Lampblack filtering device, range hood and range hood control method

Abstract

The invention discloses an oil fume filtering device, a range hood and a range hood control method, and relates to the technical field of household appliances. At least one first rod body is arranged on the inner wall of a first shell of the oil smoke filtering device, at least one second rod body is arranged on the inner wall of a second shell, and at least one part of a filter screen is in an unfolded state, located in a filtering channel and used for filtering airflow. The filter screen in the unfolded state is alternately wound around the first rod body and the second rod body to be in a broken line circuitous shape, and the adjusting mechanism is used for adjusting the relative position of the first shell and the second shell in the airflow conveying direction so as to adjust the area of the filter screen in the unfolded state. The first shell and the second shell can move relative to each other so as to adjust the area of the filter screen in the unfolded state, so that the filter area can be adjusted according to the actual requirements of different scenes, the filter effect and the wind resistance are well balanced, and the use experience of a user is improved.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to an oil fume filtering device, an oil fume hood, and an oil fume hood control method. Background Art

[0002] In existing range hoods, oil fumes are filtered by setting a purification filter, thereby improving the cleanliness of the air discharged from the range hood. Under the same air duct size, the larger the area of ​​the filter, the better the filtering effect; but the larger the filter area, the greater the wind resistance, which will reduce the range hood's ability to absorb oil fumes, and may cause the oil fumes in the kitchen to not be completely absorbed, reducing the user experience in the kitchen. The filter of the range hood in the related art usually has a fixed purification area, which cannot be adjusted according to the current scene, and cannot balance the wind resistance and filtering ability well in different scenes. It is difficult to meet the use requirements of different scenes, and the user experience is not good. Summary of the invention

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

[0004] The embodiments of the present application can be implemented as follows: In the first aspect, the present application provides an oil fume filtering device, comprising a first shell, a second shell, a filter and an adjustment mechanism, the first shell and the second shell are arranged and connected in the air flow conveying direction, the first shell and the second shell together form a filter channel, the first shell is provided with an air inlet connected to the filter channel, the second shell is provided with an exhaust port connected to the filter channel, the inner wall of the first shell is provided with at least one first rod body, the inner wall of the second shell is provided with at least one second rod body, at least a portion of the filter is in an expanded state and is located in the filter channel for filtering the air flow, the filter in the expanded state is alternately wound around the first rod body and the second rod body to form a folded line, and the adjustment mechanism is used to adjust the relative position of the first shell and the second shell in the air flow conveying direction to adjust the area of ​​the filter in the expanded state.

[0005] In an optional embodiment, the adjustment mechanism includes a movable adjustment component and a retractable component, one end of the filter is fixed relative to one of the first shell and the second shell, and the other end is connected to the retractable component, the movable adjustment component is used to adjust the relative position of the first shell and the second shell in the airflow conveying direction; a part of the filter can be stored in the retractable component and is in a stored state, and the retractable component is used to release the filter in the stored state or retract the filter in the expanded state.

[0006] In an optional embodiment, the retractable assembly includes a coil spring, the filter screen is connected to the coil spring, the coil spring is used to reel in and unreel the filter screen, and the coil spring has a tendency to reel in to keep the filter screen in an unfolded state taut.

[0007] In an optional embodiment, the storage assembly further includes a storage shell, which is disposed on the outside of the first shell or the second shell, the coil spring is disposed in the storage shell, and the filter passes through a storage opening on the first shell or the second shell.

[0008] In an optional embodiment, the movement and adjustment assembly includes a push rod motor, and the push rod motor is used to drive the first shell and the second shell to move closer to or away from each other in the airflow conveying direction.

[0009] In an optional embodiment, the movable adjustment component also includes a transmission member, 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 shell and the second shell, the transmission member is connected to the other of the first shell and the second shell through two connection points, the push rod of the push rod motor is connected to the transmission member, and the two connection points of the transmission member are respectively located on opposite sides of the filter channel.

[0010] In an optional embodiment, one end of the first shell facing away from the air inlet is sleeved with one end of the second shell facing away from the air outlet.

[0011] In a second aspect, the present application provides a range hood, comprising a fan and the oil fume filtering device of any one of the aforementioned embodiments, wherein the fan is connected to the oil fume filtering device.

[0012] In an optional embodiment, the range hood further includes a first oil fume concentration sensor, and the first oil fume concentration sensor is used to detect the oil fume concentration upstream of the oil fume filtering device.

[0013] In an optional embodiment, the range hood further includes a second oil fume concentration sensor, and the second oil fume concentration sensor is used to detect the oil fume concentration downstream of the oil fume filtering device.

[0014] In an optional embodiment, the range hood further includes an air outlet duct, the exhaust port of the oil fume filtering device is connected to the air outlet duct via a flexible tube, one end of the air outlet duct away from the oil fume filtering device forms an outlet of the range hood, and a second oil fume concentration sensor is arranged on the air outlet duct.

[0015] In a third aspect, the present application provides a range hood control method, which is applied to the range hood of any one of the aforementioned embodiments, and the range hood control method includes: Obtain the oil smoke concentration at the target detection location; According to the oil smoke concentration at the target detection position, the control regulating mechanism adjusts the area of ​​the filter in the expanded state.

[0016] In an optional embodiment, the target detection position includes a first detection position upstream of the oil fume filtering device; and the step of controlling the adjustment mechanism to adjust the area of ​​the filter in the deployed state according to the oil fume concentration at the target detection position includes: Determine whether the oil smoke concentration at the first detection position is greater than a preset concentration value; When the oil smoke concentration at the first detection position is greater than a preset concentration value, the control regulating mechanism is controlled to reduce the area of ​​the filter in the unfolded state.

[0017] In an optional embodiment, the target detection position further includes a second detection position downstream of the oil fume filtering device; and the step of controlling the adjustment mechanism to adjust the area of ​​the filter in the deployed state according to the oil fume concentration at the target detection position further includes: When the oil smoke concentration at the first detection position is not greater than the preset concentration value, judging whether the filtration efficiency reaches the preset efficiency according to the oil smoke concentrations at the first detection position and the second detection position; When the filtering efficiency does not reach the preset efficiency, the control regulating mechanism increases the area of ​​the filter screen in the expanded state.

[0018] In an optional embodiment, the step of controlling the regulating mechanism to adjust the area of ​​the filter in the deployed state according to the fume concentration at the target detection position further includes: When the filtration efficiency reaches the preset efficiency, determining whether the pressure difference between the upstream and downstream of the oil fume filtration device reaches the preset difference; When the pressure difference reaches a preset difference, the regulating mechanism is controlled to reduce the area of ​​the filter in the expanded state.

[0019] The beneficial effects of the oil fume filtering device, the range hood and the range hood control method provided by the embodiments of the present application include: The oil fume filtering device provided by the present application includes a first shell, a second shell, a filter screen and an adjustment mechanism, the first shell and the second shell are arranged and connected in the air flow conveying direction, the first shell and the second shell together enclose a filter channel, the first shell is provided with an air inlet of the filter channel, the second shell is provided with an exhaust port of the filter channel, the inner wall of the first shell is provided with at least one first rod body, the inner wall of the second shell is provided with at least one second rod body, at least a part of the filter screen is in an unfolded state and is located in the filter channel for filtering the air flow, the filter screen in the unfolded state is alternately wound around the first rod body and the second rod body to present a folded line circuitous shape, and the adjustment mechanism is used to adjust the relative position of the first shell and the second shell in the air flow conveying direction to adjust the area of ​​the filter screen in the unfolded state. In the embodiment of the present application, since the first shell and the second shell can move relative to each other to adjust the area of ​​the filter screen in the unfolded state, the filter area can be adjusted according to the actual needs of different scenes, and the filtering effect and wind resistance can be better balanced, thereby improving the user experience.

[0020] The range hood provided in the embodiment of the present application includes the above-mentioned fume filtering device, and therefore has the advantages of high flexibility and strong applicability to different scenarios.

[0021] The range hood control method provided in the embodiment of the present application is applied to the above-mentioned range hood, and can adjust the area of ​​the filter in the unfolded state according to the oil fume concentration, so as to better meet the usage requirements under different oil fume concentrations and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of a range hood in one embodiment of the present application; Figure 2 This is a schematic diagram of an air inlet side of an oil fume filtering device in an embodiment of the present application; Figure 3 This is a schematic diagram of one side of the exhaust port of the oil fume filtering device in one embodiment of the present application; Figure 4 This is an exploded view of an oil fume filtering device in one embodiment of the present application; Figure 5 and Figure 6 A cross-sectional view of an oil fume filtering device in an embodiment of the present application when the first shell and the second shell are in different relative positions; Figure 7 This is a flow chart of a range hood control method in one embodiment of the present application; Figure 8 This is a flow chart of step S200 of a range hood control method in one embodiment of the present application; Fig. 9 This is a flow chart of a range hood control method in a specific embodiment of the present application.

[0024] Icons: 001-cookware; 100-table; 110-cooker; 120-smoke inlet; 121-smoke inlet grille; 200-cabinet; 210-oil net; 220-oil cup; 230-flow guide; 240-fan; 241-exhaust pipe; 242-first detection component; 251-diffuser cover; 252-contraction cover; 260-air outlet; 261-flexible pipe; 262-second detection component; 270-export; 271- Outlet grille; 280-control component; 300-oil fume filtering device; 310-first shell; 311-first rod; 312-storage port; 313-air inlet; 320-second shell; 321-second rod; 322-exhaust port; 330-filter; 340-retractable component; 341-storage shell; 342-installation shaft; 343-coil spring; 350-movable adjustment component; 351-push rod motor; 352-transmission member. DETAILED DESCRIPTION

[0025] The filtration area of ​​the filter in the range hood in the related art is fixed, which makes it difficult for the range hood to meet different usage requirements in different scenarios. For example, during the cooking process, when the amount of oil smoke is large and seriously affects the user experience, the main task of the range hood is to improve the oil fume absorption effect, and the filtration efficiency of the oil fume filtering device should be secondary. The filter in the related technology is set with a fixed area to ensure the filtering effect, which will cause greater wind resistance when the air volume needs to be increased, which is not conducive to the improvement of the oil fume absorption effect. When the air volume of the range hood can meet the smoking effect, the range hood is required to have better filtering ability to improve the purification effect of the range hood. However, the existing range hoods cannot adjust the filter.

[0026] To this end, the embodiment of the present application provides an oil fume filtering device and a range hood, wherein the filtering area of ​​the filter screen is adjustable, so that it can meet the use requirements of different scenarios. In addition, the embodiment of the present application also provides a range hood control method, which automatically adjusts the filtering area of ​​the filter screen according to the oil fume concentration, thereby improving the user experience.

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0032] It should be noted that, in the absence of conflict, the features in the embodiments of the present application may be combined with each other.

[0033] Figure 1 FIG. 1 is a schematic diagram of a range hood in one embodiment of the present application. Figure 1 As shown, the range hood provided in the embodiment of the present application is an island-table integrated machine, and the range hood includes a table 100 and a cabinet 200, a fan 240 and an oil fume filter 300 arranged under the table 100, and the fan 240 and the oil fume filter 300 are both arranged in the cabinet 200. The range hood has a smoke inlet 120 and an outlet 270. In this embodiment, the smoke inlet 120 is arranged on the table 100. Along the airflow conveying direction, the smoke inlet 120, the fan 240, the oil fume filter 300, and the outlet 270 are connected in sequence to form an air duct of the range hood. A stove 110 is arranged on the table 100, and the user can place the pot 001 on the stove 110 for heating. The fan 240 is used to provide power for airflow conveying. In this embodiment, along the airflow conveying direction, the fan 240 is arranged upstream of the oil fume filter 300. In other embodiments, the fan 240 can also be arranged downstream of the oil fume filter 300.

[0034] In this embodiment, the range hood is described as an island-type integrated range hood. It should be understood that in other optional embodiments, the range hood can also be of other types, such as a ceiling-type range hood. The following describes the various components of the range hood along the airflow direction.

[0035] In this embodiment, a smoke inlet grille 121 is provided at the smoke inlet 120 of the range hood to block objects on the counter 100 and prevent them from falling into the air duct. An oil net 210 is provided below the smoke inlet grille 121. The oil net 210 can adhere to a part of the oil smoke particles in the airflow and play a certain filtering role. An oil cup 220 is provided below the oil net 210. The oil cup 220 can catch and temporarily store the oil droplets falling from the oil net 210. The oil cup 220 is set to be detachable, which can be easily disassembled and cleaned by the user. A guide part 230 is provided in the cabinet 200. The guide part 230 forms a part of the side wall of the air duct. The guide part 230 is used to guide the airflow after passing through the oil net 210 to the air inlet side of the fan 240.

[0036] In this embodiment, the fan 240 is a centrifugal fan, which has the characteristics of axial air intake and radial air outlet. In other optional embodiments, the fan 240 can also be of other types, such as an axial flow fan, a cross-flow fan, etc.

[0037] The exhaust side of the fan 240 is connected to the air inlet 313 of the oil fume filtering device 300. In this embodiment, the exhaust side of the fan 240 has an exhaust pipe 241, one end of the exhaust pipe 241 is connected to the volute of the fan 240, and the other end is connected to the air inlet 313 of the oil fume filtering device 300. Since the diameter of the exhaust pipe 241 is smaller than the diameter of the air inlet 313 of the oil fume filtering device 300, the exhaust pipe 241 is connected to the air inlet 313 of the oil fume filtering device 300 through a diffuser cover 251. In this embodiment, the exhaust pipe 241 of the fan 240 is also provided with a first detection component 242, and the first detection component 242 can detect the state of the airflow. Optionally, the first detection component 242 can include a first oil fume concentration sensor for detecting the oil fume concentration upstream of the oil fume filtering device 300, and a first flow rate sensor for detecting the flow rate of the airflow.

[0038] Figure 2 This is a schematic diagram of one side of the air inlet 313 of the oil fume filtering device 300 in one embodiment of the present application; Figure 3 This is a schematic diagram of one side of the exhaust port 322 of the oil fume filtering device 300 in one embodiment of the present application; Figure 4 FIG. 1 is an exploded view of an oil fume filtering device 300 in one embodiment of the present application. Figures 2 to 4As shown, the oil fume filtering device 300 of the embodiment of the present application includes a first shell 310, a second shell 320, a filter screen 330 and an adjustment mechanism. The first shell 310 and the second shell 320 are arranged and connected in the air flow conveying direction, and the first shell 310 and the second shell 320 together form a filtering channel. The first shell 310 is provided with an air inlet 313 connected to the filtering channel, and the second shell 320 is provided with an exhaust port 322 connected to the filtering channel. The air inlet 313 and the exhaust port 322 are respectively located at opposite ends of the oil fume filtering device 300. At least one first rod 311 is provided on the inner wall of the first shell 310, and at least one second rod 321 is provided on the inner wall of the second shell 320. At least a portion of the filter 330 is in an expanded state and is located in the filter channel for filtering the airflow. The filter 330 in the expanded state is alternately wound around the first rod 311 and the second rod 321 to form a folded line. The adjustment mechanism is used to adjust the relative positions of the first shell 310 and the second shell 320 in the airflow conveying direction to adjust the area of ​​the filter 330 in the expanded state.

[0039] In this embodiment, the filter screen 330 is woven from a high temperature resistant flexible material, such as a high temperature resistant flexible material such as a carbon fiber felt material. The first rod body 311 and the second rod body 321 can be cylindrical or prismatic.

[0040] Figure 5 and Figure 6 This is a cross-sectional view of the oil fume filtering device 300 in one embodiment of the present application when the first shell 310 and the second shell 320 are in different relative positions. Figures 2 to 6 In this embodiment, one end of the first shell 310 facing away from the air inlet 313 and one end of the second shell 320 facing away from the exhaust port 322 are sleeved, so that the first shell 310 and the second shell 320 can move relative to each other in the airflow conveying direction, and at the same time ensure that the connection position has better air tightness, so as to prevent smoke from flowing from between the first shell 310 and the second shell 320 to the outside of the filter channel. Specifically in this embodiment, the first shell 310 is sleeved on the outside of the second shell 320. In addition to the sleeve-type movable connection, flexible parts can also be used for connection, which can also ensure that the first shell 310 and the second shell 320 can move relative to each other and the air tightness of the connection. Figure 5 and Figure 6 In the figure, the air flow direction is from left to right.

[0041] In this embodiment, a plurality of first rod bodies 311 are disposed in the first housing 310, and the plurality of first rod bodies 311 are disposed in parallel and spaced apart, and are arranged along a direction perpendicular to the air flow conveying direction; a plurality of second rod bodies 321 are disposed in the second housing 320, and the plurality of second rod bodies 321 are disposed in parallel and spaced apart, and are arranged along a direction perpendicular to the air flow conveying direction, and the second rod bodies 321 are parallel to the first rod bodies 311. In this embodiment, the filter screen 330 in the unfolded state is alternately wound around the plurality of first rod bodies 311 and the plurality of second rod bodies 321 to form a zigzag shape, and when the first housing 310 and the second housing 320 are close to each other, the distance between the first rod body 311 and the second rod body 321 in the air flow conveying direction becomes smaller (such as Figure 5 In the figure, the area of ​​the filter 330 in the unfolded state becomes smaller. At this time, the filtering effect of the filter 330 is weakened and the wind resistance is reduced. When the first shell 310 and the second shell 320 are separated from each other, the distance between the first rod body 311 and the second rod body 321 in the air flow conveying direction becomes larger (such as Figure 6 In the middle L2, the area of ​​the filter 330 in the unfolded state becomes larger. At this time, the filtering effect of the filter 330 is enhanced and the wind resistance becomes larger.

[0042] In this embodiment, the adjustment mechanism includes a movable adjustment component 350 and a retractable component 340. One end of the filter 330 is fixed relative to one of the first shell 310 and the second shell 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 shell 310 and the second shell 320 in the airflow conveying direction; a part of the filter 330 can be stored in the retractable component 340 and is in a stored state, and the retractable component 340 is used to release the filter 330 in the stored state or retract the filter 330 in the expanded state. In this embodiment, one end of the filter 330 is fixed relative to the first shell 310, for example, fixedly connected to the first rod 311 farthest 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 shell 310.

[0043] Further, the retractable assembly 340 in this embodiment is arranged on the outside of the first housing 310 or the second housing 320. The retractable assembly 340 includes a storage shell 341, a mounting shaft 342 and a coil spring 343. The storage shell 341 is arranged 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 arranged in the storage shell 341 and connected to the mounting shaft 342. The filter screen 330 is connected to the coil spring 343, and the filter screen 330 passes through the storage opening 312 on the first housing 310 or the second housing 320. The coil spring 343 is used to reel in and unreel the filter screen 330, and the coil spring 343 has a tendency to reel in to keep the filter screen 330 in the unfolded state taut. Specifically in this embodiment, the retractable assembly 340 is disposed on the first housing 310, the storage shell 341 is fixedly connected to the outside of the first housing 310, and the storage port 312 is disposed on the top of the first housing 310. The coil spring 343 can be driven independently of the motor to realize the storage and tensioning of the filter 330.

[0044] In this embodiment, the mobile adjustment component 350 includes a push rod motor 351, which is used to drive the first housing 310 and the second housing 320 to move closer to or farther from each other in the air flow conveying direction. 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, and the push rod is connected to the other of the first housing 310 and the second housing 320 in a transmission connection to adjust the relative position of the first housing 310 and the second housing 320. Further, the mobile adjustment component 350 also includes a transmission member 352, 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 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 respectively located on opposite sides of the filter channel. By providing the transmission member 352 and connecting the transmission member 352 with the first housing 310 or the second housing 320 at two connection points, the push rod motor 351 can reliably apply thrust to the first housing 310 or the second housing 320, thereby avoiding the first housing 310 or the second housing 320 having a tendency to rotate due to a single-point push, which ultimately leads 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 side of the first housing 310 with the retractable assembly 340, and the transmission member 352 is connected to the second housing 320.

[0045] In this embodiment, when the push rod motor 351 extends the push rod, the second shell 320 moves away from the first shell 310, the second rod body 321 moves away from the first rod body 311 and pulls the filter 330, the pulled filter 330 overcomes the winding force of the coil spring 343, so that the retractable assembly 340 is unwound, and the filter 330 in the stored state enters the filter channel and unfolds, thereby switching to an unfolded state that can be used to filter oil smoke.

[0046] Figure 5 In the figure, the area of ​​the filter screen 330 in the unfolded state is S1, and the length of the push rod is n1; Figure 6 The area of ​​the filter 330 in the expanded state is S2, and the length of the push rod is n2. Assuming that the minimum expanded area of ​​the filter 330 is S1 and the maximum expanded area is S2, when the area of ​​the filter 330 needs to be adjusted to S, the distance of the push rod is n, and the relationship between the length n of the push rod and the expanded area S of the filter 330 is: n=n1+(S-S1)(n2-n1) / (S2-S1).

[0047] In other embodiments, the movable adjustment component 350 can also achieve the relative position adjustment of the first shell 310 and the second shell 320 through other structures, such as achieving the relative position adjustment of the first shell 310 and the second shell 320 through a motor-driven screw nut, a gear rack or a connecting rod mechanism.

[0048] The function of the adjustment mechanism provided in the embodiment of the present application is to adjust the area of ​​the filter 330 in the unfolded state and to keep the filter 330 taut, wherein the mobile adjustment component 350 actively controls and adjusts the relative position of the first shell 310 and the second shell 320, and the retractable component 340 cooperates with the current adjustment state of the mobile adjustment component 350 to tighten the filter 330. In other embodiments, the retractable component 340 may also include a motor to achieve active winding and unwinding; the mobile adjustment component 350 may include a spring, such as a compression spring, and the mobile adjustment component 350 makes the first shell 310 and the second shell 320 always have a tendency to move away from each other, so that the filter 330 can be tightened, and the unfolded area of ​​the filter 330 can be adjusted by winding and unwinding the retractable component 340.

[0049] In the embodiment of the present application, the oil fume filtering device 300 may further include a heating component (not shown in the figure), which can heat the filter 330 to melt the grease and other substances on the filter 330 to clean the filter 330. With such a configuration, there is no need to regularly remove the filter 330 for cleaning, which improves the convenience of using the range hood. Specifically, the heating component may include a heating wire disposed in the first rod body 311 and / or the second rod body 321. Correspondingly, the first rod body 311 and / or the second rod body 321 provided with the heating wire may be made of a metal material with a high thermal conductivity (such as copper).

[0050] Please continue to refer to Figure 1 In this embodiment, the range hood further comprises an air outlet duct 260, and the exhaust port 322 of the oil fume filter device 300 is connected to the air outlet duct 260 through a flexible tube 261, and one end of the air outlet duct 260 away from the oil fume filter device 300 forms an outlet 270 of the range hood. Specifically, the first shell 310 of the oil fume filter device 300 is fixed relative to the cabinet 200, and the second shell 320 is movable relative to the cabinet 200, and the flexible tube 261 can be deformed according to the movement of the second shell 320, thereby providing space for adjusting the position of the second shell 320. In this embodiment, since the diameter of the exhaust port 322 of the second shell 320 is larger than the diameter of the flexible tube 261, the exhaust port 322 of the second shell 320 is connected to the flexible tube 261 through the shrink cover 252. An outlet grille 271 is provided at the outlet 270 to prevent foreign matter from entering the air duct.

[0051] In this embodiment, the range hood further includes a second detection component 262, which is used to detect the airflow state downstream of the oil fume filter device 300. Optionally, the second detection component 262 includes a second oil fume concentration sensor, which is arranged in the air outlet pipeline 260 and is used to detect the oil fume concentration downstream of the oil fume filter device 300. The detected oil fume concentration can be used to evaluate the quality of the gas after being filtered by the oil fume filter device 300. In addition, the oil fume concentration upstream and downstream of the oil fume filter device 300 can be used to evaluate the filtering effect of the oil fume filter device 300. Further, the second detection component 262 can also include a second flow rate sensor for detecting the airflow velocity. The airflow velocity can characterize the current air volume of the range hood.

[0052] In this embodiment, the range hood further 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 oil fume filter 300 (specifically the push rod motor 351 in this embodiment) are all electrically connected to the control component 280, so that the collected signals can be transmitted to the control component 280 or the instructions of the control component 280 can be received to perform corresponding actions.

[0053] Figure 7 Flow chart of a range hood control method in one embodiment of the present application. The range hood control method provided in the embodiment of the present application can be applied to the range hood provided in the above embodiment. Figure 7 As shown, the range hood control method includes the following steps.

[0054] Step S100, obtaining the oil smoke concentration at the target detection position.

[0055] In the embodiment of the present application, the target detection position may include one or more positions. Taking the range hood provided in the above embodiment of the present application as an example, the target detection position includes a first detection position upstream of the oil fume filter device 300 and a second detection position downstream of the oil fume filter device 300. Specifically, the first detection position is located at the exhaust pipe 241 of the fan 240, and the second detection position is located at the air outlet duct 260. The oil fume concentration at the first detection position can be obtained by the first oil fume concentration sensor in the first detection component 242, and the oil fume concentration at the second detection position can be obtained by the second oil fume concentration sensor in the second detection component 262. The airflow has not been filtered by the oil fume filter device 300 at the first detection position, so the oil fume concentration at the first detection position can represent the concentration at the smoke inlet 120 of the range hood or the oil fume concentration near the table 100 to a certain extent. If the oil fume concentration at the first detection position is too large, it means that there is more oil fume in the cooking environment where the user is located. The oil fume concentration at the second detection position can represent the quality of the gas after being filtered by the oil fume filter device 300.

[0056] It should be understood that in other embodiments, the first detection position may be other positions upstream of the oil fume filtering device 300, such as the air intake side of the fan 240, the smoke inlet 120, or even a position above the table 100; correspondingly, the first oil fume concentration sensor may also be set at a position where detection is required as needed. The second detection position may be other positions downstream of the oil fume filtering device 300, such as the outlet 270 of the range hood.

[0057] Step S200 , controlling the regulating mechanism to adjust the area of ​​the filter 330 in the unfolded state according to the oil smoke concentration at the target detection position.

[0058] In the embodiment of the present application, the area of ​​the filter 330 in the unfolded state is adjusted according to the oil fume concentration at the target detection position, so that the filtering capacity and wind resistance of the oil fume filtering device 300 can be changed according to different scenes, thereby better meeting the needs of different scenes.

[0059] Figure 8 This is a flow chart of step S200 of the range hood control method in one embodiment of the present application. Optionally, step S200 specifically includes: Step S210, determining whether the oil smoke concentration at the first detection position is greater than a preset concentration value; Step S220 , when the oil smoke concentration at the first detection position is greater than a preset concentration value, the regulating mechanism is controlled to reduce the area of ​​the filter 330 in the unfolded state.

[0060] It can be understood that when the oil fume concentration at the first detection position is greater than the preset concentration value, it means that the amount of oil fume in the current kitchen environment is large, and the oil fume absorption effect should be improved first. Therefore, reducing the area of ​​the filter 330 in the unfolded state and reducing wind resistance can increase the air volume of the range hood, thereby improving the oil fume absorption ability.

[0061] Furthermore, step S200 further includes: Step S230, when the oil smoke concentration at the first detection position is not greater than a preset concentration value, judging whether the filtration efficiency reaches a preset efficiency according to the oil smoke concentrations at the first detection position and the second detection position; Step S240: When the filtration efficiency does not reach the preset efficiency, the regulating mechanism is controlled to increase the area of ​​the filter screen 330 in the unfolded state.

[0062] Optionally, by comparing the difference between the oil fume concentrations at the first detection position and the second detection position with the preset concentration difference, if the difference between the oil fume concentrations at the first detection position and the second detection position is greater than the preset concentration difference, it can be considered that the filtration efficiency is high and it is determined that the preset efficiency has been reached; if the difference between the oil fume concentrations at the first detection position and the second detection position is not greater than the preset concentration difference, it can be considered that the filtration efficiency is low and it is determined that the preset efficiency has not been reached. Alternatively, by comparing the ratio of the oil fume concentrations at the first detection position and the second detection position with the preset concentration ratio, if the ratio of the oil fume concentrations at the first detection position and the second detection position is greater than the preset concentration ratio, it can be considered that the filtration efficiency is high and it is determined that the preset efficiency has been reached; if the ratio of the oil fume concentrations at the first detection position and the second detection position is not greater than the preset concentration ratio, it can be considered that the filtration efficiency is low and it is determined that the preset efficiency has not been reached.

[0063] It can be understood that when the oil fume concentration at the first detection position is not greater than the preset concentration value, it means that the current range hood suction capacity is sufficient to meet the demand for oil fume suction, and the filtering efficiency should be mainly considered to ensure the filtering effect. When the filtering efficiency does not reach the preset efficiency, it means that the quality of the gas discharged from the range hood is poor, so it is necessary to improve the filtering capacity of the range hood, and the specific method is to control the adjustment mechanism to increase the area of ​​the filter 330 in the unfolded state.

[0064] Furthermore, step S200 further includes: Step S250, when the filtering efficiency reaches the preset efficiency, determining whether the pressure difference between the upstream and downstream of the oil fume filtering device 300 reaches the preset difference; Step S260, when the pressure difference reaches a preset difference, the regulating mechanism is controlled to reduce the area of ​​the filter screen 330 in the expanded state.

[0065] In this embodiment, the pressures upstream and downstream of the oil fume filtering device 300 can be detected by pressure sensors, for example, the first detection component 242 further includes a first pressure sensor, and the second detection component 262 further includes a second pressure sensor, and the pressure values ​​upstream and downstream of the oil fume filtering device 300 are respectively collected and then subtracted to obtain a pressure difference. The pressure difference between the upstream and downstream of the oil fume filtering device 300 can also be calculated based on the airflow velocity and the area of ​​the filter 330 in the unfolded state, and the airflow velocity can be detected by the first velocity sensor and / or the second velocity sensor.

[0066] It can be understood that when the filtration efficiency reaches the preset efficiency, it means that the filtration capacity can meet the use requirements. At this time, it is necessary to consider whether the pressure difference between the upstream and downstream of the oil fume filter device 300 is too large, that is, whether it reaches the preset difference. A large pressure difference means a large wind resistance, a large energy consumption of the fan 240 and is not conducive to system reliability. Therefore, when the pressure difference reaches the preset difference, the control adjustment mechanism reduces the area of ​​the filter 330 in the unfolded state, thereby reducing the wind resistance of the filter 330 and reducing the pressure difference between the upstream and downstream of the oil fume filter device 300.

[0067] Furthermore, if the pressure difference does not reach the preset difference, it means that the filtration efficiency is good and the pressure difference is low at this time, and the range hood is in a better operating state, so no adjustment is made and the status quo is maintained.

[0068] Optionally, before performing step S100, the range hood control method may further include: Step S001, determining whether the air volume of the range hood is less than a preset air volume; If yes, execute step S002: increase the speed of the fan 240; otherwise, execute step S100.

[0069] When the air volume of the range hood is less than the preset air volume, it means that the suction capacity is insufficient, and the speed of the fan 240 needs to be increased to increase the air volume. When the air volume reaches the preset air volume, the acquisition of the fume concentration and the related control of the fume filter device 300 in step S100 and step S200 are performed, and the suction capacity and wind resistance are adjusted by adjusting the expansion area of ​​the filter 330. In other words, in this embodiment, ensuring the air volume has the highest priority, and the range hood is guaranteed to have a certain fume extraction capacity by ensuring the air volume, and then the fume extraction capacity and the filtration efficiency are balanced according to factors such as fume concentration, filtration efficiency and wind resistance. Specifically, step S001 may include using the first flow rate sensor and / or the second flow rate sensor to obtain the air flow velocity upstream and / or downstream of the fume filter device 300, and then calculating the air volume according to the air flow velocity, and then judging whether the air volume of the range hood is less than the preset air volume.

[0070] Optionally, step S001 can be executed periodically, for example, every 1 second, every 3 seconds, every 5 seconds, every 10 seconds, every 30 seconds or every 1 minute; or it can return to step S001 after each adjustment of the area of ​​the filter 330 in the expanded state, for example, returning to step S001 after executing step S220, step S240 and step S260.

[0071] Fig. 9 FIG. 1 is a flow chart of a range hood control method in a specific embodiment of the present application. Fig. 9 As shown, in a specific embodiment, the flow of the range hood control method is as follows: First, the range hood is started and operated according to the set gear. The first detection component 242 obtains the airflow velocity u1 and the oil fume concentration c1 at the first detection position, and the second detection component 262 obtains the airflow velocity u2 and the oil fume concentration c2 at the second detection position, and determines whether the air volume of the range hood is less than the preset air volume according to the airflow velocities u1 and u2. If so, the speed of the fan 240 is increased, and then the steps of obtaining u1, c1, u2 and c2 are returned; otherwise, it is determined whether the oil fume concentration c1 at the first detection position is greater than the preset concentration value c0. If c1 is greater than c0, the control regulating mechanism is controlled 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 according to 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 regulating mechanism is controlled to increase the area of ​​the filter 330 in the unfolded state, and the steps of obtaining u1, c1, u2 and c2 are returned. If e reaches e0, it is determined whether the pressure difference p between the upstream and downstream of the oil fume filter device 300 reaches the preset difference p0. If p reaches p0, the control mechanism is controlled to reduce the area of ​​the filter 330 in the unfolded state; if p does not reach p0, it means that the oil fume concentration is low, the filtration efficiency is high, and the wind resistance is small. At this time, the range hood is in a good operating state, so the status quo is maintained or the process of obtaining u1, c1, u2 and c2 is returned.

[0072] In summary, the embodiments of the present application provide an oil fume filtering device 300, a range hood, and a range hood control method. The oil fume filtering device 300 includes a first shell 310, a second shell 320, a filter 330 and an adjustment mechanism. The first shell 310 and the second shell 320 are arranged and connected in the air flow conveying direction. The first shell 310 and the second shell 320 jointly form a filter channel. The first shell 310 is provided with an air inlet 313 of the filter channel, and the second shell 320 is provided with an exhaust port 322 of the filter channel. The inner wall of the first shell 310 is provided with at least one first rod body 311, and the inner wall of the second shell 320 is provided with at least one second rod body 321. At least a part of the filter 330 is in an expanded state and is located in the filter channel for filtering the air flow. The filter 330 in the expanded state is alternately wound around the first rod body 311 and the second rod body 321 to form a broken line. The adjustment mechanism is used to adjust the relative position of the first shell 310 and the second shell 320 in the air flow conveying direction to adjust the area of ​​the filter 330 in the expanded state. In the embodiment of the present application, since the first shell 310 and the second shell 320 can move relative to each other to adjust the area of ​​the filter 330 in the expanded state, the filtering area can be adjusted according to the actual needs of different scenarios, and the filtering effect and wind resistance can be better balanced, thereby improving the user experience.

[0073] The range hood provided in the embodiment of the present application includes the above-mentioned oil fume filtering device 300, and therefore has the advantages of high flexibility and strong applicability to different scenarios.

[0074] The range hood control method provided in the embodiment of the present application is applied to the above-mentioned range hood, and can adjust the area of ​​the filter 330 in the unfolded state according to the oil fume concentration, so as to better meet the usage requirements under different oil fume concentrations and improve the user experience.

[0075] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be included in the protection scope of the present application.

Claims

1. A fume filtering device, characterized in that: The invention comprises a first shell (310), a second shell (320), a filter screen (330) and an adjustment mechanism, wherein the first shell (310) and the second shell (320) are arranged in an air flow conveying direction and are connected, the first shell (310) and the second shell (320) together form a filter channel, the first shell (310) is provided with an air inlet (313) connected to the filter channel, the second shell (320) is provided with an air outlet (322) connected to the filter channel, and the inner wall of the first shell (310) is provided with at least one first rod ( 311), at least one second rod (321) is provided on the inner wall of the second shell (320), at least a portion of the filter (330) is in an expanded state and is located in the filter channel for filtering the airflow, the filter (330) in the expanded state is alternately wound around the first rod (311) and the second rod (321) to form a folded line, and the adjustment mechanism is used to adjust the relative position of the first shell (310) and the second shell (320) in the airflow conveying direction, so as to adjust the area of ​​the filter (330) in the expanded state.

2. The oil fume filtering device according to claim 1, characterized in that: The adjustment mechanism comprises a movable adjustment component (350) and a retractable component (340); one end of the filter (330) is fixed relative to one of the first shell (310) and the second shell (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 shell (310) and the second shell (320) in the airflow conveying direction; a part of the filter (330) can be retracted in the retractable component (340) and is in a retracted state; the retractable component (340) is used to release the filter (330) in the retracted state or to retract the filter (330) in the expanded state.

3. The oil fume filtering device according to claim 2, characterized in that: The retractable assembly (340) comprises a coil spring (343), the filter screen (330) is connected to the coil spring (343), the coil spring (343) is used to reel in and unreel the filter screen (330), and the coil spring (343) has a tendency to reel in so as to keep the filter screen (330) in the unfolded state taut.

4. The oil fume filtering device according to claim 3, characterized in that: The storage assembly (340) further comprises a storage shell (341), wherein the storage shell (341) is arranged on the outside of the first shell (310) or the second shell (320), the coil spring (343) is arranged in the storage shell (341), and the filter (330) passes through a storage opening (312) on the first shell (310) or the second shell (320).

5. The oil fume filtering device according to claim 2, characterized in that: The movement and adjustment component (350) comprises a push rod motor (351), and the push rod motor (351) is used to drive the first shell (310) and the second shell (320) to move closer to or farther from each other in the airflow conveying direction.

6. The oil fume filtering device according to claim 5, characterized in that: The movable adjustment assembly (350) further comprises a transmission member (352); the push rod motor (351) comprises a fixed portion and a push rod; the fixed portion of the push rod motor (351) is connected to one of the first shell (310) and the second shell (320); the transmission member (352) is connected to the other of the first shell (310) and the second shell (320) via 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 respectively located on opposite sides of the filter channel.

7. The oil fume filtering device according to claim 1, characterized in that: One end of the first shell (310) facing away from the air inlet (313) and one end of the second shell (320) facing away from the air outlet (322) are sleeved.

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

9. The range hood according to claim 8, characterized in that: The range hood further comprises a first oil fume concentration sensor, the first oil fume concentration sensor being used to detect the oil fume concentration upstream of the oil fume filtering device (300).

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

11. The range hood according to claim 10, characterized in that: The range hood further comprises an air outlet pipeline (260); the exhaust port (322) of the oil fume filtering device (300) is connected to the air outlet pipeline (260) via a flexible tube (261); an end of the air outlet pipeline (260) away from the oil fume filtering device (300) forms an outlet (270) of the range hood; and the second oil fume concentration sensor is arranged on the air outlet pipeline (260).

12. A range hood control method, characterized in that: Applicable to the range hood according to any one of claims 8 to 11, the range hood control method comprises: Obtain the oil smoke concentration at the target detection location; According to the oil smoke concentration at the target detection position, the adjustment mechanism is controlled to adjust the area of ​​the filter (330) in the deployed state.

13. The range hood control method according to claim 12, characterized in that: The target detection position comprises a first detection position upstream of the oil fume filtering device (300); and the step of controlling the adjustment mechanism to adjust the area of ​​the filter (330) in the deployed state according to the oil fume concentration at the target detection position comprises: Determining whether the oil smoke concentration at the first detection position is greater than a preset concentration value; When the oil smoke concentration at the first detection position is greater than the preset concentration value, the regulating 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 position also includes a second detection position downstream of the oil fume filtering device (300); and the step of controlling the adjustment mechanism to adjust the area of ​​the filter (330) in the deployed state according to the oil fume concentration at the target detection position further includes: When the oil smoke concentration at the first detection position is not greater than the preset concentration value, judging whether the filtration efficiency reaches the preset efficiency according to the oil smoke concentrations at the first detection position and the second detection position; When the filtering efficiency does not reach the preset efficiency, the regulating mechanism is controlled to increase the area of ​​the filter screen (330) in the expanded 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 deployed state according to the oil smoke concentration at the target detection position further includes: When the filtering efficiency reaches the preset efficiency, determining whether the pressure difference between the upstream and downstream of the oil fume filtering device (300) reaches a preset difference; When the pressure difference reaches the preset difference, the regulating mechanism is controlled to reduce the area of ​​the filter screen (330) in the expanded state.

Images