Oil fume filtration devices, range hoods, and range hood control methods

Abstract

This application discloses an oil fume filtration device, a range hood, and a range hood control method, relating to the field of home appliance technology. The oil fume filtration device has at least one first rod on the inner wall of a first housing and at least one second rod on the inner wall of a second housing. At least a portion of the filter screen is in an unfolded state and located in a filtration channel for filtering airflow. The unfolded filter screen is alternately wound around the first and second rods in a zigzag pattern. An adjustment mechanism is used to adjust the relative position of the first and second housings in the airflow direction to adjust the area of ​​the unfolded filter screen. Because the first and second housings can move relative to each other to adjust the area of ​​the unfolded filter screen, the filtration area can be adjusted according to the actual needs of different scenarios, better balancing the filtration effect and wind resistance, thereby improving the user experience.

Description

Technical Field

[0001] This application relates to the field of home appliance technology, and more specifically, to an oil fume filtration device, a range hood, and a range hood control method. Background Technology

[0002] Existing range hoods use purification filters to filter cooking fumes, thereby improving the cleanliness of the air exhausted from the hood. With the same duct size, a larger filter area results in better filtration; however, a larger filter area also increases airflow resistance, which reduces the range hood's fume extraction capacity, potentially leading to incomplete fume removal and a poor user experience. Furthermore, the filters in current range hood technology typically have a fixed purification area, making it impossible to adjust according to the specific scenario. This hinders the effective balance between airflow resistance and filtration capacity across different usage scenarios, ultimately failing to meet diverse user needs and resulting in a subpar user experience. Summary of the Invention

[0003] The purpose of this application is to provide an oil fume filtration device, a range hood, and a range hood control method. The oil fume filtration device can flexibly adjust the area of ​​the filter screen to meet the usage needs in different scenarios and improve the user experience.

[0004] The embodiments of this application can be implemented as follows:

[0005] In a first aspect, this application provides an oil fume filtration device, including a first housing, a second housing, a filter screen, and an adjustment mechanism. The first housing and the second housing are arranged and connected in the airflow direction, and the first housing and the second housing together form a filtration channel. The first housing is provided with an air inlet communicating with the filtration channel, and the second housing is provided with an exhaust port communicating with the filtration channel. At least one first rod is provided on the inner wall of the first housing, and at least one second rod is provided on the inner wall of the second housing. At least a portion of the filter screen is in an unfolded state and located in the filtration channel for filtering airflow. The unfolded filter screen is alternately wound around the first rod and the second rod in a zigzag pattern. The adjustment mechanism is used to adjust the relative position of the first housing and the second housing in the airflow direction to adjust the area of ​​the unfolded filter screen.

[0006] In an optional embodiment, the adjustment mechanism includes a movable adjustment component and a retractable component. One end of the filter screen is fixed relative to one of the first housing and the second housing, and the other end is connected to the retractable component. The movable adjustment component is used to adjust the relative position of the first housing and the second housing in the airflow direction. A portion of the filter screen can be stored in the retractable component and is in a stored state. The retractable component is used to release the filter screen in the stored state or retract the filter screen in the unfolded state.

[0007] In an optional embodiment, the winding and unwinding assembly includes a coil spring to which the filter screen is connected. The coil spring is used to wind and unwind the filter screen and has a winding tendency to keep the filter screen taut when it is in the unfolded state.

[0008] In an optional embodiment, the retraction assembly further includes a storage housing disposed on the outside of the first housing or the second housing, a coil spring disposed inside the storage housing, and a filter screen passing through a storage opening on the first housing or the second housing.

[0009] In an optional embodiment, the moving adjustment assembly includes a push rod motor for driving the first housing and the second housing to move closer to or further away from each other in the airflow direction.

[0010] In an optional embodiment, the moving adjustment assembly further includes a transmission component, the push rod motor includes a fixed part and a push rod, the fixed part of the push rod motor is connected to one of the first housing and the second housing, the transmission component is connected to the other of the first housing and the second housing through two connection points, the push rod of the push rod motor is connected to the transmission component, and the two connection points of the transmission component are located on opposite sides of the filter channel.

[0011] In an optional embodiment, the end of the first housing opposite to the air inlet and the end of the second housing opposite to the exhaust port are connected together.

[0012] Secondly, this application provides a range hood, including a fan and an oil fume filtration device according to any of the foregoing embodiments, wherein the fan is connected to the oil fume filtration device.

[0013] In an optional embodiment, the range hood further includes a first oil fume concentration sensor, which is used to detect the oil fume concentration upstream of the oil fume filter device.

[0014] In an optional embodiment, the range hood further includes a second oil fume concentration sensor, which is used to detect the oil fume concentration downstream of the oil fume filter device.

[0015] In an optional embodiment, the range hood further includes an exhaust duct, the exhaust port of the fume filter is connected to the exhaust duct through a flexible pipe, the end of the exhaust duct away from the fume filter forms the outlet of the range hood, and a second fume concentration sensor is installed in the exhaust duct.

[0016] Thirdly, this application provides a range hood control method, applied to the range hood in any of the foregoing embodiments, the range hood control method comprising:

[0017] Obtain the oil fume concentration at the target detection location;

[0018] Based on the oil fume concentration at the target detection location, the control and adjustment mechanism adjusts the area of ​​the filter screen in the unfolded state.

[0019] In an optional implementation, the target detection location includes a first detection location upstream of the fume filter; the step of controlling the adjustment mechanism to adjust the area of ​​the filter screen in the deployed state according to the fume concentration at the target detection location includes:

[0020] Determine whether the oil fume concentration at the first detection location is greater than the preset concentration value;

[0021] If the oil fume concentration at the first detection position is greater than the preset concentration value, the control adjustment mechanism reduces the area of ​​the filter screen in the unfolded state.

[0022] In an optional embodiment, the target detection location further includes a second detection location downstream of the fume filter; the step of controlling the adjustment mechanism to adjust the area of ​​the filter screen in the unfolded state according to the fume concentration at the target detection location further includes:

[0023] If the oil fume concentration at the first detection position is not greater than the preset concentration value, the filtration efficiency is determined based on the oil fume concentration at the first and second detection positions to determine whether the preset efficiency has been achieved.

[0024] If the filtration efficiency does not reach the preset efficiency, the control adjustment mechanism increases the area of ​​the filter screen in the unfolded state.

[0025] In an optional implementation, the step of controlling the adjustment mechanism to adjust the area of ​​the filter screen in the unfolded state according to the oil fume concentration at the target detection location further includes:

[0026] If the filtration efficiency reaches the preset efficiency, determine whether the pressure difference between the upstream and downstream of the fume filter device reaches the preset difference.

[0027] When the pressure difference reaches the preset value, the control adjustment mechanism reduces the area of ​​the filter screen in the unfolded state.

[0028] The beneficial effects of the fume filtration device, range hood, and range hood control method provided in this application include:

[0029] The fume filtration device provided in this application includes a first housing, a second housing, a filter screen, and an adjustment mechanism. The first and second housings are arranged and connected in the airflow direction, forming a filtration channel. The first housing has an air inlet for the filtration channel, and the second housing has an air outlet for the filtration channel. At least one first rod is provided on the inner wall of the first housing, and at least one second rod is provided on the inner wall of the second housing. At least a portion of the filter screen is in an unfolded state and located in the filtration channel for filtering airflow. The unfolded filter screen is alternately wound around the first and second rods in a zigzag pattern. The adjustment mechanism is used to adjust the relative position of the first and second housings in the airflow direction to adjust the area of ​​the unfolded filter screen. In this embodiment, since the first and second housings can move relative to each other to adjust the area of ​​the unfolded filter screen, the filtration area can be adjusted according to the actual needs of different scenarios, better balancing the filtration effect and air resistance, thereby improving the user experience.

[0030] The range hood provided in this application includes the above-mentioned fume filtration device, and therefore has the advantages of high flexibility and strong applicability to different scenarios.

[0031] The range hood control method provided in this application embodiment is applied to the above-mentioned range hood, and can adjust the area of ​​the unfolded filter according to the concentration of oil fumes, thereby better meeting the usage needs under different oil fume concentrations and improving the user experience. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a range hood in one embodiment of this application;

[0034] Figure 2 This is a schematic diagram of the air inlet side of the fume filter device in one embodiment of this application;

[0035] Figure 3 This is a schematic diagram of one side of the exhaust port of the fume filtration device in one embodiment of this application;

[0036] Figure 4 This is an exploded view of an oil fume filtration device in one embodiment of this application;

[0037] Figure 5 and Figure 6This is a cross-sectional view of an oil fume filtration device in one embodiment of the present application when the first housing and the second housing are in different relative positions.

[0038] Figure 7 This is a flowchart of a range hood control method in one embodiment of this application;

[0039] Figure 8 This is a flowchart of step S200 of the range hood control method in one embodiment of this application;

[0040] Figure 9 This is a flowchart of a range hood control method in a specific embodiment of this application.

[0041] Icons: 001-Cookware; 100-Countertop; 110-Stove; 120-Smoke Inlet; 121-Smoke Inlet Grille; 200-Cabinet; 210-Oil Filter; 220-Oil Cup; 230-Guide Section; 240-Fan; 241-Exhaust Pipe; 242-First Detection Component; 251-Diffuser; 252-Contraction Shield; 260-Exhaust Duct; 261-Flexible Pipe; 262-Second Detection Component; 270-Outlet; 271- 280 - Exit grille; 300 - Control assembly; 310 - Fume filter; 311 - First housing; 312 - Storage port; 313 - Air inlet; 320 - Second housing; 321 - Second rod; 322 - Exhaust port; 330 - Filter screen; 340 - Retraction assembly; 341 - Storage housing; 342 - Mounting shaft; 343 - Coil spring; 350 - Movement adjustment assembly; 351 - Push rod motor; 352 - Transmission component. Detailed Implementation

[0042] In related technologies, the filter area of ​​the range hood's mesh is fixed, making it difficult to meet diverse usage needs in different scenarios. For example, during cooking, when the amount of oil fumes is large and seriously affects the user experience, the primary task of the range hood is to improve fume extraction, while the filtration efficiency of the fume filter should be secondary. However, the fixed area of ​​the filter in related technologies, designed to ensure filtration effectiveness, leads to greater air resistance when increased airflow is needed, hindering improved fume extraction. Conversely, when the range hood's airflow is sufficient for fume extraction, a better filtration capacity is required to improve purification; however, existing range hoods do not allow for filter adjustment.

[0043] Therefore, embodiments of this application provide an oil fume filtration device and a range hood, wherein the filtration area of ​​the filter screen is adjustable, thereby meeting the usage needs of different scenarios. In addition, embodiments of this application also provide a range hood control method that automatically adjusts the filtration area of ​​the filter screen based on the oil fume concentration, thereby improving the user experience.

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0047] In the description of this application, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0048] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0049] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0050] Figure 1 This is a schematic diagram of a range hood in one embodiment of this application. Figure 1As shown in the illustration, the range hood provided in this embodiment is an island-style integrated range hood. The range hood includes a countertop 100, a cabinet 200 disposed beneath the countertop 100, a fan 240, and an oil fume filter 300. Both the fan 240 and the oil fume filter 300 are housed within the cabinet 200. The range hood has an inlet 120 and an outlet 270. In this embodiment, the inlet 120 is located on the countertop 100. Along the airflow direction, the inlet 120, fan 240, oil fume filter 300, and outlet 270 are sequentially connected to form the range hood's duct. A cooktop 110 is mounted on the countertop 100, allowing the user to place cookware 001 on it for heating. The fan 240 provides the power for airflow. In this embodiment, along the airflow direction, the fan 240 is located upstream of the oil fume filter 300. In other embodiments, the fan 240 may be located downstream of the oil fume filter 300.

[0051] This embodiment describes the range hood as an island-style integrated unit. It should be understood that in other optional embodiments, the range hood can be of other types, such as a top-mounted range hood. The various components of the range hood are described below along the airflow direction.

[0052] In this embodiment, an inlet grille 121 is provided at the smoke inlet 120 of the range hood to block objects on the table 100 and prevent them from falling into the air duct. An oil mesh 210 is provided below the smoke inlet grille 121. The oil mesh 210 can trap some oil fume particles in the airflow, providing a certain filtering effect. An oil cup 220 is provided below the oil mesh 210 to catch and temporarily store oil droplets falling from the oil mesh 210. The oil cup 220 is detachable for easy disassembly and cleaning by the user. A guide section 230 is provided inside the cabinet 200, forming part of the sidewall of the air duct. The guide section 230 is used to guide the airflow after passing through the oil mesh 210 to the air inlet side of the fan 240.

[0053] In this embodiment, the fan 240 is a centrifugal fan, which features axial air intake and radial air outlet. In other optional embodiments, the fan 240 may also be of other types, such as an axial flow fan or a cross-flow fan.

[0054] The exhaust side of the fan 240 is connected to the air inlet 313 of the fume filter 300. In this embodiment, the exhaust side of the fan 240 has an exhaust pipe 241, one end of which is connected to the volute of the fan 240, and the other end is connected to the air inlet 313 of the fume filter 300. Since the diameter of the exhaust pipe 241 is smaller than the diameter of the air inlet 313 of the fume filter 300, the exhaust pipe 241 is connected to the air inlet 313 of the fume filter 300 through a diffuser 251. In this embodiment, a first detection component 242 is also provided on the exhaust pipe 241 of the fan 240, which can detect the state of the airflow. Optionally, the first detection component 242 may include a first fume concentration sensor for detecting the fume concentration upstream of the fume filter 300, and a first flow velocity sensor for detecting the airflow velocity.

[0055] Figure 2 This is a schematic diagram of one side of the air inlet 313 of the oil fume filter device 300 in one embodiment of this application; Figure 3 This is a schematic diagram of one side of the exhaust port 322 of the oil fume filter device 300 in one embodiment of this application; Figure 4 This is an exploded view of an oil fume filtration device 300 in one embodiment of this application. Figures 2 to 4 As shown, the fume filtration device 300 of this application embodiment includes a first housing 310, a second housing 320, a filter screen 330, and an adjustment mechanism. The first housing 310 and the second housing 320 are arranged and connected in the airflow direction, and together they form a filtration channel. The first housing 310 is provided with an air inlet 313 communicating with the filtration channel, and the second housing 320 is provided with an exhaust port 322 communicating with the filtration channel. The air inlet 313 and the exhaust port 322 are located at opposite ends of the fume filtration device 300. The inner wall of the first housing 310 is provided with at least one first rod 311, and the inner wall of the second housing 320 is provided with at least one second rod 321. At least a portion of the filter screen 330 is in an unfolded state and located in the filter channel for filtering airflow. The unfolded filter screen 330 is alternately wound around the first rod 311 and the second rod 321 in a zigzag pattern. The adjustment mechanism is used to adjust the relative position of the first housing 310 and the second housing 320 in the airflow delivery direction to adjust the area of ​​the unfolded filter screen 330.

[0056] In this embodiment, the filter screen 330 is woven from a high-temperature resistant flexible material, such as carbon fiber felt. The first rod 311 and the second rod 321 can be cylindrical or prismatic.

[0057] Figure 5 and Figure 6This is a cross-sectional view of the oil fume filter device 300 in one embodiment of this application when the first housing 310 and the second housing 320 are in different relative positions. (In conjunction with...) Figures 2 to 6 In this embodiment, the end of the first housing 310 opposite to the air inlet 313 and the end of the second housing 320 opposite to the exhaust port 322 are sleeved together. This allows the first housing 310 and the second housing 320 to move relative to each other in the airflow direction while ensuring good airtightness at the connection point, preventing flue gas from flowing out of the filter channel between the first housing 310 and the second housing 320. Specifically, in this embodiment, the first housing 310 is sleeved on the outside of the second housing 320. Besides using a sleeved connection, a flexible component can also be used for the connection, which also ensures relative movement between the first housing 310 and the second housing 320 and airtightness at the connection point. Figure 5 and Figure 6 In the middle, the airflow direction is from left to right.

[0058] In this embodiment, a plurality of first rods 311 are disposed within the first housing 310, and the plurality of first rods 311 are arranged in parallel at intervals and along a direction perpendicular to the airflow direction; a plurality of second rods 321 are disposed within the second housing 320, and the plurality of second rods 321 are arranged in parallel at intervals and along a direction perpendicular to the airflow direction, and the second rods 321 are parallel to the first rods 311. In this embodiment, the filter screen 330 in the unfolded state is alternately wound around the plurality of first rods 311 and the plurality of second rods 321 in a zigzag pattern. When the first housing 310 and the second housing 320 approach each other, the distance between the first rods 311 and the second rods 321 in the airflow direction decreases (e.g., ...). Figure 5 In the L1 position, the area of ​​the filter 330 in its unfolded state decreases. At this time, the filtration effect of the filter 330 weakens, and the air resistance decreases. When the first housing 310 and the second housing 320 move away from each other, the distance between the first rod 311 and the second rod 321 in the airflow direction increases (e.g., ...). Figure 6 (L2) The area of ​​filter 330 in its unfolded state increases. At this time, the filtration effect of filter 330 is enhanced, and the air resistance increases.

[0059] In this embodiment, the adjustment mechanism includes a movable adjustment component 350 and a retractable component 340. One end of the filter screen 330 is fixed relative to one of the first housing 310 and the second housing 320, and the other end is connected to the retractable component 340. The movable adjustment component 350 is used to adjust the relative position of the first housing 310 and the second housing 320 in the airflow direction. A portion of the filter screen 330 can be stored in the retractable component 340 and is in a stored state. The retractable component 340 is used to release the filter screen 330 in the stored state or retract the filter screen 330 in the unfolded state. In this embodiment, one end of the filter screen 330 is fixed relative to the first housing 310, for example, fixedly connected to the first rod 311 furthest from the retractable component 340 in a row of first rods 311 (i.e., the first rod 311 at the bottom in the figure), or fixedly connected to the inner wall of the first housing 310.

[0060] Furthermore, in this embodiment, the winding and unwinding assembly 340 is disposed on the outside of the first housing 310 or the second housing 320. The winding and unwinding assembly 340 includes a storage shell 341, a mounting shaft 342, and a coil spring 343. The storage shell 341 is disposed on the outside of the first housing 310 or the second housing 320, the mounting shaft 342 is connected to the inner wall of the storage shell 341, and the coil spring 343 is disposed inside the storage shell 341 and connected to the mounting shaft 342. The filter screen 330 is connected to the coil spring 343 and passes through the storage opening 312 on the first housing 310 or the second housing 320. The coil spring 343 is used to wind and unwind the filter screen 330, and the coil spring 343 has a winding tendency to keep the filter screen 330 taut when it is in the unfolded state. Specifically, in this embodiment, the retractable assembly 340 is disposed on the first housing 310, the storage outer shell 341 is fixedly connected to the outside of the first housing 310, and the storage opening 312 is disposed on the top of the first housing 310. The filter screen 330 can be retracted and tensioned without relying on a motor for driving by the coil spring 343.

[0061] In this embodiment, the movable adjustment assembly 350 includes a push rod motor 351, which drives the first housing 310 and the second housing 320 to move closer to or further away from each other in the airflow direction. The push rod motor 351 includes a fixed portion and a push rod. The fixed portion of the push rod motor 351 is connected to one of the first housing 310 and the second housing 320, while the push rod is drive-connected to the other of the first housing 310 and the second housing 320 to adjust the relative position of the first housing 310 and the second housing 320. Furthermore, the movable adjustment assembly 350 also includes a transmission member 352. The fixed portion of the push rod motor 351 is connected to one of the first housing 310 and the second housing 320, and the transmission member 352 is connected to the other of the first housing 310 and the second housing 320 through two connection points. The push rod of the push rod motor 351 is connected to the transmission member 352, and the two connection points of the transmission member 352 are located on opposite sides of the filter channel. By setting up a transmission component 352 and connecting it to the first housing 310 or the second housing 320 through two connection points, the push rod motor 351 can reliably apply thrust to the first housing 310 or the second housing 320, avoiding the first housing 310 or the second housing 320 from having a rotational tendency due to single-point pushing, which would ultimately lead to poor adjustment. Specifically, in this embodiment, the fixed part of the push rod motor 351 is connected to the outside of the first housing 310 and is located on the same side of the first housing 310 as the retraction assembly 340, while the transmission component 352 is connected to the second housing 320.

[0062] In this embodiment, when the push rod motor 351 extends the push rod, the second housing 320 moves away from the first housing 310, the second rod 321 moves away from the first rod 311 and pulls the filter screen 330. The pulled filter screen 330 overcomes the winding force of the coil spring 343, causing the unwinding assembly 340 to unwind. The filter screen 330 in the stored state enters the filter channel and unfolds, thereby switching to the unfolded state that can be used to filter oil fumes.

[0063] Figure 5 In the unfolded state, the area of ​​filter screen 330 is S1, and the length of push rod is n1; Figure 6 The area of ​​the filter 330 in its unfolded state is S2, and the length of the push rod is n2. Assuming that the minimum unfolded area of ​​the filter 330 is S1 and the maximum unfolded area is S2, then when the area of ​​the filter 330 needs to be adjusted to S, the distance of the push rod is n. The relationship between the length of the push rod n and the unfolded area S of the filter 330 is: n = n1 + (S - S1)(n2 - n1) / (S2 - S1).

[0064] In other embodiments, the movable adjustment component 350 can also achieve the relative position adjustment of the first housing 310 and the second housing 320 through other structures, such as a motor-driven lead screw nut, gear rack or linkage mechanism.

[0065] The adjustment mechanism provided in this embodiment adjusts the area of ​​the unfolded filter screen 330 and maintains the tension of the filter screen 330. The movable adjustment component 350 actively controls the relative position of the first housing 310 and the second housing 320, while the winding / unwinding component 340 works in conjunction with the current adjustment state of the movable adjustment component 350 to tension the filter screen 330. In other embodiments, the winding / unwinding component 340 may also include a motor to achieve active winding and unwinding; the movable adjustment component 350 may include a spring, such as a compression spring, which ensures that the first housing 310 and the second housing 320 always tend to move away from each other, thus tauting the filter screen 330. The unfolded area of ​​the filter screen 330 can be adjusted by winding and unwinding the winding / unwinding component 340.

[0066] In this embodiment, the fume filtration device 300 may further include a heating component (not shown in the figure). The heating component can heat the filter screen 330 to melt grease and other substances on the filter screen 330, thereby cleaning the filter screen 330. This arrangement eliminates the need for periodic removal of the filter screen 330 for cleaning, improving the convenience of using the range hood. Specifically, the heating component may include heating wires disposed in the first rod 311 and / or the second rod 321. Correspondingly, the first rod 311 and / or the second rod 321 with heating wires may be made of a metal material with a high thermal conductivity (such as copper).

[0067] Please continue to refer to Figure 1 In this embodiment, the range hood also includes an exhaust duct 260. The exhaust port 322 of the fume filter 300 is connected to the exhaust duct 260 via a flexible pipe 261. The end of the exhaust duct 260 away from the fume filter 300 forms the outlet 270 of the range hood. Specifically, the first housing 310 of the fume filter 300 is fixed relative to the cabinet 200, while the second housing 320 is movable relative to the cabinet 200. The flexible pipe 261 can deform according to the movement of the second housing 320, thereby providing space for the position adjustment of the second housing 320. In this embodiment, since the diameter of the exhaust port 322 of the second housing 320 is larger than the diameter of the flexible pipe 261, the exhaust port 322 of the second housing 320 is connected to the flexible pipe 261 via a shrink hood 252. An outlet grille 271 is provided at the outlet 270 to prevent foreign objects from entering the duct.

[0068] In this embodiment, the range hood further includes a second detection component 262, which is used to detect the airflow state downstream of the fume filter 300. Optionally, the second detection component 262 includes a second fume concentration sensor, which is disposed in the air outlet duct 260 and is used to detect the fume concentration downstream of the fume filter 300. The detected fume concentration can be used to evaluate the gas quality after filtration by the fume filter 300. Furthermore, the fume concentration upstream and downstream of the fume filter 300 can be used to evaluate the filtration effect of the fume filter 300. Further, the second detection component 262 may also include a second flow rate sensor for detecting airflow velocity. The airflow velocity can characterize the current air volume of the range hood.

[0069] In this embodiment, the range hood also includes a control component 280, which is disposed in the cabinet 200. The first detection component 242, the second detection component 262, the fan 240, and the adjustment mechanism of the fume filter 300 (specifically, the push rod motor 351 in this embodiment) are all electrically connected to the control component 280, thus enabling them to transmit collected signals to the control component 280 or receive instructions from the control component 280 to execute corresponding actions.

[0070] Figure 7 This is a flowchart of a range hood control method in one embodiment of this application. The range hood control method provided in this application can be applied to the range hoods provided in the above embodiments. Figure 7 As shown, the range hood control method includes the following steps.

[0071] Step S100: Obtain the oil fume concentration at the target detection location.

[0072] In this embodiment, the target detection location may include one or more locations. Taking the range hood provided in the above embodiment as an example, the target detection location includes a first detection location upstream of the fume filter 300 and a second detection location downstream of the fume filter 300. Specifically, the first detection location is located at the exhaust pipe 241 of the fan 240, and the second detection location is located at the air outlet duct 260. The fume concentration at the first detection location can be obtained by the first fume concentration sensor in the first detection component 242, and the fume concentration at the second detection location can be obtained by the second fume concentration sensor in the second detection component 262. The airflow at the first detection location has not yet been filtered by the fume filter 300, so the fume concentration at the first detection location can, to some extent, characterize the concentration at the fume inlet 120 of the range hood or the fume concentration near the countertop 100. If the fume concentration at the first detection location is too high, it indicates that there is a lot of fume in the user's cooking environment. The fume concentration at the second detection location can characterize the quality of the gas after being filtered by the fume filter 300.

[0073] It should be understood that in other embodiments, the first detection location can be other locations upstream of the fume filter device 300, such as the air inlet side of the fan 240, the smoke inlet 120, or even a location above the table 100; correspondingly, the first fume concentration sensor can also be set at the location where detection is required as needed. The second detection location can be other locations downstream of the fume filter device 300, such as the outlet 270 of the range hood.

[0074] Step S200: Based on the oil fume concentration at the target detection location, the control adjustment mechanism adjusts the area of ​​the filter 330 in the unfolded state.

[0075] In this embodiment, the area of ​​the unfolded filter 330 is adjusted according to the oil fume concentration at the target detection location, thereby changing the filtration capacity and wind resistance of the oil fume filtration device 300 according to different scenarios, so as to better meet the needs of different scenarios.

[0076] Figure 8 This is a flowchart of step S200 of a range hood control method in one embodiment of this application. Optionally, step S200 specifically includes:

[0077] Step S210: Determine whether the oil fume concentration at the first detection location is greater than the preset concentration value;

[0078] In step S220, if the oil fume concentration at the first detection position is greater than the preset concentration value, the control adjustment mechanism reduces the area of ​​the filter 330 in the unfolded state.

[0079] It's understandable that when the oil fume concentration at the first detection location exceeds the preset concentration value, it means there's a large amount of oil fume in the current kitchen environment. In this case, the fume extraction effect should be prioritized. Therefore, reducing the area of ​​the filter 330 in its unfolded state reduces wind resistance, which can increase the airflow of the range hood and thus improve its fume extraction capacity.

[0080] Furthermore, step S200 also includes:

[0081] Step S230: If the oil fume concentration at the first detection position is not greater than the preset concentration value, determine whether the filtration efficiency has reached the preset efficiency based on the oil fume concentration at the first detection position and the second detection position.

[0082] In step S240, if the filtration efficiency does not reach the preset efficiency, the control adjustment mechanism increases the area of ​​the filter screen 330 in the unfolded state.

[0083] Optionally, the difference in oil fume concentration at the first and second detection positions can be compared with a preset concentration difference. If the difference is greater than the preset concentration difference, the filtration efficiency is considered high, and the preset efficiency is achieved. If the difference is not greater than the preset concentration difference, the filtration efficiency is considered low, and the preset efficiency is not achieved. Alternatively, the ratio of the oil fume concentration at the first and second detection positions can be compared with a preset concentration ratio. If the ratio is greater than the preset concentration ratio, the filtration efficiency is considered high, and the preset efficiency is achieved. If the ratio is not greater than the preset concentration ratio, the filtration efficiency is considered low, and the preset efficiency is not achieved.

[0084] It is understandable that if the oil fume concentration at the first detection location is not greater than the preset concentration value, it means that the current suction capacity of the range hood is sufficient to meet the needs of oil fume extraction. At this time, the filtration efficiency should be the primary consideration to ensure the filtration effect. If the filtration efficiency does not reach the preset efficiency, it means that the quality of the gas discharged from the range hood is poor. Therefore, it is necessary to improve the filtration capacity of the range hood. The specific method is to control the adjustment mechanism to increase the area of ​​the filter screen 330 in the unfolded state.

[0085] Furthermore, step S200 also includes:

[0086] Step S250: If the filtration efficiency reaches the preset efficiency, determine whether the pressure difference between the upstream and downstream of the fume filter 300 reaches the preset difference.

[0087] In step S260, when the pressure difference reaches a preset value, the control adjustment mechanism reduces the area of ​​the filter screen 330 in the unfolded state.

[0088] In this embodiment, the upstream and downstream pressures of the fume filter 300 can be detected by pressure sensors. For example, the first detection component 242 includes a first pressure sensor, and the second detection component 262 includes a second pressure sensor. By collecting the upstream and downstream pressure values ​​of the fume filter 300 and then subtracting them, the pressure difference can be obtained. The pressure difference between the upstream and downstream of the fume filter 300 can also be calculated based on the airflow velocity and the area of ​​the filter screen 330 in its deployed state. The airflow velocity can be detected by the first velocity sensor and / or the second velocity sensor.

[0089] It is understandable that when the filtration efficiency reaches the preset efficiency, it means that the filtration capacity can meet the usage requirements. At this point, it is necessary to consider whether the pressure difference between the upstream and downstream of the fume filter 300 is too large, i.e., whether it has reached the preset difference. A large pressure difference means high air resistance, higher energy consumption of the fan 240, and is detrimental to system reliability. Therefore, when the pressure difference reaches the preset difference, the control and adjustment mechanism reduces the area of ​​the filter screen 330 in the deployed state, thereby reducing the air resistance of the filter screen 330 and reducing the pressure difference between the upstream and downstream of the fume filter 300.

[0090] Furthermore, if the pressure difference does not reach the preset difference, it indicates that the filtration efficiency is good and the pressure difference is low, and the range hood is in a better operating state. Therefore, no adjustment is made, and the status quo is maintained.

[0091] Optionally, before step S100, the range hood control method may further include:

[0092] Step S001: Determine whether the air volume of the range hood is less than the preset air volume;

[0093] If yes, proceed to step S002: increase the fan speed by 240; otherwise, proceed to step S100.

[0094] When the range hood's airflow is less than the preset airflow, it means the suction capacity is insufficient, and the fan speed needs to be increased by 240 to increase the airflow. Once the airflow reaches the preset airflow, steps S100 and S200 are performed to obtain the oil fume concentration and control the oil fume filter device 300. The suction capacity and wind resistance are adjusted by adjusting the unfolded area of ​​the filter screen 330. In other words, in this embodiment, ensuring airflow has the highest priority. By ensuring airflow, the range hood has a certain oil fume extraction capacity. Then, the oil fume extraction capacity and filtration efficiency are balanced based on factors such as oil fume concentration, filtration efficiency, and wind resistance. Specifically, step S001 may include using a first flow velocity sensor and / or a second flow velocity sensor to obtain the airflow velocity upstream and / or downstream of the oil fume filter device 300, then calculating the airflow based on the airflow velocity, and thus determining whether the range hood's airflow is less than the preset airflow.

[0095] Optionally, step S001 can be executed periodically, such as once every 1 second, every 3 seconds, every 5 seconds, every 10 seconds, every 30 seconds, or every 1 minute; or it can return to execute step S001 after each adjustment of the area of ​​the unfolded filter 330, such as after executing steps S220, S240, and S260.

[0096] Figure 9 This is a flowchart of a range hood control method in a specific embodiment of this application. Figure 9As shown, in one specific embodiment, the flow of the range hood control method is as follows:

[0097] First, after the range hood is started, it operates at the set speed. The first detection component 242 acquires the airflow velocity u1 and the oil fume concentration c1 at the first detection position, and the second detection component 262 acquires the airflow velocity u2 and the oil fume concentration c2 at the second detection position. Based on the airflow velocities u1 and u2, it is determined whether the airflow of the range hood is less than the preset airflow. If so, the speed of the fan 240 is increased, and then the process of acquiring u1, c1, u2, and c2 is repeated; otherwise, the oil fume concentration c1 at the first detection position is determined to be greater than the preset concentration value c0. If c1 is greater than c0, the control adjustment mechanism is used to reduce the area of ​​the filter 330 in the unfolded state; if c1 is not greater than c0, the filtration efficiency e is calculated based on c1 and c2, and it is determined whether the filtration efficiency e reaches the preset efficiency e0. If e does not reach e0, the control adjustment mechanism is used to increase the area of ​​the filter 330 in the unfolded state, and the process of acquiring u1, c1, u2, and c2 is repeated. If e reaches e0, then it is determined whether the pressure difference p between the upstream and downstream of the fume filter 300 reaches the preset difference p0. If p reaches p0, the control adjustment mechanism reduces the area of ​​the filter screen 330 in the unfolded state; if p does not reach p0, it means that the fume concentration is low, the filtration efficiency is high, and the wind resistance is small. At this time, the range hood is in a better operating state, so the status quo is maintained or the process returns to the step of obtaining u1, c1, u2, and c2.

[0098] In summary, the embodiments of this application provide an oil fume filtration device 300, a range hood, and a range hood control method. The fume filtration device 300 includes a first housing 310, a second housing 320, a filter screen 330, and an adjustment mechanism. The first housing 310 and the second housing 320 are arranged and connected in the airflow direction. The first housing 310 and the second housing 320 together form a filtration channel. The first housing 310 is provided with an air inlet 313 for the filtration channel, and the second housing 320 is provided with an exhaust outlet 322 for the filtration channel. At least one first rod 311 is provided on the inner wall of the first housing 310, and at least one second rod 321 is provided on the inner wall of the second housing 320. At least a portion of the filter screen 330 is in an unfolded state and located in the filtration channel for filtering airflow. The unfolded filter screen 330 is alternately wound around the first rod 311 and the second rod 321 in a zigzag pattern. The adjustment mechanism is used to adjust the relative position of the first housing 310 and the second housing 320 in the airflow direction to adjust the area of ​​the unfolded filter screen 330. In this embodiment, since the first housing 310 and the second housing 320 can move relative to each other to adjust the area of ​​the filter 330 in the unfolded state, the filtration area can be adjusted according to the actual needs of different scenarios, thus better balancing the filtration effect and wind resistance, thereby improving the user experience.

[0099] The range hood provided in this application includes the above-mentioned fume filtration device 300, and therefore has the advantages of high flexibility and strong applicability to different scenarios.

[0100] The range hood control method provided in this application embodiment is applied to the above-mentioned range hood, and can adjust the area of ​​the unfolded filter 330 according to the concentration of oil fumes, thereby better meeting the usage needs under different oil fume concentrations and improving the user experience.

[0101] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. An oil fume filtration device, characterized in that, The system includes a first housing (310), a second housing (320), a filter screen (330), and an adjustment mechanism. The first housing (310) and the second housing (320) are arranged and connected in the airflow direction. The first housing (310) and the second housing (320) together form a filter channel. The first housing (310) is provided with an air inlet (313) communicating with the filter channel, and the second housing (320) is provided with an exhaust port (322) communicating with the filter channel. The inner wall of the first housing (310) is provided with at least one first rod ( 311), the inner wall of the second housing (320) is provided with at least one second rod (321), at least a portion of the filter (330) is in an unfolded state and located in the filter channel for filtering airflow, the filter (330) in the unfolded state is alternately wound around the first rod (311) and the second rod (321) in a zigzag pattern, the adjustment mechanism is used to adjust the relative position of the first housing (310) and the second housing (320) in the airflow delivery direction to adjust the area of ​​the filter (330) in the unfolded state; The adjustment mechanism includes a movable adjustment component (350) and a retractable component (340). One end of the filter screen (330) is fixed relative to one of the first housing (310) and the second housing (320), and the other end is connected to the retractable component (340). The movable adjustment component (350) is used to drive the first housing (310) and the second housing (320) to move closer to or further away from each other in the airflow direction. The retractable component (340) is used to retract the filter screen (330) in the unfolded state when the first housing (310) and the second housing (320) move closer to each other, and to release the filter screen (330) when the first housing (310) and the second housing (320) move further away from each other.

2. The oil fume filtration device according to claim 1, characterized in that, A portion of the filter (330) can be housed in the retractable assembly (340) and be in a housed state, and the retractable assembly (340) can release the filter (330) in the housed state.

3. The oil fume filtration device according to claim 2, characterized in that, The winding and unwinding assembly (340) includes a coil spring (343), to which the filter screen (330) is connected. The coil spring (343) is used to wind up and unwind the filter screen (330), and the coil spring (343) has a winding tendency to keep the filter screen (330) taut in the unfolded state.

4. The oil fume filtration device according to claim 3, characterized in that, The retractable assembly (340) further includes a storage shell (341), which is disposed on the outside of the first shell (310) or the second shell (320). The coil spring (343) is disposed inside the storage shell (341), and the filter (330) passes through the storage opening (312) on the first shell (310) or the second shell (320).

5. The oil fume filtration device according to claim 2, characterized in that, The movable adjustment assembly (350) includes a push rod motor (351) for driving the first housing (310) and the second housing (320) to move closer to or further away from each other in the airflow direction.

6. The oil fume filtration device according to claim 5, characterized in that, The movable adjustment assembly (350) further includes a transmission component (352). The push rod motor (351) includes a fixed part and a push rod. The fixed part of the push rod motor (351) is connected to one of the first housing (310) and the second housing (320). The transmission component (352) is connected to the other of the first housing (310) and the second housing (320) through two connection points. The push rod of the push rod motor (351) is connected to the transmission component (352). The two connection points of the transmission component (352) are located on opposite sides of the filter channel.

7. The oil fume filtration device according to claim 1, characterized in that, The first housing (310) is sleeved at one end away from the air inlet (313) and the second housing (320) is sleeved at one end away from the exhaust port (322).

8. A range hood, characterized in that, It includes a fan (240) and an oil fume filter device (300) according to any one of claims 1-7, wherein the fan (240) is connected to the oil fume filter device (300).

9. The range hood according to claim 8, characterized in that, The range hood also includes a first oil fume concentration sensor, which is used to detect the oil fume concentration upstream of the oil fume filter (300).

10. The range hood according to claim 9, characterized in that, The range hood also includes a second oil fume concentration sensor, which is used to detect the oil fume concentration downstream of the oil fume filter device (300).

11. The range hood according to claim 10, characterized in that, The range hood also includes an exhaust duct (260), the exhaust port (322) of the fume filter (300) is connected to the exhaust duct (260) through a flexible pipe (261), the end of the exhaust duct (260) away from the fume filter (300) forms the outlet (270) of the range hood, and the second fume concentration sensor is disposed in the exhaust duct (260).

12. A method for controlling a range hood, characterized in that, The range hood control method, applicable to any one of claims 8 to 11, comprises: Obtain the oil fume concentration at the target detection location; Based on the oil fume concentration at the target detection location, the adjustment mechanism is controlled to adjust the area of ​​the filter (330) in the unfolded state.

13. The range hood control method according to claim 12, characterized in that, The target detection position includes a first detection position upstream of the fume filter device (300); the step of controlling the adjustment mechanism to adjust the area of ​​the filter screen (330) in the unfolded state according to the fume concentration at the target detection position includes: Determine whether the oil fume concentration at the first detection location is greater than a preset concentration value; If the oil fume concentration at the first detection position is greater than the preset concentration value, the adjustment mechanism is controlled to reduce the area of ​​the filter (330) in the unfolded state.

14. The range hood control method according to claim 13, characterized in that, The target detection location also includes a second detection location downstream of the fume filter device (300); the step of controlling the adjustment mechanism to adjust the area of ​​the filter screen (330) in the unfolded state according to the fume concentration at the target detection location further includes: If the oil fume concentration at the first detection location is not greater than the preset concentration value, the filtration efficiency is determined based on the oil fume concentrations at the first and second detection locations to determine whether the preset efficiency has been achieved. If the filtration efficiency does not reach the preset efficiency, the adjustment mechanism is controlled to increase the area of ​​the filter screen (330) in the unfolded state.

15. The range hood control method according to claim 14, characterized in that, The step of controlling the adjustment mechanism to adjust the area of ​​the filter (330) in the unfolded state according to the oil fume concentration at the target detection location further includes: If the filtration efficiency reaches the preset efficiency, determine whether the pressure difference between the upstream and downstream of the fume filter (300) reaches the preset difference. When the pressure difference reaches the preset difference, the adjustment mechanism is controlled to reduce the area of ​​the filter (330) in the unfolded state.

Images