to form a fixed internal cavity for the air intake channel within the lower housing, thus preventing noise during air intake due to an insufficiently thick air intake channel. The lower housing primarily serves to collect smoke, allowing it to be made thinner.

[0012] Furthermore, the smoke baffle is rotatably mounted on the front side of the back plate, thereby cooperating with the back plate to collect smoke.

[0013] Preferably, to further ensure that the smoke baffle and the baffle rotate in the same direction, and at the same time ensure sufficient smoke collection length, the upper end of the smoke baffle or a position near the upper end is connected to the baffle.

[0014] Preferably, the rotation center of the smoke baffle is located on the upper housing.

[0015] Furthermore, this simplifies the motion mechanism. The range hood also includes a motion mechanism for driving the smoke baffle. The motion mechanism includes a drive mechanism and a transmission mechanism. The drive mechanism is a rotary drive module. The transmission mechanism includes a connecting rod driven to rotate by the rotary drive module. One end of the connecting rod is rotatably connected to the inner side of the upper housing, and the center of the rotatable connection is the rotation center of the smoke baffle. The other end of the connecting rod is fixed to the smoke baffle. The rotation axis of the connecting rod extends in the left-right direction.

[0016] Furthermore, the range hood also includes a first motion mechanism for driving the smoke baffle and the baffle to move together. The first motion mechanism includes a rotation drive module and a connecting rod driven to rotate by the rotation drive module. 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.

[0017] Compared with the prior art, the advantages of the present invention are as follows: By setting a baffle, the air inlet on the bottom surface of the upper box is opened in the working state. The smoke baffle can form a smoke-gathering chamber between itself and the lower box after rotating forward, expanding the smoke-gathering area. In conjunction with the opened air inlet, it ensures a good smoke extraction effect. When the machine is turned off, the air inlet is closed and the smoke baffle moves backward, which can achieve an extremely thin profile, reduce the space occupied by the exposed part of the range hood, and improve space utilization. The rotation center of the smoke baffle is higher than the top of the smoke baffle in the open state. Therefore, the movement trajectory of the smoke baffle when it opens is forward (i.e., flipped outward) and pushed forward. The connection between the baffle and the smoke baffle not only makes the baffle and the smoke baffle move in tandem, but also allows them to rotate in the same direction due to the connection, so as to open the air inlet. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the closed state of the range hood according to the first embodiment of the present invention; Figure 2 for Figure 1 A cross-sectional view of a range hood; Figure 3 for Figure 2 A magnified schematic diagram of part I; Figure 4 for Figure 1 A schematic diagram of the smoke baffle, baffle and its moving mechanism of a range hood; 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; Figure 6 for Figure 5 A cross-sectional view of a range hood; Figure 7 This is a schematic diagram of the range hood in the open state according to the first embodiment of the present invention; Figure 8 for Figure 7 A cross-sectional view of a range hood; 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; 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

[0019] 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.

[0020] 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. Example 1

[0021] 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.

[0022] 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.

[0023] The lower housing 11 includes a back panel 111, a first side panel 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 back panel 111, the first side panel 112, and the 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 first side panels 112 are provided on the left and right sides of the top panel 113. Alternatively, the first 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. See also Figure 8 The depth h1 (dimension in the front-to-back direction) of the air inlet 21 is greater than the thickness h2 of the lower housing 11 part corresponding to the back panel 111, and h2 does not exceed 50mm.

[0024] The lower housing 11 forms a recessed portion 114 on one side corresponding to the smoke-collecting plate, and the recessed portion 114 is shaped to be recessed away from the smoke baffle 12. 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 the first 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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 that mates with the slide grooves 131 is provided on the first side plate 112. 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 positioned inside the upper housing 2. That is, the baffle 13 is rotatably positioned relative to the upper housing 2.

[0029] See Figure 1 and Figure 2 At this time, the range hood is in the off state, the baffle 13 closes the air inlet 21, 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, covers the front of the back panel 111, is in a roughly vertical state, and can fit against the back panel 111.

[0030] 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.

[0031] 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.

[0032] 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 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, it will increase the risk of the pan hitting the food. On the other hand, if the ratio is too small, the air inlet width will be small, affecting the smoothness of air intake.

[0033] 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. Example 2

[0034] See Figure 9In this embodiment, the difference from Embodiment 1 is that the drive mechanism 41 uses a motor, and the transmission mechanism further includes a first gear 422 and a first rack 423. The first gear 422 is connected to the output shaft of the motor and can rotate around a left-right extending axis. The first gear 422 and the first rack 423 mesh, and the first rack 423 is fan-shaped with its teeth formed on the arc surface of the fan shape. The first rack 423 is fixed to the connecting rod 421. The motor, the first gear 422, and the first rack 423 constitute a rotation drive module.

[0035] Therefore, when the motor starts, the first gear 422 can drive the first rack 423 to rotate, which in turn drives the connecting rod 421 to rotate. Example 3

[0036] 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: The upper housing (2) has an air inlet (21) on its bottom surface; as well as An air intake assembly (1) includes a lower housing (11) and a smoke baffle (12) that can rotate relative to the lower housing (11), the lower housing (11) being connected below the upper housing (2); Its features are: The smoke baffle (12) rotates on a fixed axis and has a center of rotation; The air intake assembly (1) also includes a baffle (13) that can open and close the air inlet (21), and the baffle (13) is connected to the smoke baffle (12); When the range hood is in the off state, the air inlet (21) is closed and the smoke baffle (12) covers the front of the lower box (11); When the range hood is in the open state, the baffle (13) rotates relative to the upper box (2) to open the air inlet (21), the smoke baffle (12) is pushed forward to form a smoke collection chamber (Q) between it and the lower box (11), the smoke collection chamber (Q) can be fluidly connected to the upper box (2) through the air inlet (21), and the rotation center of the smoke baffle (12) is higher than the top of the smoke baffle (12) in this state.

2. The range hood according to claim 1, characterized in that: The upper housing (2) is equipped with a fan system (3) and a filter screen (5) located below the fan system (3). The filter screen (5) is located above the air inlet (21) and extends forward beyond the air inlet (21).

3. The range hood according to claim 2, characterized in that: The filter (5) is gradually tilted downward from front to back, and the filter (5) is closed at the position corresponding to the fan system (3).

4. The range hood according to any one of claims 1 to 3, characterized in that: The lower housing (11) includes a back plate (111) and a top plate (113). The back plate (111) is located below the rear side of the upper housing (2). The top plate (113) is formed by extending forward from the top of the back plate (111) and is located on the left and right sides of the upper housing (2).

5. The range hood according to claim 4, characterized in that: The smoke baffle (12) is rotatably mounted on the front side of the back plate (111).

6. The range hood according to any one of claims 1 to 3, characterized in that: The upper end of the smoke baffle (12) or near the upper end is connected to the baffle (13).

7. The range hood according to any one of claims 1 to 3, characterized in that: The rotation center of the smoke baffle (12) is located on the upper box (2).

8. The range hood according to claim 7, characterized in that: The range hood also includes a motion mechanism for driving the smoke baffle (12). The motion mechanism includes a drive mechanism (41) and a transmission mechanism. The drive mechanism (41) is a rotation drive module. The transmission mechanism includes a connecting rod (421) driven to rotate by the rotation drive module. One end of the connecting rod (421) is rotatably connected to the inner side of the upper housing (2), and the center of the rotatable connection is the rotation center of the smoke baffle (12). The other end of the connecting rod (421) is fixed to the smoke baffle (12). The rotation axis of the connecting rod (421) extends in the left-right direction.

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