A bellows assembly and a range hood having the same

Abstract

The present application relates to the technical field of range hood, and discloses a wind box assembly and a range hood with the same. The wind box assembly comprises a panel, a wind collecting box, an opening and closing air suction port assembly and a cleaning device. The opening and closing air suction port assembly is used for opening or closing the air suction port. A shielding surface capable of closing the air suction port is arranged on the opening and closing air suction port assembly. The cleaning device has a first cleaning position. In the first cleaning position, the shielding surface faces the cleaning device, the air suction port is open, and the exhaust fan is turned on. Compared with the prior art, the wind box assembly can reduce the entry of external dust into the wind collecting box and the generation of dirt adhered to the inner wall surface of the inner cavity of the wind collecting box when the range hood is turned off. When the cleaning device is in the first cleaning position, the cleaning device cleans the shielding surface. Thus, the shielding surface is clean when it closes the air suction port from the user side, and the appearance of the panel side of the range hood can be kept clean and tidy.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, specifically to a fan 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 to reduce pollution and purify 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, the fumes are exhausted through 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 of the collection box, 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 when cleaning the range hood. Summary of the Invention

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

[0004] A fan assembly for a range hood, comprising:

[0005] The panel has an air intake vent.

[0006] An air collection box is connected to the air intake, and an exhaust fan is installed inside the air collection box;

[0007] An air intake switch assembly is located inside the air collection box and is used to open or close the air intake. The air intake switch assembly is provided with a shielding surface that can close the air intake and form the appearance surface of the panel when the air intake is closed.

[0008] A cleaning device is installed on the inner wall of the air collection box. The cleaning device has a first cleaning position. In the first cleaning position, the shielding surface faces the cleaning device, and the cleaning device cleans the shielding surface. The air intake is opened and the exhaust fan is turned on.

[0009] According to one embodiment of the present invention, when the air inlet assembly is closed, the shielding surface is pressed against the extrusion panel; when the air inlet assembly is opened, a receiving cavity is formed between the shielding surface and the panel to accommodate the cleaning device. In the first cleaning state, the cleaning device cleans the shielding surface in the receiving cavity, and the exhaust fan operates and forms a negative pressure airflow at the air inlet to prevent water generated by the cleaning device from splashing outward from the air inlet.

[0010] According to one embodiment of the present invention, the switchable air intake assembly includes a guide rail, an air damper plate, and a drive device disposed in an air collection box. A shielding surface is disposed on the air damper plate, and the shielding surface has a bulge protruding in the direction of the air intake. The bulge is adapted to the air intake. The guide rail includes a first direction section and a second direction section. When the air damper plate is in the first direction section, the bulge protrudes from the air intake. When the air damper plate is in the second direction section, the air damper plate is inclined. A cleaning device can clean the bulge. The drive device drives the air damper plate to move between the first direction section and the second direction section.

[0011] According to one embodiment of the present invention, a horizontally arranged fixed shaft is provided inside the air collection box, and a driving device is arranged on the fixed shaft. The driving end of the driving device is fixedly connected to the lower end of the damper plate and can drive the damper plate to slide on the guide rail. Bearings that can slide on the guide rail are provided on both sides of the damper plate, and shock-absorbing components are sleeved on the bearings.

[0012] According to one embodiment of the present invention, the cleaning device includes a support assembly disposed on the inner wall of the air collection box and a water supply pipe disposed on the support assembly. The water supply pipe is provided with a spray assembly facing one side. The support assembly is provided with a rotation drive structure capable of driving the water supply pipe to rotate. The inner wall of the air collection box is also provided with a guide structure capable of allowing the support assembly to slide. The guide structure is provided with an up-down drive structure for driving the support assembly to slide along the guide structure.

[0013] According to one embodiment of the present invention, the cleaning device further has a second cleaning position. In the first cleaning position, the air intake is open and the exhaust fan is turned on, and the spray assembly cleans the shielding surface. In the second cleaning position, the air intake is closed on the shielding surface, the spray assembly is located above the air intake, the exhaust fan is turned off, the spray assembly rotates 360° and sprays cleaning medium to clean the exhaust fan and the inner wall of the air collection box.

[0014] According to one embodiment of the present invention, the spray assembly includes a plurality of nozzles evenly distributed on a water supply pipe, the water supply pipe is connected to a water pump, a control valve is provided on the water supply pipe, the water pump is connected to a water tank for storing cleaning medium, a connection port is provided between the nozzles and the water supply pipe, and a switch valve is provided at each connection port.

[0015] According to one embodiment of the present invention, the rotation drive structure includes a rotation drive motor, an output shaft is provided on the rotation drive motor, a first connecting rod is connected to the output shaft, a second connecting rod is connected to the water supply pipe, and a third connecting rod is hinged between the first connecting rod and the second connecting rod.

[0016] A range hood, employing the aforementioned air box assembly, further includes a brush assembly disposed within a receiving cavity. The brush assembly includes a fixed bracket and a brush disposed on the fixed bracket for cleaning the shielding surface. The fixed bracket is provided with a brush rotation drive component capable of driving the brush to rotate relative to the fixed bracket.

[0017] 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 inside the oil cup; the cleaning device is provided with a first cleaning position and a second cleaning position. In the second cleaning position, the cleaning device is located above the air intake, the exhaust fan is turned off, the air intake is blocked, the cleaning device cleans the exhaust fan and the inner wall of the air collection box, and the cleaning device adjusts the spraying time according to the amount of oil collected in the oil cup. The cleaning device stops operating after the spraying time is reached.

[0018] Compared with the prior art, the bellows assembly of the present invention has the following advantages:

[0019] The air box assembly of the present invention, when the range hood is turned off, closes the air inlet assembly, which can reduce the entry of external dust into the air collection box and reduce the generation of dirt adhering to the inner wall surface of the air collection box. Furthermore, when the cleaning device is in the first cleaning position, the cleaning device cleans the shielding surface, so that when the air inlet is closed, 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

[0020] Figure 1 A schematic diagram of the structure of a range hood with the air box assembly of the present invention after the back panel has been removed;

[0021] Figure 2 An exploded view of the damper plate assembly of the bellows assembly of the present invention;

[0022] Figure 3 This is a front view of a range hood having the bellows assembly of the present invention;

[0023] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0024] Figure 5 for Figure 4 A magnified view of part B in the image;

[0025] Figure 6This is an exploded view of one embodiment of the brush assembly of the range hood of the present invention;

[0026] Figure 7 This is an exploded view of another embodiment of the brush assembly of the range hood of the present invention;

[0027] In the diagram: 1. Panel, 11. Air intake, 2. Air collection box, 21. Fixed shaft, 22. Guide structure, 23. Oil drain hole, 24. Oil cup, 25. Back plate, 3. Exhaust fan, 4. Air intake switch assembly, 41. Guide rail, 411. First section, 412. Second section, 42. Air damper, 421. Bulging part, 422. Washer, 43. Drive device, 44. Bearing, 45. Shock absorber, 5. Cleaning device, 5 1. Support assembly; 52. Water supply pipe; 53. Sprinkler assembly; 54. Rotary drive structure; 541. Rotary drive motor; 542. First connecting rod; 543. Second connecting rod; 544. Third connecting rod; 55. Up and down drive structure; 6. Brush assembly; 61. Fixed bracket; 62. Brush; 63. Brush rotation drive component; 64. Brush up and down drive structure; 7. PM2.5 detection module; 8. Display and control device.

[0028] 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

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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:

[0033] This invention discloses a bellows assembly; please refer to [link / reference]. Figure 1 and Figure 2The air box assembly disclosed in this invention is used in a range hood, including a panel 1, an air collection box 2, a switchable air intake assembly 4, and a cleaning device 5. The panel 1 is provided with an air intake 11; the air collection box 2 is connected to the air intake 11, and an exhaust fan 3 is provided inside the air collection box 2; the switchable air intake assembly 4 is located inside the air collection box 2 and is used to open or close the air intake 11. The switchable air intake assembly 4 is provided with a shielding surface that can close the air intake 11 and forms the outer surface of the panel 1 when the air intake 11 is closed; the cleaning device 5 is located on the inner wall of the air collection box 2, and the cleaning device 5 has a first cleaning position. In the first cleaning position, the shielding surface faces the cleaning device 5, and the cleaning device 5 cleans the shielding surface. The air intake 11 is opened and the exhaust fan 3 is turned on. When the air box assembly of the present invention is applied to a range hood, during the operation of the range hood, the shielding surface of the air inlet switch assembly 4 is offset from the air inlet 11, the air inlet 11 is opened, and after the exhaust fan 3 is started, external fumes begin to enter the air collection box 2 through the air inlet 11. The fumes entering the air collection box 2 flow towards the exhaust fan 3 and are discharged from the air collection box 2 by the exhaust fan 3. After the exhaust fan 3 is turned off, the air inlet switch assembly 4 closes the air inlet 11. The shielding surface on the air inlet switch assembly 4 blocks the air inlet 11, and the air inlet is closed. The shielding surface on the air inlet switch assembly 4 forms the appearance surface of the panel 1, preventing ambient air from entering through the air inlet when the range hood is turned off. The air enters the air collection box 2 through the inlet 11. Dust in the air will 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 formation 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 3 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 below air collection box 2 and is collected. When the air intake 11 is closed by the shielding surface on the air intake assembly 4, and the portion of the shielding surface corresponding to the air intake 11 forms the appearance surface of the panel 1, the user can see the shielding surface 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 mixture of oil and water 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, a cleaning device 5 is provided on the inner wall of the air collection box 2, and the cleaning device 5 has a first cleaning position. In the first cleaning position, the shielding surface faces the cleaning device 5, and the cleaning device 5 cleans the shielding surface, cleaning the shielding surface clean. In this way, when the air intake 11 is closed by the shielding surface and the appearance surface of the panel 1 is formed, the shielding surface seen from the user side is clean, which can keep the appearance surface of the panel side of the range hood clean and tidy.Furthermore, when the cleaning device 5 is in the first cleaning position, the shielding surface faces the cleaning device 5, the air intake 11 is open and the exhaust fan 3 is turned on. That is to say, when the cleaning device 5 cleans the shielding surface, it will not affect the operation of the exhaust fan 3. After the range hood finishes running and the exhaust fan 3 is turned off, the air intake assembly 4 closes the air intake 11. The clean shielding surface closes the air intake 11 to form the appearance surface of the panel 1. The shielding surface seen from the user side is clean, which can keep the appearance surface of the range hood panel 1 clean and tidy.

[0034] In the bellows assembly of the present invention, when the air intake 11 is closed by the switch air intake assembly 4, the shielding surface is pressed against the compression panel 1; when the air intake 11 is opened by the switch air intake assembly 4, a receiving cavity is formed between the shielding surface and the panel 1 to accommodate the cleaning device 5. In the first cleaning state, the cleaning device 5 cleans the shielding surface in the receiving cavity, and the exhaust fan 3 runs and forms a negative pressure airflow at the air intake 11 to prevent the water generated by the cleaning device 5 from splashing outward from the air intake 11. After the exhaust fan 3 starts, the suction port assembly 4 closes the suction port 11. The outer surface of the shielding surface corresponding to the suction port 11 is pressed tightly against the panel 1, so that there is no gap between the shielding surface and the suction port 11. This prevents external air from entering the air collection box 2 through the gap between the shielding surface and the suction port 11, and prevents external dust from entering the air collection box 2 with the external air and mixing with the oil and water mixture to form dirt. When the exhaust fan 3 starts, the suction port assembly 4 opens the suction port 11. At this time, a receiving cavity is formed between the shielding surface of the suction port assembly 4 and the panel 1. There is a gap between the shielding surface and the panel 1. The cleaning device 5 is placed in the receiving cavity, with the shielding surface facing the cleaning device 5. When the cleaning device starts and cleans the shielding surface, the cleaning device 5 sprays cleaning medium onto the shielding surface. On the surface, the cleaning medium is used to rinse the shielding surface to clean the oil stains on the shielding surface. When the cleaning device 5 sprays the cleaning medium onto the shielding surface, the cleaning medium will generate splashing water droplets when it is sprayed onto the shielding surface. The water droplets will splash from the gap between the shielding surface and the inner wall surface of the panel 1. At this time, because the exhaust fan 3 is running and a negative pressure is formed at the air intake 11, the negative pressure draws the air outside the panel 1 into the air collection box 2 through the air intake 11. Therefore, when the cleaning device 5 cleans the shielding surface, the water droplets generated by the cleaning medium enter the gap between the inner wall surface of the panel 1 and the shielding surface. Under the action of the air flow entering through the air intake 11, they will fall into the air collection box 2 and will not splash out from the air intake 11. This can prevent the cleaning medium from flying out from the air intake 11 and falling into the food being cooked.

[0035] Please see Figure 2The air box assembly of the present invention includes an air intake opening switch assembly 4 comprising a guide rail 41 disposed within an air collection box 2, an air damper plate 42 slidably connected to the guide rail 41, and a drive device 43. A shielding surface is disposed on the air damper plate 42, and the drive device 43 drives the air damper plate 42 to move on the guide rail 41. When the exhaust fan 3 is off, the drive device 43 is activated, driving the air damper plate 42 to slide along the guide rail 41, causing the shielding surface on the air damper plate 42 to shield the air intake opening 11, thereby closing the air intake opening 11. When the exhaust fan 3 is activated, the drive device 43 is activated, driving the air damper plate 42 to slide along the guide rail 41, causing the shielding surface on the air damper plate 42 to move away from the air intake opening 11, opening the air intake opening 11, allowing external fumes to enter the air collection box 2 through the air intake opening 11 under the action of the exhaust fan 3. When the exhaust fan 3 is activated, the cleaning device 5 is positioned in the first cleaning position and cleans the shielding surface on the air damper plate 42. It should be understood that the shielding surface of the damper plate 42 is the side of the damper plate 42 facing the air intake 11 on the panel 1. When it is necessary to close the air intake 11, the drive device 43 drives the damper plate 42 to move on the guide rail 41, and the shielding surface presses against the panel 1 and closes the air intake 11. When the shielding surface closes the air intake 11, the shielding surface forms the appearance surface of the panel 1.

[0036] Furthermore, since the damper plate 42 is located inside the air collection box 2, and the panel 1 has thickness, even when the damper plate 42 closes the air intake 11, and the shielding surface of the damper plate 42 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. 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 the user to clean. Please refer to [link / reference]. Figures 3 to 5 The bellows assembly of the present invention has a bulge 421 protruding towards the air intake 11 on the shielding surface, and the bulge 421 is adapted to the air intake 11. When the shielding surface covers the air intake 11, the bulge 421 extends into the air intake 11 and the top surface of the bulge 421 is flush with the outer side surface of the panel 1 to form the outer surface of the panel 1. The top surface of the bulge 421 and the outer side surface of the panel 1 are located on the same plane, which makes it convenient for users to clean the panel 1 of the range hood and also keeps the outer surface of the panel 1 smooth and intact.

[0037] Please see Figure 2In the bellows assembly of the present invention, the guide rail 41 includes a first section 411 and a second section 412. When the damper plate 42 is in the first section 411, the bulge portion 421 extends from the air intake 11; when the damper plate 42 is in the second section 412, the damper plate 42 is inclined. The cleaning device 5 can clean the bulge portion 421. The driving device 43 drives the damper plate 42 to move between the first section 411 and the second section 412. The first section 411 and the second section 412 of the guide rail 41 are on different planes. When the first section 411 is close to the inner wall surface of the panel 1, there is a gap between the second section 412 and the inner wall surface of the panel 1. Thus, when the damper plate 42 slides on the first section 411 of the guide rail 41, the bulge portion 421 on the damper plate 42 can extend from the air intake 11 to close the air intake 11; when the driving device 43 drives the damper plate 42 from the first section 411 to the second section 412... At time 412, the damper plate 42 moves below the air intake 11. At this time, the damper plate 42 is tilted and does not adhere tightly to the inner wall of the panel 1. The bulge 421 on the shielding surface of the damper plate 42 also does not adhere tightly to the inner wall of the panel 1. A receiving cavity is formed between the damper plate 42 and the inner wall of the panel 1. The cleaning device 5 can be placed in the receiving cavity and clean the bulge 421 so that when the bulge 421 is inserted into the air intake 11, the outer surface of the panel 1 remains clean.

[0038] When the damper plate 42 is located on the second section 412 of the guide rail 41, the air intake 11 on the panel 1 is open, the exhaust fan 3 starts and runs, the damper plate 42 is tilted and its lower end extends towards the back plate of the air collection box 2. The greater the tilt angle of the damper plate 42, the smaller the distance from its lower end to the back plate of the air collection box 2, and the easier it is for the mixture of oil and water on the exhaust fan in the air collection box 2 to drip onto the damper plate 42; conversely, the smaller the tilt angle of the damper plate 42, the greater the distance from its lower end to the back plate of the air collection box 2, and the easier it is for the exhaust fan in the air collection box 2 to drip onto the damper plate 42. The less likely the oil and water mixture on the fan will drip onto the damper plate 42, the less likely it is to drip onto the damper plate 42. However, if the tilt angle of the damper plate 42 is too small, the gap between the damper plate 42 and the panel 1 will not be enough to accommodate the cleaning device 5. Therefore, the tilt angle of the damper plate 42 is set to 10°-30°, which can ensure that the gap between the damper plate 42 and the panel 1 is sufficient to accommodate the cleaning device 5, and that there is still a gap between the bulge 421 and the panel 1, while preventing the damper plate 42 from affecting the oil and water mixture on the exhaust fan 3 in the air collection box 2 from dripping to the bottom of the air collection box 2.

[0039] Please see Figure 2 and Figure 5In the bellows assembly of the present invention, a deformable gasket 422 is provided on the side wall of the bulge portion 421. When the damper plate 42 blocks the air intake 11, the damper plate 42 is close to the panel 1, the bulge portion 421 extends into the air intake 11 and closes the air intake 11, the top surface of the bulge portion 421 is flush with the outer side surface of the panel 1, and the gasket 422 on the side wall of the bulge portion 421 is pressed together with the side wall surface of the air intake 11 and seals the air intake 11, so that the bulge portion 421 can seal the air intake 11 tightly.

[0040] Please see Figure 1 In the bellows assembly of the present invention, a horizontally arranged fixed shaft 21 is provided inside the bellows box 2, and a drive device 43 is mounted on the fixed shaft 21. The drive end of the drive device 43 is fixedly connected to the lower end of the damper plate 42 and can drive the damper plate 42 to slide up and down. Bearings 44 that can slide on the guide rail 41 are provided on both sides of the damper plate 42, and shock absorbers 45 are sleeved on the bearings 44. When the drive device 43 is started, the drive device 43 drives the damper plate 42 to slide along the guide rail 41 and rise or fall relative to the air inlet 11. When the damper plate 42 slides along the guide rail 41, the bearings 44 on both sides of the damper plate 42 slide along the guide rail 41, which can reduce the friction between the damper plate 42 and the guide rail 41. Furthermore, since the bearings 44 are provided with shock absorbers 45, the shock absorbers 45 can reduce the vibration generated when the bearings 44 slide along the guide rail 41, making the sliding of the damper plate 42 driven by the drive device 43 along the guide rail 41 more stable.

[0041] In some embodiments, the drive device 43 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 42, 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 42 to slide along the guide rail 41.

[0042] In some embodiments, the drive device 43 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 42. 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 42 to slide along the guide rail 41.

[0043] Please see Figure 1 and Figure 2 In the illustrated embodiment, the drive device 43 is an electric push rod, the drive end of which is connected to the damper plate 42. When the electric push rod is started, it drives the damper plate 42 to slide along the guide rail 41.

[0044] Please see Figure 1The bellows assembly of the present invention includes a cleaning device 5 comprising a support assembly 51 disposed on the inner wall of the bellows 2 and a water supply pipe 52 disposed on the support assembly 51. The water supply pipe 52 is provided with a spray assembly 53 facing one side. The support assembly 51 is provided with a rotation drive structure 54 capable of driving the water supply pipe 52 to rotate. The inner wall of the bellows 2 is also provided with a guide structure 22 capable of allowing the support assembly 51 to slide. The guide structure 22 is provided with an up-down drive structure 55 for driving the support assembly 51 to slide along the guide structure 22.When the air box assembly of the present invention is applied to a range hood, during the operation of the range hood, the drive device 43 drives the damper plate 42 to move on the guide rail 41, causing the damper plate 42 to move onto the second section 412 of the guide rail 41. At this time, the damper plate 42 is located below 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. 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. During the process of the exhaust fan 3 starting and sucking up the fumes, the cleaning device 5 is in the first cleaning position, and the rotation drive structure 54 and the up and down drive structure are activated. When the exhaust fan is not running, the externally supplied cleaning medium enters the water supply pipe 52 and is delivered to the spray assembly 53 through the water supply pipe 52. The spray assembly 53 sprays the cleaning medium toward the shielding surface of the damper plate 42 and cleans the shielding surface of the damper plate 42. After the exhaust fan is turned off, the drive device 43 drives the damper plate 42 to move on the guide rail 41, so that the damper plate 42 moves from the second direction section 412 of the guide rail to the first direction section 411. The shielding surface on the damper plate 42 blocks the air intake 11, and the bulge 421 extends into the air intake 11 and closes the air intake 11. At this time, the cleaning device 5 starts and can continue to operate in the first cleaning position. At this time, the drive structure 5 is rotated. 4. The water supply pipe 52 is operated and driven to rotate around the support assembly 51. The water supply pipe 52 drives the spray assembly 53 on it to rotate. When the cleaning medium is delivered to the spray assembly 53 through the water supply pipe 52, the spray assembly 53 sprays the cleaning medium to the spray area. Alternatively, the cleaning device 5 is started, and the upper and lower drive structure 55 drives the support assembly 51 to move along the guide structure 22 on the inner wall of the air collection box 2. At the same time, the rotation drive structure 54 starts to drive the water supply pipe 52 to rotate around the support assembly 51. The water supply pipe 52 drives the spray assembly 53 on it to rotate. When the cleaning medium is delivered to the spray assembly 53 through the water supply pipe 52, the spray assembly 53 sprays the cleaning medium to the spray area. The spraying area of ​​the spraying component 53 includes at least a first spraying area corresponding to the inner wall surface of the panel 1. After the spraying component 53 sprays the cleaning medium into the first spraying area, the cleaning medium cleans the inner wall surface of the panel 1 of the range hood, so that the mixture of oil and water adhering to the inner wall of the panel 1 of the range hood is cleaned. It can automatically clean the oil stains adhering to the wall surface of the air collection box 2 of the range hood and the inner wall surface of the panel 1, keep the air collection box 2 of the range hood clean, and make the range hood have a better purification effect. The user can clean the oil stains accumulated in the inner cavity of the air collection box 2 of the range hood without disassembling the range hood.

[0045] Please see Figure 4The bellows assembly of the present invention includes a back plate 25 for the air collection box 2, and a second spraying area corresponding to the inner wall surface of the back plate 25 for the spraying area of ​​the spraying assembly 53. When the bellows assembly of the present invention is applied to a range hood, when the range hood is working, external fumes enter the air collection box 2 through the air inlet 11 on the panel 1 of the range hood, and are then discharged from the air collection box 2. After the fumes enter the air collection box 2, they flow towards the air inlet of the exhaust fan 3 under the action of the exhaust fan 3. During the flow towards the exhaust fan 3, part of the airflow formed by the fumes will directly enter the housing of the exhaust fan 3 through the air inlet of the exhaust fan 3, 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 3, and then enter the housing of the exhaust fan 3, and finally be discharged from the air collection box 2 by the exhaust fan 3. 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 3. Since the exhaust fan 3 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 panel 25 above the suction inlet 11 and the inner wall surface of the panel 1 above the suction inlet 11. When the oil and water mixture accumulates to a certain amount on the inner wall surface of the back panel 25 above the suction inlet 11 and the inner wall surface of the panel 1 above the suction inlet 11, this... The mixture of oil and water flows along the inner wall of the back panel 25 above the air intake 11 to the inner wall of the back panel 25 below the air intake 11, and along the inner wall of the panel 1 above the air intake 11 to the inner wall of the panel 1 below the air intake 11. Therefore, the spraying area of ​​the spray assembly 53 includes a first spraying area corresponding to the inner wall of the panel 1 of the range hood and a second spraying area corresponding to the inner wall of the back panel 25. The spray assembly 53 cleans in the first and second spraying areas, which can clean the inner wall of the back panel 25 and the inner wall of the panel 1.

[0046] The air box assembly of the present invention, the cleaning device 5 further has a second cleaning position. In the first cleaning position, the air intake 11 is open and the exhaust fan 3 is turned on, and the spray assembly 53 cleans the shielding surface. In the second cleaning position, the spray assembly 53 is located above the air intake 11. At this time, the exhaust fan 3 is turned off, the spray assembly 53 rotates 360° and sprays the cleaning medium to clean the exhaust fan 3 and the inner wall of the air collection box 2. When the air box assembly of the present invention is applied to a range hood, during the operation of the range hood, the baffle surface on the damper plate 42 covers the air intake 11, the exhaust fan 3 is activated, and external fumes enter the air collection box 2 through the air intake 11 on the panel 1. Then, the fumes are discharged from the air collection box 2 by the exhaust fan 3 located inside the air collection box 2. The exhaust fan 3 is positioned above the air intake 11. After the fumes enter the air collection box 2, they flow towards the air inlet of the exhaust fan 3 under the action of the exhaust fan 3, enter the housing of the exhaust fan 3, and are then discharged from the air collection box 2 by the exhaust fan 3. During the process of the exhaust fan 3 sucking up fumes, the cleaning device 5 is in the first cleaning position, which the user can activate. The cleaning device 5 cleans the shielding surface on the damper plate 42. When the cleaning device 5 cleans the shielding surface of the damper plate 42, it does not affect the operation of the exhaust fan 3. After the range hood finishes running and the exhaust fan 3 is turned off, the drive device 43 can just transport the cleaned damper plate 42 to the first section 411 of the guide rail 41 and move the damper plate 42 to the first section 411 of the guide rail 41. The shielding surface closes the air intake 11, and the clean bulge 421 protrudes from the air intake 11. 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 air intake 11 and then flow towards the exhaust fan 3. Since the exhaust fan 3 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 plate 25 above the air intake 11, the inner wall surface of the panel 1 above the air intake 11, and the housing of the exhaust fan 3. When the oil and water mixture accumulates to a certain amount on the inner wall surface of the back plate 25 above the air intake 11, the inner wall surface of the panel 1 above the air intake 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 above the air intake 11 to the inner wall surface of the back plate 25 below the air intake 11. The portion of the inner wall surface of panel 1 above the air intake 11 flows towards the portion of the inner wall surface of panel 1 below the air intake 11. After the exhaust fan 3 is turned off, the spray assembly 53 moves to the second cleaning position. In the second cleaning position, the spray assembly 53 sprays cleaning medium and cleans the mixture of oil and water on the portion of the inner wall surface of back plate 25 above the air intake 11, the portion of the inner wall surface of panel 1 above the air intake 11, and the housing of exhaust fan 3. The cleaning medium mixed with the cleaned oil and water flows along the portion of the inner wall surface of back plate 25 above the air intake 11 towards the portion of the inner wall surface of back plate 25 below the air intake 11, and the portion of the inner wall surface of panel 1 above the air intake 11 towards the portion of the inner wall surface of panel 1 below the air intake 11, until the spray assembly 53 completes the cleaning operation in the first cleaning position.

[0047] The air box assembly of the present invention includes a third spraying area corresponding to the area where the exhaust fan 3 is located in the spraying area of ​​the spraying assembly 53. When the water supply pipe 52 rotates, the spraying assembly 53 can spray the inner wall surface of the panel 1, the inner wall surface of the back plate 25 and the exhaust fan 3. When the air box assembly of the present invention is applied to a range hood, when the range hood is working, the exhaust fan 3 is started. External fumes enter the air collection box 2 through the air inlet 11 on the panel 1 of the range hood, and are then discharged from the air collection box 2 by the exhaust fan 3 located inside the air collection box 2. The exhaust fan 3 is located above the air inlet 11. After the fumes enter the air collection box 2, they flow towards the air inlet of the exhaust fan 3 under the action of the exhaust fan 3. During the flow towards the exhaust fan 3, part of the airflow formed by the fumes will directly enter the housing of the exhaust fan 3 through the air inlet of the exhaust fan 3, 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 3, and then enter the housing of the exhaust fan 3, and finally be discharged from the air collection box 2 by the exhaust fan 3. 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 3. Since the exhaust fan 3 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 3. 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, this oil and water mixture will flow from the inner wall surface of the back plate 25 above the suction inlet 11 to the inner wall surface of the back plate 25 below the suction inlet 11, and from the inner wall surface of the panel 1 above the suction inlet 11... The spray flow is partially directed towards the inner wall of panel 1 below the air intake 11 and downwards towards the exhaust fan 3. Therefore, the spray area of ​​the spray assembly 53 includes a first spray area corresponding to the inner wall of panel 1 of the range hood, a second spray area corresponding to the inner wall of back panel 25, and a third spray area corresponding to the area where the exhaust fan 3 is located. In the second cleaning position, the spray assembly 53 is located above the air intake 11, and it cleans the portions of the first and second spray areas above the air intake 11 and the third spray area. In the second cleaning position, the spray assembly 53 is located below the air intake 11, and it cleans the portions of the first and second spray areas below the air intake 11. This can clean the entire inner wall of the back panel 25 of the air collection box 2, the inner wall of panel 1, and the exhaust fan 3.

[0048] Please see Figure 1The bellows assembly of the present invention includes a spray assembly 53 comprising a plurality of nozzles evenly distributed on a water supply pipe 52. The water supply pipe 52 is connected to a water pump and is equipped with a control valve. The water pump is connected to a water tank for storing cleaning media. A connection port is provided between the nozzles and the water supply pipe, and a switch valve is provided at each connection port. When the spray assembly 53 is in operation, the water pump starts, the control valve opens, and the cleaning media stored in the water tank is pumped into the water supply pipe 52. With the switch valve opening the connection port between the nozzle and the water supply pipe 52, the nozzles spray the cleaning media to clean the sprayed area.

[0049] Please see Figure 1 The bellows assembly of the present invention includes a rotation drive structure 54 comprising a rotation drive motor 541, an output shaft on which a first connecting rod 542 is connected, a second connecting rod 543 connected to a water supply pipe 52, and a third connecting rod 544 hinged between the first connecting rod 542 and the second connecting rod 543. When the rotation drive structure 54 is in operation, the rotation drive motor 541 starts, and its output end drives the first connecting rod 542 to rotate at one end, causing the end of the first connecting rod 542 connected to the third connecting rod 544 to swing. The first connecting rod 542 drives the third connecting rod 544 to swing, which in turn drives the end of the second connecting rod 543 connected to swing. The other end of the second connecting rod 543 is connected to the water supply pipe 52. The rotation of the other end of the second connecting rod 543 simultaneously drives the water supply pipe 52 to rotate, and the spray assembly 53 rotates with the water supply pipe 52.

[0050] Please see Figure 1 The bellows assembly of the present invention includes a support assembly 51 comprising a left support and a right support. A water supply pipe 52 is rotatably connected to the left and right supports and is made of a rigid material. A rotation drive structure 54 is fixed to either the left or right support. The support assembly 51 is positioned above the air intake 11. When the spray assembly 53 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 55 is activated, driving the support assembly 51 to slide along the guide structure 22. The water supply pipe 52 slides along the guide structure 22 with the support assembly 51, so that the spray assembly 53 moves between the first and second cleaning positions to clean the corresponding spray area. The bracket assembly 51 is positioned above the air intake 11. This means that after the bracket assembly 51 is slidably connected to the guide structure 22, the bracket assembly 51 does not contact the inner wall surface of the panel 1. There is a gap between the bracket assembly 51 and the air intake 11. This gap prevents the water supply pipe 52 from contacting the inner wall surface of the panel 1, thus avoiding clogging the liquid outlet of the spray assembly 53. When the spray assembly 53 sprays the cleaning medium onto the inner wall surface of the panel 1, the cleaning medium has room to flow.

[0051] Please see Figures 1 to 5 The present invention also discloses a range hood. The range hood disclosed in the present invention uses the above-mentioned air box assembly and further includes a brush assembly 6 disposed in the accommodating cavity. The brush assembly 6 includes a fixed bracket 61 and a brush 62 disposed on the fixed bracket 61 for cleaning the shielding surface. The fixed bracket 61 is provided with a brush rotation drive member 63 that can drive the brush 62 to rotate relative to the fixed bracket 61. After the damper plate 42 moves along the guide rail 41 to the second section 412 of the guide rail 41, the damper plate 42 is tilted. The shielding surface and the bulge 421 on the shielding surface of the damper plate 42 face the cleaning device 5 and the brush assembly 6. When the cleaning device 5 is started and the spray assembly 53 starts to spray the cleaning medium onto the shielding surface of the damper plate 42, the brush assembly 6 is started. The brush rotation drive 63 drives the brush 62 to rotate on the fixed bracket 61, so that the brush 62 acts on the shielding surface of the damper plate 42. The brush 62 brushes the shielding surface of the damper plate 42 when the spray assembly 53 starts to spray the cleaning medium onto the shielding surface of the damper plate 42, and cleans the shielding surface of the damper plate 42.

[0052] In some embodiments, the brush 62 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 brush assembly 6 is not activated, the left and right brush bristles are vertically distributed. When the brush assembly 6 is activated, the brush rotation drive 63 is activated and drives the brush 62 to rotate around the fixed bracket 61. The brush 62 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 42.

[0053] Please see Figure 6 In some embodiments, the brush assembly 6 further includes a brush up-and-down driving structure 64, the driving end of which is connected to a fixed bracket 61 to drive the fixed bracket 61 to move within the air collection box 2. Before the damper plate 42 moves onto the second section 412 of the guide rail 41, the brush up-and-down driving structure 64 moves the fixed bracket 61 below the air intake 11. After the damper plate 42 moves onto the second section 412 of the guide rail 41, the brush 62 is located within the accommodating cavity formed by the damper plate 42 and the panel 1. After the damper plate 42 moves onto the first section of the guide rail 41 and closes the air intake 11, the brush up-and-down driving structure 64 drives the fixed bracket 61 to move within the air collection box 2, and cooperates with the cleaning device 5 to clean the inner cavity of the air collection box 2.

[0054] Please see Figure 7In the illustrated embodiment, the brush 62 includes a rotating shaft and scrapers evenly distributed on the rotating shaft. When the brush assembly 6 is activated, the brush rotation drive 63 is activated and drives the brush 62 to rotate around the fixed bracket 61. The scrapers press against the wall of the receiving cavity, scraping the oil stains on at least the shielding surface of the damper plate 42 downwards, and working with the cleaning device 5 to clean the shielding surface of the damper plate 42. Figure 4 In the embodiment, the brush assembly 6 adopts Figure 7 The brush assembly shown.

[0055] In some embodiments, scrapers / brushes are directly installed on the water supply pipe 52. While the rotation drive structure 54 drives the water supply pipe 52 to rotate, the scrapers / brushes and the spray assembly 53 rotate with the water supply pipe 52. The water supply pipe 52 sprays cleaning medium, and the scrapers / brushes at least scrape the shielding surface of the damper plate 42.

[0056] Please see Figure 4 The range hood of the present invention has an oil drain hole 23 at the bottom of the air collection box 2 and an oil cup 24 for receiving the oil flowing out of the oil drain hole 23. The oil cup 24 is equipped with a liquid level sensor. The cleaning device 5 has a first cleaning position and a second cleaning position. In the second cleaning position, the cleaning device 5 is located above the air intake 11. At this time, the exhaust fan 3 is turned off. The cleaning device 5 cleans the exhaust fan 3 and the inner wall of the air collection box 2. The cleaning device 5 adjusts the spraying time according to the amount of oil collected in the oil cup 24. The cleaning device 5 stops operating after the spraying time is reached. In the first cleaning position, the spraying component 53 is located in the accommodating cavity. The cleaning device 5 stops operating after working for 1-5 minutes. When the cleaning device 5 is working, the cleaning medium sprayed by the spray assembly 53 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 42, and the housing of the exhaust fan 3, and drip down to the bottom of the air collection box 2. Then, the mixture drips down through the oil drain hole 23 at the bottom of the air collection box 2 and is collected by the oil cup 24 at the bottom of the air collection box 2. When the spray assembly 53 is in the second cleaning position, the cleaning area is relatively large. As long as the liquid level sensor in the oil cup 24 does not alarm the control system, the spray assembly 53 will continue to work and clean the oil stains in the spray area. When the oil stains collected in the oil cup 24 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 53 to prevent the oil stains in the oil cup 24 from overflowing. When the spray assembly 53 of the cleaning device 5 enters the first cleaning position, the spray assembly 53 cleans the shielding surface of the damper plate 42 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 53 stops operating after spraying for 1-5 minutes, which can clean the shielding surface of the damper plate 42 and the inner wall surface of the panel 1 located below the air intake 11.

[0057] Please see Figure 4The range hood disclosed in this invention also includes a PM2.5 detection module 7 capable of real-time detection of ambient air quality and a display control device 8 capable of displaying its detection data. The PM2.5 detection module 7, the exhaust fan 3, the switchable air intake assembly 4, the cleaning device 5, and the brush assembly 6 are all electrically connected to the display control device 8. When the detection value of the PM2.5 detection module 7 reaches the set range, the display control device 8 sends a start command to the exhaust fan 3 and the switchable air intake assembly 4. The exhaust fan 3 enters the running state, and the switchable air intake assembly 4 starts and opens the air intake 11. In this invention, when the range hood is off, the air intake assembly 4 covers the air intake 11. After the range hood is turned on, the PM2.5 detection module 7 starts first, detects the air quality of the working environment, and sends the detection data to the display control device 8. The display control device 8 displays the data detected by the PM2.5 detection module 7 and determines whether the detection value of the PM2.5 detection module 7 reaches the set range. When the detection value of the PM2.5 detection module 7 reaches the set range, the display control device 8 sends a start command to the exhaust fan 3 and the air intake assembly 4. The exhaust fan 3 enters the running state, and the drive device 43 of the air intake assembly 4 starts and drives the damper plate 42 to slide along the guide rail 41, from the first section 411 of the guide rail 41 to the second section 412. After the damper plate 42 slides to the second section 412, it is located below the air intake 11 and is tilted, thus opening the air intake 11. When the exhaust fan 3 is activated, external 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 3. While the exhaust fan 3 is operating, the PM2.5 detection module 7 monitors the surrounding air quality in real time and sends the data to the display and control device 8. Simultaneously, the display and control device 8 activates the cleaning device 5 and brush assembly 6, which clean the shielding surface of the damper plate 42. When the PM2.5 detection module 7 detects a value lower than the set value... After the minimum value of the range is reached, the display control device 8 sends a shutdown command to the exhaust fan 3 and the drive device 43. The exhaust fan 3 enters the shutdown state, and the drive device 43 drives the damper plate 42 to slide along the guide rail 41 from the second direction section 412 to the first direction section 411. When the damper plate 42 slides to the first direction section 411, the bulge part 421 extends out of the air intake 11 and covers the air intake 11. The display control device 8 starts the cleaning device 5 to clean the inner cavity of the air collection box 2.

[0058] 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 windbox assembly for a range hood, comprising: The utility model relates to a kind of exhaust hood, including: Panel (1), which is provided with suction port (11) on it; Air collecting box (2) is connected with the suction port (11), and the air collecting box (2) is provided with exhaust fan (3) inside; Switch suction port assembly (4) is provided in the air collecting box (2), for opening or closing the suction port (11), the switch suction port assembly (4) is provided with the blocking surface that can close the suction port (11) and form the appearance surface of the panel (1) when closing the suction port (11); Cleaning device (5) is provided on the inner wall of the air collecting box (2), the cleaning device (5) has a first cleaning position, in the first cleaning position, the blocking surface faces the cleaning device (5), and the cleaning device (5) cleans the blocking surface, the suction port (11) is opened and the exhaust fan (3) is started.

2. The bellow assembly of claim 1, wherein, When the switch suction port assembly (4) closes the suction port (11), the blocking surface is tightly pressed against the panel (1);When the switch suction port assembly (4) opens the suction port (11), the blocking surface and the panel (1) form a containing cavity capable of containing the cleaning device (5), in the first cleaning state, the cleaning device (5) cleans the blocking surface in the containing cavity, the exhaust fan (3) operates and forms a negative pressure airflow at the suction port (11) to prevent water splashes generated by the cleaning device (5) from spattering out of the suction port (11).

3. The bellow assembly of claim 1, wherein, The switch suction port assembly (4) includes a guide rail (41), a damper plate (42), and a drive device (43) provided in the air collecting box (2), the blocking surface is provided on the damper plate (42), the blocking surface is provided with a bulge portion (421) protruding towards the suction port (11), the bulge portion (421) is matched with the suction port (11), the guide rail (41) includes a first section (411) and a second section (412), when the damper plate (42) is in the first section (411), the bulge portion (421) protrudes from the suction port (11);When the damper plate (42) is in the second section (412), the damper plate (42) is inclined, the cleaning device (5) can clean the bulge portion (421), and the drive device (43) drives the damper plate (42) to move between the first section (411) and the second section (412).

4. The bellow assembly of claim 3, wherein, The air collecting box (2) is provided with a horizontal fixed shaft (21), the drive device (43) is provided on the fixed shaft (21), the driving end of the drive device (43) is fixedly connected to the lower end of the damper plate (42) and can drive the damper plate (42) to slide on the guide rail (41);Both sides of the damper plate (42) are provided with bearings (44) capable of sliding on the guide rail (41), and the bearings (44) are sleeved with shock absorbers (45).

5. The bellow assembly of claim 1, wherein, The cleaning device (5) comprises a support assembly (51) arranged on the inner wall of the air collecting box (2) and a water supply pipeline (52) arranged on the support assembly (51), wherein a spraying assembly (53) is arranged on the water supply pipeline (52) towards one side, and a rotating driving structure (54) capable of driving the water supply pipeline (52) to rotate is arranged on the support assembly (51); the inner wall of the air collecting box (2) is further provided with a guide structure (22) capable of sliding the support assembly (51), and the guide structure (22) is provided with an up-down driving structure (55) for driving the support assembly (51) to slide along the guide structure (22).

6. The bellow assembly of claim 5, wherein, The cleaning device (5) further has a second cleaning position, in which the air suction port (11) is opened and the exhaust fan (3) is started, and the spraying assembly (53) cleans the shielding surface; in the second cleaning position, the shielding surface closes the air suction port (11), and the spraying assembly (53) is located above the air suction port (11), at this time the exhaust fan (3) is closed, the spraying assembly (53) is rotated by 360° and sprays cleaning medium to clean the exhaust fan (3) and the inner wall of the air collecting box (2).

7. The bellow assembly of claim 5, wherein, The spraying assembly (53) comprises a plurality of spray heads uniformly distributed on the water supply pipeline (52), the water supply pipeline (52) is connected with a water pump, the water supply pipeline (52) is provided with a control valve, the water pump is connected with a water tank for storing cleaning medium, and a connecting port is arranged between the spray head and the water supply pipeline, and a switch valve is arranged at each connecting port.

8. The bellow assembly of claim 5, wherein, The rotating driving structure (54) comprises a rotating driving motor (541), the rotating driving motor (541) is provided with an output rotating shaft, the output rotating shaft is connected with a first connecting rod (542), the water supply pipeline (52) is connected with a second connecting rod (543), and the first connecting rod (542) and the second connecting rod (543) are hingedly connected with a third connecting rod (544).

9. A range hood employing the bellows assembly of any one of claims 2 to 8, characterized in that, Further comprising a brush assembly (6) arranged in the accommodating cavity, the brush assembly (6) comprises a fixed support (61) and a brush (62) arranged on the fixed support (61) and used for cleaning the shielding surface, and the fixed support (61) is provided with a brush rotating driving member (63) capable of driving the brush (62) to rotate relative to the fixed support (61).

10. The hood according to claim 9, characterized in that, The bottom of the air collecting box (2) is provided with an oil leakage hole (23) and an oil cup (24) for receiving the oil stains flowing out of the oil leakage hole (23), and the oil cup (24) is provided with a liquid level sensor; the cleaning device (5) is provided with a first cleaning position and a second cleaning position, at the second cleaning position, the cleaning device (5) is located above the air suction port (11), the exhaust fan (3) is closed, the shielding surface closes the air suction port (11), the cleaning device (5) cleans the inner wall of the exhaust fan (3) and the air collecting box (2), the cleaning device (5) adjusts the spraying time according to the amount of oil stains collected in the oil cup (24), and the cleaning device (5) stops running after the spraying time is reached.

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