A range hood

Abstract

This utility model discloses a range hood, comprising: an upper housing assembly containing a fan with an air inlet; an air inlet body capable of moving relative to the upper housing assembly and having a first state and a second state, with a smoke inlet formed thereon; when the air inlet body is in the first state, it is housed within the upper housing assembly; when the air inlet body is in the second state, it is at least partially exposed outside the upper housing assembly, and the smoke inlet is below the bottom of the upper housing assembly and exposed outside the upper housing assembly; and a motion mechanism including a drive mechanism for driving the air inlet body; the upper end of the drive mechanism is installed inside the upper housing assembly and corresponds to the air inlet area; the drive mechanism passes through the upper housing assembly so that its lower end is connected to the air inlet body.

Description

Technical Field

[0001] This utility model relates to an oil fume purification device, and more particularly to an oil fume extractor. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate on the principles of fluid dynamics, using a fan system installed inside to draw in cooking fumes and filtering out some grease particles with a filter. The fan system is typically a centrifugal fan, consisting of a casing, an impeller housed within the casing, and a motor that drives the impeller. When the impeller rotates, a negative pressure suction is generated at the center of the fan, drawing the cooking fumes from below into the fan. After being accelerated by the fan, the fumes are collected by the casing and guided outwards.

[0003] With technological advancements, portable range hoods have gained popularity due to their retractable casing (flipping or lifting movement) when shut down, saving countertop space, ease of maintenance, and a high-tech feel. These range hoods typically consist of an upper and lower casing assembly. The upper casing assembly contains a fan assembly, left and right side guide rails, and a motor-controlled screw that drives a nut to move up and down. The lower casing assembly has a connecting plate fixed to the nut on the upper casing, with the lower ends of angle steel structures connected to the left and right sides, and the upper ends of the angle steel connected to the guide rails on the upper casing. The upper casing motor controls a worm gear rotation, which in turn drives the lower casing assembly to move up and down. The left and right guide rails ensure smooth movement during the lower casing's movement. A similar range hood is disclosed in Chinese Patent Application No. 202421153139.5.

[0004] To improve the reliability of the lead screw, it is generally designed to prevent contact with the grease inside the range hood. The lead screw is isolated from the fan frame by a U-shaped connecting plate. Firstly, this method is typically suitable for long-distance vertical lifting applications, a relatively limited scenario. Secondly, the lead screw is arranged from top to bottom of the fan frame, occupying a significant amount of internal space and affecting the range hood's airflow performance. Thirdly, if the lead screw assembly requires future maintenance, only the motor can be disassembled from the top of the fan frame; disassembling the lead screw requires lifting the range hood, disassembling the upper and lower housings, and then removing the lead screw itself, making maintenance inconvenient. Utility Model Content

[0005] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a range hood in which the arrangement of the moving mechanism reduces the impact on the performance of the range hood.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a range hood, comprising:

[0007] The upper housing assembly contains a fan, which has an air inlet;

[0008] An air inlet body, movable relative to the upper housing assembly, has a first state and a second state. A smoke inlet is formed on the air inlet body. When the air inlet body is in the first state, it is housed within the upper housing assembly. When the air inlet body is in the second state, it is at least partially exposed outside the upper housing assembly, and the smoke inlet is below the bottom of the upper housing assembly and exposed outside the upper housing assembly.

[0009] The motion mechanism includes a drive mechanism for driving the movement of the air intake body;

[0010] Its features are:

[0011] The upper end of the drive mechanism is installed inside the upper housing assembly and corresponds to the air inlet area; the drive mechanism passes through the upper housing assembly so that the lower end is connected to the air inlet body.

[0012] By installing the upper end of the drive mechanism into the upper housing assembly, a short-stroke structure can be adopted, which is suitable for range hoods with moving air intakes. Moreover, the installation position does not exceed the air intake, occupies little space in the flow channel, and has little impact on the smoke extraction performance.

[0013] Preferably, to further reduce the impact on the performance of fume extraction, the upper end of the drive mechanism does not extend upward beyond the center of the air inlet in the vertical direction.

[0014] Furthermore, to facilitate maintenance and disassembly of the drive mechanism, the fan has two air inlets arranged front and back. The motion mechanism also includes a first bracket fixed to the fan frame from front to back and a second bracket fixed to the bottom of the air inlet from bottom to top. The upper end of the drive mechanism is connected to the first bracket, and the lower end of the drive mechanism is connected to the second bracket. The first bracket is detachably connected to the fan frame, and the second bracket is detachably connected to the air inlet.

[0015] Furthermore, to facilitate the inspection and disassembly of the drive mechanism, and to facilitate the removal of the drive mechanism from the fan frame, the upper housing assembly includes a fan frame, the fan is disposed within the fan frame, and the fan frame has a removable fan cover located on the front side;

[0016] The fan also includes a volute, an air outlet cover is provided at the air outlet of the fan, the air inlet is located on the volute, and the maximum length of the drive mechanism is less than the total height of the volute and the air outlet cover.

[0017] Furthermore, the drive mechanism includes a motor and a push rod that extends and retracts driven by the motor, and the assembly of the motor and push rod is sealed using a potting process. Since the assembly of the drive motor and push rod is exposed to the oil circuit, potting sealing prevents the drive mechanism from being contaminated or interfered with by oil fumes.

[0018] Furthermore, the upper housing assembly includes an outer housing and a fan frame disposed on the outer housing. The fan is disposed inside the fan frame. The outer housing includes an upper rear plate located on the rear side. The air inlet includes a lower rear plate located on the rear side. The drive mechanism passes through the upper rear plate and is connected to the lower rear plate. The upper and lower rear plates ensure the sealing of the air inlet and the flow channel inside the upper housing assembly.

[0019] Furthermore, the drive mechanism includes a motor and a push rod that is driven by the motor to extend and retract;

[0020] The upper rear plate includes a first plate and a second plate. The first plate gradually slopes downward from back to front, and the second plate gradually slopes downward and backward from the front end of the first plate. The first plate of the upper rear plate is provided with a first through hole for the push rod to pass through. When the air inlet is in the first state, the lower rear plate is located behind the second plate, so that the lower rear plate can be stored when the air inlet is hidden.

[0021] Furthermore, to prevent the push rod from protruding backward, the lower end of the push rod is connected to the bottom of the lower rear plate, which has a first protrusion protruding forward, through which the push rod passes.

[0022] Furthermore, to facilitate adaptation with the lower rear plate, the second plate of the upper rear plate has a second protrusion to accommodate the first protrusion of the lower rear plate when the air inlet is in the first state.

[0023] Furthermore, due to the limitations of sheet metal stamping processes, the first plate has a second through hole at the upper end of the corresponding second protrusion.

[0024] Furthermore, to prevent oil on the upper rear plate from dripping down through the first and second perforations, the upper housing assembly also includes a cover plate that covers the first and second perforations, and the cover plate has a third perforation corresponding to the first perforation for the push rod to pass through.

[0025] Preferably, the cover plate includes a cover plate body and a folded edge extending downward from the front end of the cover plate body. The cover plate body covers the first and second through holes, the folded edge covers the front side of the upper end of the second protrusion, and the third through hole is provided on the cover plate body.

[0026] Compared with the prior art, the advantages of this utility model are as follows: by installing the upper end of the drive mechanism into the upper housing assembly, a short-stroke structure can be adopted, which is suitable for range hoods with air intake movement, and the installation position does not exceed the air inlet, occupying little flow channel space and having little impact on the smoke extraction performance; by potting and sealing, the drive mechanism is prevented from being affected by oil fumes; by making the upper and lower ends of the drive mechanism detachable, especially the whole assembly can be disassembled from the fan, it is convenient to inspect and maintain the moving mechanism; by using the cover plate, the oil at the perforation of the upper rear plate of the upper housing assembly is prevented from leaking, and the oil on the surface of the part of the push rod inside the oil passage is also prevented from leaking down the push rod. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the range hood in the open state according to an embodiment of the present utility model;

[0028] Figure 2 This is a cross-sectional view (front and back section) of the range hood in the open state according to an embodiment of the present utility model;

[0029] Figure 3 This is a cross-sectional view (section and cross-section) of the range hood in the open state according to an embodiment of the present invention. Figure 2 parallel);

[0030] Figure 4 for Figure 3 A magnified schematic diagram of part I;

[0031] Figure 5 This is a cross-sectional view (section and...) of the range hood with the concealed oil cup in the open state according to an embodiment of the present invention. Figure 2 parallel);

[0032] Figure 6 for Figure 5 A magnified schematic diagram of part II;

[0033] Figure 7 This is a schematic diagram of the upper rear panel of the range hood according to an embodiment of the present utility model;

[0034] Figure 8 This is a schematic diagram of the sealing sleeve of the range hood according to an embodiment of the present utility model;

[0035] Figure 9 This is a schematic diagram of the cover plate of the range hood according to an embodiment of the present utility model;

[0036] Figure 10 This is a schematic diagram of the cover plate of the range hood according to an embodiment of the present utility model (and...). Figure 9 (Different perspectives);

[0037] Figure 11 This is a cross-sectional view (left-right section) of the range hood according to an embodiment of the present utility model;

[0038] Figure 12 This is a cross-sectional view (section and cross-section) of the range hood in the open state according to an embodiment of the present invention. Figure 2 parallel);

[0039] Figure 13 This is a schematic diagram of the transmission mechanism of the moving mechanism of the range hood according to an embodiment of the present utility model;

[0040] Figure 14 This is a schematic diagram of the range hood in the off state according to an embodiment of the present utility model;

[0041] Figure 15 This is a cross-sectional view (front and back section) of the range hood in the closed state according to an embodiment of the present utility model;

[0042] Figure 16 for Figure 15 A magnified schematic diagram of part III;

[0043] Figure 17 This is a cross-sectional view (section and...) of the range hood in the closed state according to an embodiment of the present invention. Figure 15 parallel). Detailed Implementation

[0044] 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.

[0045] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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 utility model 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.

[0046] See Figure 1 , Figure 2 , Figures 12-15 , Figure 17 A range hood includes an upper housing assembly 1, an air inlet 2, a smoke baffle 3, and an oil cup 4.

[0047] The upper housing assembly 1 houses the fan 6. A smoke inlet 21 is formed on the front side of the air inlet 2, and a filter 23 is installed at the smoke inlet 21. The air inlet 2 can move relative to the upper housing assembly 1, thus having a first state and a second state. When the air inlet 2 is in the first state, it is retracted into the upper housing assembly 1 and hidden, located below the fan 6. When the air inlet 2 is in the second state, it is at least partially exposed above the upper housing assembly 1, ensuring that the smoke inlet 21 is below the bottom of the upper housing assembly 1 and exposed above it.

[0048] In this embodiment, the upper housing assembly 1 includes an outer housing 11 and a fan frame 12 disposed on the outer housing 11, with the aforementioned fan 6 disposed within the fan frame 12. The fan 6 has an air inlet 61, and in this embodiment, there are two air inlets 61 arranged front and rear, with the rear air inlet 61 being the main air inlet. The fan 6 also includes a volute 65, an impeller 64 disposed within the volute 65, and a motor 65 for driving the impeller 64, with the air inlet 61 disposed on the volute 65.

[0049] The smoke baffle 3 is installed at the bottom of the upper housing assembly 1, and it can be in the third and fourth states, see [link / reference]. Figure 1 and Figure 2 When the air inlet 2 is in the second state, the smoke baffle 3 is in the third state, and a smoke-collecting cavity Q is formed between the smoke baffle 3 and the front side of the air inlet 2, realizing the downward movement of the smoke inlet 21 and the increase of the smoke-collecting area, ensuring a better oil fume extraction effect in the working state; when the air inlet 2 is in the first state, the smoke baffle 3 is in the fourth state, see Figure 14 and Figure 15 The smoke baffle 3 is enclosed at the bottom of the upper housing assembly 1. It can extend horizontally and be flush with the bottom of the upper housing assembly 1 to achieve a completely flat closed state. At the same time, it closes the smoke inlet 21 of the air inlet 2, minimizing the overall size of the unit.

[0050] The oil cup 4 is located at the bottom rear side of the air inlet 2.

[0051] The air inlet 2 can be raised and lowered relative to the upper housing assembly 1, as described in the background art, and can also rotate relative to the upper housing assembly 1, as disclosed in the movement form of a range hood with a movable smoke hood disclosed in Chinese Patent Application No. 201821250086.3. In this embodiment, the air inlet 2 rotates non-fixed-axis relative to the upper housing assembly 1.

[0052] The range hood also includes a motion mechanism, which comprises a drive mechanism 51 and a transmission mechanism. In this embodiment, the drive mechanism 51 is an electric push rod, which is installed inside the upper housing assembly 1 and includes a motor 511 and a push rod 512, which can extend and retract in the vertical direction. The upper end of the drive mechanism 51 corresponds to the air inlet 61 area of ​​the fan 6 and does not exceed the center of the air inlet 61 in the vertical direction, preferably corresponding to the lower middle part of the air inlet 61, thereby reducing the impact on the performance of the range hood. The lower end of the push rod 512 is connected to the air inlet body 2, and the two sides of the air inlet body 2 are connected to the smoke baffle 3 through the transmission mechanism. As the push rod 512 pushes the air inlet body 2, the smoke baffle 3 can be opened or closed by the transmission mechanism, which will be described in detail below.

[0053] See Figure 12 , Figure 13 and Figure 17 The transmission mechanism has two sets, arranged on the left and right sides of the upper housing assembly 1 respectively. These transmission mechanisms connect the air inlet 2, the smoke baffle assembly 3, and the oil cup 4, allowing the air inlet 2 and the smoke baffle assembly 3 to move stably on their left and right sides. Each transmission mechanism includes a first connecting rod 521, a second connecting rod 522, a third connecting rod 523, a crank 525, and a rocker arm 526. The upper housing assembly 1 serves as the frame of the entire transmission mechanism. One end of the crank 525 is rotatably connected to the interior of the upper housing assembly 1, while the other end is fixed to the smoke baffle assembly 3. The connection point between the crank 525 and the upper housing assembly 1 is denoted as the first hinge point A (a hinge point is any point on the axis of the hinge shaft). The connection point between the crank 525 and the upper housing assembly 1 is located inside the upper housing assembly 1, and the first hinge point A is located above the fixed panel 11. The second connecting rod 522 is fixed to the air inlet body 2. It can extend along the outer side (left and right sides) of the smoke inlet 21 inside the air inlet body 2 and extend out of the air inlet body 2 to be rotatably connected to the crank 525. This rotatable connection point is denoted as the second hinge point B. The second hinge point B does not coincide with the first hinge point A. One end of the first connecting rod 521 is rotatably connected to the crank 525 (the connection point is denoted as the third hinge point C), and the other end is rotatably connected to one end of the rocker arm 526 (the connection point is denoted as the fourth hinge point D). The second hinge point B is located between the first hinge point A and the third hinge point C. The other end of the rocker arm 526 is rotatably connected to the inside of the upper housing assembly 1 (the connection point is denoted as the sixth hinge point F). The connection point between the rocker arm 526 and the upper housing assembly 1 is close to the rear side of the upper housing assembly 1 and higher than any of the aforementioned hinge points. One end of the third link 523 is rotatably connected to the rear end of the second link 522 located inside the air inlet 2 (the connection point is denoted as the seventh hinge point G), and the other end is rotatably connected to the rocker arm 526 (the connection point is denoted as the fifth hinge point E). The fifth hinge point E is located between the fourth hinge point D and the sixth hinge point F.

[0054] The rotation axes of all the above-mentioned rotating connections extend along the left-right direction of the range hood.

[0055] Therefore, when the start-up drive mechanism 51 is activated, it pushes the air intake 2 downward. The air intake 2 then rotates around the first hinge point A via the second connecting rod 522, and through its cooperation with the first connecting rod 521, the third connecting rod 523, and the rocker arm 526 (achieving a movable connection between the air intake 2 and the upper housing assembly 1), it achieves downward flipping and backward movement against the wall (a compound motion of the air intake 2). The same principle applies when the air intake 2 retracts and hides inside the upper housing assembly 1. This motion mechanism ensures that the air intake 2 does not stray far from the wall during its movement and in its final state, thus ensuring effective fume extraction. The movement of the air intake 2, via the second connecting rod 522, causes the crank 525 to rotate around the first hinge point A (the rotation of the crank 525 achieves a non-fixed-axis rotation of the second connecting rod 522), thereby realizing the opening and closing motion of the smoke baffle assembly 3.

[0056] See also Figures 2-6 The motion mechanism also includes a first bracket 531 and a second bracket 532. The first bracket 531 is disposed inside the fan frame 12 and fixed to the rear wall of the fan frame 12. The upper end of the drive mechanism 51 is hinged to the first bracket 531, thereby allowing the drive mechanism 51 to rotate around the hinge point, with the rotation axis extending in the left-right direction. The lower end of the drive mechanism 51 passes through the upper rear plate 111 of the outer casing 11 (the upper rear plate 111 is located on the rear side of the outer casing 11 as a whole, so as to form a closed fume channel above the air inlet 2 when the range hood is working), and then the lower end is hinged to the second bracket 532 on the bottom rear side of the air inlet 2. The second bracket 532 is fixed to the bottom of the air inlet 2, and the lower end of the drive mechanism 51 can rotate around the hinge point, with the rotation axis extending in the left-right direction. When the air inlet 2 moves, the drive mechanism 51 may swing back and forth with a small amplitude.

[0057] To further reduce the impact of the drive mechanism 51 on the performance of the range hood, the drive mechanism 51 is not isolated by a separate component. To avoid the impact of cooking fumes on the reliability of the drive mechanism 51, the assembly of the motor 511 and the push rod 512 is sealed using a potting process.

[0058] See Figure 11 The connection position between the drive mechanism 51 and the first bracket 531 corresponds to the air inlet 61 area of ​​the fan 6, providing operating space for maintenance. The screws (not shown) that fix the first bracket 531 to the fan frame 12 are set in a front-to-back direction, allowing for removal or installation from the front side of the first bracket 531 during maintenance. The rear end of the fixing screw does not extend beyond the back of the fan frame 12; this can be achieved by providing a rearward protrusion to avoid interference between the screw and the rear wall.

[0059] The fan frame 12 typically has a removable fan cover 121 located on the front. During maintenance, the fan cover 121 is removed first, followed by the motor bracket 64 that holds the motor 62 and impeller 63 of the fan 6. Since the rear air inlet 61 is the main air inlet, both the motor 62 and the motor bracket 64 are located on the front, making it easy to disassemble the motor bracket 64. After the motor bracket 64 is removed, the fixing structure of the first bracket 531 can be observed from the front. After removing the fixing screws of the first bracket 531 from front to back, the upper end of the drive mechanism 51, along with the first bracket 531, is detached from the fan frame 12.

[0060] The second bracket 532 fixing structure also needs to be exposed. See [link / reference]. Figure 5 and Figure 6 The oil cup 4 is located below the bottom of the lower rear plate 22. The bottom of the lower rear plate 22 has a positioning hole 222. The screw hole for fixing the second bracket 532 passes through the positioning hole 222 from bottom to top and is fixed to the second bracket 532. During maintenance, after removing the oil cup 4, the fixing screw of the second bracket 532 is removed from the bottom of the lower rear plate 22, and the lower end of the drive mechanism 51 is also detached from the range hood.

[0061] Once both ends of the drive mechanism 51 are detached from their fixed positions, disassembly can be completed. Installation follows the same procedure.

[0062] Because of the presence of the filter 23 in the air inlet 2, when the drive mechanism 51 is removed, it must first extend obliquely forward into the volute 65 of the fan 6. It can utilize the space inside the fan 6 and the air outlet shroud 7 connected to the air outlet of the fan 6, allowing the entire drive mechanism 51 to enter the fan 6 and the air outlet shroud 7. Then, the lower end of the drive mechanism 51 tilts forward, extending forward from inside the fan 6 until the drive mechanism 51 is completely removed. Therefore, in order to allow the drive mechanism 51 to be removed, its maximum length must be less than the height space formed by the volute 65 and the air outlet shroud 7 to avoid jamming during removal.

[0063] As described above, the upper end of the drive mechanism 51 corresponds to the center or lower part of the air inlet 61 and is fixed from front to back by the first bracket 531 of the adapter; the lower end of the drive mechanism 51 is fixed to the lower rear plate 22 in the exposed area at the bottom; the length of the drive mechanism 51 is designed to be able to be taken out from the middle area of ​​the volute 65. In this way, the drive mechanism 51 can be repaired when the range hood is mounted, avoiding the need for multiple people to lift the machine down.

[0064] Due to the hidden requirement of the air inlet body 2, the upper rear plate 111 is bent, including a first plate body 1111 and a second plate body 1112. The first plate body 1111 gradually slopes downward from the rear to the front, and the second plate body 1112 gradually slopes backward downward from the front end of the first plate body 1111. The bending position of the two plate bodies is the foremost end. The air inlet body 2 includes a lower rear plate 22 located at the overall rear side. See Figure 15 , when the air inlet body 2 is hidden into the upper box body assembly 1, the lower rear plate 22 is accommodated behind the second plate body 1112.

[0065] A first through hole 1113 is provided on the first plate body 1111 of the upper rear plate 111. The push rod 512 passes through the first through hole 1113 from top to bottom and is connected to the lower rear plate 22. The front-rear dimension of the first through hole 1113 needs to meet the requirement of the front-rear swing of the push rod 512. Since the push rod 512 needs to be connected to the rear bottom of the lower rear plate 22, the lower rear plate 22 has a first convex portion 221 that protrudes forward. The cross-section of the first convex portion 221 is in a "ji" character structure with the opening facing backward. The push rod 512 passes through the first convex portion 221 to prevent the push rod 512 from protruding backward beyond the lower rear plate 22. For this reason, the second plate body 1112 of the upper rear plate 111 has a second convex portion 1114, and its cross-section is also in a "ji" character structure with the opening facing backward to accommodate the first convex portion 221 of the lower rear plate 22. Due to the limitation of the sheet metal stamping process, a second through hole 1115 is also provided at the upper end of the first plate body 1111 corresponding to the position of the second convex portion 1114.

[0066] Since the upper rear plate 111 is in the oil path of the range hood, the oil liquid will drip from each through hole of the upper rear plate 111, causing oil path problems. For this reason, the first through hole 1113 of the upper rear plate 111 is a flanging hole with the flanging upward. In addition, the upper box body assembly 1 further includes a cover plate 13. The cover plate 13 can be fixed on the upper surface of the upper rear plate 111 by screws and covers the first through hole 1113 and the second through hole 1115. The cover plate 13 includes a cover plate body 131 and a flange 132 extending downward from the front end of the cover plate body 131. The cover plate body 131 covers the first through hole 1113 and the second through hole 1115, and the flange 132 is wrapped around the front side of the upper end of the second convex portion 1114. The cover plate body 131 is provided with a first limiting rib 133 at the position corresponding to the flanging outer periphery of the first through hole 1113. Clamping openings 1116 are respectively formed on the left and right sides of the second convex portion 1114, and the cover plate body 131 is provided with second limiting ribs 134 at the positions corresponding to the clamping openings 1116 to further stabilize the relative positions of the cover plate 13 and the upper rear plate 111 during installation.

[0067] A third through hole 135 is provided at the position of the cover plate body 131 corresponding to the first through hole 1113 for the push rod 512 to pass through. A support edge 136 extending upward from the periphery of the third through hole 135 is further formed on the upper end surface of the cover plate body 131.

[0068] The upper housing assembly 1 also includes a sealing cover 14, which is made of a flexible material. The sealing cover 14 includes a hollow cover 141 with openings at both the top and bottom, and a skirt 142 located on the outer periphery of the bottom of the cover 141. The push rod 512 passes through the sealing cover 14, and the cover 141 and the push rod 512 are fixed together by an interference fit. The skirt 142 covers the upper end face of the support edge 136 of the cover plate 13. The difference between the width of the skirt 142 in the front-to-back direction and the width of the support edge 136 of the cover plate 13 in the front-to-back direction is L. The distance the push rod 512 needs to swing backward during the closing process of the range hood is l. In design, L > l to meet the swinging requirements of the push rod 512. Figure 4 As shown, at this time, push rod 512 (sealing cover 14) is in a state of swinging forward to its limit, and the width difference is formed on the front side, as shown. Figure 16 As shown, at this time, push rod 512 (sealing cover 14) is in a state of swinging backward to the limit, and the width difference is formed on the rear side.

[0069] As the range hood opens and closes, the push rod 512 causes the sealing cover 14 to swing back and forth. Therefore, a downwardly bent portion 143 is provided on the outer periphery of the skirt 142. The bent portion 143 is located at intervals on the outer periphery of the support edge 136 of the cover plate 13, so that the oil above the push rod 512 drips down along the bent portion 143 of the sealing cover 14 and does not enter the third perforation 135 of the cover plate 13.

[0070] Because the sealing cover 14 will swing back and forth with the push rod 512, the rear end may come into contact with the fan frame 12 and deform. In order to improve the durability of the sealing cover 14, thin-walled structures 1421 are provided at both ends of the skirt 142. The thickness of the thin-walled structure 1421 is less than the thickness of other parts of the skirt 142, which enhances the deformability of the local area. In order to improve the installability, the thin-walled structure 1421 is arranged symmetrically at the front and rear.

[0071] The bottom of the sealing cover 14 may have frictional contact with the upper end face of the support edge 136 of the cover plate 13. In order to reduce frictional interference, a protrusion 137 is designed on the upper end face of the support edge 136 of the cover plate 13. When the sealing cover 14 swings back and forth with the push rod 512, the lower end face of the skirt 142 of the sealing cover 14 makes partial contact with the protrusion of the cover plate 13, thereby improving reliability.

[0072] The oil passage at the perforated part on the upper rear plate 111 can be solved by the cover plate 13. In addition, the sealing cover 14 on the push rod 512 can not affect the back and forth swing of the push rod 512, and can also prevent the oil above the push rod 512 from flowing down along the push rod 512 and causing leakage.

[0073] In the above embodiments, the air inlet 2 is described as performing a specific non-fixed-axis rotation. As mentioned above, the air inlet 2 can also perform lifting or fixed-axis rotation. When it is used for lifting, the difference from the above embodiments is that the drive mechanism 51 and the fan frame 12, and the drive mechanism 51 and the lower rear plate 22 can be fixedly connected, without needing to consider the swing of the push rod 512. When it is used for fixed-axis rotation, the drive mechanism 51 is at least hinged to the second bracket 532, and the push rod 512 is allowed to swing to a certain extent, such as the movement form disclosed in a range hood with a movable smoke hood disclosed in Chinese Patent Application No. 201821250086.3.

Claims

1. A range hood, comprising: The upper housing assembly (1) is provided with a fan (6) inside, the fan (6) having an air inlet (61); An air inlet (2) is movable relative to the upper housing assembly (1) and has a first state and a second state. A smoke inlet (21) is formed on the air inlet (2). When the air inlet (2) is in the first state, it is housed within the upper housing assembly (1). When the air inlet (2) is in the second state, it is at least partially exposed outside the upper housing assembly (1), and the smoke inlet (21) is below the bottom of the upper housing assembly (1) and exposed outside the upper housing assembly (1). The motion mechanism includes a drive mechanism (51) for driving the air intake body (2) to move; Its features are: The upper end of the drive mechanism (51) is installed inside the upper housing assembly (1) and corresponds to the air inlet (61) area; the drive mechanism (51) passes through the upper housing assembly (1) so that the lower end is connected to the air inlet body (2).

2. The range hood according to claim 1, characterized in that: The upper end of the drive mechanism (51) does not extend upward beyond the center of the air inlet (61) in the vertical direction.

3. The range hood according to claim 1, characterized in that: The fan (6) has two air inlets (61) arranged in a front-to-back configuration. The motion mechanism also includes a first bracket (531) fixed to the fan frame (12) from front to back and a second bracket (532) fixed to the bottom of the air inlet (2) from bottom to top. The upper end of the drive mechanism (51) is connected to the first bracket (531), and the lower end of the drive mechanism (51) is connected to the second bracket (532). The first bracket (531) is detachably connected to the fan frame (12), and the second bracket (532) is detachably connected to the air inlet (2).

4. The range hood according to claim 3, characterized in that: The upper housing assembly (1) includes a fan frame (12), the fan (6) is disposed inside the fan frame (12), and the fan frame (12) has a removable fan cover (121) located on the front side; The fan (6) also includes a volute (65), and an air outlet cover (7) is provided at the air outlet of the fan (6). The air inlet (61) is located on the volute (65), and the maximum length of the drive mechanism (51) is less than the total height of the volute (65) and the air outlet cover (7).

5. The range hood according to claim 1, characterized in that: The drive mechanism (51) includes a motor (511) and a push rod (512) that is driven by the motor (511) to extend and retract. The combination of the motor (511) and the push rod (512) is sealed by a potting process.

6. The range hood according to claim 1, characterized in that: The upper housing assembly (1) includes an outer housing (11) and a fan frame (12) disposed on the outer housing (11). The fan (6) is disposed inside the fan frame (12). The outer housing (11) includes an upper rear plate (111) located on the rear side. The air inlet (2) includes a lower rear plate (22) located on the rear side. The drive mechanism (51) passes through the upper rear plate (111) and is connected to the lower rear plate (22).

7. The range hood according to claim 6, characterized in that: The drive mechanism (51) includes a motor (511) and a push rod (512) that is driven by the motor (511) to extend and retract; The upper rear plate (111) includes a first plate (1111) and a second plate (1112). The first plate (1111) gradually slopes downward from back to front, and the second plate (1112) gradually slopes downward and backward from the front end of the first plate (1111). The first plate (1111) of the upper rear plate (111) is provided with a first through hole (1113) for the push rod (512) to pass through. When the air inlet (2) is in the first state, the lower rear plate (22) is located behind the second plate (1112).

8. The range hood according to claim 7, characterized in that: The lower end of the push rod (512) is connected to the bottom of the lower rear plate (22), which has a first protrusion (221) that protrudes forward, through which the push rod (512) passes.

9. The range hood according to claim 8, characterized in that: The second plate (1112) of the upper rear plate (111) has a second protrusion (1114) to accommodate the first protrusion (221) of the rear plate (22) when the air inlet (2) is in the first state.

10. The range hood according to claim 9, characterized in that: The first plate (1111) has a second through hole (1115) at the upper end of the corresponding second protrusion (1114).

11. The range hood according to claim 10, characterized in that: The upper housing assembly (1) also includes a cover plate (13), which covers the first through hole (1113) and the second through hole (1115). The cover plate (13) is provided with a third through hole (135) at the position corresponding to the first through hole (1113) for the push rod (512) to pass through.

12. The range hood according to claim 11, characterized in that: The cover plate (13) includes a cover plate body (131) and a flange (132) extending downward from the front end of the cover plate body (131). The cover plate body (131) covers the first perforation (1113) and the second perforation (1115). The flange (132) covers the front side of the upper end of the second protrusion (1114). The third perforation (135) is provided on the cover plate body (131).

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