A switch air suction port assembly and a range hood having the same

Abstract

The present application relates to the technical field of range hood, and discloses a switchable air inlet assembly and a range hood with the same, the switchable air inlet assembly comprises a panel, a wind collecting box, a damper plate assembly and a cleaning device, the damper plate assembly comprises a guide rail, a damper plate and a driving device, the damper plate is provided with a shielding surface and a wind guide opening, the damper plate has a first position for shielding the air inlet, a second position for the wind guide opening corresponding to the air inlet and a third position for the shielding surface facing the cleaning device on the guide rail, and the driving device drives the damper plate to move on the guide rail; compared with the prior art, the switchable air inlet assembly can close the air inlet by the damper plate when the range hood is turned off, so that the external dust can be reduced to enter the wind collecting box and the dirt can be reduced to generate on the inner cavity wall surface of the wind collecting box; when the damper plate moves to the third position, the cleaning device can clean the shielding surface, so that the appearance of the panel is clean and tidy when the damper plate moves to the first position and closes the air inlet from the user side.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, specifically to an on / off air intake assembly and a range hood having the same. Background Technology

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. It quickly removes waste from stove combustion and cooking fumes, expelling them outdoors, thus reducing pollution and purifying the air. When the range hood is working, the airflow of cooking fumes is drawn towards the air inlet on the range hood's panel by the exhaust fan, and then enters the collection box connected to the inlet. Finally, it is exhausted from the exhaust duct by the exhaust fan inside the collection box. Over time, the oil and water mixture from the fumes adheres to and accumulates on the inner wall of the collection box. When dust from outside air enters the collection box through the air inlet, it mixes with the oil and water mixture on the inner wall, forming grime that adheres to the inner wall of the collection box and the casing of the exhaust fan. The grime formed by oil, water, and dust is quite viscous. Once it adheres to the inner wall of the air collection box and the exhaust fan, it is difficult to drip off from these surfaces. When a large amount of grime accumulates, it will affect the purification effect of the range hood. Users will need to disassemble the range hood to thoroughly clean the grime, and this grime is also quite difficult to remove. Summary of the Invention

[0003] The purpose of this invention is to provide an on / off air intake assembly and a range hood having the same, which solves the above-mentioned technical problems.

[0004] An on / off air intake assembly for a range hood, comprising:

[0005] The panel has an air intake vent.

[0006] The air collection box is connected to the air intake.

[0007] A damper assembly includes a guide rail, a damper plate, and a drive device disposed within an air collection box. The guide rail is disposed along the inner wall of the panel. The damper plate is provided with a shielding surface and an air guide opening. The damper plate has a first position, a second position, and a third position on the guide rail. The drive device drives the damper plate to move between any two of the first, second, and third positions.

[0008] A cleaning device is installed on the inner wall of the air collection box;

[0009] When the damper is in the first position, the shielding surface blocks the air intake, the air intake is closed, and the shielding surface becomes the appearance surface of the panel; when the damper is in the second position, the air guide opening corresponds to the air intake, the air intake is opened and used for air intake; when the damper is in the third position, the shielding surface of the damper faces the cleaning device, and the cleaning device cleans the shielding surface.

[0010] According to one embodiment of the present invention, the guide rail has an included angle connecting the second position and the third position, the included angle causing the damper plate to move away from the panel and form an included angle of 15°-45° with the inner wall surface of the panel when the damper plate is in the third position.

[0011] According to one embodiment of the present invention, the cleaning device includes a brush assembly, the brush assembly including a rotating brush facing the shielding surface, the rotating brush having a resilient brush head that resiliently contacts and cleans the shielding surface; and / or the cleaning device includes a spray assembly, the spray assembly including a water supply pipe and cleaning nozzles facing the shielding surface, the water supply pipe being horizontally arranged along the shielding surface, and a plurality of cleaning nozzles being spaced apart along the water supply pipe.

[0012] According to one embodiment of the present invention, the brush assembly further includes a fixed bracket disposed in the air collection box, a rotating brush disposed on the fixed bracket, and a brush rotation drive member disposed on the fixed bracket capable of driving the rotating brush to rotate relative to the fixed bracket.

[0013] According to one embodiment of the present invention, the spray assembly further includes a support assembly disposed on the inner wall of the air collection box, a water supply pipe disposed on the support assembly, and a rotation drive structure capable of driving the water supply pipe to rotate on the support assembly; the inner wall of the air collection box is also provided with a guide structure capable of allowing the support assembly to slide, and the guide structure is provided with an up-down drive structure for driving the support assembly to slide along the guide structure.

[0014] According to one embodiment of the present invention, the spray assembly has a first cleaning position and a second cleaning position. In the first cleaning position, the spray assembly is located between the damper plate and the inner wall surface of the panel. At this time, the damper plate is in the third position, the air intake is open, the exhaust fan of the range hood is running, and the spray assembly cleans the shielding surface. In the second cleaning position, the spray assembly is located above the air intake. At this time, the exhaust fan of the range hood is closed, the damper plate is in the first position, and the shielding surface blocks the air intake. The cleaning nozzle rotates 360° and sprays cleaning medium to clean the exhaust fan of the range hood and the inner wall of the air collection box.

[0015] According to one embodiment of the present invention, the shielding surface is provided with a bulge protruding towards the air intake, the bulge being adapted to the air intake. When the damper plate is in the first position, the bulge extends into the air intake and the top surface of the bulge is flush with the outer surface of the panel. The guide rail includes a first direction section and a second direction section. When the damper plate slides on the first direction section, the damper plate switches between the first position and the second position, and the bulge extends out from the air intake or the air guide opening corresponds to the air intake. When the damper plate slides on the second direction section of the guide rail and moves to the third position, the damper plate is tilted, and the cleaning device cleans the bulge.

[0016] A range hood, employing the aforementioned switchable air intake assembly, further includes an exhaust fan. When the exhaust fan is off, a drive device causes the damper plate's shielding surface to block the air intake, thus closing the air intake. When the exhaust fan is on, the air guide opening aligns with the air intake, thereby opening the air intake. Alternatively, the damper plate moves to a third position, opening the air intake, while a cleaning device cleans the shielding surface.

[0017] According to one embodiment of the present invention, the device further includes a PM2.5 detection module capable of real-time detection of ambient air quality and a display control device capable of displaying its detection data. The damper assembly, cleaning device, exhaust fan, and PM2.5 detection module are all electrically connected to the display control device. When the detection value of the PM2.5 detection module reaches the set range, the display control device sends a start command to the exhaust fan and damper assembly. The drive device drives the damper to slide to the second position, the air intake opens, and the exhaust fan enters the running state. Alternatively, when the detection value of the PM2.5 detection module reaches the set range, the display control device sends a start command to the exhaust fan, damper assembly, and cleaning device. The drive device drives the damper to slide to the third position, the air intake opens, the exhaust fan enters the running state, and the cleaning device cleans the damper's shielding surface.

[0018] According to one embodiment of the present invention, the bottom of the air collection box is provided with an oil leakage hole and an oil cup for receiving oil spillage from the oil leakage hole, and a liquid level sensor is provided in the oil cup; when the damper plate is in the first position and the air intake is closed, the exhaust fan is turned off, the cleaning device is started and cleans the exhaust fan and the inner wall of the air collection box, the cleaning device adjusts the spraying time according to the amount of oil collected in the oil cup, and the cleaning device stops operating after the spraying time is reached.

[0019] Compared with the prior art, the switchable air intake assembly of the present invention has the following advantages:

[0020] The air intake assembly of the present invention, when the range hood is turned off, closes the air intake with the damper plate, which can reduce the entry of external dust into the air collection box and reduce the generation of dirt on the inner wall of the air collection box; and when the damper plate moves to the third position, the cleaning device cleans the shielding surface, so that when the damper plate moves to the first position and the shielding surface covers the air intake, the shielding surface seen from the user side is clean, which can keep the appearance of the panel side of the range hood clean and tidy. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of a range hood with the switchable air intake assembly of the present invention after removing the back panel;

[0022] Figure 2 This is an exploded view of the damper plate assembly of the switchable air intake assembly of the present invention;

[0023] Figure 3 This is a front view of a range hood having the switchable air intake assembly of the present invention;

[0024] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0025] Figure 5 for Figure 4 A magnified view of part B in the image;

[0026] Figure 6 This is an exploded view of one embodiment of the brush assembly of the range hood of the present invention;

[0027] Figure 7 This is an exploded view of another embodiment of the brush assembly of the range hood of the present invention;

[0028] In the diagram: 1. Panel, 11. Air intake, 2. Air collection box, 21. Guide structure, 22. Oil leakage hole, 23. Oil cup, 24. First bracket, 25. Back plate, 3. Damper plate assembly, 31. Guide rail, 311. First direction section, 312. Second direction section, 32. Damper plate, 321. Air guide opening, 322. Bulge, 323. Washer, 33. Drive device, 34. Bearing, 35. Shock absorber, 4. Cleaning device, 4 1. Rotating brush; 44. Fixed bracket; 45. Brush rotation drive component; 49. Brush up-and-down drive structure; 42. Water supply pipe; 43. Cleaning nozzle; 46. Bracket assembly; 47. Rotation drive structure; 471. Drive motor; 472. First connecting rod; 473. Second connecting rod; 474. Third connecting rod; 48. Up-and-down drive structure; 5. Smoke exhaust fan; 6. PM2.5 detection module; 7. Display and control device.

[0029] The implementation and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The following drawings disclose several embodiments of the present invention. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0032] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, such a combination should be considered nonexistent and not within the scope of protection claimed by this invention.

[0033] To further understand the content, features, and effects of this invention, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings:

[0034] This invention discloses an on / off air intake assembly; please refer to [link / reference]. Figure 1 and Figure 2The present invention discloses an air intake assembly for a range hood, comprising a panel 1, an air collection box 2, an air damper assembly 3, and a cleaning device 4. The panel 1 has an air intake 11, and the air collection box 2 is connected to the air intake 11. The air damper assembly 3 includes a guide rail 31 disposed within the air collection box 2, an air damper 32 slidably connected to the guide rail 31, and a driving device 33 for driving the air damper 32 to slide on the guide rail 31. The guide rail 31 is disposed along the inner wall of the panel 1. The air damper 32 has a shielding surface and an air guide opening 321. The air damper 32 has a first position, a second position, and a third position on the guide rail 31. Device 33 drives damper plate 32 to move between any two of the first, second, and third positions; cleaning device 4 is disposed on the inner wall of air collection box 2; wherein, when damper plate 32 is in the first position, the shielding surface blocks the air intake 11, the air intake 11 is closed, and the part of the shielding surface corresponding to the air intake 11 becomes the outer surface of panel 1; when damper plate 32 is in the second position, the air guide opening 321 corresponds to the air intake 11, the air intake 11 is opened and used for air intake; when damper plate 32 is in the third position, the shielding surface of damper plate 32 faces the cleaning device 4, and the cleaning device 4 cleans the shielding surface. When the air intake assembly of the present invention is applied to a range hood, during the operation of the range hood, the drive device 33 drives the damper plate 32 to move on the guide rail 31, causing the damper plate 32 to move to the second position on the guide rail 31. At this time, the air guide opening 321 on the damper plate 32 corresponds to the air intake 11, and the air intake 11 is opened. After the exhaust fan of the range hood is started, external fumes begin to enter the air collection box 2 through the air intake 11 and the air guide opening 321. The fumes entering the air collection box 2 flow towards the exhaust fan of the range hood and are discharged from the air collection box 2 by the exhaust fan. After the exhaust fan is turned off, the drive device 33 drives the damper plate 32 to move on the guide rail 31, causing the damper plate 32 to move from the second position to the first position on the guide rail 31. The shielding surface on the damper plate 32... By blocking the air intake 11 and closing it, ambient air cannot enter the air collection box 2 through the air intake 11 when the range hood is turned off. Dust in the air will also not mix with the oil and water mixture adhering to the inner wall of panel 1, the inner wall of air collection box 2, and the housing of exhaust fan when the range hood is turned off, thus reducing the generation of dirt. The oil and water mixture adhering to the inner wall of panel 1, the inner wall of air collection box 2, and the housing of exhaust fan has a relatively low viscosity. After accumulating to a certain amount, it will flow downward along the inner wall of panel 1, the inner wall of air collection box 2, and the housing of exhaust fan under its own gravity and drip onto the bottom plate of air collection box 2. Finally, it drips from the oil drain hole on the bottom plate of air collection box 2 into the oil cup at the bottom of air collection box 2 and is collected.When the damper plate 32 moves to the first position and the shielding surface on the damper plate 32 blocks the air intake 11, the user can see the shielding surface on the damper plate 32 from the outside of the panel 1. If there is a mixture of oil and water on the shielding surface, external dust will mix with the oil and water mixture on the shielding surface and then form dirt on the shielding surface, affecting the appearance of the panel side of the range hood. For this reason, the damper plate 32 also has a third position on the guide rail 31. When the drive device 33 drives the damper plate 32 to move on the guide rail 31, so that the damper plate 32 moves to the third position, the shielding surface of the damper plate 32 faces the cleaning device 4. The cleaning device 4 starts and cleans the shielding surface, cleaning the shielding surface clean. In this way, when the damper plate 32 moves to the first position on the guide rail 31 and the shielding surface on the damper plate 32 blocks the air intake 11, the shielding surface seen from the user side is clean, which can keep the appearance of the panel side of the range hood clean and tidy.

[0035] Because the damper plate 32 is located inside the air collection box 2, and the panel 1 has thickness, even when the damper plate 32 closes the air intake 11, and the shielding surface of the damper plate 32 is tightly attached to the inner wall of the panel 1, the air intake 11 still forms a groove in the thickness direction of the panel 1. This means that the outer surface of the panel 1 is not a complete flat surface, affecting the flatness of the panel side of the range hood. Furthermore, after the fumes pass through the air intake 11, a mixture of oil and water adheres to the inner wall of the air intake 11. The groove formed after the shielding surface blocks the air intake 11 is prone to accumulating dirt, making it inconvenient for users to clean. Please refer to [link / reference]. Figure 2 and Figure 5 To solve this problem, the switch air intake assembly of the present invention has a bulge 322 protruding in the direction of the air intake 11 on the shielding surface. The bulge 322 is adapted to the air intake 11. When the damper plate 32 is in the first position, the bulge 322 extends into the air intake 11 and the top surface of the bulge 322 is flush with the outer side surface of the panel 1. When the switchable air intake assembly of the present invention is used in a range hood, when the exhaust fan is turned off, the drive device 33 drives the damper plate 32 to move on the guide rail 31, so that the damper plate 32 moves to the first position. The air guide opening 321 on the damper plate 32 is offset from the air intake 11 on the panel 1. The bulge 322 on the shielding surface of the damper plate 32 extends into the air intake 11 and blocks the air intake 11, so the air intake 11 is closed. After the bulge 322 extends into the air intake 11, the top surface of the bulge 322 is flush with the outer side surface of the panel 1. The top surface of the bulge 322 and the outer side surface of the panel 1 are located on the same plane, so that the appearance surface of the panel 1 of the range hood remains flat.

[0036] Please see Figure 5In the air intake assembly of the present invention, a deformable washer 323 is provided on the side wall of the bulge portion 322. When the damper plate 32 is in the first position, the damper plate 32 is close to the panel 1, the bulge portion 322 extends into the air intake 11 and closes the air intake 11, the top surface of the bulge portion 322 is flush with the outer side surface of the panel 1, and the washer 323 on the side wall of the bulge portion 322 is pressed together with the side wall surface of the air intake 11 and seals the air intake 11, so that the bulge portion 322 can seal the air intake 11 tightly.

[0037] Please see Figure 2 and Figure 4The switchable air intake assembly of the present invention has a guide rail 31 with an included angle connecting a second position and a third position. This included angle causes the damper plate 32, in the third position, to move away from the panel 1 and form an angle of 15°-45° with the inner wall surface of the panel 1. The included angle connecting the second and third positions means that the damper plate 32 is on different planes when it is in the second and third positions on the guide rail 31. It is readily apparent that when the damper plate 32 is in the first position on the guide rail 31, the shielding surface of the damper plate 32 blocks the air intake 11, and the damper plate 32 needs to be tightly against the inner wall surface of the panel 1 to seal the air intake 11. When the damper plate 32 is in the second position on the guide rail 31, the air guide opening 321 of the damper plate 32 corresponds to the air intake 11, and the damper plate 32 also needs to be tightly against the inner wall surface of the panel 1 for the air guide opening 321 on the damper plate 32 to correspond to the air intake 11 and allow the outer surface of the panel 1 to be sealed. The fumes cannot enter the gap between the damper plate 32 and the panel 1. When the damper plate 32 is in the third position on the guide rail 31, the shielding surface of the damper plate 32 faces the cleaning device 4. The cleaning device 4 is placed between the damper plate 32 and the panel 1. Therefore, the first and second positions of the damper plate 32 on the guide rail 31 are on the same plane. The third position of the damper plate 32 on the guide rail 31 is a plane that is inclined relative to the panel 1 towards the back plate of the air collection box 2. When the damper plate 32 is in the third position on the guide rail 31, a receiving cavity is formed between the damper plate 32 and the inner wall surface of the panel 1. The cleaning device 4 is located in the receiving cavity and cleans the shielding surface. It is important to understand that when the damper plate 32 is in the third position on the guide rail 31, the air intake 11 on the panel 1 is still open. That is to say, there are two situations in which the air intake 11 is open. The first situation is that the damper plate 32 is in the second position on the guide rail 31 and the air guide opening 321 corresponds to the air intake 11. The second situation is that the damper plate 32 is in the third position on the guide rail 31. At this time, the damper plate 32 slides to the bottom of the air intake 11 and is tilted relative to the panel 1. As long as the air intake is open, the exhaust fan of the range hood can be turned on and run. When the air intake 11 is open in the first case, the damper plate 32 is located on the section of the guide rail 31 close to the inner wall of the panel 1 and is in close contact with the inner wall of the panel 1. At this time, the damper plate 32 will not affect the oil and water mixture on the exhaust fan in the air collection box 2 from dripping to the bottom of the air collection box 2. However, when the air intake 11 is open in the second case, the damper plate 32 is tilted and the lower end of the damper plate 32 extends towards the back plate of the air collection box 2. If the tilt angle of the damper plate 32 is too large, when its lower end contacts the back plate of the air collection box 2, it will hinder the oil and water mixture on the exhaust fan from flowing to the bottom of the air collection chamber. If the tilt angle of the damper plate 32 is too small, the gap between the damper plate 32 and the panel 1 is not large enough to accommodate the cleaning device 4.Therefore, when the damper plate 32 is set in the third position, the damper plate 32 is far away from the panel 1 and forms an angle of 15°-45° with the inner wall surface of the panel 1, so that the gap between the damper plate 32 and the inner wall surface of the panel 1 is sufficient to accommodate the cleaning device 4. When the cleaning device 4 is placed between the two, there is still a gap between the cleaning device 4 and the panel 1, while the damper plate 32 will not affect the oil and water mixture on the exhaust fan in the air collection box 2 from dripping to the bottom of the air collection box 2.

[0038] Please see Figure 2 and Figure 4 The switchable air intake assembly of the present invention includes a guide rail 31 comprising a first direction section 311 and a second direction section 312. When the damper plate 32 slides along the first direction section 311, the damper plate 32 switches between a first position and a second position, with the bulge portion 322 extending out from the air intake 11 or the air guide opening 321 corresponding to the air intake 11. When the damper plate 32 slides along the second direction section 312 of the guide rail 31 and moves to a third position, the damper plate 32 is tilted, and the cleaning device 4 cleans the bulge portion 322. The first section 311 and the second section 312 are on different planes. When the first section 311 is close to the inner wall of the panel 1, there is a gap between the second section 312 and the inner wall of the panel 1. The first position and the second position are set on the first section 311, and the third position is set on the second section 312. When the damper plate 32 slides on the first section 311, the damper plate 32 switches between the first position and the second position. The bulge 322 extends from the air intake 11 to close the air intake 11, or the air guide opening 321 corresponds to the air intake 11 to open the air intake 11. When the driving device 33 drives the damper plate 32 to move along the second section 312, when the damper plate 32 moves to the third position on the second section 312, the damper plate 32 is tilted. A receiving cavity that can accommodate the cleaning device 4 is formed between the damper plate 32 and the panel 1. When the cleaning device 4 is started, the cleaning device 4 can clean the shielding surface and the bulge 322 on the shielding surface. It is important to understand that when the damper plate 32 moves to the third position on the second section 312, the entire damper plate 32 moves below the air intake 11. At this time, the air intake 11 is still open. When the exhaust fan of the range hood is started, external air can still enter the air collection box 2 through the air intake 11 and then be discharged from the air collection box 2 by the exhaust fan. In other words, when the damper plate 32 is in the third position, the cleaning device 4 will not affect the operation of the range hood when cleaning the shielding surface of the damper plate 32. After the exhaust fan is turned off, the drive device 33 can just transport the damper plate 32 with the shielding surface cleaned to the first position, close the air intake 11, and the clean bulge 322 extends out from the air intake 11, keeping the outer side of the panel 1 clean and tidy.

[0039] Please see Figure 1 and Figure 2The air intake assembly of the present invention includes a first horizontally arranged bracket 24 inside the air collection box 2. A drive device 33 is mounted on the first bracket 24, and the drive end of the drive device 33 is fixedly connected to the lower end of the damper plate 32 and can drive the damper plate 32 to slide along the guide rail 31. Bearings 34 that can slide on the guide rail 31 are provided on both sides of the damper plate 32, and shock absorbers 35 are sleeved on the bearings 34. When the drive device 33 is started, the drive device 33 drives the damper plate 32 to slide along the guide rail 31. When the damper plate 32 slides along the guide rail 31, the bearings 34 on both sides of the damper plate 32 slide along the guide rail 31, which can reduce the friction between the damper plate 32 and the guide rail 31. Furthermore, since the bearings 34 are provided with shock absorbers 35, the shock absorbers 35 can reduce the vibration generated when the bearings 34 slide along the guide rail 31, making the sliding of the damper plate 32 by the drive device 33 along the guide rail 31 more stable.

[0040] In some embodiments, the drive device 33 is a drive motor, the output end of the drive motor is connected to an output gear, the output gear meshes with a rack, the rack is connected to the damper plate 32, when the drive motor starts, the output end of the drive motor drives the output gear to rotate, the output gear meshes with the rack and drives the rack to move up and down, thereby causing the damper plate 32 to slide along the guide rail 31.

[0041] In some embodiments, the drive device 33 is a drive motor, the output end of the drive motor is connected to a lead screw, a lead screw nut is sleeved on the lead screw, and the lead screw nut is connected to the damper plate 32. When the drive motor starts, the output end of the drive motor drives the lead screw to rotate, and the lead screw nut slides up and down along the lead screw, thereby causing the damper plate 32 to slide along the guide rail 31.

[0042] Please see Figure 1 and Figure 2 In the illustrated embodiment, the drive device 33 is an electric push rod, the drive end of which is connected to the damper plate 32. When the electric push rod is started, it drives the damper plate 32 to slide along the guide rail 31.

[0043] Please see Figure 1In some embodiments, the cleaning device 4 of the air intake assembly includes a spray assembly, which includes a water supply pipe 42 and cleaning nozzles 43 facing the shielding surface. The water supply pipe 42 is horizontally arranged along the shielding surface, and multiple cleaning nozzles 43 are spaced apart along the water supply pipe 42. When the damper plate 32 moves to the third position on the guide rail 31, the shielding surface of the damper plate 32 faces the spray assembly. The spray assembly is activated, and the cleaning medium is introduced into the water supply pipe 42 and enters the cleaning nozzles 43 through the water supply pipe 42. Then, it is sprayed out by the cleaning nozzles 43, which spray the cleaning medium towards the shielding surface to clean it. When the damper plate 32 moves to the third position on the guide rail 31, the air intake 11 opens. At this time, the exhaust fan of the range hood runs. There is a gap between the damper plate 32 and the panel 1. When the spray assembly starts and cleans the shielding surface, the cleaning nozzle 43 of the spray assembly sprays the cleaning medium onto the shielding surface. The cleaning medium washes the shielding surface to clean the oil stains on the shielding surface. When the cleaning medium is sprayed onto the shielding surface by the cleaning nozzle 43, water splashes will be generated when the cleaning medium is sprayed onto the shielding surface. The water splashes will splash from the gap between the shielding surface and the inner wall surface of the panel 1. At this time, due to the operation of the exhaust fan, the exhaust fan will create a negative pressure at the air intake 11. The negative pressure will draw the air outside the panel 1 into the air collection box 2 through the air intake 11. Therefore, when the cleaning medium generated by the cleaning nozzle 43 cleans the shielding surface, the water splashes will fall into the air collection box 2 under the action of the air flow entering through the air intake 11 when they enter the gap between the inner wall surface of the panel 1 and the shielding surface. They will not splash out from the air intake 11, thus preventing the cleaning medium from flying out from the air intake 11 and falling into the food being cooked.

[0044] Please see Figure 1The switchable air intake assembly and spray assembly of the present invention further include a support assembly 46 disposed on the inner wall of the air collection box 2, a water supply pipe 42 disposed on the support assembly 46, and a rotation drive structure 47 disposed on the support assembly 46 capable of driving the water supply pipe 42 to rotate; the inner wall of the air collection box 2 is also provided with a guide structure 21 capable of allowing the support assembly 46 to slide, and the guide structure 21 is provided with an up-down drive structure 48 for driving the support assembly 46 to slide along the guide structure 21. When the air intake assembly of the present invention is applied to a range hood, during the operation of the range hood, the drive device 33 drives the damper plate 32 to move on the guide rail 31, causing the damper plate 32 to move onto the second section 312 of the guide rail 31 and be in the third position. At this time, the damper plate 32 is located below the air intake 11, the air intake 11 is opened, the exhaust fan is started, the damper plate 32 is inclined relative to the panel 1, and the spray assembly is located between the damper plate 32 and the panel 1. This position is set as the first cleaning position of the spray assembly. After the exhaust fan of the range hood is started, external fumes begin to enter the air collection box 2 through the air intake 11. The fumes in the air collection box 2 flow to the exhaust fan of the range hood and are discharged from the air collection box 2 by the exhaust fan. During the process of the exhaust fan starting and sucking up the fumes, the spray assembly is activated in the first cleaning position, the upper and lower drive structure 48 is not running, the externally supplied cleaning medium enters the water supply pipe 42 and is delivered to the cleaning nozzle 43 through the water supply pipe 42. The rotation drive structure 47 drives the water supply pipe 42 to rotate, and the cleaning nozzle 43 rotates 360° with the water supply pipe 42 and sprays the cleaning medium to clean the shielding surface of the damper plate 32. After the exhaust fan is turned off, the drive device 33 drives the damper plate 32 to move on the guide rail 3. The damper plate 32 moves upward, moving from the second section 312 of the guide rail to the first section 311, and then to the first position. At this time, the shielding surface on the damper plate 32 blocks the air intake 11, and the bulge 322 extends into the air intake 11 and closes it. At this time, the cleaning device 4 is activated. The up-down drive structure 48 drives the support assembly 46 to move along the guide structure 21 on the inner wall of the air collection box 2. At the same time, the rotation drive structure 47 starts to drive the water supply pipe 42 to rotate around the support assembly 46. The water supply pipe 42 drives the cleaning nozzle 43 on it to rotate. When the cleaning medium is delivered to the cleaning nozzle 43 through the water supply pipe 42, The cleaning nozzle 43 sprays the cleaning medium into the spraying area. The spraying area of ​​the cleaning nozzle 43 includes at least a first spraying area corresponding to the inner wall surface of the panel 1. After the cleaning nozzle 43 sprays the cleaning medium into the first spraying area, the cleaning medium cleans the inner wall surface of the range hood panel 1, cleaning the mixture of oil and water adhering to the inner wall surface of the range hood panel 1. This can automatically clean the oil stains adhering to the inner wall surface of the panel 1, keeping the air collection box 2 of the range hood clean. Users can clean the oil stains accumulated in the air collection box 2 of the range hood without having to remove the range hood.

[0045] Please see Figure 4 The switchable air intake assembly of the present invention includes an air collection box 2 comprising a back plate 25, and the spraying area of ​​the cleaning nozzle 43 further includes a second spraying area corresponding to the inner wall surface of the back plate 25. When the switchable air intake assembly of the present invention is applied to a range hood, during the operation of the range hood, external fumes enter the air collection box 2 through the air intake 11 on the panel 1 of the range hood, and are then discharged from the air collection box 2. After entering the air collection box 2, the fumes flow towards the air inlet of the exhaust fan under the action of the exhaust fan. During the flow towards the exhaust fan, part of the airflow formed by the fumes will directly enter the housing of the exhaust fan through the air inlet of the exhaust fan, and another part will rush onto the back plate 25, and then flow along the back plate 25 towards the air inlet of the exhaust fan, and then enter the housing of the exhaust fan, and finally be discharged from the air collection box 2 by the exhaust fan. During the entire smoke extraction process, the fumes enter the air collection box 2 through the air intake 11 and then flow towards the exhaust fan. Since the exhaust fan is located above the air intake 11, the fumes flow upwards after entering the air collection box 2. Therefore, the oil and water mixture formed by the fumes in the air collection box 2 during the smoke extraction process mainly adheres to the inner wall surface of the back panel 25 above the air intake 11 and the inner wall surface of the panel 1 above the air intake 11. When the oil and water mixture accumulates to a certain amount on the inner wall surface of the back panel 25 above the air intake 11 and the inner wall surface of the panel 1 above the air intake 11, this oil... The mixture of water and backplate 25 flows along the inner wall surface of the backplate 25 above the air intake 11 to the inner wall surface of the backplate 25 below the air intake 11, and along the inner wall surface of the panel 1 above the air intake 11 to the inner wall surface of the panel 1 below the air intake 11. Therefore, the spraying area of ​​the cleaning nozzle 43 includes a first spraying area corresponding to the inner wall surface of the panel 1 of the range hood and a second spraying area corresponding to the inner wall surface of the backplate 25. The cleaning nozzle 43 cleans in the first and second spraying areas, which can clean the inner wall surfaces of the backplate 25 and the panel 1.

[0046] The switchable air intake assembly of the present invention has a second cleaning position. In the second cleaning position, the cleaning nozzle 43 is located above the air intake 11. At this time, the exhaust fan is closed, the damper plate 32 is in the first position and the shielding surface blocks the air intake 11. The cleaning nozzle 43 rotates 360° and sprays cleaning medium to clean the exhaust fan and the inner wall of the air collection box 2. When the switchable air intake assembly of the present invention is applied to a range hood, during the operation of the range hood, the air guide opening 321 on the damper plate 32 corresponds to the air intake 11, the air intake 11 is opened, the exhaust fan is started, and external fumes enter the air collection box 2 through the air intake 11 on the panel 1, and are then discharged from the air collection box 2 by the exhaust fan located inside the air collection box 2. The exhaust fan is located above the air intake 11. After the fumes enter the air collection box 2, they flow towards the air inlet of the exhaust fan under the action of the exhaust fan, enter the housing of the exhaust fan, and are then discharged from the air collection box 2 by the exhaust fan. During the process of the exhaust fan sucking up the fumes, the spray assembly... Located in the first cleaning position, the user can activate the spray assembly to clean the shielding surface on the damper plate 32. While the spray assembly is cleaning the shielding surface of the damper plate 32, it will not affect the operation of the range hood. After the range hood finishes running and the exhaust fan is turned off, the drive device 33 can transport the cleaned damper plate 32 to the first section 311 of the guide rail 31 and move the damper plate 32 to the first position to close the air intake 11. The clean bulge 322 extends out from the air intake 11, and the shielding surface seen from the user's side is clean, which can keep the appearance of the range hood panel 1 clean and tidy.During the entire smoke extraction process, the fumes enter the air collection box 2 through the suction inlet 11 and then flow towards the exhaust fan. Since the exhaust fan is located above the suction inlet 11, the fumes flow upwards after entering the air collection box 2. Therefore, the oil and water mixture formed by the fumes in the air collection box 2 during the smoke extraction process mainly adheres to the inner wall surface of the back plate 25 of the air collection box 2 above the suction inlet 11, the inner wall surface of the panel 1 above the suction inlet 11, and the housing of the exhaust fan. When the oil and water mixture accumulates to a certain amount on the inner wall surface of the back plate 25 of the air collection box 2 above the suction inlet 11, the inner wall surface of the panel 1 above the suction inlet 11, and the housing of the exhaust fan, this oil and water mixture will flow from the inner wall surface of the back plate 25 of the air collection box 2 above the suction inlet 11 to the inner wall surface of the back plate 25 below the suction inlet 11. The flow occurs from the portion of the inner wall surface of panel 1 above the air intake 11 to the portion of the inner wall surface of panel 1 below the air intake 11. After the exhaust fan is turned off, the spray assembly moves to the second cleaning position. In the second cleaning position, the cleaning nozzle 43 sprays the cleaning medium and cleans the oil and water mixture on the portion of the inner wall surface of the air collection box 2 above the air intake 11, the portion of the inner wall surface of panel 1 above the air intake 11, and the housing of the exhaust fan. The cleaning medium mixed with the cleaned oil and water mixture flows along the portion of the inner wall surface of the back plate 25 of the air collection box 2 above the air intake 11 to the portion of the inner wall surface of the back plate 25 of the air collection box 2 below the air intake 11, and along the portion of the inner wall surface of panel 1 above the air intake 11 to the portion of the inner wall surface of panel 1 below the air intake 11, until the cleaning nozzle 43 spray assembly completes the cleaning operation in the second cleaning position.

[0047] The present invention relates to a switchable air intake assembly, wherein a water pump is connected to a cleaning nozzle 43 and a water supply pipe 42, a control valve is provided on the water supply pipe 42, and the water pump is connected to a water tank for storing cleaning medium. A connection port is provided between the cleaning nozzle 43 and the water supply pipe, and a switch valve is provided at each connection port. When the cleaning nozzle 43 is working, the water pump starts, the control valve opens, and the cleaning medium stored in the water tank is pumped into the water supply pipe 42. With the switch valve open at the connection port between the cleaning nozzle 43 and the water supply pipe 42, the cleaning nozzle 43 sprays the cleaning medium to clean the sprayed area.

[0048] Please see Figure 1The switchable air intake assembly of the present invention includes a rotation drive structure 47 comprising a rotation drive motor 471, an output shaft on the rotation drive motor 471, a first connecting rod 472 connected to the output shaft, a second connecting rod 473 connected to the water supply pipe 42, and a third connecting rod 474 hinged between the first connecting rod 472 and the second connecting rod 473. When the rotation drive structure 47 is in operation, the rotation drive motor 471 starts, and the output end of the rotation drive motor 471 drives the first connecting rod 472 to rotate at one end, causing the end of the first connecting rod 472 connected to the third connecting rod 474 to swing. The first connecting rod 472 drives the third connecting rod 474 to swing, causing the third connecting rod 474 to drive the end of the second connecting rod 473 connected to swing. The other end of the second connecting rod 473 is connected to the water supply pipe 42. The rotation of the other end of the second connecting rod 473 simultaneously drives the water supply pipe 42 to rotate, and the cleaning nozzle 43 rotates with the water supply pipe 42.

[0049] The switchable air intake assembly of the present invention includes a bracket assembly 46 comprising a left bracket and a right bracket. A water supply pipe 42 is rotatably connected to the left and right brackets and is made of a rigid material. A rotation drive structure 47 is fixed to either the left or right bracket. The bracket assembly 46 is positioned above the air intake 11. When the cleaning nozzle 43 needs to move from the first cleaning position to the second cleaning position or from the second cleaning position to the first cleaning position, the up-down drive structure 48 is activated, driving the bracket assembly 46 to slide along the guide structure 21. The water supply pipe 42 slides along the guide structure 21 with the bracket assembly 46, allowing the cleaning nozzle 43 to move between the first and second cleaning positions to clean the corresponding spray area. The bracket assembly 46 is positioned above the air intake 11. This means that after the bracket assembly 46 is slidably connected to the guide structure 21, the bracket assembly 46 does not contact the inner wall surface of the panel 1. There is a gap between the bracket assembly 46 and the air intake 11. This gap prevents the water supply pipe 42 from contacting the inner wall surface of the panel 1, thus avoiding clogging the liquid outlet of the cleaning nozzle 43. When the cleaning nozzle 43 sprays the cleaning medium onto the inner wall surface of the panel 1, the cleaning medium has room to flow.

[0050] Please see Figure 4 and Figure 5 In other embodiments, the cleaning device 4 includes a brush assembly comprising a rotating brush 41 facing the shielding surface. The rotating brush 41 has a resilient brush head that resiliently contacts and cleans the shielding surface. When the damper plate 32 moves to a third position on the guide rail 31, the shielding surface of the damper plate 32 faces the cleaning device 4, the cleaning device 4 is activated, the rotating brush 41 rotates, and the brush head resiliently contacts and cleans the shielding surface to clean it.

[0051] Please see Figure 4 , Figure 5 and Figure 7In the illustrated embodiment, the brush assembly further includes a fixed bracket 44 disposed within the air collection box 2, a rotating brush 41 disposed on the fixed bracket 44, and a brush rotation drive 45 disposed on the fixed bracket 44 capable of driving the rotating brush 41 to rotate relative to the fixed bracket 44. After the damper plate 32 moves along the guide rail 31 to the second section 312 of the guide rail 31, the damper plate 32 is inclined, with the shielding surface and the bulge 322 on the shielding surface facing the cleaning device 4. When the cleaning device 4 is activated, the brush rotation drive 45 drives the rotating brush 41 to rotate on the fixed bracket 44, so that the rotating brush 41 acts on the shielding surface of the damper plate 32, and the rotating brush 41 cleans the shielding surface of the damper plate 32.

[0052] Please see Figure 6 In some embodiments, the rotating brush 41 of the brush assembly includes a brush shaft and left and right brush bristles disposed on both sides of the brush shaft. The left and right brush bristles are symmetrically arranged relative to the brush shaft. When the cleaning device 4 is not activated, the left and right brush bristles are vertically distributed. When the cleaning device 4 is activated, the brush rotation drive 45 is activated and drives the rotating brush 41 to rotate around the fixed bracket 44. The rotating brush 41 presses against the wall of the receiving cavity, and the left and right brush bristles rub against the inner wall of the cleaning panel 1 located in the receiving cavity and the shielding surface of the damper plate 32.

[0053] Please see Figure 6 In another embodiment, the brush assembly further includes a brush up-and-down driving structure 49, the driving end of which is connected to a fixed bracket 44 for driving the fixed bracket 44 to move within the air collection box 2. Before the damper plate 32 moves onto the second section 312 of the guide rail 31, the brush up-and-down driving structure 49 moves the fixed bracket 44 below the air intake 11. After the damper plate 32 moves onto the second section 312 of the guide rail 31, the rotating brush 41 is located within the accommodating cavity formed by the damper plate 32 and the panel 1. After the damper plate 32 moves onto the first section of the guide rail 31 and closes the air intake 11, the brush up-and-down driving structure 49 drives the fixed bracket 44 to move within the air collection box 2 to clean the inner cavity of the air collection box 2.

[0054] Please see Figure 7 In the illustrated embodiment, the rotating brush 41 of the brush assembly includes a rotating shaft and scrapers evenly distributed on the rotating shaft. When the brush assembly is started, the brush rotation drive 45 is started and drives the rotating brush 41 to rotate around the fixed bracket 44. The scrapers press against the wall of the receiving cavity and scrape the oil stains on at least the shielding surface of the damper plate 32 downwards, cleaning the shielding surface of the damper plate 32.

[0055] Please see Figure 4In the illustrated embodiment, the cleaning device 4 includes a brush assembly and a spray assembly. The brush assembly only works with the spray assembly to clean the shielding surface of the damper plate 32 when the spray assembly is performing cleaning operations in the first cleaning position.

[0056] In other embodiments, the cleaning device 4 includes a brush assembly and a spray assembly. The brush assembly has a brush up-and-down driving structure 49. When the damper plate 32 closes the air intake 11, the brush up-and-down driving structure 49 drives the fixed bracket 44 to move within the air collection box 2. Simultaneously, the brush rotation drive 45 drives the rotating brush 41 to rotate and clean the inner wall of the air collection box 2. The inner wall of the air collection box 2 includes the inner wall of the back plate 25 of the air collection box 2, the inner wall of the panel 1, and the wall of the damper plate 2 away from the panel 1.

[0057] In some embodiments, the cleaning device 4 includes a brush assembly and a spray assembly. A scraper / brush is directly installed on the water supply pipe 42. While the rotation drive structure 47 drives the water supply pipe 42 to rotate, the scraper / brush and the cleaning nozzle 43 rotate with the water supply pipe 42. The water supply pipe 42 sprays cleaning medium, and the scraper / brush scrapes at least the shielding surface of the damper plate 32.

[0058] Please see Figure 4The present invention also discloses a range hood. The range hood disclosed in the present invention adopts the above-mentioned switchable air intake assembly and further includes an exhaust fan 5. When the exhaust fan 5 is closed, the drive device 33 drives the shielding surface of the damper plate 32 to block the air intake 11 so that the air intake 11 is closed. When the exhaust fan 5 is open, the air guide opening 321 corresponds to the air intake 11 so that the air intake 11 is opened. Or the damper plate 32 moves to a third position, the air intake 11 is opened, and at the same time the cleaning device 4 cleans the shielding surface. The range hood of the present invention includes an operating state and a cleaning state. When the range hood is turned on, the damper plate 32 moves to the second position, and the air guide opening 321 on the damper plate 32 corresponds to the air intake 11, opening the air intake 11. The exhaust fan 5 is started, and external fumes enter the air collection box 2 through the air intake 11 and the air guide opening 321 under the action of the exhaust fan 5, and are then discharged from the air collection box 2 by the exhaust fan 5. When the range hood is turned on, if it is necessary to clean the shielding surface on the damper plate 32, the damper plate 32 will move to the third position along the guide rail 31 under the action of the drive device 33. At this time, the damper plate 32 is located below the air intake 11, and a receiving cavity is formed between the damper plate 32 and the inner wall surface of the panel 1. The cleaning device 4 is placed in the receiving cavity, and the cleaning device 4 is started. The cleaning nozzle 43 of the spray assembly sprays towards the shielding surface and sprays onto the shielding surface. The cleaning medium is sprayed, and at the same time, the brush rotation drive 45 drives the rotating brush 41 to rotate, so that the rotating brush 41 cleans the shielding surface of the damper plate 32. When the range hood is in the cleaning state, the exhaust fan 5 is turned off, and the damper plate 32 moves to the first section 311 of the guide rail 31 under the action of the drive device 33 and is in the first position. At this time, the shielding surface of the damper plate 32 closes the air intake 11, and the bulge 322 on the shielding surface extends into the air intake 11 and forms the appearance surface of the panel 1. The cleaning device 4 is started, and the upper and lower drive structure 48 of the spray assembly drives the bracket assembly 46 to slide along the guide structure 21, so that the water supply pipe 42 moves up and down with the bracket assembly 46. At the same time, the rotation drive structure 47 drives the water supply pipe 42 to rotate, and the cleaning nozzle 43 rotates with the water supply pipe 42 and sprays the cleaning medium to clean the inner wall of the entire air collection box.

[0059] In an embodiment where the brush assembly has a brush up-and-down drive structure 49, when the range hood is in the cleaning state, the brush up-and-down drive structure 49 drives the fixed bracket 44 to move within the air collection box 2, and the brush rotation drive component 45 rotates the rotating brush 41, causing the rotating brush 41 to rotate relative to the fixed bracket 44, thereby assisting the spray assembly in cleaning the inner wall of the air collection box 2, so that the inner wall of the air collection box 2 is cleaned more thoroughly.

[0060] Please see Figure 4 In the illustrated embodiment, when the range hood is in the on-cleaning state, the brush assembly is in the off state, and the spray assembly moves within the air collection box 2 to clean the inner wall of the air collection box 2.

[0061] The range hood of the present invention includes a third spraying area corresponding to the area where the exhaust fan 5 is located in the spraying area of ​​the spraying component. When the water supply pipe 42 rotates, the cleaning nozzle 43 can spray the inner wall surface of the panel 1, the inner wall surface of the back plate 25 and the exhaust fan 5. When the range hood is working, the exhaust fan 5 starts. External fumes enter the air collection box 2 through the air intake 11 on the panel 1 of the range hood, and are then discharged from the air collection box by the exhaust fan 5. The exhaust fan 5 is located above the air intake 11. After the fumes enter the air collection box 2, they flow towards the air inlet of the exhaust fan 5 under the action of the exhaust fan 5. During the flow towards the exhaust fan 5, part of the airflow formed by the fumes will directly enter the housing of the exhaust fan 5 through the air inlet of the exhaust fan 5, and the other part will rush onto the back plate 25, and then flow along the back plate 25 towards the air inlet of the exhaust fan 5, and then enter the housing of the exhaust fan 5, and finally be discharged from the air collection box 2 by the exhaust fan 5. During the entire smoke extraction process, the fumes enter the air collection box 2 through the suction inlet 11 and then flow towards the exhaust fan 5. Since the exhaust fan 5 is located above the suction inlet 11, the fumes flow upwards after entering the air collection box 2. Therefore, the oil and water mixture formed by the fumes in the air collection box 2 during the smoke extraction process mainly adheres to the inner wall surface of the back plate 25 above the suction inlet 11, the inner wall surface of the panel 1 above the suction inlet 11, and the housing of the exhaust fan 5. When the oil and water mixture accumulates to a certain amount on the inner wall surface of the back plate 25 above the suction inlet 11, the inner wall surface of the panel 1 above the suction inlet 11, and the housing of the exhaust fan 5, this oil and water mixture will flow along the inner wall surface of the back plate 25 above the suction inlet 11 to the part of the inner wall surface of the back plate 25 below the suction inlet 11, and the inner wall surface of the panel 1 above the suction inlet 11... Part of the airflow flows to the inner wall of panel 1 below the air intake 11 and downwards through the housing of exhaust fan 5. Therefore, the spraying area of ​​the spray assembly includes a first spraying area corresponding to the inner wall of panel 1 of the range hood, a second spraying area corresponding to the inner wall of back panel 25, and a third spraying area corresponding to the area where exhaust fan 5 is located. When the cleaning nozzle 43 is in the second cleaning position, it is located above the air intake 11 and cleans the portions of the first and second spraying areas above the air intake 11 and the third spraying area. When the cleaning nozzle 43 is in the first cleaning position, it is located below the air intake 11 and cleans the portions of the first and second spraying areas below the air intake 11. This can clean the entire inner wall of back panel 25 of the air collection box 2, the inner wall of panel 1, and exhaust fan 5.

[0062] Please see Figure 3 and Figure 4The range hood of the present invention also includes a PM2.5 detection module 6 capable of real-time detection of ambient air quality and a display control device 7 capable of displaying its detection data. The damper assembly 3, the cleaning device 4, the exhaust fan 5, and the PM2.5 detection module 6 are all electrically connected to the display control device 7. When the detection value of the PM2.5 detection module 6 reaches the set range, the display control device 7 sends a start command to the exhaust fan 5 and the damper assembly 3. The drive device 33 drives the damper 32 to slide to the second position, the air intake 11 opens, and the exhaust fan 5 enters the running state. Alternatively, when the detection value of the PM2.5 detection module 6 reaches the set range, the display control device 7 sends a start command to the exhaust fan 5, the damper assembly 3, and the cleaning device 4. The drive device 33 drives the damper 32 to slide to the third position, the air intake 11 opens, the exhaust fan 5 enters the running state, and the cleaning device 4 cleans the shielding surface of the damper 32. In the range hood of the present invention, when the range hood is in the off state, the damper assembly 3 covers the air intake vent 11; after the range hood is turned on, the PM2.5 detection module 6 starts first, detects the air quality of the working environment, and sends the detection data to the display control device 7. The display control device 7 displays the data detected by the PM2.5 detection module 6 and determines whether the detection value of the PM2.5 detection module 6 reaches the set range. When the set range is reached, the display control device 7 sends a start command to the exhaust fan 5 and the damper assembly 3. The drive device 33 of the damper assembly 3 starts and drives the damper 32 to slide along the guide rail 31 and move to the second position. The air guide opening 321 is aligned with the air intake 11, the air intake 11 opens, and the exhaust fan 5 enters the running state. Under the action of the exhaust fan 5, external oil fumes enter the air collection box 2 through the air intake 11, and are then discharged from the air collection box 2 by the exhaust fan 5. When the exhaust fan 5 is working, the PM2.5 detection module... Block 6 monitors the surrounding air quality in real time and sends the data to the display control device 7. If the user needs the cleaning device 4 to clean the shielding surface of the damper plate 32, the user can restart the drive device 33 via the display control device 7 to move the damper plate 32 to the third position. At the same time, the display control device 7 will start the cleaning device 4 to clean the shielding surface of the damper plate 32. When the PM2.5 detection module 6 detects a value lower than the minimum value of the set range, the display control device 7 will send power to the exhaust fan 5 and the drive device 33. The drive device 33 sends a shutdown command, and the exhaust fan 5 enters the shutdown state. The drive device 33 drives the damper plate 32 to slide along the guide rail 31, from the second section 312 of the guide rail 31 to the first section 311. When the damper plate 32 moves to the first position on the first section 311, the bulge part 322 extends out of the air intake 11 and covers the air intake 11. At this time, if the user needs the cleaning device 4 to clean the inner cavity of the air collection box 2, the user starts the cleaning device 4 through the display control device 7 to clean the inner cavity of the air collection box 2.

[0063] Please see Figure 3 and Figure 4 The range hood of the present invention has an oil drain hole 22 at the bottom of the air collection box 2 and an oil cup 23 for receiving the oil flowing out of the oil drain hole 22. The oil cup 23 is equipped with a liquid level sensor. When the damper plate 32 is in the first position and the air intake 11 is closed, the cleaning device 4 is started and cleans the exhaust fan 5 and the inner wall of the air collection box 2. The cleaning device 4 adjusts the spraying time according to the amount of oil collected in the oil cup 23. The cleaning device 4 stops operating after the spraying time is reached. When the spraying component is located between the damper plate 32 and the inner wall of the panel 1, the cleaning device 4 stops operating after working for 1-5 minutes. When the cleaning device 4 is working, the cleaning medium sprayed by the spray assembly and the mixture of oil and water washed off flow downwards along the inner wall of the back plate 25 of the air collection box 2, the inner wall of the panel 1, the damper plate 32, and the housing of the exhaust fan 5, and drip down to the bottom of the air collection box 2. Then, it drips down through the oil drain hole 22 at the bottom of the air collection box 2 and is collected by the oil cup 23 at the bottom of the air collection box 2. When the spray assembly is in the second cleaning position, the cleaning range is relatively large. As long as the liquid level sensor in the oil cup 23 does not alarm the control system, the spray assembly will continue to work and clean the oil stains in the spray area. When the oil stains collected in the oil cup 23 reach the warning amount of the liquid level sensor, the liquid level sensor alarms the control system, and the control system adjusts the spraying time of the spray assembly to prevent the oil stains in the oil cup 23 from overflowing. When the spray assembly enters the first cleaning position, the spray assembly cleans the shielding surface of the damper plate 32 and the inner wall surface of the panel 1 located below the air intake 11. The cleaning range is relatively small. At this time, the spray assembly stops operating after spraying for 1-5 minutes, which can clean the shielding surface of the damper plate 32 and the inner wall surface of the panel 1 located below the air intake 11.

[0064] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A switchable air intake assembly for use in a range hood, characterized in that, include: Panel (1), on which an air intake (11) is provided; An air collection box (2) is connected to the air intake (11); The damper assembly (3) includes a guide rail (31), a damper plate (32) and a drive device (33) disposed in the air collection box (2). The guide rail (31) is disposed along the inner wall of the panel (1). The damper plate (32) is provided with a shielding surface and an air guide opening (321). The damper plate (32) has a first position, a second position and a third position on the guide rail (31). The drive device (33) drives the damper plate (32) to move between any two of the first position, the second position and the third position. A cleaning device (4) is installed on the inner wall of the air collection box (2); When the damper plate (32) is in the first position, the shielding surface blocks the air intake (11), the air intake (11) is closed, and the shielding surface becomes the outer surface of the panel (1); when the damper plate (32) is in the second position, the air guide opening (321) corresponds to the air intake (11), the air intake (11) is opened and used for air intake; when the damper plate (32) is in the third position, the shielding surface of the damper plate (32) faces the cleaning device (4), and the cleaning device (4) cleans the shielding surface; the shielding surface is provided with a bulge (322) protruding towards the air intake (11), the bulge (322) is adapted to the air intake (11), and the damper plate (32) in the first position... When in position, the bulge (322) extends into the air intake (11) and the top surface of the bulge (322) is flush with the outer side of the panel (1); the guide rail (31) includes a first direction section (311) and a second direction section (312); when the damper plate (32) slides on the first direction section (311), the damper plate (32) switches between the first position and the second position; the bulge (322) extends out from the air intake (11) or the air guide opening (321) corresponds to the air intake (11); when the damper plate (32) slides on the second direction section (312) of the guide rail (31) and moves to the third position, the damper plate (32) is tilted; the cleaning device (4) cleans the bulge (322).

2. The switchable air intake assembly according to claim 1, characterized in that, The guide rail (31) has an angle connecting the second position and the third position, the angle causing the damper plate (32) to move away from the panel (1) and form an angle of 15°-45° with the inner wall surface of the panel (1) when it is in the third position.

3. The switchable air intake assembly according to claim 1, characterized in that, The cleaning device (4) includes a brush assembly comprising a rotating brush (41) facing the shielding surface, the rotating brush (41) having a resilient brush head that resiliently contacts and cleans the shielding surface; or / and the cleaning device (4) includes a spray assembly comprising a water supply pipe (42) and cleaning nozzles (43) facing the shielding surface, the water supply pipe (42) being horizontally arranged along the shielding surface, and a plurality of the cleaning nozzles (43) being spaced apart along the water supply pipe (42).

4. The switchable air intake assembly according to claim 3, characterized in that, The brush assembly also includes a fixed bracket (44) disposed in the air collection box (2), the rotating brush (41) is disposed on the fixed bracket (44), and the fixed bracket (44) is provided with a brush rotation drive (45) capable of driving the rotating brush (41) to rotate relative to the fixed bracket (44).

5. The switchable air intake assembly according to claim 3, characterized in that, The spray assembly also includes a support assembly (46) disposed on the inner wall of the air collection box (2), the water supply pipe (42) is disposed on the support assembly (46), and the support assembly (46) is provided with a rotation drive structure (47) capable of driving the water supply pipe (42) to rotate; the inner wall of the air collection box (2) is also provided with a guide structure (21) capable of allowing the support assembly (46) to slide, and the guide structure (21) is provided with an up-down drive structure (48) for driving the support assembly (46) to slide along the guide structure (21).

6. The switchable air intake assembly according to claim 5, characterized in that, The spray assembly has a first cleaning position and a second cleaning position. In the first cleaning position, the spray assembly is located between the damper plate (32) and the inner wall of the panel (1). At this time, the damper plate (32) is in the third position, the air intake (11) is open, the exhaust fan of the range hood is running, and the spray assembly cleans the shielding surface. In the second cleaning position, the spray assembly is located above the air intake (11). At this time, the exhaust fan of the range hood is closed, the damper plate (32) is in the first position and the shielding surface blocks the air intake (11). The cleaning nozzle (43) rotates 360° and sprays cleaning medium to clean the exhaust fan of the range hood and the inner wall of the air collection box (2).

7. A range hood, employing the switchable air intake assembly according to any one of claims 1 to 6, characterized in that, It also includes a smoke exhaust fan (5). When the smoke exhaust fan (5) is closed, the driving device (33) drives the shielding surface of the damper plate (32) to block the air intake (11) so that the air intake (11) is closed. When the smoke exhaust fan (5) is open, the air guide opening (321) corresponds to the air intake (11) so that the air intake (11) is opened. Or the damper plate (32) moves to the third position, the air intake (11) is opened, and at the same time the cleaning device (4) cleans the shielding surface.

8. The range hood according to claim 7, characterized in that, It also includes a PM2.5 detection module (6) capable of real-time detection of ambient air quality and a display control device (7) capable of displaying its detection data. The damper assembly (3), the cleaning device (4), the exhaust fan (5), and the PM2.5 detection module (6) are all electrically connected to the display control device (7). When the detection value of the PM2.5 detection module (6) reaches the set range, the display control device (7) sends a start command to the exhaust fan (5) and the damper assembly (3), and the drive device (33) drives the damper (32). When the air inlet (11) is slid to the second position, the exhaust fan (5) is opened and the exhaust fan (5) enters the running state; or when the detection value of the PM2.5 detection module (6) reaches the set range, the display control device (7) sends a start command to the exhaust fan (5), the damper assembly (3) and the cleaning device (4), the drive device (33) drives the damper (32) to slide to the third position, the air inlet (11) is opened, the exhaust fan (5) enters the running state, and the cleaning device (4) cleans the shielding surface of the damper (32).

9. The range hood according to claim 7, characterized in that, The bottom of the air collection box (2) is provided with an oil leakage hole (22) and an oil cup (23) for receiving the oil spillage from the oil leakage hole (22). The oil cup (23) is provided with a liquid level sensor. When the damper plate (32) is in the first position and the air intake (11) is closed, the exhaust fan (5) is turned off. The cleaning device (4) is started and cleans the exhaust fan (5) and the inner wall of the air collection box (2). The cleaning device (4) adjusts the spraying time according to the amount of oil collected in the oil cup (23). The cleaning device (4) stops operating after the spraying time is reached.

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