Lampblack filtering device and range hood

Abstract

The utility model discloses an oil fume filtering device and a range hood, and relates to the technical field of household appliances. The oil smoke filtering device comprises a first shell, a second shell, a filter screen, a retracting and releasing assembly and a movable adjusting assembly, the retracting and releasing assembly is used for releasing the filter screen in a folded state or retracting the filter screen in an unfolded state, and the movable adjusting assembly is used for adjusting the relative position of the first shell and the second shell in the airflow conveying direction. Therefore, the area of the filter screen in the unfolded state is adjusted. The movable adjusting assembly comprises an electromagnetic attraction part and an elastic part, the relative position of the first shell and the second shell can be effectively controlled through the electromagnetic attraction part and the elastic part, so that the area of the filter screen in the unfolded state is adjusted, the filter area can be adjusted according to actual requirements of different scenes, the filter effect and wind resistance are well balanced, and the filter efficiency is improved. Therefore, the user experience is improved. The range hood provided by the embodiment of the utility model comprises the oil fume filtering device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to an oil fume filtering device and an oil fume extractor. BACKGROUND

[0002] In the existing oil fume extractor, a purification filter screen is arranged to filter oil fume, thereby improving the cleanliness of air discharged from the oil fume extractor. With the same air duct size, the larger the area of the filter screen, the better the filtering effect; but the larger the area of the filter screen, the greater the air resistance generated, which will reduce the oil fume suction capacity of the oil fume extractor, possibly resulting in that oil fume in the kitchen cannot be completely sucked, and reducing the use experience of users in the kitchen. The filter screen of the oil fume extractor in the related art usually has a fixed purification area, and cannot be adjusted according to the current scene, and cannot well balance the air resistance and the filtering capacity in different scenes, and it is difficult to meet the use requirements in different scenes, and the use experience of users is not good. SUMMARY

[0003] The purpose of the present application includes providing an oil fume filtering device and an oil fume extractor, which can flexibly adjust the area of the filter screen, thereby meeting the use requirements in different scenes and improving the user experience.

[0004] Embodiments of the present application can be implemented as follows:

[0005] In a first aspect, the present application provides an oil fume filtering device, comprising a first shell, a second shell, a filter screen, a folding and unfolding assembly, and a moving adjustment assembly. The first shell and the second shell are arranged and communicated in the airflow conveying direction, and the first shell and the second shell jointly enclose a filtering channel. The first shell is provided with an air inlet communicated with the filtering channel, and the second shell is provided with an air outlet communicated with the filtering channel. The inner wall of the first shell is provided with at least one first rod body, and 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 located in the filtering channel for filtering airflow. A part of the filter screen can be accommodated in the folding and unfolding assembly to be in an accommodation state. The filter screen in the unfolded state is alternately arranged around the first rod body and the second rod body to be in a zigzag shape. The folding and unfolding assembly is used to release the filter screen in the accommodation state or to retract the filter screen in the unfolded state. The moving adjustment assembly is used to adjust the relative position of the first shell and the second shell in the airflow conveying direction to adjust the area of the filter screen in the unfolded state. The moving adjustment assembly comprises an electromagnetic attracting piece and an elastic piece. The electromagnetic attracting piece is used to provide a magnetic attraction force to make the first shell and the second shell close to each other in the airflow conveying direction. The elastic piece is used to provide an elastic force to make the first shell and the second shell away from each other in the airflow conveying direction.

[0006] In an optional embodiment, the mobile adjusting assembly comprises a plurality of electromagnetic suction members, the plurality of electromagnetic suction members comprising at least one first electromagnetic suction member and at least one second electromagnetic suction member, the first electromagnetic suction member being arranged on the first housing, the second electromagnetic suction member being arranged on the second housing, the first electromagnetic suction member and the second electromagnetic suction member corresponding to each other and capable of attracting each other.

[0007] In an optional embodiment, the first electromagnetic suction member is provided with a first fixing portion, the second electromagnetic suction member is provided with a second fixing portion, one end of the elastic member is connected to the first fixing portion, and the other end of the elastic member is connected to the second fixing portion.

[0008] In an optional embodiment, the elastic member comprises a compression spring.

[0009] In an optional embodiment, the oil fume filtering device further comprises a heating assembly, the heating assembly being configured to heat the filter screen.

[0010] In an optional embodiment, the heating assembly comprises an electric heating wire, the electric heating wire being arranged in the first rod body and / or the second rod body.

[0011] In an optional embodiment, the winding and unwinding assembly comprises a coil spring, one end of the filter screen is fixed relative to one of the first housing and the second housing, the other end of the filter screen is connected to the coil spring, the coil spring is configured to wind and unwind the filter screen, and the coil spring has a tendency to wind to keep the filter screen in a tensioned state.

[0012] In an optional embodiment, the winding and unwinding assembly further comprises a receiving housing, the receiving housing being arranged outside the first housing or the second housing, the coil spring being arranged in the receiving housing, and the filter screen passing through a receiving opening on the first housing or the second housing.

[0013] In an optional embodiment, one end of the first housing away from the air inlet and one end of the second housing away from the air outlet are sleeved.

[0014] In a second aspect, the application provides an oil fume extractor comprising the oil fume filtering device according to any one of the foregoing embodiments.

[0015] The oil fume filtering device and the oil fume extractor provided by the embodiments of the application have the following beneficial effects:

[0016] The oil fume filtering device provided by the embodiments of the present application comprises a first shell, a second shell, a filter screen, a folding and unfolding assembly and a moving adjustment assembly. The first shell and the second shell are arranged and communicated in the airflow conveying direction, and jointly enclose a filtering channel. The first shell is provided with an air inlet communicated with the filtering channel, and the second shell is provided with an air outlet communicated with the filtering channel. The inner wall of the first shell is provided with at least one first rod body, and 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 located in the filtering channel for filtering the airflow. A part of the filter screen can be accommodated in the folding and unfolding assembly to be in an accommodation state. The filter screen in the unfolded state is alternatively arranged around the first rod body and the second rod body to be in a zigzag shape. The folding and unfolding assembly is used to release the filter screen in the accommodation state or to retract the filter screen in the unfolded state. The moving adjustment assembly is used to adjust the relative positions of the first shell and the second shell in the airflow conveying direction to adjust the area of the filter screen in the unfolded state. The moving adjustment assembly comprises an electromagnetic attracting piece and an elastic piece. The electromagnetic attracting piece is used to provide a magnetic attraction force to make the first shell and the second shell close to each other in the airflow conveying direction. The elastic piece is used to provide an elastic force to make the first shell and the second shell move away from each other in the airflow conveying direction. In the embodiments of the present application, 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, so that the filtering area can be adjusted according to the actual needs of different scenes, and the filtering effect and the wind resistance are well balanced, thereby improving the user experience. Specifically, the magnetic attraction force of the electromagnetic attracting piece can be changed by adjusting the current of the electromagnetic attracting piece. When the magnetic attraction force increases, the first shell and the second shell overcome the elastic force of the elastic piece and move close to each other, and the area of the filter screen in the unfolded state decreases. Conversely, when the magnetic attraction force decreases, the first shell and the second shell move away from each other under the action of the elastic force of the elastic piece, and the area of the filter screen in the unfolded state increases. Therefore, the relative positions of the first shell and the second shell can be effectively controlled by the electromagnetic attracting piece and the elastic piece, so as to adjust the area of the filter screen in the unfolded state.

[0017] The oil fume filtering device provided by the embodiments of the present application comprises a first shell, a second shell, a filter screen, a folding and unfolding assembly and a moving adjustment assembly. The first shell and the second shell are arranged and communicated in the airflow conveying direction, and jointly enclose a filtering channel. The first shell is provided with an air inlet communicated with the filtering channel, and the second shell is provided with an air outlet communicated with the filtering channel. The inner wall of the first shell is provided with at least one first rod body, and 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 located in the filtering channel for filtering the airflow. A part of the filter screen can be accommodated in the folding and unfolding assembly to be in an accommodation state. The filter screen in the unfolded state is alternatively arranged around the first rod body and the second rod body to be in a zigzag shape. The folding and unfolding assembly is used to release the filter screen in the accommodation state or to retract the filter screen in the unfolded state. The moving adjustment assembly is used to adjust the relative positions of the first shell and the second shell in the airflow conveying direction to adjust the area of the filter screen in the unfolded state. The moving adjustment assembly comprises an electromagnetic attracting piece and an elastic piece. The electromagnetic attracting piece is used to provide a magnetic attraction force to make the first shell and the second shell close to each other in the airflow conveying direction. The elastic piece is used to provide an elastic force to make the first shell and the second shell move away from each other in the airflow conveying direction. In the embodiments of the present application, 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, so that the filtering area can be adjusted according to the actual needs of different scenes, and the filtering effect and the wind resistance are well balanced, thereby improving the user experience. Specifically, the magnetic attraction force of the electromagnetic attracting piece can be changed by adjusting the current of the electromagnetic attracting piece. When the magnetic attraction force increases, the first shell and the second shell overcome the elastic force of the elastic piece and move close to each other, and the area of the filter screen in the unfolded state decreases. Conversely, when the magnetic attraction force decreases, the first shell and the second shell move away from each other under the action of the elastic force of the elastic piece, and the area of the filter screen in the unfolded state increases. Therefore, the relative positions of the first shell and the second shell can be effectively controlled by the electromagnetic attracting piece and the elastic piece, so as to adjust the area of the filter screen in the unfolded state. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0019] Figure 1 A schematic diagram of an oil fume machine in an embodiment of the present application;

[0020] Figure 2 FIG. 1 is a schematic view of an oil fume filtering device according to an embodiment of the present application;

[0021] Figure 3 FIG. 2 is an exploded view of the oil fume filtering device according to the embodiment of the present application;

[0022] Figure 4 FIG. 3 is a sectional view of the oil fume filtering device according to the embodiment of the present application when the first shell and the second shell are in different relative positions. Figure 5

[0023] Legend: 001 - pot; 100 - table; 110 - stove; 120 - smoke inlet; 121 - smoke inlet grille; 200 - cabinet; 210 - oil screen; 220 - oil cup; 230 - flow guide; 240 - fan; 241 - exhaust pipe; 242 - first detection assembly; 251 - diffuser cover; 252 - converging cover; 260 - air outlet pipeline; 261 - flexible pipe; 262 - second detection assembly; 270 - outlet; 271 - outlet grille; 280 - control assembly; 300 - oil fume filtering device; 310 - first shell; 311 - first rod; 312 - receiving opening; 313 - air inlet; 320 - second shell; 321 - second rod; 322 - air outlet; 330 - filter screen; 340 - folding assembly; 341 - receiving housing; 342 - coil spring; 350 - movement adjustment assembly; 351 - first electromagnetic attraction member; 352 - second electromagnetic attraction member; 353 - elastic member; 354 - first fixed portion; 355 - second fixed portion. DETAILED DESCRIPTION

[0024] The filtering area of the filter screen in the oil fume extractor in the related art is fixed, which makes it difficult for the oil fume extractor to meet different use requirements in different scenarios. For example, when the amount of oil fume is large during cooking, which seriously affects the user experience, the main task of the oil fume extractor is to improve the oil fume extraction effect, and the filtering efficiency of the oil fume filtering device should be secondary. In order to ensure the filtering effect, the filter screen in the related art is provided with a fixed area, which will cause large air resistance when the air volume needs to be increased, which is not conducive to the improvement of the oil fume extraction effect. When the air volume of the oil fume extractor can meet the oil fume extraction effect, the oil fume extractor is required to have better filtering capacity to improve the purification effect of the oil fume extractor, but the existing oil fume extractor cannot adjust the filter screen.

[0025] Therefore, the embodiments of the present application provide an oil fume filtering device and an oil fume extractor, the filtering area of the filter screen of which is adjustable, so that it can meet the use requirements in different scenarios.

[0026] ​In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0027] 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 claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work under the premise that the scope of the claimed present application.

[0028] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0029] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the utility model product is usually placed, only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0030] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0032] Figure 1 A schematic view of a range hood in one embodiment of the present application. As shown in Figure 1As shown, the range hood provided by the embodiment of the present application is an island table integrated machine, which comprises a table 100, a cabinet 200 arranged below the table 100, a fan 240 and an oil fume filtering device 300. The fan 240 and the oil fume filtering device 300 are arranged in the cabinet 200. The range hood has an oil fume inlet 120 and an outlet 270. In the embodiment, the oil fume inlet 120 is arranged on the table 100. In the direction of air flow, the oil fume inlet 120, the fan 240, the oil fume filtering device 300 and the outlet 270 are sequentially communicated to form an air duct of the range hood. The table 100 is provided with a cooking appliance 110, and a user can place a pot 001 on the cooking appliance 110 for heating. The fan 240 is used to provide power for air flow. In the embodiment, the fan 240 is arranged upstream of the oil fume filtering device 300 in the direction of air flow. In other embodiments, the fan 240 can also be arranged downstream of the oil fume filtering device 300.

[0033] In the embodiment, the range hood is introduced as an island table integrated machine. It should be understood that in other optional embodiments, the range hood can also be other types, such as a top suction type range hood. The following describes each component of the range hood in the direction of air flow.

[0034] In the embodiment, the oil fume inlet 120 is provided with an oil fume inlet grille 121, which is used to block objects on the table 100 to prevent them from falling into the air duct. An oil screen 210 is arranged below the oil fume inlet grille 121. The oil screen 210 can attach a part of oil fume particles in the air flow to play a certain filtering role. An oil cup 220 is arranged below the oil screen 210. The oil cup 220 can catch and temporarily store oil droplets falling from the oil screen 210. The oil cup 220 is arranged to be detachable, which can facilitate the user to detach and clean. A flow guide part 230 is arranged in the cabinet 200. The flow guide part 230 forms part of the side wall of the air duct. The flow guide part 230 is used to guide the air flow after passing through the oil screen 210 to the air inlet side of the fan 240.

[0035] In the embodiment, the fan 240 is a centrifugal fan, which has the characteristics of axial air inlet and radial air outlet. In other optional embodiments, the fan 240 can also adopt other types, such as an axial flow fan, a cross flow fan, etc.

[0036] The exhaust side of the fan 240 is communicated with the air inlet 313 of the oil fume filtering device 300. In the embodiment, the exhaust side of the fan 240 has an exhaust pipe 241, one end of which is connected with the volute of the fan 240, and the other end of which is communicated with 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 with the air inlet 313 of the oil fume filtering device 300 through an expansion cover 251. In the embodiment, the exhaust pipe 241 of the fan 240 is further provided with a first detection assembly 242, which can detect the state of the airflow. Optionally, the first detection assembly 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.

[0037] Figure 2 A schematic view of the oil fume filtering device 300 in an embodiment of the present application; Figure 3 An exploded view of the oil fume filtering device 300 in an embodiment of the present application. As shown in Figure 2 and Figure 3 , the oil fume filtering device 300 in the embodiment of the present application includes a first shell 310, a second shell 320, a filter screen 330, a folding and unfolding assembly 340, and a moving and adjusting assembly 350. The first shell 310 and the second shell 320 are arranged and communicated in the airflow conveying direction, and jointly enclose a filtering channel. The first shell 310 is provided with an air inlet 313 (see Figure 4 、 Figure 5 ) communicated with the filtering channel, and the second shell 320 is provided with an air outlet 322 communicated with the filtering channel. The air inlet 313 and the air outlet 322 are respectively located at opposite ends of the oil fume filtering device 300. 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 screen 330 is in an unfolded state and located in the filtering channel for filtering the airflow. The filter screen 330 in the unfolded state is alternatively arranged around the first rod body 311 and the second rod body 321 to present a zigzag shape. An adjusting 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 screen 330 in the unfolded state. The folding and unfolding assembly 340 is used to release the filter screen 330 in the folded state or to fold back the filter screen 330 in the unfolded state. The moving and adjusting assembly 350 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 screen 330 in the unfolded state.

[0038] In the embodiment, the filter screen 330 is woven from a high-temperature-resistant flexible material, such as a carbon fiber felt material or the like. The first rod body 311 and the second rod body 321 can be cylindrical or prismatic.

[0039] Figure 4 And Figure 5 is a sectional view of the oil fume filtering device 300 in the embodiment of the present application when the first shell 310 and the second shell 320 are in different relative positions. In combination with Figures 2 to 5 , in the embodiment, the end of the first shell 310 away from the air inlet 313 is sleeved with the end of the second shell 320 away from the air outlet 322, so that the first shell 310 and the second shell 320 can move relative to each other in the airflow conveying direction, while ensuring that the connection position has better air tightness, avoiding the smoke from flowing out of the filtering channel between the first shell 310 and the second shell 320. In the embodiment, the first shell 310 is sleeved on the outside of the second shell 320. In addition to the sleeving mode of active connection, a flexible member can also be used for connection, so that the relative movement of the first shell 310 and the second shell 320 and the air tightness of the connection position can also be ensured. In Figure 4 and Figure 5 , the airflow conveying direction is from left to right.

[0040] In the embodiment, a plurality of first rod bodies 311 are arranged in the first shell 310, the plurality of first rod bodies 311 are arranged in parallel and at intervals, and are arranged perpendicular to the airflow conveying direction; a plurality of second rod bodies 321 are arranged in the second shell 320, the plurality of second rod bodies 321 are arranged in parallel and at intervals, and are arranged perpendicular to the airflow conveying direction, and the second rod bodies 321 are parallel to the first rod bodies 311. In the embodiment, the filter screen 330 in the unfolded state is alternately arranged around the plurality of first rod bodies 311 and the plurality of second rod bodies 321 to form a zigzag shape. When the first shell 310 and the second shell 320 move close to each other, the spacing of the first rod bodies 311 and the second rod bodies 321 in the airflow conveying direction becomes smaller (such as L1 in Figure 4 ), and the area of the filter screen 330 in the unfolded state becomes smaller. At this time, the filtering effect of the filter screen 330 is weakened, and the wind resistance becomes smaller. When the first shell 310 and the second shell 320 move away from each other, the spacing of the first rod bodies 311 and the second rod bodies 321 in the airflow conveying direction becomes larger (such as L2 in Figure 5 ), and the area of the filter screen 330 in the unfolded state becomes larger. At this time, the filtering effect of the filter screen 330 is enhanced, and the wind resistance becomes larger.

[0041] In the embodiment, one end of the filter screen 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 assembly 340. In the embodiment, one end of the filter screen 330 is fixed relative to the first shell 310, for example, fixedly connected to the first rod body 311 farthest from the retractable assembly 340 in the row of first rod bodies 311 (i.e., the lowermost first rod body 311 in the figure), or fixedly connected to the inner wall of the first shell 310. When the first shell 310 and the second shell 320 move closer to or farther from each other, the filter screen 330 can slide on the first rod body 311 and the second rod body 321.

[0042] In the embodiment, the movement adjusting assembly 350 includes an electromagnetic suction member for providing a magnetic attraction force for moving the first shell 310 and the second shell 320 closer to each other in the airflow conveying direction, and an elastic member 353 for providing an elastic force for moving the first shell 310 and the second shell 320 farther away from each other in the airflow conveying direction. It can be understood that the magnetic attraction force of the electromagnetic suction member can be changed by adjusting the current of the electromagnetic suction member. When the magnetic attraction force increases, the first shell 310 and the second shell 320 move closer to each other against the elastic force of the elastic member 353, and the area of the filter screen 330 in the unfolded state decreases. Conversely, when the magnetic attraction force decreases, the first shell 310 and the second shell 320 move farther away from each other under the elastic force of the elastic member 353, and the area of the filter screen 330 in the unfolded state increases. Therefore, the relative positions of the first shell 310 and the second shell 320 can be effectively controlled by the electromagnetic suction member and the elastic member 353, so as to achieve stepless adjustment of the area of the filter screen 330 in the unfolded state. Moreover, the relative positions of the first shell 310 and the second shell 320 are adjusted by the magnetic attraction force of the electromagnetic suction member, which has the advantage of small noise compared with using a mechanical transmission structure.

[0043] In the embodiment, the movement adjusting assembly 350 includes a plurality of electromagnetic suction members, including at least one first electromagnetic suction member 351 and at least one second electromagnetic suction member 352. The first electromagnetic suction member 351 is arranged on the first shell 310, the second electromagnetic suction member 352 is arranged on the second shell 320, and the first electromagnetic suction member 351 and the second electromagnetic suction member 352 correspond to each other and can attract each other. In other embodiments, an electromagnetic suction member can be arranged on one of the first shell 310 and the second shell 320, and a magnetic suction part such as an iron block can be arranged on the other.

[0044] In the embodiment, a plurality of first electromagnetic suction members 351 are arranged on the opposite two outer sides of the first shell 310 respectively, and the first electromagnetic suction members 351 on the two sides are symmetrically arranged; correspondingly, a plurality of second electromagnetic suction members 352 are arranged on the opposite two outer sides of the second shell 320 respectively, and the second electromagnetic suction members 352 on the two sides are symmetrically arranged. Specifically, three first electromagnetic suction members 351 are arranged on the opposite two sides of the first shell 310 respectively, and three second electromagnetic suction members 352 are arranged on the opposite two sides of the second shell 320 respectively.

[0045] Further, the first electromagnetic suction member 351 is provided with a first fixing portion 354, the second electromagnetic suction member 352 is provided with a second fixing portion 355, one end of the elastic member 353 is connected to the first fixing portion 354, and the other end is connected to the second fixing portion 355.

[0046] In the embodiment, the elastic member 353 includes a compression spring. It should be understood that in other embodiments, the elastic member 353 can also be other structures with elasticity, such as a leaf spring, a torsion spring, etc. The arrangement positions of the electromagnetic suction members and the elastic member 353 can be adjusted as needed, for example, the first electromagnetic suction member 351, the second electromagnetic suction member 352 and the elastic member 353 can be arranged inside the first shell 310 and the second shell 320.

[0047] Further, the retractable assembly 340 in the embodiment is arranged on the outer side of the first shell 310 or the second shell 320. The retractable assembly 340 includes a receiving shell 341 and a winding spring 342, the receiving shell 341 is arranged on the outer side of the first shell 310 or the second shell 320, and the winding spring 342 is arranged in the receiving shell 341. One end of the filter screen 330 is connected to the winding spring 342, and the filter screen 330 passes through the receiving opening 312 on the first shell 310 or the second shell 320. The winding spring 342 is used to wind and unwind the filter screen 330, and the winding spring 342 has a tendency to wind to keep the filter screen 330 in a tensioned state. Specifically, in the embodiment, the retractable assembly 340 is arranged on the first shell 310, the receiving shell 341 is fixedly connected to the outer side of the first shell 310, and the receiving opening 312 is arranged on the top of the first shell 310. The winding spring 342 can drive without relying on a motor, that is, the receiving and tensioning of the filter screen 330 can be realized.

[0048] In the embodiment, the oil fume filtering device 300 can further include a heating assembly (not shown in the figure), which can heat the filter screen 330 to melt the grease and other substances on the filter screen 330, so as to realize the cleaning of the filter screen 330. The heating assembly can keep the filtering efficiency of the filter screen 330 in a good state, and the filter screen 330 does not need to be removed and cleaned regularly, thereby improving the convenience of use of the range hood.

[0049] Specifically, the heating assembly can include an electric heating wire, which is arranged 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 electric heating wire can be made of a metal material with a high thermal conductivity, such as copper. By arranging the electric heating wire in the first rod body 311 and / or the second rod body 321, the space occupation of the heating assembly can be effectively reduced, and the first rod body 311 and the second rod body 321 are in close contact with the filter screen 330, which can well transfer heat. In other embodiments, the heating assembly can also be fixed on the inner wall of the first housing 310 and / or the second housing 320, and mainly heat the filter screen 330 through heat radiation.

[0050] Please continue to refer to Figure 1 In the embodiment, the range hood further includes an air outlet pipeline 260, the exhaust port 322 of the oil fume filtering device 300 is communicated with the air outlet pipeline 260 through a flexible pipe 261, and an end of the air outlet pipeline 260 away from the oil fume filtering device 300 forms an outlet 270 of the range hood. Specifically, the first housing 310 of the oil fume filtering device 300 is fixed relative to the cabinet 200, and 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 the embodiment, since the caliber of the exhaust port 322 of the second housing 320 is larger than the pipe diameter of the flexible pipe 261, the exhaust port 322 of the second housing 320 is communicated with the flexible pipe 261 through a contraction cover 252. An outlet grille 271 is arranged at the outlet 270, which is used to prevent foreign matters from entering the air duct.

[0051] In the embodiment, the range hood further includes a second detection assembly 262, which is used to detect the airflow state downstream of the oil fume filtering device 300. Optionally, the second detection assembly 262 includes a second oil fume concentration sensor arranged in the air outlet pipeline 260, which is used to detect the oil fume concentration downstream of the oil fume filtering device 300. The detected oil fume concentration can be used to evaluate the quality of the gas filtered by the oil fume filtering device 300. Moreover, the oil fume concentrations upstream and downstream of the oil fume filtering device 300 can be used to evaluate the filtering effect of the oil fume filtering device 300. Further, the second detection assembly 262 can further include a second flow rate sensor used to detect the airflow flow rate. The airflow flow rate can represent the current air volume of the range hood.

[0052] In the embodiment, the range hood further comprises a control assembly 280, which is arranged in the cabinet 200. The first detection assembly 242, the second detection assembly 262, the fan 240, and the moving adjustment assembly 350 (specifically, the electromagnetic suction member) of the oil fume filtering device 300 are electrically connected with the control assembly 280, so that the control assembly 280 can be fed with the collected signals or receive the instructions of the control assembly 280 to perform corresponding actions. In a specific embodiment, when the first oil fume concentration sensor in the first detection assembly 242 detects that the oil fume concentration exceeds the preset value, the control assembly 280 controls the moving adjustment assembly 350 to reduce the expansion area of the filter screen 330, so as to reduce the wind resistance of the filter screen 330 and improve the oil fume suction capacity; when it is judged through the detection signals of the first oil fume concentration sensor and the second oil fume concentration sensor that the filtering efficiency is low, the control assembly 280 controls the moving adjustment assembly 350 to increase the expansion area of the filter screen 330, so as to improve the filtering effect.

[0053] The oil fume filtering device 300 and the range hood according to the embodiments of the present application can adjust the area of the filter screen 330 in the expanded state, i.e., adjust the filtering area of the filter screen 330, to balance the filtering capacity and the oil fume suction capacity, so that different scenes can be flexibly adapted. When the oil fume concentration is high, the oil fume suction capacity of the range hood is mainly improved, so the expansion area of the filter screen 330 can be reduced; when the oil fume concentration is small and the suction force is sufficient to meet the oil fume suction, the expansion area of the filter screen 330 can be appropriately increased to improve the filtering effect.

[0054] In summary, the oil fume filtering device 300 and the range hood are provided in the embodiments of the present application. The oil fume filtering device 300 comprises a first shell 310, a second shell 320, a filter screen 330, a folding and unfolding assembly 340, and a moving adjustment assembly 350. The first shell 310 and the second shell 320 are arranged and communicated in the airflow conveying direction, and jointly enclose a filtering channel. The first shell 310 is provided with an air inlet 313 communicated with the filtering channel, and the second shell 320 is provided with an air outlet 322 communicated with the filtering 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 screen 330 is in an unfolded state and located in the filtering channel for filtering the airflow. A part of the filter screen 330 can be accommodated in the folding and unfolding assembly 340 to be in an accommodation state. The filter screen 330 in the unfolded state is alternately arranged around the first rod body 311 and the second rod body 321 to be in a zigzag shape. The folding and unfolding assembly 340 is used to release the filter screen 330 in the accommodation state or to retract the filter screen 330 in the unfolded state. The moving adjustment assembly 350 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 screen 330 in the unfolded state. The moving adjustment assembly 350 comprises an electromagnetic attracting piece and an elastic piece 353. The electromagnetic attracting piece is used to provide a magnetic attraction force for moving the first shell 310 and the second shell 320 towards each other in the airflow conveying direction. The elastic piece 353 is used to provide an elastic force for moving the first shell 310 and the second shell 320 away from each other in the airflow conveying direction. In the embodiments of the present application, the first shell 310 and the second shell 320 can move relative to each other to adjust the area of the filter screen 330 in the unfolded state. Therefore, the filtering area can be adjusted according to the actual needs of different scenes, and the filtering effect and the wind resistance are well balanced, so as to improve the user experience. Specifically, the magnetic attraction force of the electromagnetic attracting piece can be changed by adjusting the current of the electromagnetic attracting piece. When the magnetic attraction force increases, the first shell 310 and the second shell 320 move towards each other against the elastic force of the elastic piece 353, and the area of the filter screen 330 in the unfolded state decreases. Conversely, when the magnetic attraction force decreases, the first shell 310 and the second shell 320 move away from each other under the action of the elastic force of the elastic piece 353, and the area of the filter screen 330 in the unfolded state increases. Therefore, the relative position of the first shell 310 and the second shell 320 can be effectively controlled by the electromagnetic attracting piece and the elastic piece 353, so as to adjust the area of the filter screen 330 in the unfolded state.

[0055] The range hood provided in the embodiments of the present application comprises the oil fume filtering device 300 described above, and therefore has the advantages of high flexibility and strong applicability to different scenes.

[0056] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. An oil fume filtering device, characterized in that, The oil fume filtering device (300) comprises a first shell (310), a second shell (320), a filter screen (330), a folding and unfolding assembly (340) and a movement adjusting assembly (350), the first shell (310) and the second shell (320) are arranged in a gas conveying direction and are communicated, the first shell (310) and the second shell (320) jointly enclose a filtering channel, the first shell (310) is provided with an air inlet (313) communicated with the filtering channel, the second shell (320) is provided with an air outlet (322) communicated with the filtering channel, an inner wall of the first shell (310) is provided with at least one first rod body (311), an inner wall of the second shell (320) is provided with at least one second rod body (321), at least a part of the filter screen (330) is in an unfolded state and is located in the filtering channel for filtering gas flow, a part of the filter screen (330) can be accommodated in the folding and unfolding assembly (340) to be in an accommodation state, the filter screen (330) in the unfolded state is alternately arranged around the first rod body (311) and the second rod body (321) to be in a zigzag shape; the folding and unfolding assembly (340) is used for releasing the filter screen (330) in the accommodation state or retracting the filter screen (330) in the unfolded state, the movement adjusting assembly (350) is used for adjusting the relative positions of the first shell (310) and the second shell (320) in the gas conveying direction, so as to adjust the area of the filter screen (330) in the unfolded state, the movement adjusting assembly (350) comprises an electromagnetic attracting piece and an elastic piece (353), the electromagnetic attracting piece is used for providing a magnetic attraction force for making the first shell (310) and the second shell (320) close to each other in the gas conveying direction, and the elastic piece (353) is used for providing an elastic force for making the first shell (310) and the second shell (320) away from each other in the gas conveying direction.

2. The oil fume filtering device according to claim 1, characterized in that, The movement adjusting assembly (350) comprises a plurality of electromagnetic attracting pieces, the plurality of electromagnetic attracting pieces comprise at least one first electromagnetic attracting piece (351) and at least one second electromagnetic attracting piece (352), the first electromagnetic attracting piece (351) is arranged on the first shell (310), the second electromagnetic attracting piece (352) is arranged on the second shell (320), the first electromagnetic attracting piece (351) and the second electromagnetic attracting piece (352) correspond to each other and can attract each other.

3. The oil fume filtering device according to claim 2, characterized in that, The first electromagnetic attracting piece (351) is provided with a first fixing portion (354), the second electromagnetic attracting piece (352) is provided with a second fixing portion (355), one end of the elastic piece (353) is connected to the first fixing portion (354), and the other end is connected to the second fixing portion (355).

4. The oil smoke filtering device according to claim 1, wherein, The elastic piece (353) comprises a compression spring.

5. The oil smoke filtering device according to claim 1, wherein, The oil fume filtering device (300) further comprises a heating assembly, and the heating assembly is used for heating the filter screen (330).

6. The oil fume filtering device according to claim 5, characterized in that, The heating assembly comprises an electric heating wire arranged in the first rod (311) and / or the second rod (321).

7. The oil fume filtering device according to any one of claims 1-6, characterized in that, The winding and unwinding assembly (340) comprises a coiled spring (342), one end of the filter screen (330) is fixed relative to one of the first shell (310) and the second shell (320), and the other end is connected to the coiled spring (342), the coiled spring (342) is used for winding and unwinding the filter screen (330), and the coiled spring (342) has a tendency to wind up to keep the filter screen (330) in tension in the unfolded state.

8. The oil fume filtering device according to claim 7, characterized in that, The winding and unwinding assembly (340) further comprises a receiving housing (341) arranged outside the first shell (310) or the second shell (320), the coiled spring (342) is arranged in the receiving housing (341), and the filter screen (330) passes through the receiving opening (312) on the first shell (310) or the second shell (320).

9. The oil fume filtering device according to any one of claims 1-6, characterized in that, The first shell (310) is sleeved with the second shell (320) at one end away from the air inlet (313) and at one end away from the air outlet (322).

10. A range hood characterized by The oil fume filtering device (300) according to any one of claims 1-9 is provided.

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