CN111059598A

CN111059598A - Fume exhaust fan

Info

Publication number: CN111059598A
Application number: CN202010013993.1A
Authority: CN
Inventors: 唐兴旺; 袁柯铭
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2020-04-24
Anticipated expiration: 2040-01-07
Also published as: CN111059598B

Abstract

The invention discloses a range hood, which comprises a fan system and a self-cleaning device, wherein the fan system comprises a primary fan and a secondary fan which are connected in series, a wind guide pipe is connected between the primary fan and the secondary fan, the self-cleaning device comprises a shell arranged on the side surface of the wind guide pipe, a first channel and a second channel are formed in the shell, the first channel is provided with a first channel inlet and a first channel outlet which are selectively communicated with the wind guide pipe, the second channel has a second channel inlet and a second channel outlet which are selectively communicated with the wind guide pipe, the self-cleaning device also comprises a movable clapboard arranged in the shell, the movable clapboard comprises a first clapboard which selectively opens or closes the first channel inlet and a second clapboard which selectively isolates the second channel outlet from a circulating air outlet, when the first channel inlet is closed, the second channel outlet is communicated with the circulating air outlet, when the outlet of the second channel is isolated from the circulating air outlet, the first channel is communicated with the second channel; a nozzle is arranged in the second channel.

Description

Fume exhaust fan

Technical Field

The invention relates to an oil fume purification device, in particular to a range hood.

Background

The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.

A series double-fan type range hood appears in the current market, has the characteristics of high static pressure, high grease separation and low pollutant discharge, and is popular in the market. Such a series double-fan range hood is generally provided with a primary fan and a secondary fan located above the primary fan. The range hood disclosed in the chinese patent with the application number of 201710009435.6 comprises an oil smoke inlet, an oil smoke outlet, a first fan and a second fan, wherein an air inlet of the first fan is communicated with the oil smoke inlet, and an air outlet of the second fan is communicated with the oil smoke outlet.

When cooking produces oil smoke, oil smoke pollutants are firstly thrown away and filtered by the centrifugal force of the first-stage fan impeller (namely, primary centrifugal filtration), and then are thrown away and filtered by the centrifugal force of the second-stage fan impeller (namely, secondary centrifugal filtration), so the range hood has good oil smoke filtering capability. But simultaneously, because of its good oil smoke filter capacity, a large amount of greasy dirt is attached to primary fan and secondary fan, especially has attached a large amount of large granule pollutants at primary fan, and its contaminated degree is greater than secondary fan far away, and these pollutions can produce the influence to range hood's performance life-span. Therefore, the technology capable of simultaneously cleaning the primary fan and the secondary fan is developed, and particularly the technology capable of cleaning the heavily polluted primary fan has important significance for normal use of the series double-fan type range hood.

With the continuous progress of the self-cleaning technology of the range hood, the steam cleaning has been widely applied in the self-cleaning field of the range hood due to the good cleaning effect of the steam cleaning. The steam washing is based on the principle that a steam generator generates high-temperature steam, and then the steam is conveyed to parts to be washed, so that the self-cleaning of the range hood is realized. However, the nozzle of such a cleaning device is usually disposed in the air duct of the range hood, and during a long-term cooking process, the nozzle may be blocked, and finally the cleaning device may be disabled and damaged.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a range hood aiming at the defects of the prior art, wherein the range hood can simultaneously clean a primary fan and a secondary fan of a series range hood, and can realize circulation enhanced cleaning aiming at the primary fan with serious pollution, thereby prolonging the service life.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a range hood, includes the fan frame, sets up fan system and the automatically cleaning device in the fan frame, the fan system is including the one-level fan and the second grade fan of establishing ties, on oil smoke flow path, the second grade fan is located the low reaches of one-level fan, be connected with guide duct, its characterized in that between one-level fan and the second grade fan: the self-cleaning device comprises a shell arranged on the side surface of the air guide pipe, a first channel and a second channel are formed in the shell, the first channel has a first channel inlet and a first channel outlet selectively communicating with the air duct, the second channel is provided with a second channel inlet and a second channel outlet which are selectively communicated with the air guide pipe, the shell is also provided with a circulating air outlet which communicates the shell and the air frame, the self-cleaning device also comprises a movable clapboard arranged in the shell, the movable partition comprises a first partition for selectively opening or closing the inlet of the first channel, a second partition for selectively isolating the outlet of the second channel from the circulating air outlet, when the inlet of the first channel is closed, the outlet of the second channel is communicated with the circulating air outlet, and when the outlet of the second channel is isolated from the circulating air outlet, the first channel is communicated with the second channel; and a nozzle capable of spraying cleaning liquid is arranged in the second channel.

Preferably, an opening is formed in the side wall of the air guide pipe corresponding to the shell, the opening is provided with a first end and a second end which are opposite, and the first end is located at the downstream of the second end on the oil smoke flowing path; the shell comprises a top plate extending from the first end of the opening to the direction far away from the air guide pipe, the self-cleaning device also comprises a supporting plate, the supporting plate is arranged at the opening, a first baffle plate extending towards the direction far away from the air guide pipe is further arranged on one side of the supporting plate facing the inside of the shell, the side of the first baffle plate far away from the top plate is provided with second baffle plates at intervals, the first baffle plate and the second baffle plates extend in the same direction, the space between the first baffle plate and the top plate forms a first channel, a first channel inlet is formed between the ends of the first baffle plate and the top plate which are respectively far away from the air guide pipe, a first channel outlet is formed between the supporting plate and the first end of the opening, a second channel is formed by the space between the first baffle plate and the second baffle plate, a second channel inlet is formed between the supporting plate and the second baffle, and a second channel outlet is formed between the ends, far away from the air guide pipe, of the first baffle and the second baffle.

Preferably, the length of the first baffle is smaller than that of the second baffle, the movable partition is in an L shape, the length of the first partition is smaller than that of the second partition, the joint of the first partition and the second partition is rotatably connected with the top plate through the arrangement of a rotating shaft, the rotating shaft is always kept tightly attached to the top plate for sealing, the first partition can rotate to enable one end, away from the rotating shaft, to be abutted to the surface, facing the top plate, of the first baffle, so that the inlet of the first channel is sealed, and at the moment, the second partition is away from the second baffle; the second baffle can rotate to one side butt that makes the one end of keeping away from the axis of rotation and second baffle towards first baffle, keeps apart second passageway export and circulation air outlet, simultaneously and first baffle between have the clearance, make first passageway and second passageway intercommunication.

Preferably, in order to facilitate the opening and closing of the first and second passage outlets and inlets, the self-cleaning device further comprises a first sealing plate and a second sealing plate disposed at the opening, the first and second sealing plates being slidably connected to the housing, respectively, the first sealing plate being slidable between the first and second ends of the opening to open or close the first passage outlet, and the second sealing plate being slidable between the first and second ends of the opening to open or close the second passage inlet.

In order to facilitate the driving of the two sealing plates to move, the self-cleaning device further comprises a limiting shifting sheet arranged on the supporting plate, the limiting shifting sheet is respectively connected with the first sealing plate and the second sealing plate, and the limiting shifting sheet keeps moving towards the first end of the opening, so that the first sealing plate tends to seal the first channel outlet and the second sealing plate tends to seal the second channel inlet.

For making first passageway export and second passageway entry keep confined trend, avoid in the oil smoke gets into the casing when culinary art, spacing plectrum sets up in the backup pad towards one side in the air duct, the backup pad is close to the open-ended first end and is connected with the connecting rod between the both ends that are close to the second baffle, the extension spring cover is established in the connecting rod periphery, the one end joint support board of extension spring is close to the one end of open-ended first end, the other end and the spacing plectrum of extension spring are connected to make spacing plectrum keep the trend to the removal of open-ended first end.

In order to facilitate the limit shifting piece to drive the two sealing plates to act synchronously, the first sealing plate and the second sealing plate are connected with each other through a connecting rod, and the connecting rod penetrates through the limit shifting piece to be connected with the limit shifting piece.

In order to facilitate driving the limiting shifting piece to move and limit the resetting of the limiting shifting piece, the self-cleaning device further comprises an air duct partition plate arranged in the air guide pipe and on one side opposite to the opening, the air duct partition plate is rotatably connected with the air guide pipe, and the end, far away from the connection part with the air guide pipe, of the air duct partition plate can be abutted against the limiting shifting piece so as to push the limiting shifting piece to move towards the second end of the opening and limit the movement towards the first end of the opening.

Preferably, the casing further comprises a bottom plate extending from the first end of the opening to the direction far away from the air guide pipe, a first side plate located in the opening and extending between the first end and the second end, and a second side plate arranged at the top plate and far away from one end of the air guide pipe and extending in the same direction as the first side plate, wherein a circulating air outlet is formed between the end part of the second side plate far away from the top plate and the bottom plate, and the second baffle extends from the end of the first side plate close to the support plate to the direction far away from the air guide pipe.

Preferably, the self-cleaning device further comprises a water tank arranged outside the fan frame, the nozzle is connected with the water tank through a water pipe, and a water pump is arranged on the water pipe.

Compared with the prior art, the invention has the advantages that: through setting up the casing outside the wind-guiding pipe alone, form in the casing and can open or two confined passageways and with the circulation air outlet of fan frame intercommunication, through to the entry of first passageway, export and to the entry of second passageway, export selectively open or seal, can switch gas flow path to realize to polluting serious one-level fan circulation intensive cleaning, and the part is independently kept apart for the cleanness separately in the casing, prevent that the pollutant from blockking up and leading to self-cleaning device to damage.

Drawings

FIG. 1 is a schematic view of a range hood according to an embodiment of the present invention;

FIG. 2 is a schematic view of the front side of the hidden fan frame of the range hood according to the embodiment of the present invention;

FIG. 3 is a cross-sectional view of a range hood in accordance with an embodiment of the present invention;

FIG. 4 is a schematic view of the self-cleaning device and a portion of the air guiding pipe of the range hood according to the embodiment of the present invention;

fig. 5 is a partial sectional view of the self-cleaning device and the air guiding pipe of the range hood according to the embodiment of the invention.

FIG. 6 is a sectional view of a cooking state of the range hood according to the embodiment of the present invention;

FIG. 7 is a cross-sectional view of a first-stage fan of a range hood according to an embodiment of the present invention in a circulating self-cleaning state;

fig. 8 is a cross-sectional view of a secondary fan of a range hood according to an embodiment of the present invention in a circulating self-cleaning state.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 to 5, a range hood includes a fume collecting hood 1, a fan frame 2 located above the fume collecting hood 1, and a fan system 3 disposed in the fan frame 2. The fume collecting hood 1 is provided with an air inlet 11, a fume guide plate 12 capable of lifting is arranged below the air inlet 11, the fume guide plate 12 can lift to close the air inlet 11, and when the range hood works, the fume guide plate 12 descends to open the air inlet 11.

The fan system 3 comprises a primary fan 31 and a secondary fan 32, both fans being connected in series. In this embodiment, the primary fan 31 is located below the secondary fan 32, the primary fan 31 is vertically disposed, and includes a first volute 311 and a first impeller 312 disposed in the first volute 311, an axis of the first impeller 312 extends left and right, and an air outlet formed on the first volute 311 faces upward. The secondary fan 32 is horizontally arranged and comprises a second volute 321 and a second impeller 322 arranged in the second volute 321, an air inlet formed on the second volute 321 and extending from the axis of the second impeller 322 up and down faces downwards, and an air outlet of the primary fan 31 is connected with an air inlet of the secondary fan 32 through an air guide pipe 33. Alternatively, the primary fan 31 and the secondary fan 32 may be arranged in any other arrangement, as long as the secondary fan 32 is located downstream of the primary fan 31 in the lampblack flow path.

The range hood further comprises a self-cleaning device, which comprises a shell 41, a supporting plate 42, an air duct partition plate 43, a first sealing plate 44, a second sealing plate 45, a limiting shifting piece 46 and a nozzle 47. The casing 41 is connected to the air guide duct 33, and an opening 331 is formed in a side wall of the air guide duct 33 at a position corresponding to the casing 41. The opening 331 has a first end 3311 and a second end 3312 opposite to each other, and the first end 3311 is located downstream of the second end 3312 in the soot flow path. In the embodiment, the air guiding duct 33 extends in the longitudinal direction, so the first end 3311 is an upper end, and the second end 3312 is a lower end. The housing 41 includes a top plate 411 and a bottom plate 412 extending from the first end 3311 and the second end 3312 of the opening 331 toward a direction away from the air guiding duct 33, a first side plate 413 located in the opening 331 and extending between the first end 3311 and the second end 3312, and a second side plate 414 disposed at an end of the top plate 411 away from the air guiding duct 33 and extending in the same direction as the first side plate 413. The first side plate 413 extends from the second end 3312 of the opening 331 to the first end 3311, and has a certain gap with the first end 3311 of the opening 331, so that the casing 41 and the air guiding pipe 33 are communicated with each other. The length of the top plate 411 is greater than that of the bottom plate 412, so that a circulating air outlet 415 is formed between the end of the second side plate 414 far away from the top plate 411 and the bottom plate 412.

The support plate 42 is disposed at the opening 331 between the first side plate 413 and the first end 3311 (the top plate 411) of the opening 331, and the support plate 42 and the first side plate 413 and the first end 3311 of the opening 331 are not in contact with each other with a gap therebetween. The support plate 42 is fixedly connected to the housing 41, and the support plate 42 extends in the same direction as the flow direction of the soot, and extends between the first end 3311 and the second end 3312 of the opening 331. In the present embodiment, the front and rear sides are fixed in the housing 41 so as to extend in the longitudinal direction.

The supporting plate 42 is further provided with a first baffle 416 extending towards the direction away from the air guiding pipe 33 on the side facing the inside of the casing 41, one end of the first side plate 413 close to the supporting plate 42 is provided with a second baffle 417 extending towards the direction away from the air guiding pipe 33, and the extending directions of the top plate 411, the first baffle 416, the second baffle 417 and the bottom plate 412 are substantially the same. The second baffle 417 has a length substantially equal to that of the bottom plate 412, and a third baffle 418 is connected between the second baffle 417 and one end of the bottom plate 412 away from the air duct 33. The length of the first baffle 416 is smaller than that of the second baffle 417, that is, the end of the first baffle 416 away from the air duct 33 is further away from the second side plate 414 of the housing 41.

Thus, the space between the first baffle 416 and the top plate 411 constitutes a first channel 491, a first channel inlet 4911 between the ends of the first baffle 416 and the top plate 411, respectively, remote from the air-guiding duct 33, and a first channel outlet 4912 between the support plate 42 and the first end 3311 of the opening 331. The space between the first baffle 416 and the second baffle 417 forms a second channel 492, the space between the support plate 42 and the second baffle 417 forms a second channel inlet 4921, and the space between the first baffle 416 and the second baffle 417 forms a second channel outlet 4922 between the ends of the air ducts 33 of the first baffle 416 and the second baffle 417, respectively. The first channel 491 is communicated with the inside of the air guide pipe 33 through a first channel outlet 4912, and communicated with the second channel 492 through a first channel inlet 4911, and the second channel 492 is communicated with the inside of the air guide pipe 33 through a second channel inlet 4921, and communicated with the first channel 491 or the circulating air outlet 415 through a second channel outlet 4922.

The position restricting paddle 46 is disposed on a side of the support plate 42 facing the inside of the air guiding duct 33 and is movable along an extending direction of the support plate 42, such as a longitudinal direction. A connecting rod 461 is connected between the first end 3311 of the supporting plate 42 close to the opening 331 and the two ends close to the second baffle 417, the tension spring 462 is sleeved on the periphery of the connecting rod 461, one end of the tension spring 462 is connected with one end of the supporting plate 42 close to the first end 3311 of the opening 331, and the other end of the tension spring 462 is connected with the limit shifting piece 46, so that the limit shifting piece 46 keeps the trend of moving towards the first end 3311 of the opening 331. In this embodiment, the spacing paddles 46 maintain a tendency to move upward.

The duct partition 43 is disposed in the air duct 33 at a side opposite to the opening 331, and the duct partition 43 is rotatably connected to the air duct 33 and can be driven by a first driving mechanism 431, such as a motor, to rotate relative to the air duct 33. The free end of the duct partition 43 may abut against the limit paddle 46, thereby pressing the limit paddle 46 downward (moving toward the second baffle 417) and limiting its upward movement.

The first sealing plate 44 and the second sealing plate 45 are slidably disposed relative to the housing 41, the first sealing plate 44 is located above the second sealing plate 45, and the first sealing plate 44 and the second sealing plate 45 both extend in the same direction as the supporting plate 42. The first sealing plate 44 is disposed at a height capable of closing the first passage outlet 4912, and the second sealing plate 45 is disposed at a height capable of closing the second passage inlet 4921. First seal plate 44 is movable upwardly from below first channel exit 4912 to at first channel exit 4912 or downwardly from at first channel exit 4912 to below first channel exit 4912. Second seal plate 45 is movable from below second channel inlet 4921 up to second channel inlet 4921 or from below second channel inlet 4921 down to below second channel inlet 4921. The first sealing plate 44 and the second sealing plate 45 are connected with each other through a connecting rod 441, and the connecting rod 441 further penetrates through the limiting shifting piece 46 and is connected with the limiting shifting piece 46, so that the movement of the limiting shifting piece 46 can drive the two sealing plates to move, namely the limiting shifting piece 46, the first sealing plate 44 and the second sealing plate 45 synchronously move downwards or synchronously move upwards. The housing 41 is provided with guide rails 419 at two opposite sides of the opening 331, and two corresponding sides of the first sealing plate 44 and two corresponding sides of the second sealing plate 45 are respectively slidable along the guide rails 419.

A side of the support plate 42 facing inside the housing 41 is provided with a nozzle 47, the nozzle 47 facing the second passage outlet 4922. The nozzle 47 is used for being connected with a water source arranged outside the fan frame 2, such as a water tank 471 arranged on the outside of the fan frame 2 through a water pipe 472 in the embodiment, and a water pump 473 is arranged on the water pipe 472, so that water or cleaning agent in the water tank 471 can be sprayed into the housing 41. The nozzle 47 is located within the second channel 492. An atomizing device 474 is also provided between the water pipe 472 and the nozzle 47.

The housing 41 is further provided with a movable partition 48, the movable partition 48 is L-shaped and includes a first partition 481 and a second partition 482, the first partition 481 and the second partition 482 can be integrally formed, and the length of the second partition 482 is greater than that of the first partition 481. The joint of the first and

second partitions

481 and 482 is rotatably coupled to the top plate 411 by providing a rotation shaft 484, and the rotation shaft 484 of the movable partition 48 and the rotation shaft of the duct partition 43 extend in the same direction as the front-rear direction. The pivot shaft 484 is always kept in close contact with and sealed with the top plate 411. The first diaphragm 481 is closer to the air guide duct 33 than the second diaphragm 482, that is, the end of the first diaphragm 481 remote from the rotation axis 484 is closer to the air guide duct 33 than the end of the second diaphragm 482 remote from the rotation axis 484, and as shown in fig. 5, the first diaphragm 481 is located on the right side of the second diaphragm 482 and the air guide duct 33 is located on the right side of the case 41.

The movable partition 48 may be driven for rotation by a second drive mechanism 483, such as a motor. The first partition 481 may be rotated such that an end thereof remote from the rotation axis 484 abuts a surface of the first shutter 416 facing the top plate 411, thereby closing the first passage inlet 4911, and at this time, the second partition 482 may be remote from the second shutter 417 and an end thereof remote from the rotation axis 484 may be close to the second side plate 414; the second partition 482 may be rotated such that an end thereof remote from the rotation shaft 484 abuts a face of the second baffle 417 facing the first baffle 416, isolating the second passage outlet 4922 from the circulation outlet 415 while having a gap from the first baffle 416 so that the first passage 491 and the second passage 492 can communicate. At the same time, first spacer 481 and first baffle 416 do not abut against each other, and second spacer 482 and second baffle 417 do not abut against each other.

Referring to fig. 5, let the radius of the rotation axis 484 of the movable partition 48 be r, the length of the second partition 482 be a, the length of the first partition 481 be B, the rotation center of the rotation axis 484 be O, the height of the first passage 491 be H, and the total height of the first passage 491 and the second passage 492 be H. At least one sealing position M is arranged on the first baffle 416, so that the distance OM is less than or equal to B, and B + r is more than or equal to h, and the position M is positioned on the vertical central line of the rotating shaft 484 or positioned on the right side of the central line; at least one sealing position N is arranged ON the second baffle 417, so that the distance ON is less than or equal to A, and A + r is more than or equal to H, and the position N is positioned ON the vertical center line of the rotating shaft 484 or ON the left side of the center line.

The position of the rotation center of the movable partition 48 is not exclusive, and it is only necessary that the rotation shaft 484 is rotatably sealed with the inner surface of the top plate 411, the second partition 482 is sealed with the second shutter 417 during the rotation, and the first partition 481 is sealed with the first shutter 416. The horizontal position of the rotation center depends on the lengths of the first and

second spacers

481 and 482.

Referring to fig. 6, the range hood is in a cooking state, at this time, the air inlet 11 of the smoke collecting hood 1 is opened, the air duct partition 43 is in a vertical state, and the limiting shifting piece 46 does not receive the force of the air duct partition 43, and therefore moves upwards to the upper limiting position, and drives the two sealing plates to move upwards to the limiting position, so that the first sealing plate 44 seals the first channel outlet 4912, and the second sealing plate 45 seals the second channel inlet 4921. At this time, one end of the second partition 482 of the movable partition 48, which is away from the rotating shaft 484, abuts against the second shutter 417, thereby isolating the second passage 492 from the circulation outlet 415. Therefore, the first passage 491 and the second passage 492 are independent sealed cavities, and can be completely isolated from the oil smoke during cooking, thereby preventing the nozzle 47 from being polluted by the oil smoke. The arrow indicates the flow direction of the oil smoke, and after entering the fan frame 2 from the smoke collecting hood 1, the oil smoke is discharged upwards by the primary fan 31, then guided into the secondary fan 32 by the air guiding pipe 33, and then discharged into a common flue or a room by the secondary fan 32.

Referring to fig. 7, the range hood is in a circulating self-cleaning state of the primary fan 31, at this time, the air duct partition 43 rotates counterclockwise to push the limiting shifting piece 46 downward to the lower limiting position, and drive the two sealing plates to move downward to the limiting position, so that the first channel outlet 4912 and the second channel inlet 4921 are opened. Meanwhile, an end of the first partition 481 of the movable partition 48 remote from the rotation shaft 484 abuts against the first shutter 416, thereby closing the first passage inlet 4911. The arrow indicates the flow direction of the high-temperature steam, water in the water tank 471 is heated and atomized and then sprayed out through the nozzle 47, the high-temperature steam is discharged into the fan frame 2 through the circulation air outlet 415 from the second channel 492, then is sucked by the primary fan 31 to clean the primary fan 31, and then is discharged upwards to the air guide pipe 33, and then enters the second channel 492 through the second channel inlet 4921, and is discharged into the fan frame 2 through the circulation air outlet 415, and is sucked by the primary fan 31 again to realize the circulation of the high-temperature steam, so that the primary fan 31 is cleaned. In the above process, there is also a case where air is sucked to participate in the circulation. In addition, in the above process, the air inlet 11 may be in an open or closed state, and preferably, the smoke guide plate 12 closes the air inlet 11.

Referring to fig. 8, the range hood is in a self-cleaning state of the secondary fan 32, at this time, the air inlet 11 of the smoke collecting hood 1 is opened, the air duct partition 43 rotates counterclockwise, the limiting poking piece 46 is pushed downward to the lower limiting position, and the two sealing plates are driven to move downward to the limiting position, so that the first channel outlet 4912 and the second channel inlet 4921 are opened. Meanwhile, an end of the second partition 482 of the movable partition 48, which is away from the rotating shaft 484, abuts against the second shutter 417, thereby isolating the second passage 492 from the circulation outtake 415 while the second passage 492 and the first passage 491 are kept in communication. Arrows show the flowing directions of the air and the high-temperature steam, after the air enters the fan frame 2 from the smoke collecting hood 1, the air is discharged upwards through the primary fan 31, then enters the second channel 492 through the second channel inlet 4921, at this time, the nozzle 47 starts to spray the high-temperature steam into the second channel 492, the high-temperature steam and the air enter the air guide pipe 33 again after passing through the first channel 491, and are sucked by the secondary fan 32, so that the secondary fan 32 is cleaned by the high-temperature steam.

① only starts the first fan 31, the second fan 32 is not moving, the steam is sent into the second fan 32 by the first fan 31, the second impeller 322 of the second fan 32 is fully contacted with the high temperature steam, ② only starts the second fan 32, the first fan 31 is not moving, the steam is sucked into the second fan 32 by the second fan 32, the oil stain cleaning separation is realized under the high speed rotation of the second impeller 322 of the second fan 32, ③ starts the second fan 32 and the first fan 31 at the same time, the high temperature gas pressurization (the serial fan has the pressurization effect) can be realized, the cleaning effect is improved, ④ controls the front and back sequence and time of ①②③ mode according to the cleaning requirement by program control.

In the above cleaning process, the inner side wall surface of the fan frame 2 where the primary fan 31 is located and the inner side wall surface of the air guide pipe 33 are also cleaned.

In the present embodiment, the nozzle 47 sprays high-temperature steam, and alternatively, other cleaning agents may be used, and the cleaning agent is in a liquid state and can be carried by air.

Claims

1. The utility model provides a range hood, includes fan frame (2), sets up fan system (3) and the self-cleaning device in fan frame (2), fan system (3) are including the one-level fan (31) and the second grade fan (32) of establishing ties, on the oil smoke flow path, second grade fan (32) are located the low reaches of one-level fan (31), be connected with between one-level fan (31) and second grade fan (32) guide duct (33), its characterized in that: the self-cleaning device comprises a shell (41) arranged at the side of the air guide pipe (33), a first channel (491) and a second channel (492) are formed in the shell (41), the first channel (491) is provided with a first channel inlet (4911) and a first channel outlet (4912) selectively communicated with the inside of the air guide pipe (33), the second channel (492) is provided with a second channel inlet (4921) and a second channel outlet (4922) selectively communicated with the inside of the air guide pipe (33), the shell (41) is further provided with a circulating air outlet (415) communicated with the inside of the shell (41) and the inside of the air frame (2), the self-cleaning device further comprises a movable clapboard (48) arranged in the shell (41), the movable clapboard (48) comprises a first clapboard (481) selectively opening or closing the first channel inlet (4911), and a second clapboard (482) selectively isolating the second channel outlet (4922) and the circulating air outlet (415), when the first channel inlet (4911) is closed, the second channel outlet (4922) is communicated with the circulating air outlet (415), and when the second channel outlet (4922) is isolated from the circulating air outlet (415), the first channel (491) is communicated with the second channel (492); a nozzle (47) capable of ejecting a cleaning liquid is provided in the second passage (492).

2. The range hood of claim 1, wherein: an opening (331) is formed in the position, corresponding to the shell (41), on the side wall of the air guide pipe (33), the opening (331) is provided with a first end (3311) and a second end (3312) which are opposite, and the first end (3311) is located at the downstream of the second end (3312) on the oil smoke flow path; the shell (41) comprises a top plate (411) extending from a first end (3311) of the opening (331) to a direction away from the air guide pipe (33), the self-cleaning device further comprises a support plate (42), the support plate (42) is arranged at the opening (331), a first baffle plate (416) extending from the air guide pipe (33) is further arranged on one side of the support plate (42) facing the inside of the shell (41), a second baffle plate (417) is arranged on one side of the first baffle plate (416) away from the top plate (411) at intervals, the first baffle plate (416) and the second baffle plate (417) extend in the same direction, a first channel (491) is formed in a space between the first baffle plate (416) and the top plate (411), a first channel inlet (4911) is formed between one ends of the first baffle plate (416) and the top plate (411) away from the air guide pipe (33), and a first channel outlet (4912) is formed between the support plate (42) and the first end (3311) of the opening (331), the space between the first baffle plate (416) and the second baffle plate (417) forms a second channel (492), the support plate (42) and the second baffle plate (417) form a second channel inlet (4921), and the first baffle plate (416) and the second baffle plate (417) form a second channel outlet (4922) between the ends far away from the air guide pipe (33).

3. The range hood of claim 2, wherein: the length of the first baffle plate (416) is smaller than that of the second baffle plate (417), the movable partition plate (48) is L-shaped, the length of the first partition plate (481) is smaller than that of the second partition plate (482), the joint of the first partition plate (481) and the second partition plate (482) is rotatably connected with the top plate (411) through the arrangement of a rotating shaft (484), the rotating shaft (484) is always kept tightly attached to the top plate (411) for sealing, and the first partition plate (481) can rotate to enable one end, away from the rotating shaft (484), to be abutted to the surface, facing the top plate (411), of the first baffle plate (416), so that the first channel inlet (4911) is closed, and the second partition plate (482) is away from the second baffle plate (417); the second partition (482) is rotatable so that an end thereof remote from the rotation shaft (484) abuts a surface of the second baffle (417) facing the first baffle (416) to isolate the second passage outlet (4922) from the circulation outlet (415) while having a gap from the first baffle (416) to communicate the first passage (491) with the second passage (492).

4. The range hood of claim 2, wherein: the self-cleaning device further comprises a first sealing plate (44) and a second sealing plate (45) arranged at the opening (331), the first sealing plate (44) and the second sealing plate (45) being slidably connected with the housing (41), respectively, the first sealing plate (44) being slidable between the first end (3311) and the second end (3312) of the opening (331) to open or close the first passage outlet (4912), the second sealing plate (45) being slidable between the first end (3311) and the second end (3312) of the opening (331) to open or close the second passage inlet (4921).

5. The range hood of claim 4, wherein: the self-cleaning device further comprises a limiting shifting sheet (46) arranged on the supporting plate (42), the limiting shifting sheet (46) is respectively connected with the first sealing plate (44) and the second sealing plate (45), and the limiting shifting sheet (46) keeps moving towards the first end (3311) of the opening (331) so that the first sealing plate (44) tends to close the first channel outlet (4912) and the second sealing plate (45) tends to close the second channel inlet (4921).

6. The range hood of claim 5, wherein: the limiting shifting piece (46) is arranged on one side, facing the inside of the air guide pipe (33), of the supporting plate (42), a connecting rod (461) is connected between the first end (3311) close to the opening (331) and the two ends close to the second baffle plate (417) of the supporting plate (42), the periphery of the connecting rod (461) is sleeved with the tension spring (462), one end of the tension spring (462) is connected with one end, close to the first end (3311) of the opening (331), of the supporting plate (42), the other end of the tension spring (462) is connected with the limiting shifting piece (46), and therefore the limiting shifting piece (46) keeps the trend of moving towards the first end (3311) of the opening (331).

7. The range hood of claim 5, wherein: the first sealing plate (44) and the second sealing plate (45) are connected with each other through a connecting rod (441), and the connecting rod (441) also penetrates through the limiting shifting piece (46) to be connected with the limiting shifting piece (46).

8. The range hood of claim 5, wherein: the self-cleaning device further comprises an air duct partition plate (43) which is arranged in the air guide pipe (33) and is opposite to the opening (331), the air duct partition plate (43) is rotatably connected with the air guide pipe (33), and the end, far away from the connection part with the air guide pipe (33), of the air duct partition plate (43) can be abutted to the limiting shifting piece (46) so as to push the limiting shifting piece (46) to move towards the second end (3312) of the opening (331) and limit the movement towards the first end (3311) of the opening (331).

9. The range hood of claim 2, wherein: the shell (41) further comprises a bottom plate (412) extending from the first end (3311) of the opening (331) to the direction far away from the air guide pipe (33), a first side plate (413) located in the opening (331) and extending between the first end (3311) and the second end (3312), and a second side plate (414) arranged at one end, far away from the air guide pipe (33), of the top plate (411 and extending in the same direction as the first side plate (413), wherein a circulating air outlet (415) is formed between the end, far away from the top plate (411), of the second side plate (414) and the bottom plate (412), and the second baffle (417) extends from the end, close to the supporting plate (42), of the first side plate (413) to the direction far away from the air guide pipe (33).

10. The range hood according to any one of claims 1 to 9, wherein: the self-cleaning device further comprises a water tank (471) arranged outside the fan frame (2), the nozzle (47) is connected with the water tank (471) through a water pipe (472), and a water pump (473) is arranged on the water pipe (472).