CN115597098A - Range hood and control method thereof - Google Patents

Abstract

The invention relates to a range hood and a control method thereof, wherein the range hood comprises the following components: a housing having an air inlet; the rotary filter screen is driven by the driving motor to be rotationally arranged at the air inlet; a shield positioned within the housing along a flue gas flow path downstream of the rotary screen, the shield having an arcuate deflector surface arching toward one side of the rotary screen; the driving motor is arranged on one side, deviating from the arc-shaped flow guide surface, of the protective cover, and an output shaft of the driving motor penetrates through the protective cover and is connected with the rotary filter screen. The invasion and attack of the flue gas to the driving motor can be effectively avoided, and the service life of the driving motor is prolonged. On the other hand, one side of the protective cover facing the position of the rotary filter screen (namely facing the incoming flow direction of the airflow) is provided with an arched arc-shaped flow guide surface, so that the smoke can be guided well, the flow resistance of the smoke is reduced, and the smoke suction effect is ensured.

Description

Range hood and control method thereof

Technical Field

The invention relates to the technical field of kitchen appliances, in particular to a range hood and a control method thereof.

Background

The range hood is a kitchen appliance for purifying the kitchen environment. The oil smoke produced in the cooking process is easy to adhere to an oil guide plate, a filter screen, an inner cavity of the range hood and a fan of the range hood, and if the oil smoke is not cleaned in time, oil dirt can be formed after a long time, so that the oil smoke absorption effect of the fan of the range hood is reduced.

For the purification and filtration of oil fume, static filter screen and electrostatic adsorption are commonly adopted. The static filter screen is mainly installed in range hood air intake department, improves the physics collision probability of oil smoke and filter screen through the density that increases the filter screen hole, and then promotes the separating capacity of grease. After long-term use, the grease attached to the filter screen holes is easy to block the filter screen holes, and the air draft resistance is increased. The electrostatic adsorption type is to utilize high voltage electrostatic field to ionize the gas passing through between the electrodes, so as to adsorb on the electrodes to achieve the purpose of purifying the oil smoke. After long-term use, the accumulated oil stains on the polar plates are difficult to clean, but the oil stains are flammable and can be burned to cause fire danger when meeting open fire or being at a high temperature.

In order to improve the oil fume purification effect, the existing range hood is also provided with a rotary filter screen which is arranged at an air inlet and can be driven by negative pressure airflow or driven by an independent motor, oil drops are intercepted by physical collision of oil fume pollutants and the rotary filter screen and are thrown out under the action of centrifugal force, and therefore the oil fume separation effect of the range hood is improved. For example, the chinese utility model patent with the application number CN202020162275.6 discloses a rotary filter screen, a filter screen assembly and a range hood, wherein the rotary filter screen is used for the range hood and comprises a filter screen body and rotary fan blades; the rotating fan blade comprises a connecting sleeve and a plurality of blades which are arranged at intervals along the rotating circumference of the connecting sleeve, and the plurality of blades all incline towards the same side; the filter screen body is connected to the leeward side of the rotary fan blade. The rotary filter screen generates upward suction wind through the range hood to push the rotary filter screen to rotate, and when oil smoke passes through the rotary filter screen which rotates continuously, the rotary filter screen can continuously cut the oil smoke and intercept oil drops in the oil smoke; after the rotary filter screen intercepts oil smoke, oil drops on the rotary filter screen are thrown out to the periphery under the action of centrifugal force generated by rotation; the oil-fat separation degree in the oil smoke can be improved by the circulation. However, the rotary filter screen is driven to rotate by the upward suction wind generated by the range hood, so that the rotating speed cannot be accurately controlled, and the rotary filter screen cannot be well adapted to various different cooking working conditions to achieve targeted oil fume filtering effect.

The utility model discloses a chinese utility model patent that application number is CN201922435084.2 again discloses an oil smoke absorption device advances cigarette structure, including being used for the collection petticoat pipe of being connected with negative pressure device, negative pressure device can make collection smoke chamber in the collection petticoat pipe forms the negative pressure, set up on the collection petticoat pipe be used for to collection smoke chamber advances the mouth of cigarette, be equipped with tensile section of thick bamboo in advancing the mouth, tensile section of thick bamboo internal fixation has driving motor, driving motor is established in tensile section of thick bamboo and is located the shielding net dish on advancing the mouth with the lid and is connected, driving motor can drive shielding net dish rotates on advancing the mouth. This shielding net dish is controlled through the motor of independent setting, though can accurately with the rotational speed regulation of shielding net dish to with culinary art operating mode assorted state, nevertheless, because be arranged in driving shielding net dish pivoted motor exposes in the oil smoke, require very high to the leakproofness of motor, and motor surface fluid performance is not good, and it is put perpendicularly and is gone out at the air intake and inhale the influence of oil smoke effect.

Therefore, the existing range hood needs to be further improved.

Disclosure of Invention

The first technical problem to be solved by the invention is to provide a range hood which can reduce the invasion of oil smoke on a driving motor for driving a filter screen to rotate and can smoothly guide the flow of the smoke, aiming at the current situation of the prior art.

The second technical problem to be solved by the invention is to provide a control method of a range hood, which has a good oil smoke purifying effect and can realize self-cleaning, aiming at the current situation of the prior art.

The technical scheme adopted by the invention for solving the first technical problem is as follows: a range hood, comprising:

a housing having an air inlet;

the rotary filter screen is driven by the driving motor to be rotationally arranged at the air inlet;

a shield positioned within the housing along a flue gas flow path downstream of the rotary screen, the shield having an arcuate deflector surface arching toward one side of the rotary screen;

the driving motor is arranged on one side, deviating from the arc-shaped flow guide surface, of the protective cover, and an output shaft of the driving motor penetrates through the protective cover and is connected with the rotary filter screen.

In order to further reduce the oil smoke and drive motor contact to and avoid causing the influence because of the uncovered air current in protection casing top flows, the noise abatement problem is considered, the protection casing is kept away from one side of air intake has uncovered, and this uncovered department is equipped with the lid, the lid with the confined installation cavity is injectd jointly to the protection casing, drive motor locates in the installation cavity.

As an improvement, the method further comprises the following steps:

the cold air circulating device comprises a refrigerator for cooling air, wherein an air outlet of the refrigerator is communicated with the installation cavity through a first air pipe, so that air flow cooled by the refrigerator is conveyed into the installation cavity, an air inlet of the refrigerator is communicated with the installation cavity through a second air pipe, and the air in the installation cavity is conveyed into the refrigerator.

Let in cold air in to the installation cavity, both can cool down driving motor, also can cool down to the surface of protection casing, condensation oil that can be better after the surface cooling of protection casing drips, water droplet and other granule, also can cool down the oil smoke of process equally, reduces the influence of oil smoke to low reaches spare part.

As an improvement, a flow guide cover is further arranged in the casing, the flow guide cover is provided with a first port connected with the air inlet of the casing and a second port which is far away from the air inlet and connected with the inner wall of the casing, the aperture of the flow guide cover is gradually increased from the first port to the second port, a second overflowing air channel for smoke to pass through is formed between the arc-shaped flow guide surface of the protective cover and the inner wall of the flow guide cover, and the sectional area of the second overflowing air channel is firstly reduced and then increased along the flow direction of the smoke. The design of the air guide sleeve can smoothly guide the oil thrown off in the rotating process of the rotary filter screen and the oil dripping on the inner wall of the shell and the fan system downwards, so that the oil can be conveniently collected; on the other hand, the structural design that the sectional area of the second through-flow air channel is firstly reduced and then increased along the smoke flowing direction also correspondingly enables the speed of smoke flowing through the air inlet (namely the position of the rotary filter screen) to be reduced, and under the condition that the rotating speed of the rotary filter screen is constant, the rotary filter screen is in longer time contact with oil smoke particles in the smoke, so that the oil smoke purification effect is improved.

In order to reduce the escape of oil smoke, the air inlet is positioned at the bottom of the shell, a smoke baffle plate is further arranged at a position of the shell, which corresponds to the position below the air inlet, and a first overflowing air duct for external smoke to enter the air inlet is formed between the smoke baffle plate and the shell. The smoke baffle plate is arranged, so that the negative pressure drainage effect can be achieved, smoke can crawl along the bottom wall of the smoke baffle plate under the coanda effect, and the oil smoke escape is reduced.

In order to further reduce the flow speed of the smoke at the air inlet and effectively improve the oil smoke purification effect, the smoke baffle plate is protruded towards the direction far away from the air inlet in the area corresponding to the air inlet, so that the sectional area of the first overflowing air channel is gradually increased along the smoke flowing direction.

In order to collect oil stored on the smoke baffle conveniently, the rear side of the smoke baffle is also provided with an oil cup extending along the left-right direction.

In order to further improve the oil fume purification effect, the rotary filter screen and the protective cover at least have arc-shaped flow guide surfaces which are made of metal; further comprising:

the positive pole of the static electricity generating device is connected with the arc-shaped flow guide surface of the protective cover, and the negative pole of the static electricity generating device is connected with the rotary filter screen.

After the static generating device is started, a high-voltage electrostatic field is formed between the rotary filter screen and the arc-shaped flow guide surface of the protective cover, and oil smoke particles in the smoke are adsorbed to the surface of the arc-shaped flow guide surface under the action of the electric field force, so that the oil smoke purification effect is improved.

Because the electrostatic adsorption effect is better when the oil smoke granule in the flue gas is more (if stir-fry mode), and the electrostatic adsorption effect is less (if cook mode) in the flue gas, in order to make the electrostatic generator selectively open to the culinary art operating mode of reality, still include the humidity transducer who is arranged in detecting steam content in the flue gas, this humidity transducer is connected with range hood's control system electricity to make control system according to the flue gas humidity signal control that humidity transducer carried the opening and closing of electrostatic generator.

In order to realize self-cleaning of the arc-shaped flow guide surface of the protective cover, the driving motor is electrically connected with a control system of the range hood, so that the control system controls the rotating speed of the driving motor to be alternately increased and decreased when the humidity value of the smoke conveyed by the humidity sensor is larger than a set humidity value.

When the humidity value of the flue gas conveyed by the humidity sensor is greater than the set humidity value, the current cooking mode can be considered as a cooking mode, and the components of the flue gas mainly comprise water vapor, so that the surface (absorbing and gathering oil stains) of the arc-shaped flow guide surface can be cleaned by utilizing the water vapor in the flue gas, specifically, the rotating speed of the driving motor is alternately increased and reduced, so that the cleaning effect of the water vapor on the protective cover and the rotary filter screen is further improved, for example, when the rotating speed of the driving motor rotates to the minimum, the middle resistance of the air flow flowing through the rotary filter screen is small, the flow speed is large, the arc-shaped flow guide surface of the protective cover can be effectively washed, and the oil stains absorbed on the arc-shaped flow guide surface are stripped; when the rotating speed of the driving motor rotates to the maximum, the middle resistance and the flow speed of the airflow flowing through the rotary filter screen are large, most of steam can be intercepted in the high-speed rotation process of the rotary filter screen, and the intercepted steam can be cleaned along with the filter screen in the process of being thrown away from the periphery. On the other hand, in the process, oil stains and water drops stripped from the arc-shaped flow guide surface can also drop downwards, and after the oil stains and the water drops fall onto the rotary filter screen rotating at a high speed below, the oil stains and the water drops can also be thrown to the periphery under the centrifugal action of the rotary filter screen, and then the oil stains and the water drops can drop downwards under the flow guide action of the flow guide cover and are collected into an oil cup on the rear side of the smoke baffle below. The rotation speed of the driving motor is changed in such an alternative way, so that efficient self-cleaning of the rotary filter screen and the arc-shaped flow guide surface of the protective cover can be realized.

In order to further improve the self-cleaning effect of the arc-shaped flow guide surface of the rotary filter screen and the protective cover, the self-cleaning device further comprises a fan system arranged in the casing, and the fan system is electrically connected with a control system of the range hood, so that the control system controls the rotating speed of the fan system to be alternately reduced and increased when the humidity value of the flue gas conveyed by the humidity sensor is greater than a set humidity value, namely, when the rotating speed of the driving motor is at the maximum value, the rotating speed of the fan system is at the minimum value, and when the rotating speed of the driving motor is at the minimum value, the rotating speed of the fan system is at the maximum value.

When the rotational speed of fan system increases, the rotary filter screen rotational speed reduces, and in this process, because rotary filter screen's resistance reduces, fan suction increases, and the steam that inhales in the lampblack absorber cavity increases gradually, and kinetic energy increases, utilizes the air that has high temperature steam to carry out periodic pulse cleaning to the arc water conservancy diversion face of inhaling lampblack absorber inner chamber and protection casing.

When the speed of the fan system is reduced, the rotating speed of the rotary filter screen is increased, the suction force of the fan is reduced, the resistance of the rotary filter screen is increased, the steam sucked into the cavity of the range hood is reduced, and the kinetic energy is reduced. At the moment, smoke (mainly containing water vapor) is sucked to a smoke inlet of the range hood, most of steam can be intercepted in the process of throwing away the steam because the rotary filter screen is in high-speed rotation work, the intercepted steam is thrown away to a peripheral flow guide cover along with the filter screen, and the rotary filter screen can carry out self-cleaning in the process.

The technical scheme adopted by the invention for solving the second technical problem is as follows: a control method of a range hood comprises the following steps:

s1, starting a range hood;

s2, operating a fan system, and driving a motor to drive a rotary filter screen to rotate;

s3, detecting and acquiring a humidity value in the smoke by a humidity sensor, judging whether the humidity value in the current smoke is smaller than a set humidity value or not, if so, entering a step S4, and if not, entering a step S5;

s4, mainly treating oil smoke in the current smoke components, starting the static electricity generating device, controlling a driving motor by a control system to drive a rotary filter screen to rotate at a set rotating speed, and then returning to the step S3;

s5, mainly using water vapor in the current smoke components, closing the static electricity generating device, controlling the rotating speed of the driving motor to increase and decrease alternately by the control system, and simultaneously controlling the rotating speed of the driving fan system to decrease and increase alternately, namely when the rotating speed of the driving motor is at the maximum value, the rotating speed of the fan system is at the minimum value, when the rotating speed of the driving motor is at the minimum value, the rotating speed of the fan system is at the maximum value, and after the operation is carried out for a set time, then entering the step S6;

and S6, driving a motor to drive a rotary filter screen to rotate at a set rotating speed, and operating a fan system at the set rotating speed.

Compared with the prior art, the invention has the advantages that: a driving motor for driving rotary filter screen is located the protection casing and deviates from one side of air intake, therefore can effectively avoid the invasion and attack of flue gas to driving motor, has prolonged driving motor's life. On the other hand, one side of the protective cover facing the position of the rotary filter screen (namely facing the incoming flow direction of the airflow) is provided with an arched arc-shaped flow guide surface, so that the smoke can be guided well, the flow resistance of the smoke is reduced, and the oil smoke absorption effect is ensured. In the preferred scheme, through setting up static generating device for a high voltage electrostatic field has been formed between the arc water conservancy diversion face of rotary filter screen and protection casing, and the oil smoke granule in the flue gas adsorbs the surface of arc water conservancy diversion face under the effect of electric field force, has further improved oil smoke purifying effect.

Drawings

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

fig. 2 is a schematic perspective view of the range hood of the embodiment of the present invention without a smoke baffle;

FIG. 3 is a schematic perspective view of FIG. 2 without the rotary screen;

FIG. 4 is a vertical sectional view of the range hood of the embodiment of the present invention cut along the left-right direction;

FIG. 5 is a vertical sectional view of the range hood of the embodiment of the present invention cut along the front-rear direction;

fig. 6 is a flowchart of a control method of the range hood according to the embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

Directional terms such as "front," "rear," "upper," "lower," "left," "right," "side," "top," "bottom," and the like are used in the description and claims of the present invention to describe various example structural portions and elements of the invention, but are used herein for convenience of description only and are to be determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the present invention may be oriented in different directions, the directional terms are used for descriptive purposes and are not to be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity.

Referring to fig. 1-6, a range hood includes a housing 10, a fan system 13, a rotary filter 20, and a smoke barrier 70. The casing 10 includes a fan frame 11 and a smoke collecting hood 12 disposed at the bottom of the fan frame 11, the bottom of the smoke collecting hood 12 is concave upward to form a smoke collecting chamber 121, an air inlet 120 is disposed in the central area of the top of the smoke collecting chamber 121, and the air inlet 120 is communicated with the inner cavity of the fan frame 11. The fan system 13 is disposed in the inner cavity of the fan frame 11 and is used for providing negative pressure for sucking and exhausting oil smoke.

The fan system 13 is typically a centrifugal fan, and fig. 4 shows a horizontally disposed centrifugal fan, i.e. the air suction opening of the volute of the centrifugal fan is arranged downward.

Referring to fig. 4, the smoke baffle 70 is generally located below the air inlet 120 of the hood 12 and is usually removably attached to the bottom of the hood 12 (e.g., by a snap-fit or snap-fit connection). The rear side of the smoke barrier 70 is integrally formed with an oil cup 71 extending in the left-right direction, and the smoke barrier 70 is inclined downward from the front to the rear as a whole, whereby oil (oil-water mixture) dropped on the smoke barrier 70 is collected into the oil cup 71 on the rear side by its own weight.

A first through-flow duct 51 for the external smoke to enter the air inlet 120 is formed between the smoke baffle 70 and the inner wall of the smoke collecting cavity 121 of the smoke collecting hood 12. More specifically, the middle portion of the smoke barrier 70 (i.e., the area corresponding to the air inlet 120) is convex downward, so that the cross-sectional area of the first through-flow duct 51 gradually increases along the flow direction of the smoke. Considering the requirement that the smoke baffle 70 guides the oil backwards into the oil cup 71, the cross section (i.e. the vertical section in the left-right direction) of the smoke baffle 70 is substantially V-shaped, and the smoke baffle 70 has a structural design such that the flow rate of the smoke can be reduced at the air inlet 120 during the flow process of the smoke along the first through-flow air duct 51, thereby increasing the contact time between the rotary filter screen 20 and the oil smoke particles in the smoke and improving the oil smoke purification effect.

The arrangement of the V-shaped smoke baffle 70 can also play a role in negative pressure drainage, that is, the smoke can crawl to the left and right side walls along the bottom surface of the smoke baffle 70 under the coanda effect, and is captured quickly at the left and right side inlets of the first through-flow air duct 51 to be sucked into the first through-flow air duct 51, so as to reduce the escape of the oil smoke.

The rotary filter screen 20 is disposed at the air inlet 120 of the smoke collecting hood 12, specifically, is flatly disposed at the air inlet 120. The rotary screen 20 is integrally disc-shaped and can be driven by the driving motor 21 to rotate around its axis.

In order to facilitate the installation of the driving motor 21 and the flow guiding requirement of the flue gas at the air inlet 120, a protective cover 30 is disposed in the inner cavity of the fan frame 11 adjacent to the air inlet 120, and the left and right sides of the protective cover 30 are connected to the side wall of the inner cavity of the fan frame 11 through a fixing frame. The protection cover 30 is a hemispherical cover body which is arched towards the position of the air inlet 120, wherein the arched outer wall surface of the protection cover 30 forms an arc-shaped flow guide surface 31. The top opening of the shield 30 is covered with a cover 32, and the cover 32 also has a convex surface 320 protruding upward for guiding the oil dropping from above (such as the fan system 13) to the surrounding. The cover body 32 and the protective cover 30 are covered to form an installation cavity 33 for installing the driving motor 21, the installation cavity 33 is of a closed structure, external smoke cannot enter the installation cavity, the driving motor 21 is prevented from being invaded by oil smoke, and the service life is prolonged.

The driving motor 21 is installed at the bottom of the inner cavity of the protection cover 30, that is, at the center of the bottom wall of the protection cover 30, and can be fixed by screws. An output shaft of the driving motor 21 is connected to the middle of the rotary screen 20 through the shield 30, so that the rotary screen 20 is rotated by the driving motor 21. The driving motor 21 is electrically connected with the control system of the range hood, and when the fan system 13 of the range hood is switched to the corresponding gear, the driving motor 21 also runs at the matched rotating speed, so that the targeted oil fume purification effect is achieved. For example, when the oil smoke concentration is high, the fan system 13 operates at a high level, and the driving motor 21 correspondingly drives the rotary filter screen 20 to rotate at a high rotation speed; on the contrary, when the oil smoke concentration is small, the fan system 13 operates at a low gear, the driving motor 21 correspondingly drives the rotary filter screen 20 to rotate at a low rotation speed, the driving motor 21 mainly considers the working condition that the oil smoke in the smoke is dominant along with the gear switching of the range hood, and for the working condition that the water vapor in the smoke is dominant, the rotation speed adjustment of the driving motor 21 and the fan system 13 is specifically described below.

A flow guide cover 40 is also arranged in the fan frame 11. The pod 40 is substantially cylindrical and vertically oriented. The bottom port of the air guide sleeve 40 is a first port 41, and the caliber of the first port is substantially consistent with the air inlet 120 of the fume collecting hood 12. The top port of the air guide sleeve 40 is a second port 42, and the caliber of the air guide sleeve is larger than that of the first port 41, so that the air guide sleeve can be connected and fixed with the inner wall of the fan frame 11. As can be seen from fig. 4, the aperture of the air guide sleeve 40 gradually increases from the first port 41 to the second port 42, and a gap is formed between the arc-shaped air guide surface 31 of the protective cover 30 and the inner wall of the air guide sleeve 40, the gap is a second through-flow duct 52 for passing the flue gas, and the cross-sectional area of the second through-flow duct 52 decreases first and then increases along the flow direction of the flue gas.

Grease and other particulate matters in the flue gas are at the in-process by rotary filter 20 interception, because the speed size and the direction of pollutant are not unified, and very complicated, the pollutant speed size and the direction after being intercepted the striking are uncontrollable, some can obtain ascending (to the inside of fan frame 11) speed even, simultaneously still because centrifugal fan's negative pressure effect, can further drive the pollutant and enter into the cavity of fan frame 11, make this kind of dynamic rotary filter 20's filtration mode still have most pollutant can be inhaled in the inner chamber of fan frame 11 from this, the filter effect of oil smoke is limited. In order to solve the above problem, in the embodiment, the second through-flow duct 52 is correspondingly communicated with the first through-flow duct 51 (the first through-flow duct 51 is formed between the smoke baffle 70 and the smoke collecting hood 12) to form a whole through-flow duct, and a pressure reducing area with an increased cross section is formed at the air inlet 120 (that is, at the position of the rotary filter screen 20), that is, during the whole flow process of the smoke entering the fan rack 11 from the outside, the flow speed of the smoke is reduced at the air inlet 120, so that the rotary filter screen 20 can be in full time contact with the smoke particles in the smoke under the condition that the rotation speed of the rotary filter screen 20 is constant, and the smoke purifying effect is further improved. Even if a part of oil smoke particles pass through the rotary filter screen 20 along with the smoke, the oil smoke particles are adsorbed on the arc-shaped flow guide surface 31 of the protective cover 30 with high probability, so that the attachment amount of oil stains on the downstream fan system 13 is further reduced. The flow path of the flue gas is detailed in the hollow arrows shown in fig. 4.

The oil thrown off during the rotation of the rotary filter screen 20 and the oil dripping from the inner wall of the casing 10 and the fan system 13 are guided downward smoothly by the air guide sleeve 40, and then drip onto the back of the smoke barrier 70 and collect into the oil cup 71 at the rear side of the smoke barrier 70.

Referring to fig. 4, the range hood further includes a cold air circulating device for cooling the interior of the installation chamber 33 and the hood 30 itself. Specifically, the cool air circulation device includes a refrigerator 60 for cooling the air, and the refrigerator 60 may employ an air refrigerator 60 conventional in the art, which has an air inlet and an air outlet. The gas outlet of the refrigerator 60 is communicated with the mounting chamber 33 through a first gas pipe 61 so as to convey the gas flow cooled by the refrigerator 60 into the mounting chamber 33, and the gas inlet of the refrigerator 60 is communicated with the mounting chamber 33 through a second gas pipe 62 so as to convey the gas in the mounting chamber 33 into the refrigerator 60 to be cooled again, thereby sequentially forming a cold gas circulation loop. Let in cold air in to installation cavity 33, both can cool down driving motor 21, also can cool down the surface of protection casing 30, condensation oil that can be better after the surface cooling of protection casing 30 drips, water droplet and other granule, also can cool down the flue gas of process equally, reduces the influence of oil smoke to low reaches spare part.

With reference to fig. 4, the range hood of the present embodiment further includes an electrostatic generator 80, wherein the rotary filter 20 is a metal member, and one side of the arc-shaped flow guide surface 31 of the protective cover 30 is also a metal member. The positive electrode of the static electricity generator 80 is electrically connected to the arc guide surface 31 of the shield 30 through the brush 81, and the negative electrode is also electrically connected to the outer peripheral edge portion of the rotary screen 20 through the brush 81. After the static electricity generating device 80 is started, a high-voltage electrostatic field is formed between the rotary filter screen 20 and the arc-shaped flow guide surface 31 of the protective cover 30, and oil smoke particles in the smoke primarily filtered by the rotary filter screen 20 are adsorbed to the surface of the arc-shaped flow guide surface 31 under the action of the electric field force, so that the oil smoke purifying effect is improved.

Under the culinary art operating mode that the oil smoke granule in the flue gas is more (if stir-fry mode), electrostatic adsorption effect is better, and under the culinary art operating mode that the oil smoke granule in the flue gas is less (if cook the mode), electrostatic adsorption effect is not obvious, in order to make electrostatic generator 80 selectively open to the culinary art operating mode of reality, and electrostatic generator 80 is connected with the humidity transducer (not shown) electricity that sets up on the range hood, and wherein, humidity transducer is used for detecting the moisture content in the flue gas. The control system controls the on-off of the static electricity generating device 80 according to the smoke humidity signal transmitted by the humidity sensor, namely, the static electricity generating device 80 is automatically turned on in the stir-frying mode with more oil smoke particles, and the static electricity generating device 80 is automatically turned off in the steaming mode with more water vapor.

Adopt the electrostatic absorption mode to purify the oil smoke, after long-time the use, can accumulate a large amount of greasy dirt on the arc water conservancy diversion face 31 of protection casing 30, not only can lead to electrostatic absorption effect to be influenced, also can influence the second and overflow the mobile effect of the air current in wind channel 52, cause the noise problem to produce, for this reason, need in time clean the arc water conservancy diversion face 31 of protection casing 30, in this embodiment, be switching to under the mode of cooking through range hood, utilize a large amount of vapor to wash the arc water conservancy diversion face 31 of protection casing 30 in the flue gas.

When the humidity sensor detects that the humidity value of the flue gas in the flue gas is greater than the set humidity value, the current cooking mode can be considered as a cooking mode, and the flue gas components are mainly water vapor, so that the surface (absorbing and gathering oil stains) of the arc-shaped guide surface 31 can be cleaned by the water vapor in the flue gas. The humidity sensor, the driving motor 21 and the fan system 13 of the range hood of the embodiment are electrically connected to the control system of the range hood. When the humidity sensor detects that the humidity value of the flue gas is greater than the set humidity value, the control system controls the rotation speed of the driving motor 21 to be alternately increased and decreased, and controls the rotation speed of the fan system 13 to be also alternately decreased and increased, that is, when the rotation speed of the driving motor 21 is at the maximum value, the rotation speed of the fan system 13 is correspondingly adjusted to be minimum, and when the rotation speed of the driving motor 21 is at the minimum value, the rotation speed of the fan system 13 is correspondingly adjusted to be maximum.

When the rotating speed of the fan system 13 is increased and the rotating speed of the driving motor 21 is minimized, the resistance of the air flow flowing through the rotary filter screen 20 is small, the flow speed is large, the arc-shaped flow guide surface 31 of the protective cover 30 can be effectively washed, and the oil stains adsorbed on the arc-shaped flow guide surface 31 are peeled. When the rotating speed of the fan system 13 is reduced and the rotating speed of the driving motor 21 is rotated to the maximum, the middle resistance and the flow speed of the airflow flowing through the rotary filter screen 20 are large, most of the rising steam can be intercepted in the high-speed rotation process of the rotary filter screen 20, and the intercepted steam can be cleaned by the rotary filter screen 20 in the process of being thrown away to the periphery along with the rotary filter screen 20; meanwhile, as the negative pressure of the fan system 13 is reduced, in the process, the oil stain and water drops stripped from the arc-shaped flow guide surface 31 of the protective cover 30 can also drop downwards, and after the oil stain and water drops fall onto the rotary filter screen 20 rotating at high speed below, the oil stain and water drops can also be thrown around under the centrifugal action of the rotary filter screen 20 rotating at high speed, and then the oil stain and water drops downwards under the flow guide action of the flow guide cover 40 and is collected into the oil cup 71 at the rear side of the smoke baffle 70 below, so that the dropped oil stain is prevented from being accumulated on the back side of the rotary filter screen 20. The rotation speeds of the driving motor 21 and the fan system 13 are changed alternately, so that the efficient self-cleaning of the rotating filter screen 20 and the arc-shaped flow guide surface 31 of the protective cover 30 can be realized, and the additional arrangement of the spraying device for cleaning the rotating filter screen 20 and the arc-shaped flow guide surface 31 of the protective cover 30 is not needed, so that the structure of the oil fume purification device of the range hood is simplified, and the production cost is reduced.

Referring to fig. 6, a control method of a range hood includes the following steps:

s1, starting a range hood;

s2, operating the fan system 13, and driving the rotary filter screen 20 to rotate by the driving motor 21;

s3, detecting and acquiring a humidity value in the smoke by a humidity sensor, judging whether the humidity value is smaller than a set humidity value, if so, entering a step S4, and if not, entering a step S5;

s4, mainly treating oil smoke in the current smoke components, starting the static electricity generating device 80 and the cold air circulating device, controlling the driving motor 21 by the control system to drive the rotary filter screen 20 to rotate at a set rotating speed (the rotating speed is matched with an oil smoke concentration value, and the oil smoke concentration can be detected and obtained by an oil smoke concentration sensor), starting the cold air circulating device, and then returning to the step S3;

s5, mainly using water vapor in the current smoke components, closing the static electricity generating device 80 and the cold air circulating device, controlling the rotation speed of the driving motor 21 to be increased and decreased alternately by the control system, and simultaneously controlling the rotation speed of the driving fan system 13 to be decreased and increased alternately, namely, when the rotation speed of the driving motor 21 is at the maximum value, the rotation speed of the fan system 13 is minimum, when the rotation speed of the driving motor 21 is at the minimum value, the rotation speed of the fan system 13 is maximum, and after the operation is carried out for a set time period, then entering the step S6;

and S6, driving the motor 21 to drive the rotary filter screen 20 to rotate at a set rotating speed (the set rotating speed is preset in a control system of the range hood), and operating the fan system 13 at the set rotating speed (the set rotating speed is preset in the control system of the range hood).

Claims (12)

1. A range hood, comprising:

a housing (10) having an air inlet (120);

the rotary filter screen (20) is driven by a driving motor (21) to be rotationally arranged at the air inlet (120);

it is characterized by also comprising:

a shield (30) disposed within the housing (10) along a flue gas flow path, the shield (30) being located downstream of the rotary screen (20), the shield (30) having an arcuate deflector surface (31) arching towards one side of the rotary screen (20);

the driving motor (21) is arranged on one side, deviating from the arc-shaped flow guide surface (31), of the protective cover (30), and an output shaft of the driving motor (21) penetrates through the protective cover (30) to be connected with the rotary filter screen (20).

2. The range hood of claim 1, wherein: one side that protection casing (30) kept away from air intake (120) has uncovered, and this uncovered department is equipped with lid (32), lid (32) with protection casing (30) enclose jointly and close and form confined installation cavity (33), driving motor (21) are located in the installation cavity (33).

3. The range hood of claim 2, further comprising:

the cold air circulating device comprises a refrigerator (60) for cooling air, wherein an air outlet of the refrigerator (60) is communicated with the mounting chamber (33) through a first air conveying pipe (61) so as to convey air flow cooled by the refrigerator (60) into the mounting chamber (33), and an air inlet of the refrigerator (60) is communicated with the mounting chamber (33) through a second air conveying pipe (62) so as to convey the air in the mounting chamber (33) into the refrigerator (60).

4. The range hood according to any one of claims 1 to 3, wherein: the air guide sleeve (40) is further arranged in the machine shell (10), the air guide sleeve (40) is provided with a first port (41) connected with an air inlet (120) of the machine shell (10) and a second port (42) far away from the air inlet (120) and connected with the inner wall of the machine shell (10), the caliber of the air guide sleeve (40) is gradually increased from the first port (41) to the second port (42), a second overflowing air channel (52) for smoke to pass through is formed between the arc-shaped flow guide surface (31) of the protective cover (30) and the inner wall of the air guide sleeve (40), and the sectional area of the second overflowing air channel (52) is firstly reduced and then increased along the smoke flowing direction.

5. The range hood of claim 4, wherein: the air inlet (120) is located at the bottom of the machine shell (10), a smoke baffle plate (70) is further arranged at a position, corresponding to the position below the air inlet (120), of the machine shell (10), and a first overflowing air duct (51) for external smoke to enter the air inlet (120) is formed between the smoke baffle plate (70) and the machine shell (10).

6. The range hood of claim 5, wherein: the area of the smoke baffle (70) corresponding to the air inlet (120) is convex towards the direction far away from the air inlet (120), so that the sectional area of the first overflowing air channel (51) is gradually increased along the flowing direction of the smoke.

7. The range hood of claim 5, wherein: and an oil cup (71) extending along the left-right direction is also arranged at the rear side of the smoke baffle plate (70).

8. The range hood according to any one of claims 1 to 3, wherein: at least the arc-shaped flow guide surface (31) of the rotary filter screen (20) and the protective cover (30) are made of metal; further comprising:

and the anode of the static electricity generating device (80) is connected with the arc-shaped flow guide surface (31) of the protective cover (30), and the cathode of the static electricity generating device is connected with the rotary filter screen (20).

9. The range hood of claim 8, wherein: the device also comprises a humidity sensor for detecting the content of water vapor in the smoke, and the humidity sensor is electrically connected with a control system of the range hood, so that the control system controls the on-off of the static electricity generating device (80) according to a smoke humidity signal transmitted by the humidity sensor.

10. The range hood of claim 9, wherein: the driving motor (21) is electrically connected with a control system of the range hood, so that the control system controls the rotating speed of the driving motor (21) to be alternately increased and decreased when the humidity value of the smoke conveyed by the humidity sensor is larger than a set humidity value.

11. The range hood of claim 10, wherein: the range hood further comprises a fan system (13) arranged in the machine shell (10), wherein the fan system (13) is electrically connected with a control system of the range hood, so that when a humidity value of smoke conveyed by the humidity sensor is larger than a set humidity value, the rotating speed of the fan system (13) is controlled to be alternately reduced and increased, namely when the rotating speed of the driving motor (21) is at the maximum value, the rotating speed of the fan system (13) is at the minimum value, and when the rotating speed of the driving motor (21) is at the minimum value, the rotating speed of the fan system (13) is at the maximum value.

12. A control method of a range hood as claimed in claim 11, characterized by comprising the steps of:

s1, starting a range hood;

s2, operating the fan system (13), and driving the rotary filter screen (20) to rotate by the driving motor (21);

s3, detecting and acquiring a humidity value in the flue gas by a humidity sensor, judging whether the humidity value in the current flue gas is smaller than a set humidity value by a control system, if so, entering a step S4, and if not, entering a step S5;

s4, mainly treating oil smoke in the current smoke components, starting the static electricity generating device (80), controlling the driving motor (21) to drive the rotary filter screen (20) to rotate at a set rotating speed by the control system, and then returning to the step S3;

s5, mainly using water vapor in the current smoke components, closing the static electricity generating device (80), controlling the rotation speed of the driving motor (21) to be increased and decreased alternately by the control system, and simultaneously controlling the rotation speed of the driving fan system (13) to be decreased and increased alternately, namely, when the rotation speed of the driving motor (21) is at the maximum value, the rotation speed of the fan system (13) is at the minimum value, when the rotation speed of the driving motor (21) is at the minimum value, the rotation speed of the fan system (13) is at the maximum value, and after the operation is carried out for a set time, entering the step S6;

s6, driving the motor (21) to drive the rotary filter screen (20) to rotate at the set rotating speed, and operating the fan system (13) at the set rotating speed.

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