CN219572022U

CN219572022U - Range hood with air blocking curtain

Info

Publication number: CN219572022U
Application number: CN202222863229.0U
Authority: CN
Inventors: 任勇; 岑振宙; 陈余恩; 刘阳
Original assignee: Guangdong Chengyi Technology Co ltd
Current assignee: Guangdong Chengyi Technology Co ltd
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-08-22
Anticipated expiration: 2032-10-28

Abstract

The utility model discloses a range hood with a blocking air curtain, which comprises a shell, wherein the shell is provided with an air suction port and an air exhaust port, an oil smoke suction duct is formed by communicating the air suction port and the air exhaust port, a smoke exhaust fan is arranged in the oil smoke suction duct, a panel is arranged on the front side of the shell, a horizontal strip-shaped air suction port and a narrow strip-shaped air curtain air exhaust port which is approximately parallel to the air suction port are arranged on the panel, and induced air exhausted downwards by the air curtain air exhaust port forms an air curtain; compared with the prior art, the range hood with the air blocking curtain can lead induced air to form the air curtain in the vertical direction in the downward discharging process, the air curtain can block the polluted air escaping from the surface of the air flow flowing towards the air suction inlet of the range hood, and the polluted air is sucked into the range hood air duct along with the polluted air flowing towards the air suction inlet when the air curtain is close to the air suction inlet, so that the suction amount of the polluted air by a user is reduced, and the health of the user is prevented from being influenced.

Description

Range hood with air blocking curtain

Technical Field

The utility model relates to the technical field of range hoods, in particular to a range hood with a blocking air curtain.

Background

When a user cooks in a kitchen, a large amount of polluted air is emitted when food materials and oil are mixed in a high-temperature environment, and if harmful pollutants in the polluted air are inhaled by the user for a long time, the health of the user can be affected. The range hood is equipment for sucking polluted air in the cooking process, when a user performs cooking operation, the range hood is started, a negative pressure area is generated at the air suction inlet of the range hood, the polluted air generated in the cooking process can be sucked into the range hood and discharged under the action of negative pressure, and the range hood can clean the air in the cooking environment and reduce the content of harmful substances in the air sucked by the user; but in the process that the polluted air is generated in the cooker and rises to the air suction opening of the range hood, the polluted air can outwards escape under the influence of air flow in the cooking environment, the polluted air at the escape position is far away from a negative pressure area formed by the range hood, the suction force of the range hood on the polluted air is reduced, the polluted air can be downwards diffused and is sucked when being inhaled by a user when being diffused into the air suction range corresponding to the mouth and nose of the user, and the health of the user can be influenced.

Disclosure of Invention

The utility model aims to provide a range hood with a blocking air curtain, which is used for solving the technical problems.

The utility model provides a range hood with separation air curtain, including the casing, the casing is formed with inlet scoop and air exit, communicates inlet scoop and air exit formation oil smoke wind channel, is provided with exhaust fan in the oil smoke wind channel, and the front side of casing is equipped with the panel, sets up the rectangular type of level inlet scoop on the panel to and the narrow strip type air curtain air exit that sets up approximately parallel with the inlet scoop, the induced air that the air curtain air exit was discharged downwards forms the air curtain, and the sum of the length of air curtain air exit is 30% to 90% of the length of inlet scoop.

According to one embodiment of the utility model, the air curtain exhaust outlet is divided into a left section and a right section, the length of the air curtain exhaust outlet is smaller than the width of the air suction inlet, and the sum of the lengths of the left section and the right section of air curtain exhaust outlet is 30% to 90% of the length of the air suction inlet.

According to an embodiment of the present utility model, the air conditioner further comprises at least one induction fan, wherein the induction fan is provided with a grid to form a downward air outlet, the induction fan discharges the induction air downward through the air curtain air outlet, and the air outlet has an air velocity range of 1.5m/s to 12m/s.

According to one embodiment of the utility model, an electric control cavity is formed between the top cover of the shell and the panel, at least one induction fan is arranged in the electric control cavity, the induction fan is used for exhausting air outwards through an air curtain air outlet arranged on the panel to form an air curtain, and a negative pressure area is formed in the electric control cavity.

According to one embodiment of the utility model, the electric control cavity is provided with an access cover, and the access cover is provided with an air inlet hole which is communicated with the electric control cavity.

According to an embodiment of the utility model, the air conditioner further comprises a bypass air assembly, wherein the bypass air assembly comprises a bypass air pipe section, one end of the bypass air pipe section is connected with a smoke outlet of the smoke exhaust fan, air exhausted from the other end of the bypass air pipe section is exhausted by an air curtain air outlet to form an air curtain, and air exhausted from the air curtain air outlet is sucked by the air suction inlet.

According to one embodiment of the utility model, the other end of the bypass air pipe section is provided with a connecting pipe structure, the connecting pipe structure is used for being connected with a smoke outlet of a smoke exhaust fan, the side air pipe section is provided with a check valve and a connecting port, the connecting port is connected with a slender pipeline, and air exhausted by the slender pipeline is exhausted by an air curtain air outlet.

According to one embodiment of the utility model, the smoke exhaust fan is a direct current variable frequency fan, the smoke exhaust fan is connected with the controller, a comparison module is arranged in the controller, and the air quality target value corresponding to the current running condition and the preset condition is compared with the actually detected air quality value, so that the rotating speed of the smoke exhaust fan is adjusted.

According to an embodiment of the present utility model, the range hood further has a PM2.5 detection device, the PM2.5 detection device is configured to detect PM2.5 in air of the cooking environment, and the detected value of the PM2.5 detection device is used to compare with a target value of air quality, so that the controller adjusts the rotation speed of the exhaust fan.

According to an embodiment of the present utility model, the target value includes a first value, a second value, and a third value in order from small to large; when the detection value of the PM2.5 detection device is larger than the first value, starting the range hood; when the detection value of the PM2.5 detection device is larger than the second value, the weighting value of the rotating speed of the smoke exhaust fan is adjusted, and when the detection value of the PM2.5 detection device is larger than the third value, the smoke exhaust fan operates according to the highest grade.

Compared with the prior art, the range hood with the air blocking curtain has the following advantages:

the range hood with the air blocking curtain is characterized in that the air blocking curtain is arranged on the upper side of the range hood, and the air blocking curtain is arranged on the lower side of the range hood.

Drawings

Fig. 1 is a sectional view of a range hood having a blocking air curtain according to the present utility model;

fig. 2 is an exploded view of a casing of the range hood having a blocking air curtain according to the present utility model;

fig. 3 is a schematic structural view of another range hood with a blocking air curtain;

FIG. 4 is a schematic view of the structure of FIG. 3 with portions of the housing removed;

FIG. 5 is a schematic illustration of a bypass wind assembly;

in the figure: 1. the housing, 11, panel, 111, suction inlet, 112, air curtain exhaust, 12, induction fan, 13, electronic control chamber, 14, access cover, 15, induction air hole, 2, exhaust fan, 3, bypass air assembly, 31, bypass air duct section, 311, connection port, 312, take over structure, 313, outer induction duct, 32, check valve, 33, second contaminated air separation device, 34, elongated duct

The implementation and advantages of the functions of the present utility model will be further described with reference to the accompanying drawings.

Detailed Description

Various embodiments of the utility model are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. Moreover, for the purpose of simplifying the drawings, some conventional structures and components are shown in the drawings in a simplified schematic manner.

It should be noted that all directional indicators (such as up, down, left and right, front and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions of the "first," "second," and the like, herein are for descriptive purposes only and are not intended to be specifically construed as order or sequence, nor are they intended to limit the utility model solely for distinguishing between components or operations described in the same technical term, but are not to be construed as indicating or implying any relative importance or order of such features. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

For a further understanding of the nature, features, and efficacy of the present utility model, the following examples are set forth in order to provide a further understanding of the utility model, and are intended to be described in connection with the accompanying drawings:

when a user cooks in a kitchen, a large amount of polluted air is emitted when food materials and oil are mixed in a high-temperature environment, and if harmful pollutants in the polluted air are inhaled by the user for a long time, the health of the user can be affected. The range hood is equipment for sucking polluted air in the cooking process, when a user performs cooking operation, the range hood is started, a negative pressure area is generated at the air suction inlet of the range hood, the polluted air generated in the cooking process can be sucked into the range hood and discharged under the action of negative pressure, and the range hood can clean the air in the cooking environment and reduce the content of harmful substances in the air sucked by the user; but in the process that the polluted air is generated in the cooker and rises to the air suction opening of the range hood, the polluted air can outwards escape under the influence of air flow in the cooking environment, the polluted air at the escape position is far away from a negative pressure area formed by the range hood, the suction force of the range hood on the polluted air is reduced, the polluted air can be downwards diffused and is sucked when being inhaled by a user when being diffused into the air suction range corresponding to the mouth and nose of the user, and the health of the user can be influenced. However, if when the range hood works, the induced air is downwards discharged from one side, close to a user, above the range hood while the air suction inlet sucks the polluted air generated in the cooking process, and forms a vertical air curtain in the downwards discharging process, the air curtain can obstruct the polluted air escaping from the air flow surface flowing towards the air suction inlet of the range hood, and when the air curtain is close to the air suction inlet, the polluted air flowing towards the air suction inlet is sucked into the range hood together with the polluted air, so that the polluted air escaping from the air flow surface flowing towards the air suction inlet of the range hood cannot outwards diffuse into an air suction range corresponding to the mouth and the nose of the user through the air curtain, the suction amount of the polluted air by the user is reduced, and the health of the user is prevented from being influenced.

The utility model provides a range hood which can form a downward air curtain when the range hood works, so that the air curtain forms an air curtain for blocking polluted air from escaping outwards, the polluted air is prevented from escaping to a breathing range corresponding to the mouth and nose of a user, the polluted air is sucked to blow out induced air downwards through one side, which is close to the user, above the polluted air during the working, and the induced air forms a vertical air curtain, so that the air curtain forms the air curtain for blocking the polluted air from escaping outwards, and the sucked air of the user is ensured to accord with health standards. Referring to fig. 1 and 2, the range hood with an air blocking curtain disclosed in the utility model comprises a housing 1, wherein the housing 1 is provided with an air suction opening 111 and an air exhaust opening, the air suction opening 111 and the air exhaust opening are communicated to form an oil smoke suction duct, a smoke exhaust fan 2 is arranged in the oil smoke suction duct, a panel 11 is arranged on the front side of the housing 1, a horizontal long-strip-shaped air suction opening 111 is arranged on the panel 11, and a narrow-strip-shaped air curtain air exhaust opening 112 which is approximately parallel to the air suction opening 111 is arranged on the panel 11, the air curtain air exhaust opening 112 is downwards exhausted to form an induced air curtain, and the sum of the lengths of the air curtain air exhaust openings 112 is 30% to 90% of the length of the air suction opening 111. When the range hood with the air blocking curtain works, the smoke exhaust fan 2 is started, the smoke exhaust fan 2 extracts air in the smoke exhaust air duct and discharges the air outwards, so that negative pressure is formed in the smoke exhaust air duct, the air suction opening 111 is communicated with the smoke exhaust air duct, a large negative pressure is formed at the air suction opening 111, the air around the air suction opening 111 is sucked vertically downwards, and an air suction section is formed in the vertical direction; when a user performs cooking operation, polluted air generated by food materials in the cooker overflows from an opening of the cooker, and because the temperature in the cooker is relatively high, the overflowed polluted air in the cooker forms wholly rising heat convection, and the heat convection flows to the air suction inlet 111 under the influence of a negative pressure area formed by the air suction inlet 111 in the upward flowing process; the suction port 111 is at negative pressure, and the pressure of the cooker is higher than that of the ambient air, so that the polluted air flows from the cooker to the low-pressure area from a higher area in the process of flowing to the suction port 111, an air suction section which is equal to the ambient air exists between the positive pressure area of the cooker and the negative pressure area of the suction port 111, when the polluted air flows through the air suction section which is equal to the ambient air, the suction of the polluted air by the suction port 111 and the baking force of the polluted air by the cooker become smaller, the polluted air on the surface of the hot air easily overflows, at the moment, the air curtain exhaust port 112 of the range hood discharges downwards to induce the air to form an air curtain, the polluted air which prevents the overflow of the hot air on the surface of the cooker continuously flows downwards, and when the polluted air flows through the suction port 111, part of the air flow close to one side of the suction port 111 is sucked into the air suction port 111, the air flow in the air suction port continuously flows downwards along with the air flow in the negative pressure area formed by the suction port 111, and the polluted air in the continuously flows towards the suction port 111 again.

Referring to fig. 1 and 2, the panel 11 of the range hood with the air-blocking curtain of the present utility model is inclined with respect to the back panel of the range hood, and the position of the air inlet 111 is lower than the position of the air outlet 112, so that the distance from the air inlet 111 to the user is greater than the distance from the air outlet 112 to the user, and the escaped polluted air on the heat convection surface of the cooker is blocked by the air curtain formed by the induced air discharged from the air outlet 112, and does not spread into the air suction range corresponding to the nose and the mouth of the user, thereby avoiding affecting the health of the user. The purpose of the induced air exhausted by the air curtain air outlet 112 is to prevent the polluted air escaping from the thermal convection surface formed by the polluted air emitted by the cooker from diffusing into the air suction range corresponding to the mouth and nose of the user, the standing position range of the user is fixed during cooking operation, when the kitchen range corresponding to the range hood is a single-burner kitchen range, the user only places one cooker on the kitchen range during cooking operation, the burner of the kitchen range is positioned at the center position of the kitchen range, at the moment, the air curtain air outlet 112 is arranged at the upper end of the panel 11 and is arranged at the middle position of the panel 11 along the width direction of the panel 11, and the length of the air curtain air outlet 112 is not less than 30% of the length of the air suction outlet 111, so that the air curtain formed by the air curtain air outlet 112 can prevent the polluted air escaping from the thermal convection surface from entering the air suction range corresponding to the mouth and nose of the user; if the length of the air curtain outlet 112 is too short, which is less than 30% of the length of the air inlet 111, the escaped polluted air may enter the air suction range corresponding to the nose and the mouth of the user and be sucked by the user; when the stove is a double-stove, one cooker can be placed on each stove, a user can cook on any cooker, and can also simultaneously start two cookers to cook, at the moment, the air curtain formed by the air curtain air outlet 112 needs to simultaneously block the polluted air escaping from the heat convection surfaces generated by the two cookers, so that the length of the air curtain air outlet 112 needs to extend to the two sides of the air suction inlet 111, and the air curtain formed by induced air exhausted by the air curtain air outlet 112 is enough to block the diffusion of the polluted air escaping from the hot air flow surface formed by any cooker. The number of the air curtain air outlets 112 can be one or more, but because of the space between the two burners of the double-burner stove, the number of the air curtain air outlets 112 is generally two, and gaps exist between the two air curtain air outlets 112, so that the strength of the panel 11 can be enhanced, and the blocking of the air curtain formed by the induced air exhausted by the air curtain air outlets 112 to the polluted air escaping from the heat convection surface generated by the stove can not be influenced. In the illustrated embodiment, the air curtain outlet 112 is divided into left and right sections, the length of which is smaller than the width of the air inlet 111, and the sum of the lengths of the left and right sections of the air curtain outlet 112 is 30% to 90% of the length of the air inlet 111.

In the range hood with the blocking air curtain of the present utility model, the panel 11 has a backward tilting angle ranging from 25 ° to 60 °, and polluted air may generate a coanda effect on the panel 11 and flow along the wall surface of the panel 11 until entering the air suction port 111. The smoke exhaust fan 2 is installed in the upper segment of smoke exhaust duct, the part that the smoke exhaust duct is located in smoke exhaust fan 2 below is the collection wind chamber, the air intake and the collection wind chamber intercommunication of smoke exhaust fan 2, panel 11 is the face that produces an contained angle with the face of perpendicular to top of a kitchen range or the wall of fixed smoke exhaust ventilator and be the acute angle, when the smoke exhaust ventilator is not started, if the user carries out cooking operation, contaminated air can vertically upwards flow earlier, be close to the place of cooking utensil on the top of a kitchen range more contaminated air concentration, the velocity of flow that contaminated air upwards flows is greater, when need change contaminated air flow direction, the required power is also greater, along with the ascending height of contaminated air grow, contaminated air can scatter, the concentration of contaminated air can become low at this moment, the required power of change contaminated air flow direction is less, but the power that all inhales the collection wind chamber with contaminated air that will scatter just is bigger, so when smoke exhaust ventilator installation height is fixed, the power that panel 11 backward tilt scope and the height of inlet scoop 111 can influence smoke exhaust fan 2. The back inclination angle of the panel 11 inclined backward is too small, the flow direction of polluted air is basically parallel to the panel 11, at this time, the change of the flow direction of polluted air needs to consume larger power, the inclination angle of the back inclination angle of the panel 11 is too large, or is directly parallel to the kitchen range, when the polluted air directly rushes against the panel 11, if the position of the panel 11 is too low, the height of the air suction inlet 111 from the kitchen range is low, although the suction effect on the polluted air is better, but the operation of a user is influenced, the position of the panel 11 is too high, the operation of the user is convenient, but the height of the air suction inlet 111 from the kitchen range is too large, the scattering range of the polluted air is larger, the smoke exhaust fan 2 cannot effectively suck the polluted air, the smoke exhaust effect is bad, so that the range of the back inclination angle of the panel 11 is 25 DEG to 60 DEG, that is to say, the range of an included angle formed by the panel 11 and the backboard 12 is 25 DEG to 60 DEG, when the height of the air suction inlet 111 is fixed, the power of the smoke exhaust fan 2 is not used for changing the flow direction of the polluted air greatly, and the work of the smoke exhaust fan 2 can be mostly used for sucking the polluted air into the wind collecting cavity. Due to the backward tilting of the panel 11, when the polluted air moves obliquely upwards under the suction force of the suction opening 111, the polluted air flows along the panel 11 due to the coanda effect after the polluted air contacts with the panel 11, is sucked into the suction opening 111 when flowing through the suction opening 111, and is discharged out of the oil and smoke suction duct through the exhaust opening under the action of the smoke exhaust fan 2.

Further, since the panel 11 is inclined rearward, the downward projection of the suction port 111 is close to the back plate of the range hood and away from the center of the cooker; the heat convection formed by the overflowed polluted air in the cooker is inclined backward as a whole when sucked by the negative pressure of the suction inlet 111 and flows toward the suction inlet 111; the polluted air on the surface of the heat convection flows over in the initial stage of rising, because the heat convection is attracted by the suction force at the air suction inlet 111, the overflowed polluted air is far away from the suction range corresponding to the mouth and nose of a user, and the air pressure of the air suction section formed by the air suction inlet 111 is lower than the cooking environment air pressure, so that in the rising process of the overflowed air flow, the higher the air suction force of the air suction inlet 111 is, the greater the escaped air flow is sucked by the suction force at the air suction inlet 111 after rising to a certain height, and is mixed into the air flow in the air suction section again and sucked into the suction air flue of the range hood, the overflowed polluted air can be prevented from rising into the suction range corresponding to the mouth and nose of the user and being called in by the user, and the health of the user is affected. In addition, because the wind speed of the air suction opening 111 is 9.0m/s to 23m/s, and the height of the cooker from the air suction opening 111 of the range hood is less than 1m, the polluted air generated by the cooker can be quickly sucked into the air suction opening 111 of the range hood, the time for overflowing the polluted air is reduced, and the larger the wind speed at the air suction opening 111 is, the larger the negative pressure generated at the air suction opening 111 is, the negative pressure is far greater than the air pressure of the air in the air suction range corresponding to the nose and the mouth of a user after being influenced by the breathing of the nose and the mouth of the user, so that the overflowed polluted air is sucked again by the air suction opening 111 and mixed into the air flow of the air suction section in the rising process, is sucked into the air suction duct through the air suction opening 111 for sucking the polluted air, and is finally discharged by the smoke exhaust fan 2 through the air outlet. Wherein 9.0m/s is the wind speed reached when the negative pressure generated at the air suction inlet 111 during the lowest-gear operation of the smoke exhaust fan 2 causes the air flow to flow into the air suction inlet 111, and 23m/s is the wind speed reached when the negative pressure generated at the air suction inlet 111 during the highest-gear operation of the smoke exhaust fan 2 causes the air flow to flow into the air suction inlet 111; the user can select the starting gear of the smoke exhaust fan 2 according to the amount of the polluted air generated in the cooking process, and when the negative pressure formed at the air suction inlet 111 during the operation of the lowest gear of the smoke exhaust fan 2 enables the air speed reached when the air flow flows into the air suction inlet 111 to ensure that the overflowed polluted air is sucked into the air suction inlet 111 again, other operation gears of the smoke exhaust fan 2 can still ensure that the overflowed polluted air is sucked into the air suction inlet 111 of the smoke exhaust ventilator.

Referring to fig. 2, the range hood with a blocking air curtain of the present utility model further includes at least one induction fan 12, wherein the induction fan 12 has a grid forming a downward air outlet, the induction fan 12 discharges the induction air downward through the air curtain air outlet 112, and the air outlet 112 has an air outlet velocity ranging from 1.5m/s to 12m/s. When the range hood works, the smoke exhaust fan 2 is started, the air suction port 111 starts to suck polluted air generated by the cooker, meanwhile, the induction fan 12 is started, external air is extracted and the induced air is downwards discharged through the air curtain air outlet 112, the induced air forms an air curtain and blocks the polluted air escaping from the heat convection surface generated by the cooker, and the air quality in the air suction range corresponding to the mouth and nose of a user is ensured to reach the standard. Since the main purpose of the induced fan 12 is to block the polluted air escaping from the heat convection surface by exhausting the induced air through the air curtain exhaust outlet 112, the air outlet speed of the air curtain exhaust outlet 112 cannot be too high, and the excessive air outlet speed of the air curtain exhaust outlet 112 can break up the heat convection flowing from the cooker to the air suction inlet 111, so that the heat convection enters the air suction range corresponding to the nose and the mouth of a user when flowing reversely; the air outlet speed of the air curtain outlet 112 should not be too low, and the too low induced air cannot block the polluted air escaping from the heat convection surface formed by the cooker. Therefore, the range of the air outlet speed of the air curtain air outlet 112 of the range of 1.5m/s to 12m/s of the range of the air exhaust speed of the air curtain air outlet 112 is the range of 1.5m/s to 12m/s, so that induced air flows downwards after being exhausted through the air curtain air outlet 112 and reaches the tail end of a cyclone formed by heat convection formed by polluted air generated by a cooker, and then the heat convection formed by the polluted air generated by the cooker can only flow in one side of the air curtain far away from a user, thereby avoiding the escape of the polluted air.

Referring to fig. 2, in the range hood with a blocking air curtain of the present utility model, an electric control chamber 13 is formed between a top cover of a casing 1 and a panel 11, at least one induction fan 12 is disposed in the electric control chamber 13, the induction fan 12 is exhausted outwards through an air curtain exhaust outlet 112 disposed on the panel 11 to form an air curtain, and a negative pressure region is formed in the electric control chamber 13. When the range hood works, the induction fan 12 is started, the induction fan 12 is used for extracting air in the electric control cavity 13 and discharging the air out of the electric control cavity 13, negative pressure is formed in the electric control cavity 13 after the air in the electric control cavity 13 is extracted by the induction fan 12, and air in a kitchen enters the electric control cavity 13 under the action of the negative pressure to timely supplement the air in the electric control cavity 13. When the kitchen range is a single-burner kitchen range, the number of air curtain air outlets 112 of the range hood can be one, one air curtain air outlet 112 is arranged above the panel 11 and close to one side of a user and is arranged along the width direction of the panel 11, at this time, the electric control cavity 13 is internally provided with an induction fan 12, the induction fan 12 extracts air in the electric control cavity 13, and then the extracted air is downwards discharged through the air curtain air outlets 112 to form an air curtain. However, when the stove is a double-burner stove, if only one air curtain air outlet 112 is arranged on the panel 11, the air curtain air outlet 112 extends along the width direction of the panel 11 at one side of the panel 11 close to a user, at this time, because the length of the air curtain air outlet 112 is longer, if only one induction fan 12 is arranged in the electric control cavity 13, the air quantity at two sides of the air curtain formed by the induced air discharged by the induction fan 12 is thinner, and the polluted air on the hot air flow surface formed by the polluted air discharged by the cooker is easy to escape from two sides of the air curtain; therefore, when the cooker is a double-burner cooker, two sections of air curtain air outlets 112 are arranged on the panel 11 along the width direction of the panel, two induction fans 12 are arranged in the electric control cavity 13, and the air outlet of each induction fan 12 is aligned with one section of air curtain air outlet 112, so that when the range hood works, the two air curtain air outlets 112 form two air curtains, and the two air curtains respectively shield the polluted air escaping from the hot air flow surface formed by the polluted air generated by the cooker at the corresponding side.

Referring to fig. 1 and 2, the range hood with the air blocking curtain of the present utility model has an access cover 14 provided on an electric control chamber 13, an air inlet 15 provided on the access cover 14, and an air suction duct and the air inlet 15 both communicating with the electric control chamber. The induction fan 12 discharges air outwards through an air curtain air outlet 112 arranged on the panel 11; when the induction fan 12 operates, a negative pressure area is formed in the electric control cavity 13, and external air enters the electric control cavity 13 through the air inlet 15. When the range hood works, the smoke exhaust fan 2 is started, polluted air generated in the cooking process of a user enters the smoke exhaust air duct through the air suction opening 111 and is discharged, as the smoke exhaust fan 2 extracts the polluted air in the smoke exhaust air duct, a negative pressure area is formed near the air suction opening 111, the air in the electric control cavity 13 is induced to be extracted by the air induction fan 12, and is discharged through the air curtain air outlet 112 on the panel 11, so that the other negative pressure area is formed in the electric control cavity 13, external air enters the electric control cavity 13 through the air inlet 15, and is extracted by the air induction fan 12 and then is discharged downwards through the air curtain air outlet 112 to form an air curtain, the air flow forming the air curtain is used for downwards impacting the polluted air generated in the cooking process of the user to form a hot air flow, so that the polluted air generated in the cooking process is prevented from continuously rising and being sucked by the user, and the polluted air on the surface of the hot air flow is prevented from escaping into the air suction range corresponding to the mouth and nose of the user.

According to the range hood with the blocking air curtain, the smoke exhaust fan 2 is a direct-current variable-frequency fan, the smoke exhaust fan 2 is connected with the controller, and the comparison module is arranged in the controller, and according to the current running condition of the smoke exhaust fan, and the air quality target value corresponding to the preset condition is compared with the actually detected air quality value, so that the rotating speed of the smoke exhaust fan 2 is adjusted. When a user performs cooking operation, the amount of polluted air generated by cooking different food materials is different, so that the smoke exhaust fan 2 needs to be a direct-current variable-frequency fan, the user can adjust the running rotating speed of the smoke exhaust fan 2 according to the amount of polluted air generated in the cooking process, so that the polluted air generated in the cooking process can be sucked completely, and the power of the smoke exhaust fan 2 is not wasted. However, the user controls the running rotating speed of the smoke exhaust fan 2 according to the polluted air generation amount in the cooking process, so that the method has great subjectivity, and the same polluted air generation amount is different under different judgment conditions of different users; such an operation causes a user with a low rotation speed of the smoke exhaust fan 2 to suck a large amount of polluted air, and causes a large amount of waste of power of the extractor hood for a user with a high rotation speed of the smoke exhaust fan 2. The controller of the range hood with the blocking air curtain is provided with the comparison module, the comparison module is used for comparing the preset air quality target value with the actual air quality detection value, and under the existing running rotating speed of the smoke exhaust fan 2, if the preset control target value is larger than the actual air quality detection value, the fact that the running rotating speed of the smoke exhaust fan 2 is too high under the existing polluted air generating speed is indicated, and the controller can automatically adjust the rotating speed of the smoke exhaust fan 2 during running according to the feedback of the comparison module; if the preset control target value of the smoke exhaust fan 2 is larger than the actual air quality detection value under the existing circle center rotating speed, the fact that the running rotating speed of the smoke exhaust fan 2 is too low under the current polluted air generation speed is indicated, and the controller can automatically adjust the rotating speed of the smoke exhaust fan 2 during running according to feedback of the comparison module.

The range hood with the blocking air curtain is further provided with the PM2.5 detection device, the PM2.5 detection device is used for detecting PM2.5 in the air of the cooking environment, and the detection value of the PM2.5 detection device is used for comparing with the target value of the air quality so that the controller can adjust the rotating speed of the smoke exhaust fan 2. When the range hood works, the PM2.5 detection device detects PM2.5 in the air of the cooking environment in real time, the target value of the comparison module takes the content of PM2.5 as a reference standard, when the content of PM2.5 in the air detected by the PM2.5 detection device is larger than the target value, the condition that more polluted air in the cooking environment escapes is indicated, at the moment, the controller adjusts the rotating speed of the smoke exhaust fan 2 to enable the rotating speed of the smoke exhaust fan 2 to be increased so as to enhance the sucking force on the polluted air generated by cooking, and until the content of PM2.5 in the air detected by the PM2.5 detection device is close to the target value; when the content of PM2.5 in the air detected by the PM2.5 detection device is smaller than the target value, the fact that the polluted air in the cooking environment is sucked is clear is indicated, at the moment, the controller adjusts the rotating speed of the smoke exhaust fan 2, so that the rotating speed of the smoke exhaust fan 2 is reduced, the sucking force of the polluted air generated by cooking is reduced, and the content of PM2.5 in the air detected by the PM2.5 detection device is close to the target value. During the cooking process, the user is concerned with the air quality in the air suction range corresponding to the mouth and the nose of the user, so the air introduced by the air inlet of the PM2.5 detection device comes from the air in the air suction range corresponding to the mouth and the nose of the user; the air quality in the air suction range corresponding to the mouth and the nose of the user is detected and compared with the target value to adjust the rotating speed of the smoke exhaust fan 2, so that the air in the air suction range corresponding to the mouth and the nose of the user can be ensured to meet the health standard of the user.

In this embodiment, the PM2.5 detecting device is disposed at the air inlet of the induction fan 12, and when external air enters the electric control chamber 13 through the air inlet 15 and is sucked by the induction fan 12, the air passes through the PM2.5 detecting device, is detected by the PM2.5 detecting device, is discharged from the air outlet of the induction fan 12, and is finally discharged downwards through the air curtain air outlet 112 to form an air curtain. The PM2.5 detection means is arranged at the air inlet of the induction fan 12, so that the air inlet is not affected, meanwhile, as the air of the cooking environment is extracted by the PM2.5 detection means, the air is above the top of the shell 1, the amount of the polluted air diffused to the air is small, and the detected value of the air can represent the content of the polluted air in the cooking environment by the PM2.5 detection means.

The range hood with the blocking air curtain sequentially comprises a first value, a second value and a third value from small to large; when the detection value of the PM2.5 detection device is larger than the first value, starting the range hood; when the detection value of the PM2.5 detection device is larger than the second value, the weighting value of the rotating speed of the smoke exhaust fan 2 is adjusted, and when the detection value of the PM2.5 detection device is larger than the third value, the smoke exhaust fan 2 operates according to the highest grade. That is, when the PM2.5 detecting device starts to detect the air quality of the cooking environment, the first value of the target value is compared with the result detected by the PM2.5 detecting device, the first value of the target value is the content value of PM2.5 in the air harmless to the health of people, and as long as the air quality value detected by the PM2.5 detecting device is greater than the first value of the target value, the range hood needs to be started, so that the range hood purifies the air of the cooking environment, and at the moment, the range hood 2 adopts low-grade operation; if the concentration of the polluted air discharged in the cooking process suddenly increases, the air quality value detected by the PM2.5 detection device is larger than a second value of the target value, at the moment, the controller adjusts the weighted value of the rotating speed of the smoke exhaust fan 2, so that the rotating speed of the smoke exhaust fan 2 is increased, the suction force of the polluted air in the cooking environment is enhanced, and when the air quality value detected by the PM2.5 detection device is lower than the second value of the target value, the controller can adjust the rotating speed of the smoke exhaust fan 2 again, and the power waste of the smoke exhaust fan 2 is avoided; in the cooking process, if the detected air quality value of the PM2.5 detection device is larger than the third value of the target value, the controller enables the smoke exhaust fan 2 to operate according to the highest grade, and the polluted air of the cooking environment is discharged as soon as possible, so that the content of PM2.5 in the air is reduced, and the influence of the air of the cooking environment on the health of a user is avoided. That is, in the whole cooking process, the comparator can continuously compare the detected air quality value according to the PM2.5 detection device with different target values, and the rotating speed of the smoke exhaust fan 2 is timely adjusted, so that the smoke exhaust ventilator can purify the polluted air in the cooking environment as soon as possible, and meanwhile, the smoke exhaust fan 2 can be prevented from running at a high speed after the polluted air is purified, and the power of the smoke exhaust fan 2 is wasted.

Referring to fig. 3 to 5, in other embodiments, the range hood with a blocking air curtain includes a side ventilation assembly 3, the side ventilation assembly 3 includes a side ventilation pipe section 31, one end of the side ventilation pipe section 31 is connected to the exhaust port of the smoke exhaust fan 2, the air exhausted from the other end is exhausted from the air curtain exhaust port 112 and forms an air curtain, and the exhaust air of the air curtain exhaust port 112 is sucked by the air suction port 111. That is, in the embodiment to be described below, the range hood is not provided with the induction fan 12, but is provided with a bypass air assembly 3, when the range hood is in operation, the exhaust fan 2 is started, the exhaust fan 2 extracts the air in the exhaust duct and discharges the air outwards, when the air is discharged from the discharge port of the exhaust fan 2, a positive pressure area is formed at the discharge port of the exhaust fan 2, and the air at the discharge port of the exhaust fan 2 enters the bypass air duct section 31 under the action of the positive pressure, flows to the other end of the bypass air duct section 31, is discharged through the air curtain air outlet 112, and forms an air curtain. When only one air curtain air outlet 112 is arranged on the panel 11, the number of the bypass air pipe sections 31 can be one, and the air exhausted by one bypass air pipe section 31 is exhausted downwards through the air curtain air outlet 112; when the air curtain air outlet 112 on the panel 11 is two sections of strip-shaped air outlets which are arranged at intervals and are parallel to each other, the number of the bypass air pipe sections 31 is two, one end of each bypass air pipe section 31 is connected with the exhaust port of the smoke exhaust fan 2, and the other end is communicated with the air curtain air outlet 112 on the corresponding side and is exhausted downwards through the air curtain air outlet 112 on the corresponding side to form an air curtain; the side ventilation pipe section 31 may also be a three-way pipe, a first pipe section of which is connected to the exhaust port of the smoke exhaust fan 2, air inlets of the other two pipe sections are respectively communicated with the first pipe section, and air outlets of the other two pipe sections are respectively communicated with an air curtain exhaust port 112. It should be understood that the air discharged from the exhaust port of the smoke exhaust fan 2 is purified air, so that the air entering the side ventilation pipe section 31 is purified air, and the air curtain can be generated without using a separate induction fan 12 which needs to be independently controlled because the exhaust port of the smoke exhaust fan 2 is a positive pressure area, thereby simplifying the structure of the smoke exhaust fan circuit, saving the equipment cost and saving the consumption of electric energy.

Referring to fig. 4 and 5, in the range hood with a blocking air curtain of the present embodiment, a connection pipe structure 312 is disposed at the other end of the bypass air duct section 31, the connection pipe structure 312 is used for connecting with a smoke outlet of the smoke exhaust fan 2, a check valve 32 and a connection port 311 are disposed on the bypass air duct section 31, the connection port 311 is connected with an elongated duct 34, and air exhausted from the elongated duct 34 is exhausted from the air curtain air outlet 112. The exhaust port of smoke exhaust fan 2 is connected to side ventilation pipe section 31 one end, and the other end is provided with takeover structure 312, and takeover structure 312 is including interior bushing pipe portion and joint groove portion, and takeover structure 312 is used for connecting the exhaust port of smoke exhaust fan 2, and the exhaust pipe cup joints on interior bushing pipe portion, has the exhaust pipe of buckle or fixture block structure, and its buckle or fixture block structure can the joint on the joint groove portion of takeover structure 312. The bypass ventilation pipe section 31 is a part of the smoke exhaust air duct, and the smoke exhausted by the smoke exhaust fan 2 enters the smoke exhaust pipe after passing through the bypass ventilation pipe section 31, so the bypass air pipe section 31 is positioned at the downstream of the smoke exhaust fan 2 and is internally provided with a positive pressure area.

Referring to fig. 5, in the range hood with a blocking air curtain of the present embodiment, a connection port 311 is provided on a bypass air pipe section 31, an outer introducing pipe 313 is provided on the outer side of the connection port 311 on the bypass air pipe section 31, and the outer introducing pipe 313 may be integrally formed with the bypass air pipe section 31 or may be a split structure. The outer inlet duct 313 communicates with the air curtain outlet 112 via the elongate duct 34. Because the interior of the side ventilation pipe section 31 is a positive pressure region, the flue gas passing through the side ventilation pipe section can partially enter the air curtain air outlet 112 through the long and thin pipeline 34 and is discharged downwards through the air curtain air outlet 112 to form an air curtain.

Referring to fig. 5, in the range hood with a blocking air curtain of the present embodiment, a connection port 311 of a second polluted air separation device 33 is disposed between a connection pipe structure 312 and a smoke outlet of the smoke exhaust fan 2, and is disposed at a downstream side of the second polluted air separation device 33. The second polluted air separation device 3 makes the air flow discharged by the bypass air assembly 3 through the air curtain air outlet 112 be the air flow after the air-oil separation, so that the air in the air suction range corresponding to the nose and the mouth of the user is prevented from being polluted by the air discharged by the air curtain air outlet 112.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the utility model.

Claims

1. The utility model provides a range hood with separation air curtain, includes casing (1), casing (1) is formed with inlet scoop (111) and air exit, communicates inlet scoop (111) with the air exit forms the oil smoke wind channel be provided with exhaust fan (2) in the oil smoke wind channel, its characterized in that: the front side of the shell (1) is provided with a panel (11), the panel (11) is provided with a horizontal strip-shaped air suction opening (111) and a narrow strip-shaped air curtain air outlet (112) which is arranged approximately in parallel with the air suction opening (111), the induced air discharged downwards by the air curtain air outlet (112) forms an air curtain, and the sum of the lengths of the air curtain air outlet (112) is 30-90% of the length of the air suction opening (111).

2. The range hood with the air blocking curtain according to claim 1, wherein the air curtain exhaust opening (112) is divided into a left section and a right section, the length of the left section and the right section is smaller than the width of the air suction opening (111), and the sum of the lengths of the left section and the right section of the air curtain exhaust opening (112) is 30% to 90% of the length of the air suction opening (111).

3. The range hood with a blocking air curtain according to claim 1, further comprising at least one induction fan (12), wherein the induction fan (12) is provided with a grid-formed downward air outlet, the induction fan (12) discharges the induction air downward through the air curtain air outlet (112), and the air curtain air outlet (112) has an air speed ranging from 1.5m/s to 12m/s.

4. A range hood with a blocking air curtain according to claim 3, characterized in that an electric control cavity (13) is formed between the top cover of the shell (1) and the panel (11), at least one induction fan (12) is arranged in the electric control cavity (13), the induction fan (12) is used for exhausting air outwards through an air curtain air outlet (112) arranged on the panel (11) to form an air curtain, and a negative pressure area is formed in the electric control cavity (13).

5. The range hood with the blocking air curtain according to claim 4, wherein the electric control cavity (13) is provided with an access cover (14), the access cover (14) is provided with an air inlet hole (15), and the air inlet hole (15) is communicated with the electric control cavity.

6. The range hood with the air blocking curtain according to claim 1, further comprising a bypass air assembly (3), wherein the bypass air assembly (3) comprises a bypass air pipe section (31), one end of the bypass air pipe section (31) is connected with a smoke outlet of the smoke exhaust fan (2), air exhausted from the other end is exhausted from the air curtain exhaust outlet (112) and forms an air curtain, and exhaust air of the air curtain exhaust outlet (112) is sucked by the air suction inlet (111).

7. The range hood with the air blocking curtain according to claim 6, wherein a connecting pipe structure (312) is arranged at the other end of the bypass air pipe section (31), the connecting pipe structure (312) is used for being connected with a smoke outlet of the smoke exhaust fan (2), a check valve (32) and a connecting port (311) are arranged on the bypass air pipe section (31), the connecting port (311) is connected with an elongated pipeline (34), and air exhausted by the elongated pipeline (34) is exhausted by the air curtain air outlet (112).

8. The range hood with the air blocking curtain according to any one of claims 1 to 7, wherein the smoke exhaust fan (2) is a direct current variable frequency fan, the smoke exhaust fan (2) is connected with a controller, a comparison module is arranged in the controller, and the rotation speed of the smoke exhaust fan (2) is adjusted by comparing a target air quality value corresponding to the current running condition with an actually detected air quality value according to the current running condition of the smoke exhaust fan and the preset air quality value.

9. The range hood with the blocking air curtain according to claim 8, further comprising a PM2.5 detection means for detecting PM2.5 in the air of the cooking environment, wherein the detected value of the PM2.5 detection means is used for comparison with a target value of air quality, so that the controller adjusts the rotation speed of the smoke exhaust fan (2).