Range hood and control method thereof

Abstract

The invention relates to the technical field of kitchen appliances, in particular to a range hood. The range hood comprises a draught fan assembly, a main draught fan and a fan cover, wherein the draught fan assembly comprises a draught fan shell and a main draught fan arranged in a draught fan cavity of the draught fan shell; the exhaust fume collecting hood is connected to the fan shell and provided with an exhaust fume collecting cavity, and the exhaust fume collecting cavity is provided with a fume suction opening and a fume outlet communicated with the fan cavity; the air curtain assembly comprises an air supply structure and an air nozzle capable of swinging up and down, the air supply structure is mounted on the exhaust fume collecting hood, and the air nozzle extends into the exhaust fume collecting cavity and is configured to blow air to form an air curtain which extends horizontally or inclines upwards relative to the horizontal direction; an air curtain assembly is arranged on at least one side in the left-right direction of the smoke collecting cavity. When the range hood is used, the smoke blocking air curtain can be used for blocking the side, so that main airflow generated under the action of the fan enters from the side, corresponding to the furnace end, of the smoke suction port, the range hood can realize single-side smoke suction, and the vertical air volume of the smoke blocking air curtain can be superposed to the main airflow, so that the single-side smoke suction effect of the range hood is improved.

Description

Technical Field

[0001] This application relates to the field of kitchen appliance technology, and in particular to a range hood and its control method. Background Technology

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. It is installed above the kitchen stove to remove cooking fumes and exhaust them outdoors.

[0003] Currently, when a range hood is working, the smoke inlet of the smoke collection chamber corresponds to the two burners of the stove. When both burners are working, the smoke inlet draws in the fumes from both burners. However, in some scenarios, only one burner of the stove is working. In this case, the smoke inlet of the range hood only needs to draw smoke from one side. Since the airflow of the range hood cannot be evenly distributed from side to side, the smoke extraction effect on one side of the range hood is poor, and there is a waste of suction power. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a range hood and its control method, which utilizes the nozzles of an air curtain assembly to blow air into the smoke collection chamber to form a horizontally extending or equivalently horizontally inclined air curtain. This air curtain alters the airflow pattern at the range hood's air inlet, achieving left-right airflow distribution and improving the smoke extraction effect on one side of the range hood.

[0005] This application provides a range hood, including: A fan assembly includes a fan housing and a main fan disposed within a fan cavity of the fan housing; A smoke hood is connected to the fan housing and has a smoke collection chamber, which has a smoke inlet and a smoke outlet communicating with the fan chamber. An air curtain assembly includes an air supply structure and a nozzle that can swing up and down. The air supply structure is mounted on the smoke collection hood, and the nozzle extends into the smoke collection chamber and is configured to blow air to form an air curtain that extends horizontally or tilts upward relative to the horizontal direction. The air curtain assembly is provided on at least one side of the smoke collection chamber in the left-right direction.

[0006] The nozzles can blow air to form an air curtain. When the burner on one side of the smoke inlet is working, the nozzles on the other side can blow air to form an air curtain. By using the smoke-blocking air curtain to block the airflow on that side, the main airflow generated by the main fan can enter from the side of the smoke inlet corresponding to the burner. This allows the range hood to achieve unilateral smoke extraction. Furthermore, the vertical airflow of the smoke-blocking air curtain can be superimposed on the main airflow, thereby improving the unilateral smoke extraction effect of the range hood.

[0007] Furthermore, the air curtain is positioned on the sides of the smoke collection chamber, where the airflow is relatively weak. Therefore, when the angle of the air curtain increases, it guides the smoke, enhancing the smoke extraction effect on the side where the air curtain is located. Especially when air curtain components are installed on both sides of the smoke collection chamber, and when there is a large amount of smoke on both sides, the airflow from the two nozzles forms a guiding air curtain, which then overlaps with the main airflow, enhancing the overall smoke extraction effect of the range hood.

[0008] In some embodiments, in the left-right direction of the smoke hood, the length of the air curtain is less than or equal to half the length of the smoke collection chamber at the location where the air nozzle is provided.

[0009] When the smoke extraction machine is drawing smoke from only one side, an air curtain is used to block the other side. This allows the main airflow generated by the fan to enter the smoke collection chamber from the side corresponding to the working burner head. In this case, the air curtain needs to block as much of the other side as possible. Preferably, the length of the air curtain is equal to half the length of the smoke collection chamber at the location of the air nozzle. Of course, the length of the air curtain can also be less than half the length of the smoke collection chamber at the location of the air nozzle. In this case, the other side is not completely blocked, allowing the fumes escaping to that side to enter the smoke collection chamber through the portion of that side that is not blocked by the air curtain.

[0010] In some embodiments, the smoke hood includes two inner side plates spaced apart from each other, with the two inner side plates forming the smoke collection chamber, and the inner side plates have clearance holes for the air nozzle to swing. The inner panel includes an air guide plate that is inclined at a preset angle relative to the horizontal direction. In the left-right direction of the smoke hood, the upper end of the air guide plate is closer to another inner panel than the lower end. The air nozzle is located on the lower side of the air guide plate. The maximum angle at which the air curtain tilts relative to the horizontal direction is the preset angle.

[0011] Due to the design of the air guide plate on the inner panel, which is tilted at a preset angle relative to the horizontal direction, the blowing angle of the nozzle is limited to a preset angle. In other words, the maximum blowing angle of the nozzle is the preset angle, at which point the air curtain moves along the air guide plate. Because the airflow on the left and right sides of the smoke collection chamber is weak due to the fan's action, the air curtain is positioned here. When the air curtain is tilted at the preset angle, it enhances the airflow intensity at the air guide plate, thereby improving the smoke extraction effect.

[0012] In some embodiments, the smoke hood further includes two outer side panels spaced apart from each other, and an inner side panel is located between the two outer side panels, with the inner side panel and the outer side panels forming a mounting cavity; The air supply structure is disposed in the mounting cavity.

[0013] By creating an installation cavity between the inner and outer panels, the impact of oil fumes on the air supply structure can be reduced, and the air supply structure can be repaired by disassembling the outer panels.

[0014] In some embodiments, the air supply structure further includes an inner cylinder having an air cavity and rotatable about its own axis, the air nozzle being connected to the inner cylinder, the inner cylinder being fitted to the inner side plate and always covering the clearance hole.

[0015] The inner cylinder can drive the air nozzle to rotate, and since the inner cylinder always covers the clearance hole, it can prevent oil fumes from entering the installation cavity through the clearance hole, thereby isolating the oil fumes and preventing the air supply structure from being affected by the oil fumes.

[0016] In some embodiments, the air outlet of the nozzle is configured as a flat opening, and the length direction of the air outlet is perpendicular to the left-right direction of the smoke collection hood; And / or, the range hood further includes an oil fume detection component, which is disposed on the smoke collection hood or the fan housing, and is used to detect the oil fume index on the left and right sides of the smoke collection chamber.

[0017] The nozzle features a flat outlet design, which provides a uniform and continuous air curtain and avoids whistling sounds.

[0018] The tilt angle of the air curtain can be adjusted based on the oil fume index on both sides using the oil fume detection component.

[0019] This application also provides a control method for a range hood, applicable to the above-mentioned range hood, wherein the smoke collection chamber has a first smoke collection area and a second smoke collection area in the left-right direction, and the air curtain assembly is provided and is arranged corresponding to the first smoke collection area; The control method for the range hood includes: Detect and compare the oil fume index of the first smoke collection area and the second smoke collection area; If the oil fume index of the second smoke collection area is greater than that of the first smoke collection area, the nozzle is controlled to blow air to form an air curtain that is tilted at a first preset angle relative to the horizontal direction, so as to block at least part of the first smoke collection area. If the oil fume index of the second smoke collection zone is less than or equal to the oil fume index of the first smoke collection zone, then the nozzle is controlled to not blow air, or blow air to form an air curtain that is tilted at a second preset angle relative to the horizontal direction in order to guide the oil fume. The second preset angle is greater than the first preset angle, and the first preset angle is greater than or equal to 0°.

[0020] The angle of the air curtain can be adjusted according to the oil fume index of the smoke collection areas on both sides. The wind-blocking effect of the air curtain can be used to enhance the smoke extraction effect on the other side. In addition, the air-guiding effect of the air curtain can be used to strengthen the weak area on the side of the smoke collection chamber, thereby improving the smoke extraction effect on the side where the air curtain component is installed.

[0021] This application also provides a control method for a range hood, applicable to the aforementioned range hood; The smoke collection chamber has a left smoke collection area and a right smoke collection area in the left-right direction, and the air curtain assembly is provided in two parts, corresponding to the left smoke collection area and the right smoke collection area respectively; The control method for the range hood includes: Detect and compare the oil fume index of the left smoke collection area and the right smoke collection area; If the difference between the two sides of the oil fume index is greater than the first set value, the nozzle on the side with the smaller oil fume index is controlled to blow air to form an air curtain that is tilted at a first preset angle relative to the horizontal direction, so as to block at least part of that side; the nozzle on the side with the larger oil fume index is controlled not to blow air, or the nozzle is controlled to blow air to form an air curtain that is tilted at a second preset angle relative to the horizontal direction, so as to guide the oil fume. If the difference in the oil fume index between the two sides is less than or equal to the first set value, then control each nozzle to not blow air, or control each nozzle to blow air to form an air curtain that is tilted at a second preset angle relative to the horizontal direction in order to guide the oil fumes. The second preset angle is greater than the first preset angle, and the first preset angle is greater than or equal to 0°.

[0022] The angle of the air curtain can be adjusted according to the oil fume index of the smoke collection areas on both sides. The wind-blocking effect of the air curtain can be used to enhance the smoke extraction effect on the other side. In addition, the air-guiding effect of the air curtain can be used to strengthen the weak area on the side of the smoke collection chamber, thereby improving the smoke extraction effect on the side where the air curtain component is installed.

[0023] In some embodiments, the smoke hood includes two inner side plates spaced apart from each other, with the smoke collection chamber formed between the two inner side plates, and the inner side plates include air guide plates tilted at a set angle relative to the horizontal direction; The nozzle is located on the lower side of the air guide plate, and the second preset included angle is equal to the set angle.

[0024] The air guide plate guides the fumes, creating a weak zone at the air guide plate. The air guide plate also limits the tilt angle of the air curtain to no more than a set angle. By selecting the second preset angle as the set angle, the presence of the air curtain strengthens the weak zone, thereby enhancing the smoke extraction effect on that side.

[0025] This application also provides a control method for a range hood, applicable to the aforementioned range hood; The smoke collection chamber has a left smoke collection area and a right smoke collection area in the left-right direction, and the air curtain assembly is provided in two parts, corresponding to the left smoke collection area and the right smoke collection area respectively; The control method for the range hood includes: Detect the oil fume index of the left smoke collection area and the right smoke collection area; If the oil fume index on both sides is greater than or equal to the first set oil fume index, then control each nozzle to not blow air, or control each nozzle to blow air at the maximum wind speed to form an air curtain that is tilted at a second preset angle relative to the horizontal direction in order to guide the oil fume. If the oil fume index on both sides is less than the first set oil fume index, then control each nozzle to not blow air, or control each nozzle to blow air at the maximum wind speed of N1 times to form an air curtain tilted at a second preset angle relative to the horizontal direction to guide the oil fume, 0 < N1 ≤ 1.

[0026] The angle of the air curtain can be adjusted according to the oil fume index of the smoke collection areas on both sides. The wind-blocking effect of the air curtain can be used to enhance the smoke extraction effect on the other side. In addition, the air-guiding effect of the air curtain can be used to strengthen the weak area on the side of the smoke collection chamber, thereby improving the smoke extraction effect on the side where the air curtain component is installed. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a three-dimensional structural diagram of a range hood provided in an embodiment of this application; Figure 2 for Figure 1 Schematic diagram of the smoke collection hood of the range hood Figure 1 ; Figure 3 for Figure 1 Schematic diagram of the smoke collection hood of the range hood Figure 2 ; Figure 4 for Figure 1 A schematic diagram of the smoke collection hood of a range hood (with the front panel removed); Figure 5 for Figure 1 A schematic diagram of the internal structure of the smoke collection hood of a range hood; Figure 6 for Figure 1 Schematic diagram of the air curtain of the range hood Figure 1 ; Figure 7 for Figure 1 Schematic diagram of the air curtain of the range hood Figure 2 ; Figure 8 for Figure 1 Schematic diagram of the air curtain of the range hood Figure 3 ; Figure 9 for Figure 1 A schematic diagram of the air curtain assembly of a range hood; Figure 10 for Figure 9 A partial structural diagram of the air curtain component; Figure 11 for Figure 10 A cross-sectional view; Figure 12 for Figure 10 A partial structural diagram.

[0030] Among them, 1. fan assembly; 11. fan casing; 2. Smoke hood; 2a. Smoke collection chamber; 2b. Mounting chamber; 21. Inner side panel; 211. Air guide plate; 22. Outer side panel; 23. Top plate; 231. Air outlet; 24. Front cover plate; 25. Air inlet grille; 26. Front panel; 27. Rear cover plate; 3. Air curtain assembly; 31. Air supply structure; 311. Air inlet duct; 312. Drive unit; 313. Inner cylinder; 314. Outer cylinder; 315. Auxiliary fan; 32. Air nozzle; 321. Air outlet; 4. Oil fume detection component. Detailed Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0033] Currently, when a range hood is working, the smoke inlet of the smoke collection chamber corresponds to the two burners of the stove. When both burners are working, the smoke inlet draws in the fumes from both burners. However, in some scenarios, only one burner of the stove is working. In this case, the smoke inlet of the range hood only needs to draw smoke from one side. Since the airflow of the range hood cannot be evenly distributed from side to side, the smoke extraction effect on one side of the range hood is poor, and there is a waste of suction power.

[0034] Based on this, this application provides a range hood that, by setting an air curtain assembly, has a nozzle extending into the smoke collection chamber from the left and right sides of the chamber. The nozzle blows air to form a horizontal or relatively horizontal upward-sloping air curtain, which partially blocks the smoke inlet. Furthermore, the vertical airflow of the air curtain can enhance the flow velocity on the other side, thereby achieving airflow distribution of the range hood, enabling unilateral smoke extraction, and improving the smoke extraction effect.

[0035] Moreover, there is no need to install mechanical structures in the smoke collection chamber, which avoids the mechanical structures affecting the smoke extraction effect on both sides of the range hood and also avoids noise generation.

[0036] The following reference Figures 1 to 12 The range hood provided in the embodiments of this application will be described in detail.

[0037] Reference Figures 1 to 5 As shown, some embodiments of this application provide a range hood, which includes a fan assembly 1. The fan assembly 1 includes a fan housing 11 and a main fan disposed within the fan cavity of the fan housing 11. The main fan is used to generate suction to extract cooking fumes, which enter through the air inlet of the fan housing 11 and are then discharged through the air outlet 321 of the fan housing 11.

[0038] The range hood also includes a smoke collection hood 2, which is connected to the fan housing 11. The smoke collection hood 2 has a smoke collection chamber 2a, which has a smoke inlet and a smoke outlet connecting to the fan chamber. The smoke collection hood 2 is used to collect smoke. Under the action of the main fan, the fumes are drawn into the smoke collection chamber 2a through the smoke inlet and enter the fan chamber through the smoke outlet of the smoke collection chamber 2a.

[0039] The range hood also includes an air curtain assembly 3, which includes an air supply structure 31 and a nozzle 32 that can swing up and down. The air supply structure 31 is installed on the smoke collection hood 2, and the nozzle 32 extends into the smoke collection chamber 2a. The nozzle 32 is configured to blow air to form an air curtain that extends horizontally or tilts upward relative to the horizontal direction.

[0040] At least one side of the smoke collection chamber 2a in the left and right directions is provided with an air curtain assembly 3.

[0041] Understandably, the nozzle 32 can blow air to form an air curtain. When the burner of the stove on one side of the smoke inlet is working, the nozzle 32 on the other side can blow air to form an air curtain. By using the smoke-blocking air curtain to block that side, the main airflow generated by the main fan enters from the side of the burner corresponding to the smoke inlet. This allows the range hood to achieve unilateral smoke extraction. Furthermore, the vertical airflow of the smoke-blocking air curtain can be superimposed on the main airflow, thereby improving the unilateral smoke extraction effect of the range hood.

[0042] It should be noted that when the air curtain is tilted, it has both horizontal and vertical components. The smaller the tilt angle of the air curtain, the larger the horizontal component and the smaller the vertical component, resulting in a strong blocking effect. However, when the tilt angle of the air curtain increases, the horizontal component decreases while the vertical component increases. In this case, the enhancing effect of the vertical component exceeds the blocking effect of the horizontal component, and the air curtain can enhance the smoke-absorbing effect on the same side.

[0043] Furthermore, the air curtain is positioned on the sides of the smoke collection chamber 2a in the left and right directions, where the airflow field is relatively weak. Therefore, when the angle of the air curtain increases, it acts as a smoke guide, enhancing the smoke extraction effect on the side where the air curtain is located. Especially when air curtain components 3 are installed on both sides of the smoke collection chamber 2a, and when there is a large amount of oil smoke on both sides, the air blown by the two nozzles 32 can form a smoke-guiding air curtain, which then overlaps with the main airflow, enhancing the overall smoke extraction effect of the range hood.

[0044] It should be noted that the air curtain does not completely block airflow from entering from one side. This is related to the airflow velocity, length, and tilt angle of the air curtain. Specifically, taking the air curtain formed by the right-side nozzle 32 as an example, when the air curtain extends horizontally, it blocks external air from entering the smoke collection chamber 2a from the right side within its length. When the air curtain is tilted relative to the horizontal direction, it provides lateral airflow to counteract the suction of the main fan, preventing external air from entering the smoke collection chamber 2a from the right side. The vertical component provided by the air curtain is superimposed on the main airflow of the main fan. Thus, not only is unilateral smoke extraction achieved on the left side, but the smoke extraction effect on the left side is also enhanced. However, the right side still has a certain smoke extraction effect, except that the airflow entering from the right side enters along the left side of the air curtain or from the left side of the smoke collection chamber 2a.

[0045] In this process, it is necessary to ensure that the lateral airflow of the air curtain can offset the original flow rate on the right side of the smoke inlet under the action of the main fan. Therefore, the air velocity blown out by the nozzle 32 must be higher than the air velocity on the right side of the smoke inlet under the action of the main fan, so as to ensure that the air curtain can stably block the air from entering from the right side of the smoke inlet.

[0046] For example, when the tilt angle of the air curtain is the first preset angle, the air curtain can at least partially block the smoke on the side where it is located. In this case, the air curtain mainly serves to block the fumes, thus weakening the smoke extraction effect on that side while strengthening the smoke extraction effect on the other side. When the tilt angle of the air curtain is the second preset angle, the air curtain can guide the fumes, thereby strengthening the smoke extraction effect on the side where the air curtain is located.

[0047] It should be noted that both the first and second set angles are acute angles. Furthermore, the first and second set angles are not specific values, but rather angular ranges. For example, the first set angle may be greater than or equal to 0°, while the second set angle may be greater than the first set angle. The maximum value of the first set angle is less than the minimum value of the second set angle.

[0048] For example, taking the air curtain on the left side of the smoke collection chamber 2a as an example, if the maximum swing angle of the air nozzle 32 is 60°, then when the air curtain is mainly needed to play a blocking role, the swing angle α of the air curtain can be set between 0° and 30°. Figure 6 and Figure 7 As shown, when the air curtain angle is 0°, the air curtain extends horizontally, and its blocking effect is optimal. However, when the air curtain angle is greater than 0° and less than or equal to 30°, the blocking effect gradually weakens as the angle increases. In this case, air from the left side is guided by the air curtain to enter from the right side, or when the length of the air curtain is insufficient to completely cover the left side, air from the left side enters from the right side of the air curtain. When the air curtain is primarily used for smoke guidance, the swing angle β of the air curtain can be set between 50° and 60°, preferably 60°. Figure 8 As shown, at this time, the air curtain mainly plays the role of strengthening the weak area on the left side of the smoke collection chamber 2a, driving the oil fumes to enter and flow to the fan chamber quickly, thereby improving the smoke extraction effect on the left side.

[0049] In some embodiments, the range hood further includes an oil fume detection component 4, which is disposed on the smoke collection hood 2 or the fan housing 11, and is used to detect the oil fume index on the left and right sides of the smoke collection chamber 2a. The tilt angle of the air curtain is then adjusted based on the oil fume index on both sides.

[0050] For example, refer to Figure 1 The fume detection component 4 can be installed on the fan housing 11. In this case, the fume detection component 4 can be selected as an infrared sensor. Two sets of infrared sensors are installed on the fan housing 11, located on the left and right sides respectively, corresponding to the two burners of the stove. By detecting the temperature change inside the pot on the stove, the sensor is compared with the temperature data curve stored in the system to calculate the amount of fume to be generated.

[0051] Alternatively, the fume detection component 4 can be selected as a temperature sensor, which is installed on the fan housing 11 or the fume collection hood 2. It can also be selected as a smoke sensor to directly measure the smoke content in the corresponding area to determine the amount of fume.

[0052] This application does not impose specific restrictions on the configuration of the oil fume detection component 4, as long as it can achieve the detection of oil fumes, and will not list them one by one.

[0053] In some embodiments, in the left-right direction of the smoke hood 2, the length of the air curtain is less than or equal to half the length of the smoke collection chamber 2a at the location where the air nozzle 32 is provided.

[0054] Understandably, when the smoke extraction machine is drawing smoke from only one side, an air curtain is used to block the other side, allowing the main airflow generated by the fan to enter the smoke collection chamber 2a from the side corresponding to the working burner head. In this case, the air curtain needs to block as much of the other side as possible; preferably, the length of the air curtain is equal to half the length of the smoke collection chamber 2a at the location of the air nozzle 32. Of course, the length of the air curtain can also be less than half the length of the smoke collection chamber 2a at the location of the air nozzle 32. In this case, the side is not completely blocked, allowing the fumes escaping to that side to enter the smoke collection chamber 2a through the portion not blocked by the air curtain.

[0055] It should be noted that the length of the aforementioned air curtain can also be set to be greater than 1 / L of the length of the smoke collection chamber 2a at the location of the nozzle 32. L can be a positive number, such as 1, 1.5, 2, 2.5, 3, etc. (L can be set according to actual needs and is not specifically limited here) to ensure the blocking effect and improve the smoke extraction effect when the range hood is used for single-sided smoke extraction. Furthermore, the length of the air curtain can be adjusted in real time during operation according to the smoke index on both sides, such as increasing or decreasing the air curtain length based on the amount of smoke.

[0056] It should also be noted that when the air velocity blown out by the nozzle 32 is less than the air velocity generated by the fan, the air curtain effect is poor or it becomes ineffective. Therefore, the air velocity blown out by the nozzle 32 must be greater than the air velocity generated by the main fan, and the stability of the air curtain must also be ensured. Thus, the air velocity blown out by the nozzle 32 is usually set to 3-5 times the air velocity generated by the main fan. No specific limit is made here, and the specific value range can be determined through experiments according to different usage scenarios.

[0057] In some embodiments, refer to Figure 4 and Figure 5 The smoke hood 2 includes two inner side plates 21 spaced apart on the left and right, forming a smoke collection chamber 2a between the two inner side plates 21. The inner side plates 21 are provided with clearance holes for the air supply nozzle 32 to swing.

[0058] The inner panel 21 includes an air guide plate 211 tilted at a preset angle relative to the horizontal direction. In the left-right direction of the smoke hood 2, the upper end of the air guide plate 211 is closer to the other inner panel 21 than the lower end. The air nozzle 32 is located below the air guide plate 211. The maximum angle at which the air curtain is tilted relative to the horizontal direction is a preset angle.

[0059] Understandably, due to the arrangement of the air guide plate 211 on the inner plate 21, the air guide plate 211 is tilted at a preset angle relative to the horizontal direction. This also limits the blowing angle of the nozzle 32 to not exceed the preset angle. In other words, the maximum blowing angle of the nozzle 32 is the preset angle, at which point the air curtain moves along the air guide plate 211. Moreover, the tilted arrangement of the air guide plate 211 makes the flow field on the left and right sides of the smoke collection chamber 2a weaker. When the tilt angle of the air curtain is the preset angle, the flow field intensity at the air guide plate 211 can be enhanced, increasing the flow velocity at this point, thereby improving the smoke extraction effect.

[0060] It should be noted that, generally speaking, the two inner side plates 21 form the left and right boundaries of the smoke outlet of the smoke collection chamber 2a. At this time, the air guide plate 211 plays the role of air guiding, so that the oil fumes enter the fan chamber of the fan housing 11 along the air guide plate 211. When the angle of the air curtain is the preset angle, the air curtain can achieve the best air guiding effect and improve the smoke extraction effect on the side with the air curtain.

[0061] For example, the preset angle is 60°, so when an air curtain is needed to enhance the smoke extraction effect on one side of the range hood, the tilt angle of the air curtain is 60°. Of course, the preset angle can also be set according to actual needs, and no specific limitation is made here.

[0062] Furthermore, the smoke hood 2 also includes at least one mounting cavity 2b separated from the smoke collection chamber 2a, and the air supply structure 31 is disposed in the mounting cavity 2b.

[0063] Understandably, by setting up the installation cavity 2b, which is separated from the smoke collection cavity 2a, the impact of oil fumes on the air supply structure 31 can be reduced, thereby improving the service life of the air supply structure 31.

[0064] Among them, reference Figure 4 and Figure 5 The smoke hood 2 also includes two outer side panels 22 spaced apart on the left and right, and an inner side panel 21 located between the two outer side panels 22. The inner side panel 21 and the outer side panels 22 form an installation cavity 2b, and the air supply structure 31 is located in the installation cavity 2b.

[0065] The mounting cavity 2b formed by the inner plate 21 and the outer plate 22 not only reduces the impact of oil fumes on the air supply structure 31, but also allows for maintenance of the air supply structure 31 by disassembling the outer plate 22.

[0066] Among them, reference Figures 9 to 11 The air supply structure 31 also includes an inner cylinder 313 with an air chamber that can rotate around its own axis. The air nozzle 32 is connected to the inner cylinder 313. The inner cylinder 313 is attached to the inner side plate 21 and always covers the clearance hole.

[0067] Understandably, the inner cylinder 313 can drive the nozzle 32 to rotate, and since the inner cylinder 313 always covers the clearance hole, oil fumes can be prevented from entering the mounting cavity 2b through the clearance hole, thereby isolating the oil fumes and preventing the air supply structure 31 from being affected by the oil fumes.

[0068] Furthermore, the air supply structure 31 also includes a drive unit 312, an outer cylinder 314, an air inlet pipe 311, and a secondary fan 315. The drive unit 312 drives the inner cylinder 313 to rotate. The air outlet of the air inlet pipe 311 connects to the inner cavity of the outer cylinder 314. The inner cylinder 313 is rotatably disposed within the outer cylinder 314, and the air chamber of the inner cylinder 313 is always connected to the inner cavity of the outer cylinder 314. This allows airflow to be delivered to the air nozzle 32 via the air inlet pipe 311, the outer cylinder 314, and the inner cylinder 313 during the rotation of the inner cylinder 313, thus enabling the air nozzle 32 to oscillate.

[0069] The aforementioned auxiliary fan 315 is installed inside the air inlet pipe 311 to draw air and deliver it to the air nozzle 32. Thus, under the action of the auxiliary fan 315, the airflow entering through the air inlet hole of the air inlet pipe 311 is delivered to the air nozzle 32 via the outer cylinder 314 and the inner cylinder 313, and the driving component 312 can drive the inner cylinder 313 to rotate, thereby causing the air curtain formed by the air nozzle 32 to change relative to the horizontal direction.

[0070] The auxiliary fan 315 can be selected as an axial flow fan, a centrifugal fan, etc., without specific restrictions.

[0071] Reference Figure 4 and Figure 5 The aforementioned fume hood 2 also includes a top plate 23, with an air inlet pipe 311 connected to the top plate 23, and an air inlet 231 corresponding to the air inlet hole of the air inlet pipe 311. In this way, the air supply structure 31 takes in air from the top of the fume hood 2, which can prevent the entry of external oil fumes and improve the service life of the air supply structure 31.

[0072] It should be noted that the top plate 23 can be separately installed from the outer panel 22, but can be connected to form a single unit. Alternatively, the top plate 23 can also be integrally installed with the outer panel 22, which reduces the number of parts and assembly steps.

[0073] For example, refer to Figures 2 to 5 The smoke collection hood 2 also includes a rear cover plate 27 and a front cover plate 24. The rear cover plate 27 is located behind the front cover plate 24. The front cover plate 24, the rear cover plate 27 and the two inner side plates 21 surround to form the smoke collection cavity 2a.

[0074] In addition, the smoke hood 2 also includes an air inlet grille 25, which is disposed at the air inlet of the smoke collection chamber 2a. The smoke hood 2 also includes a front panel 26, which is disposed on the front side of the front cover plate 24. The front panel 26 covers the mounting cavity 2b, that is, the front panel 26, the inner side plate 21, the outer side plate 22, and the rear cover plate 27 together form the aforementioned mounting cavity 2b.

[0075] The inner side plate 21 is connected to the top plate 23 and also to the fan housing 11. The rear cover plate 27 is connected to the fan housing 11. The front cover plate 24 is connected to the fan housing 11.

[0076] In some embodiments, refer to Figure 12 The air outlet 321 of the above-mentioned nozzle 32 is set as a flat opening, and the length direction of the air outlet 321 is perpendicular to the left and right direction of the smoke hood 2.

[0077] Understandably, the air outlet 321 of the nozzle 32 adopts a flat opening design, which can provide a uniform and continuous air curtain and avoid whistling sounds.

[0078] This application also provides a control method for a range hood, applicable to the range hood described in the above embodiments.

[0079] Taking an example where only one air curtain component 3 is installed. In this case, the smoke collection chamber 2a has a first smoke collection area and a second smoke collection area in the left-right direction, and the air curtain component 3 is installed corresponding to the first smoke collection area. That is to say, the second smoke collection area of ​​the smoke collection chamber 2a is not equipped with the air curtain component 3.

[0080] In this case, the control method of the range hood specifically includes: Detect and compare the oil fume index of the first and second smoke collection areas; 1. If the oil fume index of the second smoke collection zone is greater than that of the first smoke collection zone, the nozzle 32 is controlled to blow air to form an air curtain that is tilted at a first preset angle relative to the horizontal direction, so as to block at least part of the first smoke collection zone.

[0081] 2. If the oil fume index of the second smoke collection zone is less than or equal to the oil fume index of the first smoke collection zone, then the control nozzle 32 will not blow air, or blow air to form an air curtain that is tilted at a second preset angle relative to the horizontal direction to guide the oil fume.

[0082] Wherein, the second preset angle is greater than the first preset angle, and the first preset angle is greater than or equal to 0°.

[0083] Understandably, when the oil fume index in the second smoke collection zone is high, it is necessary to enhance the smoke extraction effect in the second smoke collection zone. Therefore, the control nozzle 32 forms an air curtain in the first smoke collection zone, thereby enhancing the smoke extraction effect in the second smoke collection zone and weakening the smoke extraction effect in the first smoke collection zone.

[0084] It should be noted that, under these circumstances, when the oil fume index of the first smoke collection zone is 0, or less than the set index, the oil fume in the first smoke collection zone can be considered negligible, and the air curtain can be set to extend horizontally. However, when the oil fume index of the first smoke collection zone is greater than the set index, it can be considered that although the oil fume in the first smoke collection zone is less, it still requires the range hood to extract the smoke. In this case, the air curtain is set to tilt upwards at an angle greater than 0° relative to the horizontal direction. The first preset angle is a range value, and it is adjusted according to the amount of oil fume in the first smoke collection zone within this range. For example, the higher the oil fume index of the first smoke collection zone, the greater the tilt angle of the air curtain.

[0085] When the oil fume index of the second smoke collection zone is low, it is necessary to enhance the smoke extraction effect of the first smoke collection zone. Therefore, the air nozzle 32 is controlled to blow air to form an air curtain that is tilted at a second preset angle relative to the horizontal direction, so as to guide the oil fume and strengthen the weak area on the side of the smoke collection chamber 2a. At this time, the ability of the air curtain to enhance the smoke extraction effect is greater than the smoke blocking effect. In this way, the smoke extraction effect of the first smoke collection zone can be enhanced, but the smoke extraction effect of the second smoke collection zone is not affected.

[0086] It should be noted that, under these circumstances, the optimal value for the second set angle can be obtained through experiments, and it is related to the structure of the range hood, so no specific limitation is made here.

[0087] For example, refer to Figure 4 and Figure 5 The smoke hood 2 includes two inner side plates 21 spaced apart on the left and right, forming a smoke collection chamber 2a between the two inner side plates 21. Each inner side plate 21 includes a guide plate 211 tilted at a predetermined angle relative to the horizontal direction. The nozzle 32 is located below the guide plate 211, and the second preset included angle is equal to the predetermined angle.

[0088] Understandably, the air guide plate 211 serves to guide the fumes, creating a weak zone at the air guide plate 211. Furthermore, the air guide plate 211 limits the tilt angle of the air curtain to no greater than a set angle. Thus, by selecting the second preset angle as the set angle, the presence of the air curtain strengthens the weak flow field on the side of the smoke collection chamber 2a, thereby enhancing the smoke extraction effect on that side.

[0089] It should be noted that the second preset angle can be slightly smaller than the set angle, such as N times the set angle. N can be selected as 0.95, 0.9, 0.85, 0.8, etc. There are no specific restrictions here. It can be selected through actual experiments to ensure the strengthening effect on the weak area without weakening the smoking effect on the other side.

[0090] This application also provides a control method for a range hood, applicable to the range hood described in the above embodiments.

[0091] Taking an example where two air curtain components 3 are provided. In this case, the smoke collection chamber 2a has a left smoke collection area and a right smoke collection area in the left-right direction, and the two air curtain components 3 are respectively set for the left smoke collection area and the right smoke collection area. It should be noted that the blowing angle and blowing speed of the above-mentioned nozzles 32 can be determined by the magnitude and difference of the oil fume index on both sides, etc. Multiple factors can be considered comprehensively, or only one factor can be considered. No specific restrictions are made here.

[0092] For example, in one specific implementation, the control method for the range hood specifically includes: Detect and compare the oil fume index of the left and right smoke collection zones; 11. If the difference in the fume index between the two sides is greater than a first set value, the nozzle 32 on the side with the lower fume index is controlled to blow air to form a horizontally extending or relatively horizontally inclined air curtain at a first preset angle, so as to at least partially block the airflow on that side. The nozzle 32 on the side with the higher fume index is controlled not to blow air, or the nozzle 32 is controlled to blow air to form an air curtain relatively horizontally inclined at a second preset angle, so as to guide the fumes. The second preset angle is greater than the first preset angle, and the first preset angle is greater than or equal to 0°.

[0093] If the difference in the fume index between the two sides is large, it can be considered that the side with the larger fume index needs to be strengthened, while the side with the smaller fume index needs to be appropriately weakened. In this way, on the side with the larger fume index, the air curtain forms a smoke-guiding air curtain to compensate for the weak area and enhance the smoke-smoking effect. On the side with the smaller fume index, the air curtain forms a smoke-blocking air curtain. The horizontal component of the smoke-blocking air curtain blocks the external air on that side to a certain extent, while the vertical component can supplement the main airflow generated by the main fan, further enhancing the smoke-smoking effect on the side with the larger fume index.

[0094] It should be noted that the first preset angle of the smoke curtain is a range value and can be adjusted within a certain range. For example, if the smoke index on one side is 0, or the smoke index is less than the set index, the smoke on that side can be considered negligible, and the air curtain can be set to extend horizontally. However, when the smoke index is greater than the set value, it can be considered that although there is less smoke in the smoke collection area, the range hood still needs to remove it, and the air curtain is set to tilt upwards at a certain angle relative to the horizontal direction.

[0095] 12. If the difference in the oil fume index between the two sides is less than or equal to the first set value, then control each nozzle 32 to stop blowing air, or control each nozzle 32 to blow air to form an air curtain that is tilted at a second preset angle relative to the horizontal direction, so as to guide the oil fume.

[0096] If the difference in the fume index between the two sides is small, it can be considered that the fume indexes on both sides are "the same". In this case, the nozzle 32 can be controlled to stop blowing air, and the main fan can be used to smoke the two smoke collection areas. Alternatively, the nozzle 32 can be controlled to blow air to form an air curtain with a second preset angle. In this case, the smoke guiding effect of the air curtain can be used to compensate for the weak areas of the two smoke collection areas and enhance the smoke extraction effect of the two smoke collection areas.

[0097] It should be noted that in this case, the wind speed of the nozzle 32 can also be adjusted. For example, if the difference in the oil fume index on both sides is small, but the oil fume index is greater than the first set oil fume index, then the oil fume is considered to be large, and the wind speed of the nozzle 32 can be set to the maximum wind speed. When the oil fume index is less than the second set oil fume index, then the oil fume is considered to be small, and the wind speed of the nozzle 32 can be appropriately reduced, for example, to L1 times the maximum wind speed, where 0 < L1 < 1. For example, L1 can be selected as 0.1, 0.2, 0.3, etc., meaning L1 is set according to actual needs. When the oil fume index is between the first and second set oil fume indices, then the oil fume is considered to be moderate, and the wind speed of the nozzle 32 can be appropriately reduced, for example, to L2 times the maximum wind speed, where 0 < L2 < 1. L2 can be selected as 0.9, 0.8, 0.7, etc., meaning M is set according to actual needs.

[0098] Specifically, if the difference in the oil fume index between the two sides is less than or equal to the first set value, further judgment can be made: If the oil fume index on both sides is greater than the first set oil fume index, then control each nozzle 32 to stop blowing air, or control each nozzle 32 to blow air at the maximum wind speed to form an air curtain that is tilted at a second preset angle relative to the horizontal direction in order to guide the oil fume.

[0099] If the oil fume index on one side is greater than the first set oil fume index, the nozzle 32 on the side with the larger oil fume index is controlled to blow air at the maximum wind speed to form an air curtain tilted at a second preset angle relative to the horizontal direction, and the nozzle 32 on the side with the smaller oil fume index is controlled to blow air at the first set wind speed to form an air curtain tilted at a second preset angle relative to the horizontal direction. The first set wind speed is less than or equal to the maximum wind speed. If the oil fume index on both sides is less than the first set oil fume index, then control each nozzle 32 to not blow air, or control each nozzle 32 to blow air at the second set wind speed to form an air curtain that is tilted at the second preset angle relative to the horizontal direction. The second set wind speed is less than or equal to the maximum wind speed. If the oil fume index on both sides is less than the second set oil fume index, then control each nozzle 32 to not blow air, or control each nozzle 32 to blow air at the third set wind speed to form an air curtain that is tilted at the second preset angle relative to the horizontal direction, and the third set wind speed is less than the maximum wind speed. The first set oil fume index is greater than the second set oil fume index, and the first set oil fume index and the second set oil fume index can be set according to actual needs.

[0100] For example, in another specific implementation, the control method for the range hood specifically includes: Detect the oil fume index in the left and right smoke collection zones; 111. If the oil fume index on both sides is greater than or equal to the first set oil fume index, then control each nozzle 32 to stop blowing air, or control each nozzle 32 to blow air at the maximum wind speed to form an air curtain that is tilted at a second preset angle relative to the horizontal direction in order to guide the oil fume. 112. If the oil fume index on both sides is less than or equal to the first set oil fume index, then control each nozzle 32 to not blow air, or control each nozzle 32 to blow air at the maximum wind speed of N1 times to form an air curtain tilted at the second preset angle relative to the horizontal direction to guide the oil fume, 0 < N1 ≤ 1.

[0101] 113. If the oil fume index on one side is greater than the first set oil fume index, while the oil fume index on the other side is less than the first set oil fume index, the nozzle 32 on the side with the higher oil fume index is controlled to blow air at its maximum speed to form an air curtain tilted at a second preset angle relative to the horizontal direction, in order to guide the oil fumes. On the side with the lower oil fume index, the nozzle 32 is controlled to blow air at its maximum speed of N2 times according to the difference between the two oil fume indices to form an air curtain tilted at a first preset angle or a second preset angle relative to the horizontal direction, where 0 < N2 ≤ 1.

[0102] 114. If the oil fume indices on both sides are between the first and second preset oil fume indices, the nozzle 32 on the side with the higher oil fume index will blow air at a maximum speed of N3 times to form an air curtain tilted at a second preset angle relative to the horizontal direction to guide the oil fumes; the nozzle 32 on the side with the lower oil fume index will blow air at a maximum speed of N4 times to form an air curtain tilted at a first or second preset angle relative to the horizontal direction. 0 < N3 ≤ 1, 0 < N4 ≤ 1.

[0103] When the difference in the oil fume index between the two sides is greater than a first set value, the nozzle 32 with the lower oil fume index is controlled to blow air at a maximum wind speed of N4 times to form an air curtain tilted at a first preset angle relative to the horizontal direction. When the difference in the oil fume index between the two sides is less than or equal to the first set value, the nozzle 32 with the lower oil fume index is controlled to blow air at a maximum wind speed of N4 times to form an air curtain tilted at a second preset angle relative to the horizontal direction.

[0104] 115. If the oil fume index on one side is less than or equal to the second preset index, and the oil fume index on the other side is greater than the second preset index but less than the first preset index, then the nozzle 32 on the side with the higher oil fume index will blow air at a maximum wind speed of N5 times to form an air curtain tilted at a second preset angle relative to the horizontal direction to guide the oil fumes; the nozzle 32 on the side with the lower oil fume index will blow air at a maximum wind speed of N6 times to form an air curtain tilted at a first preset angle or a second preset angle relative to the horizontal direction. 0 < N5 ≤ 1, 0 < N6 ≤ 1.

[0105] When the difference in the oil fume index between the two sides is greater than a first set value, the nozzle 32 with the lower oil fume index is controlled to blow air at a maximum wind speed of N6 times to form an air curtain tilted at a first preset angle relative to the horizontal direction. When the difference in the oil fume index between the two sides is less than or equal to the first set value, the nozzle 32 with the lower oil fume index is controlled to blow air at a maximum wind speed of N6 times to form an air curtain tilted at a second preset angle relative to the horizontal direction.

[0106] The first preset included angle is greater than or equal to 0° and less than the second preset included angle.

[0107] For example, refer to Figure 4 and Figure 5 The smoke hood 2 includes two inner side plates 21 spaced apart on the left and right, forming a smoke collection chamber 2a between the two inner side plates 21. Each inner side plate 21 includes a guide plate 211 tilted at a predetermined angle relative to the horizontal direction. The nozzle 32 is located below the guide plate 211, and the second preset included angle is equal to the predetermined angle.

[0108] Understandably, the air guide plate 211 serves to guide the fumes, creating a weak zone at the air guide plate 211. Furthermore, the air guide plate 211 limits the tilt angle of the air curtain to no greater than the set angle. Thus, when the second preset angle is selected as the set angle, the presence of the air curtain strengthens the weak zone, thereby enhancing the smoke extraction effect on that side.

[0109] It should be noted that the second preset angle can be slightly smaller than the set angle, such as N times the set angle. N can be selected as 0.95, 0.9, etc. There is no specific limitation here. It can be selected through actual experiments to ensure the strengthening effect on the weak area without weakening the smoking effect on the other side.

[0110] For example, taking an air curtain assembly 3 with two components and an air nozzle 32 with an oscillation angle of 0°-60° as an example, an example of air curtain adjustment is given considering the difference and size of the oil fume index on both sides.

[0111] When the difference in the oil fume index between the left and right smoke collection zones is less than or equal to the first preset value, and both are greater than the first preset oil fume index, the left air nozzle 32 blows air at its maximum speed to form a smoke-guiding air curtain tilted at 60°, and the right air nozzle 32 blows air at its maximum speed to form a smoke-guiding air curtain tilted at 60°. At this time, the second preset included angle is 60°.

[0112] When the difference in the oil fume index between the left and right smoke collection zones is less than or equal to the first preset value, and both are less than the second preset oil fume index, the left air nozzle 32 blows air at 20% of its maximum speed to form a smoke-guiding air curtain tilted at 60°, and the right air nozzle 32 blows air at 20% of its maximum speed to form a smoke-guiding air curtain tilted at 60°. At this time, the second preset included angle is 60°.

[0113] When the difference in the oil fume index between the left and right smoke collection zones exceeds a first set value, and the oil fume index of the left smoke collection zone is larger, if the oil fume index of the right smoke collection zone is greater than the set index, the left air nozzle 32 blows at maximum speed to form a smoke-guiding air curtain tilted at 60°, and the right air nozzle 32 blows at maximum speed to form a smoke-blocking air curtain tilted at 30°. If the oil fume index of the right smoke collection zone is less than or equal to the set index, the left air nozzle 32 blows at maximum speed to form a smoke-guiding air curtain tilted at 60°, and the right air nozzle 32 blows at maximum speed to form a smoke-blocking air curtain tilted at 5°.

[0114] When the difference in the oil fume index between the left and right smoke collection zones exceeds a first set value, and the oil fume index of the right smoke collection zone is larger, if the oil fume index of the left smoke collection zone is greater than the set index, the left air nozzle 32 blows at maximum speed to form a smoke-guiding air curtain tilted at 30°, and the right air nozzle 32 blows at maximum speed to form a smoke-blocking air curtain tilted at 60°. If the oil fume index of the left smoke collection zone is less than or equal to the set index, the left air nozzle 32 blows at maximum speed to form a smoke-guiding air curtain tilted at 5°, and the right air nozzle 32 blows at maximum speed to form a smoke-blocking air curtain tilted at 60°.

[0115] It should be noted that the above-mentioned air curtain adjustment can be further divided into multiple gradients for the fume index, air curtain velocity, and air curtain angle, allowing for fine-tuning based on the size and difference of the fumes on both sides. For example, when the difference in fume indices on both sides is small, the air curtain angle is not adjusted, but the air curtain velocity is. When the difference in fume indices on both sides is large, the air curtain angle is adjusted first, and then the air curtain velocity is adjusted according to the smoke extraction effect.

[0116] Reference Figures 1 to 12 This application provides an optimal example of a range hood. The range hood includes a fan assembly 1, a smoke collection hood 2, and an air curtain assembly 3.

[0117] The fan assembly 1 includes a fan housing 11 and a main fan disposed in the fan cavity of the fan housing 11.

[0118] The smoke hood 2 includes two inner side plates 21 spaced apart on the left and right, forming a smoke collection chamber 2a between the two inner side plates 21. The inner side plates 21 are provided with clearance holes for the air supply nozzle 32 to swing.

[0119] The inner panel 21 includes an air guide plate 211 tilted at a preset angle relative to the horizontal direction. In the left-right direction of the smoke hood 2, the upper end of the air guide plate 211 is closer to the other inner panel 21 than the lower end. The air nozzle 32 is located below the air guide plate 211. The maximum angle at which the air curtain is tilted relative to the horizontal direction is a preset angle.

[0120] The smoke hood 2 also includes two outer side plates 22 spaced apart on the left and right, and an inner side plate 21 located between the two outer side plates 22. The inner side plate 21 and the outer side plates 22 together form an installation cavity 2b.

[0121] The air curtain assembly 3 includes an air supply structure 31 and an air nozzle 32 that can swing up and down. The air supply structure 31 is disposed in the mounting cavity 2b, and the air nozzle 32 extends into the smoke collection cavity 2a. The air nozzle 32 is configured to blow air to form an air curtain that extends horizontally or tilts upward relative to the horizontal direction.

[0122] There are two air curtain components 3, with two air nozzles 32 located on the left and right sides of the smoke collection chamber 2a, respectively.

[0123] The air supply structure 31 includes an inner cylinder 313 with an air chamber that can rotate around its own axis. An air nozzle 32 is connected to the inner cylinder 313, which is fitted against the inner side plate 21 and always covers the clearance hole. The air supply structure 31 also includes a drive component 312, an outer cylinder 314, an air inlet pipe 311, and a secondary fan 315. The drive component 312 drives the inner cylinder 313 to rotate. The air outlet of the air inlet pipe 311 connects to the inner cavity of the outer cylinder 314. The inner cylinder 313 is rotatably disposed within the outer cylinder 314, and the air chamber of the inner cylinder 313 is always connected to the inner cavity of the outer cylinder 314. This allows airflow to be delivered to the air nozzle 32 via the air inlet pipe 311, the outer cylinder 314, and the inner cylinder 313 during the rotation of the inner cylinder 313, enabling the air nozzle 32 to oscillate. The secondary fan 315 is disposed within the air inlet pipe 311 to draw air and deliver it to the air nozzle 32.

[0124] By adjusting the air curtain's tilt angle, a first preset angle can be used to partially obstruct one half of the smoke collection chamber 2a, concentrating the main airflow generated by the main fan on the other half. This achieves unilateral smoke extraction for the range hood and improves its smoke extraction effect. Furthermore, the tilted air guide plate 211 creates weak flow zones on both sides of the smoke collection chamber 2a. When the air curtain is tilted to the preset angle, it strengthens these weak flow zones, thus improving the smoke extraction effect on the side where the air curtain is installed. The air curtain's flow rate can also be adjusted.

[0125] The preset angle is 60°. In this setting, the first preset angle is greater than or equal to 0° and less than the second preset angle, while the second preset angle is less than or equal to 60°. Furthermore, the first and second preset angles can be specific values ​​or ranges, allowing adjustment within a certain range. For example, the first preset angle is preferably greater than or equal to 0° and less than or equal to 30°, meaning that when the air curtain effectively blocks smoke, it can be adjusted within the range of 0°-30°. The second preset angle is preferably equal to 60°, in which case the air curtain primarily enhances the smoke-blocking effect.

[0126] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0127] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A range hood, characterized in that, include: A fan assembly includes a fan housing and a main fan disposed within a fan cavity of the fan housing; A smoke hood is connected to the fan housing and has a smoke collection chamber, which has a smoke inlet and a smoke outlet communicating with the fan chamber. An air curtain assembly includes an air supply structure and an air nozzle that can swing up and down. The air supply structure is mounted on the smoke collection hood, and the air nozzle extends into the smoke collection chamber and is configured to blow air to form an air curtain that extends horizontally or tilts upward relative to the horizontal direction. The air curtain assembly is provided on at least one side of the smoke collection chamber in the left-right direction.

2. The range hood according to claim 1, characterized in that, In the left-right direction of the smoke hood, the length of the air curtain is less than or equal to half the length of the smoke collection chamber at the location where the air nozzle is set.

3. The range hood according to claim 1, characterized in that, The smoke collection hood includes two inner side plates spaced apart on the left and right, and the two inner side plates form the smoke collection chamber. The inner side plates are provided with clearance holes for the air nozzle to swing. The inner panel includes an air guide plate that is inclined at a preset angle relative to the horizontal direction. In the left-right direction of the smoke hood, the upper end of the air guide plate is closer to another inner panel than the lower end, and the air nozzle is located on the lower side of the air guide plate. The maximum angle at which the air curtain tilts relative to the horizontal direction is the preset angle.

4. The range hood according to claim 3, characterized in that, The smoke collection hood also includes two outer side panels spaced apart on the left and right, and an inner side panel is located between the two outer side panels, forming an installation cavity between the inner side panel and the outer side panels; The air supply structure is disposed in the mounting cavity.

5. The range hood according to claim 3, characterized in that, The air supply structure also includes an inner cylinder with an air cavity that can rotate around its own axis. The air nozzle is connected to the inner cylinder, and the inner cylinder is attached to the inner side plate and always covers the clearance hole.

6. The range hood according to claim 1, characterized in that, The air outlet of the nozzle is configured as a flat opening, and the length direction of the air outlet is perpendicular to the left and right direction of the smoke collection hood. And / or, the range hood further includes an oil fume detection component, which is disposed on the smoke collection hood or the fan housing, and is used to detect the oil fume index on the left and right sides of the smoke collection chamber.

7. A control method for a range hood, characterized in that, Applicable to the range hood as described in any one of claims 1-6, wherein the smoke collection chamber has a first smoke collection area and a second smoke collection area in the left-right direction, and the air curtain assembly is provided and is arranged corresponding to the first smoke collection area; The control method for the range hood includes: Detect and compare the oil fume index of the first smoke collection area and the second smoke collection area; If the oil fume index of the second smoke collection area is greater than that of the first smoke collection area, the nozzle is controlled to blow air to form an air curtain that is tilted at a first preset angle relative to the horizontal direction, so as to block at least part of the first smoke collection area. If the oil fume index of the second smoke collection zone is less than or equal to the oil fume index of the first smoke collection zone, then the nozzle is controlled to not blow air, or blow air to form an air curtain that is tilted at a second preset angle relative to the horizontal direction in order to guide the oil fume. The second preset angle is greater than the first preset angle, and the first preset angle is greater than or equal to 0°.

8. A control method for a range hood, characterized in that, Applicable to the range hood as described in any one of claims 1-6, wherein the smoke collection chamber has a left smoke collection area and a right smoke collection area in the left-right direction, and the air curtain assembly is provided in two, respectively corresponding to the left smoke collection area and the right smoke collection area; The control method for the range hood includes: Detect and compare the oil fume index of the left smoke collection area and the right smoke collection area; If the difference in the oil fume index between the two sides is greater than the first set value, the nozzle on the side with the smaller oil fume index is controlled to blow air to form an air curtain that is tilted at a first preset angle relative to the horizontal direction, so as to block at least part of that side; the nozzle on the side with the larger oil fume index is controlled not to blow air, or the nozzle is controlled to blow air to form an air curtain that is tilted at a second preset angle relative to the horizontal direction, so as to guide the oil fume. If the difference in the oil fume index between the two sides is less than or equal to the first set value, then control each nozzle to not blow air, or control each nozzle to blow air to form an air curtain that is tilted at a second preset angle relative to the horizontal direction in order to guide the oil fumes. The second preset angle is greater than the first preset angle, and the first preset angle is greater than or equal to 0°.

9. The control method for a range hood according to claim 8, characterized in that, The smoke hood includes two inner side plates spaced apart on the left and right, forming the smoke collection chamber between the two inner side plates. The inner side plates include air guide plates that are tilted at a set angle relative to the horizontal direction. The nozzle is located on the lower side of the air guide plate, and the second preset included angle is equal to the set angle.

10. A control method for a range hood, characterized in that, Applicable to the range hood as described in any one of claims 1-6, wherein the smoke collection chamber has a left smoke collection area and a right smoke collection area in the left-right direction, and the air curtain assembly is provided in two, respectively corresponding to the left smoke collection area and the right smoke collection area; The control method for the range hood includes: Detect the oil fume index of the left smoke collection area and the right smoke collection area; If the oil fume index on both sides is greater than or equal to the first set oil fume index, then control each nozzle to not blow air, or control each nozzle to blow air at the maximum wind speed to form an air curtain that is tilted at a second preset angle relative to the horizontal direction in order to guide the oil fume. If the oil fume index on both sides is less than the first set oil fume index, then control each nozzle to not blow air, or control each nozzle to blow air at the maximum wind speed of N1 times to form an air curtain tilted at a second preset angle relative to the horizontal direction to guide the oil fume, 0 < N1 ≤ 1.

Images