A cooking and roasting device with filtering function

Abstract

This invention relates to the field of grilling and cooking equipment, and in particular to a grilling device with a filtration function, comprising a grill and a filter box disposed on one side of the grill's exhaust end. The filter box has an air inlet and an air outlet. The air inlet is connected to the exhaust end of the grill, and the air outlet is staggered from the air inlet in the horizontal and / or vertical directions, allowing the gas to flow along a non-linear path before being discharged. The fan is located at the bend of the non-linear path. The filter box consists of a suction shell and a fan housing. The inner wall of the suction shell has an arc-shaped guide wall, and the fan housing has an arc-shaped guide groove, which together form an S-shaped airflow channel. A filter element is installed between the suction shell and the fan housing. This invention filters through the filter element and utilizes the arc-shaped guide wall to direct the exhaust outwards, expelling the filtered water vapor and heat from the machine body, reducing the temperature rise and humidity of the machine body. Furthermore, oil fumes can be condensed and solidified on the filter element, preventing them from adsorbing inside the fan and the machine housing, effectively filtering the oil stains produced during grilling.

Description

Technical Field

[0001] This invention relates to the field of frying and grilling cooking equipment technology, and in particular to a frying and grilling device with a filtering function. Background Technology

[0002] Existing grills mainly consist of a grilling unit, heating elements, and an exhaust system. During cooking, the fumes generated by the heated food are guided by the exhaust system and discharged outside the machine. To address the pollution of the kitchen environment by cooking fumes, some grills have added a smoke-absorbing filter module inside or on one side. For example, CN218246922U discloses a fume-absorbing grilling device where fumes generated by the heating element are drawn into the duct through the air inlet by a fan, filtered by the filter assembly, and discharged from the air outlet. In this solution, the duct is located inside the grill, and the fumes are guided out through it. This solution reduces air pollution caused by direct exhaust of fumes to some extent. However, the exhaust structure of this existing grill still has insurmountable technical defects in practical use.

[0003] The exhaust path passes through the inside of the grill. The exhaust vents of existing grills are mostly located inside the machine or close to the machine body. The oil fumes carrying high temperature moisture and heat need to flow through the internal channels of the grill before being discharged. The high temperature and high humidity gas will continuously transfer heat and moisture to various parts of the machine body during the process.

[0004] Secondly, oil easily enters the fan area, causing the fan performance to deteriorate rapidly. In the existing smoke filtration structure of grills, the fan is often directly placed in the middle of the oil fume flow path. When the oily airflow enters the fan, the oil particles in the oil fume directly collide with and adhere to the fan impeller and motor surface. Summary of the Invention

[0005] In view of the problems in the above or existing technologies, such as the need for oil fumes to flow through the internal channels of the grill before being discharged and the easy entry of grease into the fan area, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a grilling device with a filtering function.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] A grilling device with filtration function includes a grill and a filter box. The grill has an exhaust end, and the filter box is disposed on one side of the exhaust end. The filter box has an air inlet, an air outlet, and a fan body. The air inlet is connected to the exhaust end, and the air outlet is disposed on the filter box and is staggered from the air inlet in the horizontal and / or vertical directions, so that the gas entering from the air inlet flows along a non-linear path in the filter box and is discharged from the air outlet. The fan body is disposed in the filter box, located at the bend of the non-linear path, and is used to provide the driving force for the gas flow.

[0009] As a preferred embodiment of the grilling device with filtration function of the present invention, the nonlinear path is "S" shaped, and the air inlet, air outlet and fan body are connected sequentially along the airflow direction to form an "S" shaped air duct.

[0010] As a preferred embodiment of the grilling device with filtration function of the present invention, the filter box is composed of a suction shell and a fan shell. The suction shell and the fan shell are both hollow and connected at the connection. The inner wall of the suction shell on the side away from the air inlet is an arc-shaped guide wall, which guides the gas to the fan shell.

[0011] As a preferred embodiment of the grilling device with filtration function of the present invention, a filter element is also installed between the suction shell and the fan shell, and the filter element covers the entire inlet end of the fan shell to filter the flowing oil and gas.

[0012] As a preferred embodiment of the grilling device with filtration function of the present invention, wherein: the suction shell and the fan shell are detachably connected by snaps or magnetic attraction, and the filter element is clamped and fixed between the lower opening of the suction shell and the upper opening of the fan shell; when the suction shell is separated from the fan shell, the filter element is exposed to the outside for removal, replacement or cleaning.

[0013] As a preferred embodiment of the grilling device with filtering function of the present invention, wherein: an arc-shaped guide groove for guiding the gas flow is fixedly connected to the inner surface of the fan housing, one end of the highest point of the arc-shaped guide groove is fixedly connected to the inner wall of the fan housing, and the other end of the arc-shaped guide groove extends toward the air outlet and is fixedly connected to the fan housing.

[0014] As a preferred embodiment of the grilling device with filtering function of the present invention, wherein: the distance between the centerline of the fan body and the inner wall of the fan housing adjacent to the air outlet is L1; the distance between the centerline of the fan body and the inner wall of the fan housing on the other side is L2; ​​and L1 > L2.

[0015] As a preferred embodiment of the grilling device with filtration function of the present invention, the bottom of the filter box also includes a shell bottom cover.

[0016] As a preferred embodiment of the grilling device with filtering function of the present invention, it further includes: an air intake component installed inside the suction shell; the air intake component includes: inner sliders symmetrically distributed on both sides inside the suction shell, the inner sliders being able to move inside the suction shell to partially block the flow section of the air inlet; hinge seats installed on each of the inner sliders, and multiple outer frames that are sequentially hinged to each other are hinged between the two hinge seats, each of the outer frames rotating relative to each other at the hinge point after being pressed by the inner sliders on both sides, forming a sawtooth arrangement, and a filter layer is provided on the inner surface of the outer frame.

[0017] As a preferred embodiment of the grilling device with filtering function of the present invention, the number of the outer frames is odd, two adjacent outer frames are hinged to each other by hinges, and the hinges are alternately arranged on different sides of two adjacent outer frames.

[0018] As a preferred embodiment of the grilling device with filtering function of the present invention, wherein: an expansion block is fixedly connected between the inner slider and the inner wall of the suction shell, the expansion block is inflated by a micro air pump installed on the inner slider, and a disc is rotatably connected to both sides of each outer frame, and the discs on the same side are connected in sequence by elastic ropes, and each outer frame is pulled to retract.

[0019] The beneficial effects of the grilling device with filtration function of the present invention are as follows: In this application, the arc-shaped guide wall and the arc-shaped guide groove are combined to form a complete S-shaped airflow channel. The airflow passes through two arc bends in opposite directions, and the flow path is smooth and continuous. When the oil fumes flow through the arc-shaped wall, the grease slides down. When the filter element is not replaced in time, causing the buffered oil to overflow, the sliding oil moves away from the fan. At the same time, the arc-shaped guide wall and the arc-shaped guide groove are combined to form a complete S-shaped airflow channel. The airflow passes through two arc bends in opposite directions but with a large radius of curvature, and the flow path is smooth and continuous. Compared to conventional U-shaped air ducts where airflow requires a sharp 180° turn and results in significant local resistance loss, the S-shaped air duct of this invention effectively reduces flow resistance, increases airflow with the same fan power, and significantly improves smoke extraction efficiency. Furthermore, the air outlet is positioned outwards from the grill, directly expelling all moisture and heat to the external environment. In contrast, conventional grills' exhaust vents allow gas to pass through the interior of the grill before being expelled. During this process, the high-temperature and high-humidity gas transfers heat and moisture to various components of the machine, leading to increased internal temperature and accelerated aging of electronic components. This invention, by positioning the exhaust vent outwards, effectively reduces the temperature rise and internal humidity of the grill body, protecting the internal electronic components and mechanical parts, and significantly extending the overall service life of the machine. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the installation structure of the present invention;

[0021] Figure 2 This is an exploded view of the internal structure of the filter box of the present invention;

[0022] Figure 3 This is a cross-sectional view of the internal structure of the filter box of the present invention;

[0023] Figure 4 This is a cross-sectional schematic diagram of the suction housing and filter box of the present invention;

[0024] Figure 5 This is a schematic diagram of the intake assembly and expansion block structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the inner slider and outer frame structure of the present invention;

[0026] Figure 7 This is a diagram showing the working state of the outer frame and hinges of the present invention;

[0027] Figure 8 This is a diagram showing the working state of the inner slider and the expansion block of the present invention;

[0028] Figure 9 This is a diagram showing the working state of the air intake assembly of the present invention.

[0029] In the diagram: 1. Grill; 2. Filter box; 21. Air inlet; 22. Air outlet; 23. Fan body; 241. Suction shell; 2411. Arc-shaped guide wall; 242. Fan housing; 2421. Arc-shaped guide groove; 2422. Bottom cover of housing; 25. Filter element; 3. Air intake assembly; 31. Inner slider; 311. Expansion block; 312. Miniature air pump; 32. Hinge seat; 33. Outer frame; 331. Hinge; 332. Disc; 333. Elastic rope; 34. Filter layer. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0032] Reference Figures 1-9This embodiment provides a grilling device with a filtration function, which can effectively filter and prevent moisture from entering the grill 1. It includes a grill 1 and a filter box 2. The grill 1 has an exhaust end, and the filter box 2 is located on one side of the exhaust end. The grill 1 is a conventional grilling and cooking device, which contains a heating element and a cooking cavity. Oil fumes generated during cooking escape from the exhaust end. The filter box 2 is used to filter and purify the oil fumes generated by the grill 1 before discharging them.

[0033] Reference Figure 1 and Figure 2 The filter box 2 has an air inlet 21, an air outlet 22, and a fan body 23. The air inlet 21 is connected to the exhaust end.

[0034] It should be noted that the spatial misalignment of the air inlet 21 and the air outlet 22 means that the geometric center axis of the air inlet 21 and the geometric center axis of the air outlet 22 do not coincide, and there is an offset between them in the horizontal or vertical direction. This misalignment makes it difficult for the airflow to flow directly from the air inlet 21 to the air outlet 22 along a straight path inside the filter box 2. Instead, it must flow along a curved, non-linear path, thus prolonging the residence time of oil fumes inside the filter box 2 and increasing the chances of oil mist particles colliding with the wall and condensing and settling.

[0035] The fan body 23 is installed inside the filter box 2, located at the bend of the nonlinear path, and is used to provide the driving force for gas flow. When the fan body 23 is running, the impeller rotates at high speed to generate negative pressure, which draws the oil fumes from the exhaust end of the grill 1 into the filter box 2 through the air inlet 21, and then pressurizes them before discharging them through the air outlet 22.

[0036] When in use, the grill 1 starts cooking, and the fumes generated by the heated food escape from the exhaust end. The fan body 23 starts running, creating negative pressure at the air inlet 21, which draws the fumes into the filter box 2. The fumes flow along an "S"-shaped non-linear path inside the filter box 2. The bend in the path causes the oil mist particles in the fumes to collide with the inner wall of the suction shell 241 under the action of inertia and centrifugal force. The grease in the fumes collide with and adheres to the inner wall of the arc-shaped guide wall. The tiny grease particles adhering to the wall continuously aggregate and merge at the wall surface, forming a continuously flowing liquid oil film. Under the combined action of its own gravity and airflow shear force, this liquid oil film slides down the wall of the arc-shaped guide wall to form oil liquid, achieving the initial separation of oil and gas. The gas after separation and purification is discharged to the outside environment through the air outlet 22. The oil mist content in the discharged gas is greatly reduced, effectively reducing pollution to the kitchen environment.

[0037] Reference Figures 2 to 4The inner wall of the suction housing 241 on the side away from the air inlet 21 is an arc-shaped guide wall 2411, which guides the gas to the fan housing 242. The arc-shaped guide wall 2411 is an arc-shaped curved surface that bulges upwards into the interior of the suction housing 241. Its surface is smooth and continuous, and it is used to smoothly guide the airflow entering from the air inlet 21 to flow downwards into the interior of the fan housing 242. The arc-shaped design of the arc-shaped guide wall 2411 can reduce energy loss when the airflow changes direction, and at the same time, the arc-shaped wall surface can perform preliminary interception and condensation of oil mist in the airflow.

[0038] A filter element 25 is also installed between the suction housing 241 and the fan housing 242. The filter element 25 is located at the connection channel between the suction housing 241 and the fan housing 242, downstream of the arc-shaped guide wall 2411. The filter element 25 is a replaceable filter element, made of activated carbon fiber, non-woven fabric, metal foam, or multi-layer composite filter material. After being guided by the arc-shaped guide wall 2411, the oil fumes first flow into the filter element 25, where oil mist particles and solid impurities are intercepted and adsorbed. The filtered clean gas then enters the interior of the fan housing 242.

[0039] The filter element 25 is located on the upstream side of the fan body 23, so that the gas entering the fan body 23 has been fully filtered and the oil mist content is extremely low. This effectively prevents grease from adhering to the fan impeller and motor surface, ensuring the long-term stability and reliability of the fan body 23.

[0040] The bottom of the filter box 2 also includes a housing bottom cover 2422. The housing bottom cover 2422 is located at the bottom of the filter box 2 (specifically the fan housing 242), and the housing bottom cover 2422 is detachably fixed to the main body of the fan housing 242 by means of screws, snaps or threads.

[0041] It should be noted that the air inlet 21 in this embodiment is a single air inlet structure, that is, only a single air inlet 21 is opened on the top of the filter box 2. The air inlet 21 is directly connected to the exhaust end of the grill 1. All the negative pressure generated by the fan body 23 during operation is concentrated at this single air inlet. Compared with the conventional two-sided air inlet structure, the negative pressure is dispersed in two air inlet channels and the suction power on one side is insufficient. The single air inlet design of this application concentrates all the suction power at the exhaust end of the grill 1, and the suction power per unit area is improved. It can quickly draw a large amount of oil fumes generated by grilling and cooking into the filter box 2 for treatment, effectively preventing the oil fumes from escaping into the kitchen environment. The smoke extraction efficiency is significantly better than that of the two-sided air inlet structure.

[0042] It should be noted that the air outlet 22 is located on the side of the filter box 2 away from the grill 1, and the exhaust direction of the air outlet 22 is opposite to that of the grill 1, directly discharging the filtered gas along with moisture and heat to the external environment. In contrast, the exhaust vent of a conventional grill 1 allows gas to pass through the internal channels of the grill 1 before being discharged. High-temperature, high-humidity gas transfers heat and moisture to various components of the machine as it passes through the interior, leading to increased internal temperature, accelerated aging of electronic components, and a humid internal environment that breeds bacteria. This application, by directing the exhaust vent outwards, effectively reduces the temperature rise and internal humidity of the grill 1, protecting the internal electronic components and mechanical parts, and extending the overall lifespan of the machine.

[0043] Reference Figure 3 The distance between the centerline of the fan body 23 and the inner wall of the fan casing 242 adjacent to the air outlet 22 is L1; the distance between the centerline of the fan body 23 and the inner wall of the fan casing 242 on the other side is L2; ​​L1 > L2.

[0044] It should be noted that more oil accumulates on the side of the suction housing 241 near the arc-shaped guide wall 2411. After the oil slides down this side, it first contacts the filter element 25 to buffer the oil. The filter element 25 needs to be replaced in time to prevent oil from falling into the fan body 23. If the filter element 25 is not replaced in time and the buffered oil overflows downward, the oil will preferentially slide down from this side, and L1>L2. Therefore, the fan body 23 is located on the side away from the arc-shaped guide wall 2411. The lowest point of the fan body 23 and the arc-shaped guide wall 2411 are spatially offset from each other to reduce the possibility of the sliding oil dripping onto the impeller of the fan body 23.

[0045] It should be noted that, Figure 3 This is a cross-sectional view of the suction housing 241 at its center, while the air intake assembly 3 is initially positioned on both sides. Figure 4 This is a cross-sectional view of the suction housing 241 near its edge, showing that the expansion block 311 completely covers the inside of the suction housing 241.

[0046] Reference Figures 5-6 The present invention also includes an air intake component 3, which is installed inside the suction housing 241 and is used to control the cross-sectional size through which the airflow passes at the suction housing 241.

[0047] The air intake assembly 3 includes an inner slider 31, an expansion block 311, a micro air pump 312, a hinge seat 32, an outer frame 33, and a filter layer 34. The inner sliders 31 are symmetrically distributed on both sides of the inside of the suction housing 241, and the expansion blocks 311 are fixedly connected between the inner sliders 31 and the inner wall of the suction housing 241. The expansion block 311 is an inflatable elastic bladder made of rubber material; it is normally in a contracted state and expands perpendicular to the inner wall of the suction housing 241 after inflation. The expansion block 311 is inflated by the micro air pump 312 mounted on the inner slider 31. The micro air pump 312 is a micro electric diaphragm pump, and its outlet is sealed and connected to the air inlet of the expansion block 311.

[0048] Hinged seats 32 are fixedly installed on the side surface of each inner slider 31 facing the inside of the suction housing 241, with the hinged seats 32 on both sides facing each other. Multiple outer frames 33 are hinged together between the two hinged seats 32. The outer frames 33 are rectangular frames made of metal or plastic, and the dimensions of each outer frame 33 are adapted to the internal cross-sectional dimensions of the suction housing 241. The outer frames 33 are arranged in a serrated pattern by being pressed together by the inner sliders 31 on both sides, and a filter layer 34 is provided on the inner surface of the outer frame 33.

[0049] The filter layer 34 can be a metal filter screen or a metal filter plate, used for preliminary filtration of oil.

[0050] Reference Figure 7 The number of outer frames 33 is odd. Adjacent outer frames 33 are hinged together by hinges 331, and the hinges 331 are alternately arranged on different sides of adjacent outer frames 33. Specifically, taking three outer frames 33 as an example, the first outer frame 33 and the second outer frame 33 are connected to each other by hinges 331 at their upper parts, so that the first outer frame 33 and the second outer frame 33 can only rotate upward relative to each other, and their lower parts cannot rotate due to contact. The second outer frame 33 and the third outer frame 33 are connected to each other by hinges 331 at their lower parts, so that the second outer frame 33 and the third outer frame 33 can only rotate downward relative to each other due to the obstruction of adjacent sides. And so on. After an odd number of outer frames 33 are connected by the above-mentioned alternately arranged hinges 331, the rotation directions of adjacent outer frames 33 are alternately opposite, thereby realizing overall folding.

[0051] Disks 332 are mounted on both sides of the outer frame 33, and each disk 332 is rotatably mounted on the side of the outer frame 33. Elastic ropes 333 connect each disk 332 sequentially, and by pulling each disk 332 taut with the elastic ropes 333, the line connecting the centers of each disk 332 becomes a straight line. The elastic ropes 333 are rubber ropes, and their length is adapted to the straight-line distance between the centers of each disk 332. The elastic ropes 333 are used to apply elastic constraint force during the folding process of the outer frame 33, preventing the hinged outer frames 33 from forming an arc-shaped fold due to the accumulation of hinge gaps, and ensuring that each outer frame 33 always folds according to a predetermined serrated arrangement.

[0052] It should be noted that the number of outer frames 33 is odd, so that after the outer frames 33 start from the hinge seat 32 on one side, after an even number of folds, the outer frame 33 at the end will face the outer frame 33 on the other side. If there is an even number of outer frames 33, then after an odd number of folds, the outer frame 33 at the end will fold back to the outer frame 33 on the starting side.

[0053] Reference Figures 8-9 The working principle of intake assembly 3 is as follows:

[0054] In the initial state, the expansion block 311 is not inflated and is in a naturally contracted state. Since one end of the expansion block 311 is connected to the inner walls of both ends of the suction shell 241, after contraction, the whole block retracts towards both ends of the suction shell 241. The inner sliders 31 on both sides are furthest apart under the elastic restoring force of the expansion block 311, and each outer frame 33 is stretched and unfolded into a planar state. At this time, the gas entering only flows through one filter layer 34, and the airflow resistance is minimal. This is suitable for use scenarios where the amount of oil smoke generated by the grill 1 is small.

[0055] When the amount of oil fumes produced by the grill 1 increases or a higher filtration efficiency is required, the user activates the micro air pump 312. The micro air pump 312 fills the expansion block 311 with gas. After the expansion block 311 is filled with gas, it expands. Since one end and the four sides are blocked by the suction shell 241, it cannot expand towards these areas. Only the inner slider 31 at the other end can be pushed, so it can only expand towards the direction of the inner slider 31. This pushes the inner sliders 31 on both sides towards the middle of the suction shell 241, reducing the cross-sectional area of ​​the suction shell 241 through which airflow can pass, thereby concentrating the suction force. At the same time, the inner sliders 31 on both sides move closer to each other, squeezing the outer frame 33 located between them. As the distance between the outer frames 33 decreases and the hinges 331 are alternately arranged on different sides, the outer frames 33 gradually change from a planar state to a vertical state and fold into a sawtooth shape, and the included angle between adjacent outer frames 33 decreases. At this time, the gas entering the suction shell 241 needs to flow through multiple layers of filter 34 in sequence, which increases the effective interception path length and can intercept tiny oil mist particles in the fumes.

[0056] It should be noted that the filter layer 34 is a metal filter layer with a larger mesh than the filter element 25, and it comes into contact with the oil fumes before the filter element 25. It is mainly used for preliminary filtration. When the oil fumes pass through quickly and come into contact with the filter layer 34, which is a metal filter screen or metal filter plate, the temperature of the oil fumes drops sharply due to the fast heat conduction of metal. The gaseous grease is directly liquefied into small oil droplets. The oil is initially intercepted by the filter layer 34 and then gradually flows downward due to gravity and is buffered at the inlet of the suction shell 241.

[0057] Filter element 25 is used for more detailed filtration of oily gas after preliminary filtration. Filter element 25 further intercepts oil stains by adsorption. Oil stains are difficult to clean when they are cached inside and need to be replaced as a whole. The preliminary filtration of filter layer 34 reduces the workload of filter element 25, thereby reducing the frequency of replacement.

[0058] The oil and dirt intercepted by the filter layer 34 can be cleaned directly on both sides of the filter layer 34 after the suction shell 241 is disassembled.

[0059] It is important to note that, such as Figure 3 As shown, the suction housing 241 and the fan housing 242 are not aligned after being connected. The fan housing 242 extends into the suction housing 241 until it is higher than the bottom of the air inlet 21 to block oil stains. The oil stains intercepted by the filter layer 34 will be intercepted by this part of the fan housing 242 that is higher than the bottom of the air inlet 21, preventing them from entering the filter element 25.

[0060] When the outer frame is folded 33, although the interception path length increases, the angle formed at the hinge makes it difficult to clean the internal oil stains.

[0061] When cleaning and maintenance of the air intake assembly 3 is required, the user controls the micro air pump 312 to reverse the airflow, and the gas inside the expansion block 311 is slowly discharged through the air port of the micro air pump 312. The expansion block 311 contracts, losing its thrust on the inner slider 31. Under the elastic restoring force of the expansion block 311, the inner sliders 31 on both sides slide back to their original positions, increasing the distance between the outer frames 33. Each outer frame 33 is then stretched and unfolded into a planar state. At this time, the included angle between each filter layer 34 completely disappears, and each filter layer 34 unfolds into a parallel plane. The user can directly brush or rinse the surface of the filter layer 34 without disassembling each outer frame 33 individually, greatly reducing the cleaning difficulty and maintenance time.

[0062] The micro air pump 312 controls the sliding stroke of the inner slider 31 and the folding degree of the outer frame 33 by controlling the air volume, thereby achieving continuous adjustment of the number of filter layers 34 and the airflow cross-sectional area. Users can flexibly select the working mode of the air intake component 3 according to the oil fume concentration and usage time.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A grilling device with a filtering function, comprising a grilling machine (1) and a filter box (2), wherein the grilling machine (1) has an exhaust end, and the filter box (2) is disposed on one side of the exhaust end, characterized in that, The filter box (2) has an air inlet (21), an air outlet (22) and a fan body (23). The air inlet (21) is connected to the air outlet, and the air outlet (22) is disposed on the filter box (2) and is staggered from the air inlet (21) in the horizontal and / or vertical directions, so that the gas entering from the air inlet (21) flows along a non-linear path in the filter box (2) and is discharged from the air outlet (22). The fan body (23) is located inside the filter box (2).

2. The grilling device with filtering function as described in claim 1, characterized in that: The nonlinear path is "S" shaped, and the air inlet (21), air outlet (22) and fan body (23) are connected in sequence along the airflow direction to form an "S" shaped air duct.

3. The grilling device with filtering function as described in claim 1, characterized in that: The filter box (2) is composed of a suction shell (241) and a fan shell (242). Both the suction shell (241) and the fan shell (242) are hollow and connected at the connection. The inner wall of the suction shell (241) on the side away from the air inlet (21) is an arc-shaped guide wall (2411) that guides the gas to the fan shell (242).

4. The grilling device with filtering function as described in claim 3, characterized in that: A filter element (25) is also installed between the suction shell (241) and the fan shell (242). The filter element (25) covers the entire inlet end of the fan shell (242) and is used to filter the oil and gas flowing through it.

5. The grilling device with filtering function as described in claim 4, characterized in that: The suction shell (241) and the fan housing (242) are connected in a detachable manner by snap-fit ​​or magnetic attraction. The filter element (25) is clamped and fixed between the lower opening of the suction shell (241) and the upper opening of the fan housing (242). When the suction shell (241) is separated from the fan housing (242), the filter element (25) is exposed to the outside for removal, replacement or cleaning.

6. The grilling device with filtering function as described in claim 3, characterized in that: An arc-shaped guide groove (2421) for guiding the gas flow is fixedly connected to the inner surface of the fan housing (242). One end of the arc-shaped guide groove (2421) at its highest point is fixedly connected to the inner wall of the fan housing (242), and the other end of the arc-shaped guide groove (2421) extends toward the air outlet (22) and is fixedly connected to the fan housing (242).

7. The grilling device with filtering function as described in claim 1, characterized in that: The distance between the centerline of the fan body (23) and the inner wall of the fan casing (242) adjacent to the air outlet (22) is L1; the distance between the centerline of the fan body (23) and the inner wall of the fan casing (242) on the other side is L2; ​​L1 > L2.

8. The grilling apparatus with filtering function as described in claim 3, characterized in that: It also includes an air intake assembly (3), which is installed inside the air intake housing (241); The intake assembly (3) includes, The inner sliders (31) are symmetrically distributed on both sides inside the suction shell (241). The inner sliders (31) can partially block the flow section of the air inlet (21) by moving inside the suction shell (241). The hinge seats (32) are installed on each of the inner sliders (31), and multiple outer frames (33) are hinged to each other in sequence between the two hinge seats (32). Each outer frame (33) rotates relative to each other at the hinge point after being squeezed by the inner sliders (31) on both sides, forming a sawtooth arrangement. The inner surface of the outer frame (33) is provided with a filter layer (34).

9. The grilling apparatus with filtering function as described in claim 8, characterized in that: The number of outer frames (33) is odd. Two adjacent outer frames (33) are hinged to each other by hinges (331), and the hinges (331) are alternately arranged on different sides of two adjacent outer frames (33).

10. The grilling apparatus with filtering function as described in claim 8, characterized in that: An expansion block (311) is fixedly connected between the inner slider (31) and the inner wall of the suction shell (241). The expansion block (311) is inflated by a micro air pump (312) installed on the inner slider (31). Each outer frame (33) is rotatably connected to a disc (332) on both sides. The discs (332) on the same side are connected in sequence by elastic ropes (333) and pull each outer frame (33) to close.

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