Air suction equipment

Abstract

The utility model relates to the technical field of kitchen appliances, in particular to air suction equipment, which is used for sucking aerosol containing oil smoke and comprises an equipment main body, a movable panel and a transmission component, a flue is arranged in the equipment main body, and the movable panel is connected with the equipment main body through the transmission component. The air suction device can move relative to the device body under the control of the transmission assembly, so that the air suction device is in a first state and a second state; when the air suction equipment is in the first state, the movable panel moves to block the input end of the flue, and when the air suction equipment is in the second state, the input end of the flue is open. By means of the structure, the movable panel can be controlled to move relative to the main body through the transmission assembly, the input end of the flue is effectively controlled to be opened or closed, and the usability of the air suction equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, specifically to an air intake device. Background Technology

[0002] Cooking fumes are typically produced during the heating and processing of food. These fumes are black substances formed from the incomplete combustion of oil; they condense and become very sticky, making them difficult to clean. Furthermore, they contain various harmful substances such as acrolein, benzene, formaldehyde, crotonaldehyde, and volatile nitrosamines. Inhalation of these fumes can cause irreversible damage to the cook's health. Therefore, range hoods are usually installed in kitchens to reduce the amount of fumes inhaled by the cook.

[0003] Range hoods typically have a flue inside to draw in cooking fumes from the room. Therefore, the flue inlet of most common range hoods is usually open by default, with the flue directly connected to the room. Dirt in the flue may fall into the room through the flue, and when the range hood is not in use, outdoor aerosols may flow into the room through the flue, causing adverse effects. Utility Model Content

[0004] In view of this, the present invention provides an air intake device that can control the opening or closing of the flue inlet.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing an air intake device for inhaling aerosols containing oil fumes, the air intake device including a device body, a movable panel and a transmission assembly, a flue being formed inside the device body, the movable panel being connected to the device body through the transmission assembly, and being able to move relative to the device body under the control of the transmission assembly, causing the air intake device to present a first state and a second state; wherein, when the air intake device presents the first state, the movable panel moves to block the input end of the flue, and when the air intake device presents the second state, the input end of the flue is open.

[0006] In one specific embodiment, the transmission assembly includes a motor, a rotating shaft, and a displacement member. The displacement member is connected to the rotating shaft, and the rotating shaft is connected to the output end of the motor. One of the rotating shaft and the displacement member is fixed to the main body of the device, and the other is fixed to the movable panel.

[0007] In one specific embodiment, the displacement component includes a transmission rod and a displacement rod. The displacement rod has a toothed groove, and the rotating shaft is meshed with the toothed groove. One end of the displacement rod is connected to the transmission rod. The rotating shaft is disposed on the movable panel, and the transmission rod is connected to the movable panel. When the rotating shaft rotates, the transmission rod moves parallel to the toothed groove, causing the displacement rod to move, thereby moving the movable panel relative to the main body of the equipment.

[0008] In one specific embodiment, the transmission rod includes at least two rods, one end of each of the at least two rods is rotatably connected to different positions of the movable panel, and the other end of each of the at least two rods is provided with a groove along the length of the rod. The displacement rod includes a slider, which is slidably embedded in the groove of the at least two rods.

[0009] In one specific embodiment, the toothed groove is vertically formed on the displacement rod.

[0010] In one specific embodiment, the rotating shaft includes a gear, the displacement member includes a rack, the gear is disposed on one of the device body and the movable panel, the rack is disposed on the other of the device body and the movable panel, the gear meshes with the rack, and the gear rotates to drive the movable panel to move relative to the device body.

[0011] In one specific embodiment, the gear is disposed on the main body of the device, and the rack is vertically disposed on the movable panel.

[0012] In one specific embodiment, the number of transmission components is at least two, symmetrically connecting the device body and the movable panel, and at least two transmission components synchronously control the movement of the movable panel relative to the device body.

[0013] In one specific embodiment, the main body of the device includes a first socket portion, and the movable panel includes a second socket portion. The first socket portion and the second socket portion are movably connected. The second socket portion has an air intake opening on its side facing the first socket portion, and the air intake opening is connected to the input end of the flue. When the air intake device is in the first state, the first socket portion and the second socket portion are fitted together, and the side surface of the first socket portion facing the second socket portion blocks the air intake opening. When the air intake device is in the second state, the second socket portion moves relative to the first socket portion until the air intake opening is open.

[0014] In one specific embodiment, the movable panel further includes a condenser mesh, which seals the air intake and has several through holes through which the inlet of the flue is connected to the outside.

[0015] The beneficial effects of this application include: by controlling the movement of the movable panel relative to the main body of the device through the transmission component, the movable panel can be used to block the inlet of the flue, so that the air intake device can flexibly switch between a first state where the inlet of the flue is closed and a second state where the inlet of the flue is open, effectively controlling whether the indoor environment is connected to the flue, and improving the usability of the air intake device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the assembly structure of the air intake device provided by this utility model in its first state;

[0018] Figure 2 A schematic diagram of the assembly structure of the suction device provided by this utility model in a second state;

[0019] Figure 3 Another structural schematic diagram showing the second state of the air intake device provided by this utility model;

[0020] Figure 4 Another structural schematic diagram showing the first state of the air intake device provided by this utility model;

[0021] Figure 5 Another structural schematic diagram of the suction device provided by this utility model in a second state;

[0022] Figure 6 A schematic diagram of the structure of the movable panel and transmission assembly of the air intake device provided by this utility model when it is in the first state;

[0023] Figure 7 A schematic diagram of the structure of the movable panel and transmission assembly when the air intake device provided by this utility model is in its second state;

[0024] Figure 8 This is a schematic diagram of another embodiment of the air intake device provided by this utility model when it is in a second state.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Air intake device; 2. Main body of the device; 21. Flue; 22. First connecting part; 3. Movable panel; 4. Transmission assembly; 41. Motor; 42. Rotating shaft; 421. Gear; 51. Rack; 52. Transmission rod; 521. Rod body; 522. Slide groove; 53. Displacement rod; 531. Tooth groove; 532. Sliding block; 31. Second connecting part; 32. Air intake port; 33. Condensation screen; 34. Transmission part; 35. Connecting rod; 6. Fan. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0029] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0030] Cooking fumes are typically produced during the heating and processing of food. These fumes are black substances formed from the incomplete combustion of oil; they condense and become very sticky, making them difficult to clean. Furthermore, they contain various harmful substances such as acrolein, benzene, formaldehyde, crotonaldehyde, and volatile nitrosamines. Inhalation of these fumes can cause irreversible damage to the cook's health. Therefore, range hoods are usually installed in kitchens to reduce the amount of fumes inhaled by the cook.

[0031] Range hoods typically have a flue to draw in cooking fumes from the room. Therefore, the flue inlet of most modern range hoods is usually open by default, directly connecting the flue to the room. This means that grime and debris from the flue can fall into the room through the flue. Especially in kitchens, to maximize the intake of fumes from the cooking area, the flue inlet is often positioned directly towards the cooking area. If grime falls from the flue, it can end up in the cooking area, causing food safety concerns for the user.

[0032] Moreover, when the range hood is not in use, outdoor aerosols, such as dust and smoke, may also enter the room through the flue, which may have an adverse effect on indoor hygiene and / or the user's health.

[0033] In order to improve or solve the above technical problems, the inventors of this application, after long-term research, have proposed at least the following embodiments.

[0034] See Figure 1 , Figure 2 , Figure 3 , Figure 1 This is a schematic diagram of the assembly structure of the air intake device provided by this utility model in its first state. Figure 2 A schematic diagram of the assembly structure of the air intake device provided by this utility model in its second state. Figure 3 Another structural schematic diagram showing the second state of the suction device provided by this utility model. This application provides a suction device 1, including a device body 2, a movable panel 3, and a transmission assembly 4. A flue 21 is provided inside the device body 2. The movable panel 3 is connected to the device body 2 via the transmission assembly 4 and can move relative to the device body 2 under the control of the transmission assembly 4, causing the suction device 1 to present a first state and a second state.

[0035] When the suction device 1 is in the first state, the movable panel 3 moves to block the input end of the flue 21; when the suction device 1 is in the second state, the input end of the flue 21 is open.

[0036] The structure provided in this embodiment allows the movable panel 3 to move relative to the main body 2 via the transmission component 4. When the flue 21 needs to be closed, the movable panel 3 can be used to block the input end of the flue 21. When the flue 21 needs to be used to inhale aerosols, the movable panel 3 can be moved relative to the main body 2 until the input end is open. This allows the suction device 1 to flexibly switch between a first state where the input end of the flue 21 is closed and a second state where the input end is open, effectively controlling whether the indoor environment is connected to the flue 21 and improving the usability of the suction device 1.

[0037] See Figure 4 , Figure 5 , Figure 4 Another structural schematic diagram showing the first state of the air intake device provided by this utility model. Figure 5 This is another structural schematic diagram showing the second state of the suction device provided by this utility model. In one embodiment of this application, the transmission component 4 may include a motor 41, a rotating shaft 42, and a displacement member. The displacement member is drivenly connected to the rotating shaft 42, and the rotating shaft 42 is connected to the output end of the motor 41. One of the rotating shaft 42 and the displacement member is fixed to the device body 2, and the other is fixed to the movable panel 3. The motor 41 is used to drive the rotating shaft 42 to rotate relative to the suction device 1, thereby driving the displacement member to move.

[0038] Driven by the motor 41, the rotating shaft 42 can rotate relative to the displacement member. The displacement member can move relative to the rotating shaft 42 under the transmission action of the rotating shaft 42, thereby driving the movable panel 3 to move relative to the main body 2 of the device. This effectively switches the outer contour of the suction device 1 between the first state and the second state, thereby controlling the opening or closing of the input end of the flue 21 and improving the usability of the suction device 1.

[0039] See Figure 6 , Figure 7 , Figure 6 A schematic diagram of the structure of the movable panel and transmission components when the air intake device provided by this utility model is in its first state. Figure 7 This is a schematic diagram of the structure of the movable panel and transmission assembly when the suction device provided by this utility model is in its second state. In one embodiment of this application, the displacement component may specifically include a transmission rod 52 and a displacement rod 53. The displacement rod 53 has a toothed groove 531, and the rotating shaft 42 is meshed with the toothed groove 531. One end of the displacement rod 53 is connected to the transmission rod 52. The rotating shaft 42 is disposed on the movable panel 3, and the transmission rod 52 is connected to the movable panel 3. When the rotating shaft 42 rotates, the transmission rod 52 moves parallel to the toothed groove 531, causing the displacement rod 53 to move, thereby causing the movable panel 3 to move relative to the device body 2.

[0040] In the structure provided in this embodiment, the rotating shaft 42 is connected to the toothed groove 531, so that the displacement rod 53 with the toothed groove 531 can move relative to the main body 2 parallel to the toothed groove 531. In turn, the transmission rod 52 that drives the displacement rod 53 moves with the movement of the displacement rod 53, thereby driving the movable panel 3 to move relative to the main body 2. This allows the outer contour of the air intake device 1 to switch between the first state and the second state, thereby controlling the opening or closing of the input end of the flue 21 and improving the usability of the air intake device 1.

[0041] In one embodiment of this application, the transmission rod 52 includes at least two separate rod bodies 521. One end of each of the at least two rod bodies 521 is rotatably connected to different positions of the movable panel 3. The other end of each of the at least two rod bodies 521 is provided with a groove 522 along the length direction of the rod body 521. The displacement rod 53 includes a slider 532, which is slidably embedded in the groove 522 of the at least two rod bodies 521.

[0042] like Figure 4 As shown, when the suction device 1 is in the first state, the input end of the flue 21 is closed, and the movable panel 3 is partially fitted onto the main body 2 of the device. At this time, the two rods 521 are tightened towards each other until the slider 532 abuts against the inner wall of the groove 522 formed by the two rods 521. At this time, the two rods 521 are horizontal and partially overlap. Figure 5As shown, when the suction device 1 is in the second state, the inlet end of the flue 21 is open. At this time, the movable panel 3 is not connected to the main body 2 of the device. The two rods 521 extend and open under the action of gravity. The slider 532 can abut against the inner wall of the groove 522 formed by the two rods 521 to limit the movable panel 3 and the two rods 521.

[0043] During the transition from the first state to the second state of the suction device 1, the rotating component rotates, and the displacement rod 53 moves upward relative to the rotating component along the tooth groove 531. The slider 532 on the displacement rod 53 moves upward with the movement of the displacement rod 53, thereby causing the slider 532 to move from one end of the groove 522 of the two rods 521 to the other end until the two rods 521 unfold and open under the action of gravity. The two ends of the rods 521 are respectively connected to the displacement rod 53 and the movable panel 3 to pull the movable panel 3 and reduce the probability of the movable panel 3 falling off the suction device 1.

[0044] In one embodiment of this application, the groove 531 can be vertically formed on the displacement rod 53. Since the aerosols generated in the cooking area are typically at a higher temperature than the indoor environment, these aerosols naturally form an upward airflow. Therefore, the suction device 1 is usually positioned above the cooking area, with the inlet end of the flue 21 typically aligned with the cooking area. Sufficient space exists between the suction device 1 and the cooking area to allow the suction device 1 to draw in the aerosols containing oil fumes and to provide space for the user to operate the cooking area and the suction device 1. Therefore, vertically forming the groove 531 on the displacement rod 53 allows for control of the movable panel 3 relative to the main body 2 within the space between the cooking area and the suction device 1. This method of movement is simple and reliable, requires minimal space, and facilitates subsequent cleaning and maintenance.

[0045] Optionally, such as Figure 6 , 7 As shown, the movable panel 3 may also include a transmission part 34, and the transmission assembly 4 may also include a connecting rod 35. Relative to the input end of the flue 21, the transmission part 34 is symmetrically arranged on the side surface of the movable panel 3 facing the main body 2. One end of the connecting rod 35 is connected to the transmission part 34, and the other end is connected to the end of the rod body 521 away from the displacement member. The number of connecting rods 35, the number of transmission parts 34, and the number of rod bodies 521 correspond one-to-one. When the displacement member moves, the connecting rod 35 transmits the movement of the rod body 521 to the transmission part 34, thereby driving the transmission part 34 to move along the direction in which the main body 2 and the movable panel 3 are fitted together. The connecting rod 35, the transmission part 34, and the rod body 521 can play a role in transmission and shock absorption between the displacement rod 53 and the movable panel 3, making the force on the movable panel 3 more even and enabling the movable panel 3 to move more smoothly and stably relative to the main body 2, thus improving the stability of the air intake device 1.

[0046] See Figure 8 , Figure 8 This is a schematic diagram of another embodiment of the suction device provided by this utility model when it is in a second state. In one embodiment of this application, the rotating shaft 42 includes a gear 421, and the displacement member includes a rack 51. The gear 421 is disposed on one of the device body 2 and the movable panel 3, and the rack 51 is disposed on the other of the device body 2 and the movable panel 3. The gear 421 meshes with the rack 51, and the gear 421 rotates to drive the movable panel 3 to move relative to the device body 2.

[0047] The structure provided in this embodiment enables the relative movement of the main body 2 and the movable panel 3 through the meshing gears 421 and rack 51. The transmission relationship between the gears 421 and rack 51 is simple and reliable, easy to maintain, and can improve the stability of the air intake device 1.

[0048] In one embodiment of this application, the gear 421 can be disposed on the main body 2 of the device, and the rack 51 is vertically disposed on the movable panel 3. Disposing the gear 421 connected to the motor 41 on the main body 2 of the device facilitates the internal circuit layout of the suction device 1 and facilitates the supply of power to the motor 41 to drive the gear 421 to rotate. The rack 51 being vertically disposed on the movable panel 3 can directly and effectively control the movement of the movable panel 3 relative to the main body 2 in the vertical direction.

[0049] In one embodiment of this application, the number of transmission components 4 is at least two. At least two transmission components 4 are symmetrically connected to the device body 2 and the movable panel 3, and at least two transmission components 4 can synchronously control the movement of the movable panel 3 relative to the device body 2. This allows for the uniform application of force to the movable panel 3, enabling the device body 2 to move stably and improving the structural stability of the suction device 1.

[0050] In one embodiment of this application, the main body 2 of the device includes a first socket 22, and the movable panel 3 includes a second socket 31. The first socket 22 and the second socket 31 are movably connected. The second socket 31 has an air intake 32 on its side facing the first socket 22. The air intake 32 is connected to the input end of the flue 21.

[0051] When the air intake device 1 is in the first state, the first socket 22 and the second socket 31 are fitted together, and the surface of the first socket 22 facing the second socket 31 blocks the air intake 32. When the air intake device 1 is in the second state, the second socket 31 moves relative to the first socket 22 until the air intake 32 is open.

[0052] like Figure 4 , Figure 5 , Figure 8As shown, the air intake 32 can be formed downward within the second sleeve 31, so that when the air intake device 1 is in the first state, the first sleeve 22 is fitted into the air intake 32, thereby blocking the air intake 32 to close the input end of the flue 21, thereby isolating the flue 21 from the indoor environment, making it difficult for aerosols in the flue 21 and even the outside to flow back into the room through the air intake 32, thus improving the usability of the air intake device 1.

[0053] Optionally, the distance between the lower surface of the first socket 22 and the second socket 31, away from the user, and the cooking area can be smaller than the distance between the lower surface of the first socket 22 and the second socket 31, closer to the user, and the cooking area. To save installation space, the side of the suction device 1 away from the user is usually placed close to the wall. This makes it difficult to install the air intake 32 on this side to draw in aerosols, potentially causing fumes to condense on the wall and affecting the hygiene of the cooking area. Therefore, the air intake 32 located on the lower surface of the second socket 31 can be slightly angled towards the user to draw in aerosols escaping towards the wall, reducing the probability of fumes condensing on the wall and improving the usability of the suction device 1.

[0054] In one embodiment of this application, the movable panel 3 further includes a condenser mesh 33, which can seal the air intake 32 and has several through holes. The inlet of the flue 21 is connected to the outside through the through holes. By setting the condenser mesh 33 corresponding to the air intake 32, the condenser mesh 33 can be used to cool and accelerate the aerosol entering the flue 21 through the air intake 32. This not only removes some of the oil fumes by condensation but also increases the gas flow rate, making it easier for the remaining oil fumes to enter the flue 21 with the airflow and be discharged outdoors. This improves the working efficiency of the air intake device 1 and reduces the adverse environmental impact of the oil fumes discharged outdoors.

[0055] Optionally, a fan 6 may be installed in the flue 21 of the air intake device 1. The input end of the fan 6 faces the input section of the flue 21, and the output end of the fan 6 faces the output end of the flue 21 that connects to the outside, thereby accelerating the flow rate of the gas near the air intake device 1, so as to effectively suck in the aerosol generated in the cooking area and improve the working efficiency of the air intake device 1.

[0056] In this utility model, the terms "embodiment" and "implementation method" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this utility model. The appearance of these phrases in various places in the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this utility model can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this utility model can be arbitrarily combined to form another embodiment that does not depart from the spirit and scope of the technical solution of this utility model, provided there is no contradiction between them.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solution of this utility model should not depart from the spirit and scope of the technical solution of this utility model.

Claims

1. A suction device, characterized in that, For inhaling aerosols containing oil fumes. The air intake device includes a device body (2), a movable panel (3) and a transmission component (4). A flue (21) is provided inside the device body (2). The movable panel (3) is connected to the device body (2) through the transmission component (4) and can move relative to the device body (2) under the control of the transmission component (4), so that the air intake device (1) presents a first state and a second state. When the suction device (1) is in the first state, the movable panel (3) moves to block the input end of the flue (21); when the suction device (1) is in the second state, the input end of the flue (21) is open.

2. The suction device according to claim 1, characterized in that, The transmission assembly (4) includes a motor (41), a rotating shaft (42) and a displacement member. The displacement member is connected to the rotating shaft (42), and the rotating shaft (42) is connected to the output end of the motor (41). One of the rotating shaft (42) and the displacement member is fixed to the main body of the device (2), and the other is fixed to the movable panel (3).

3. The suction device according to claim 2, characterized in that, The displacement component includes a transmission rod (52) and a displacement rod (53). The displacement rod (53) has a toothed groove (531). The rotating shaft (42) is meshed with the toothed groove (531). One end of the displacement rod (53) is connected to the transmission rod (52). The rotating shaft (42) is located on the movable panel (3). The transmission rod (52) is connected to the movable panel (3). When the rotating shaft (42) rotates, the transmission rod (52) moves parallel to the toothed groove (531) and drives the displacement rod (53) to move, thereby moving the movable panel (3) relative to the main body (2) of the equipment.

4. The suction device according to claim 3, characterized in that, The transmission rod (52) includes at least two rod bodies (521), one end of each of the at least two rod bodies (521) is rotatably connected to different positions of the movable panel (3), and the other end of each of the at least two rod bodies (521) is provided with a groove (522) along the length direction of the rod body (521). The displacement rod (53) includes a slider (532), which is slidably embedded in the groove (522) of the at least two rod bodies (521).

5. The suction device according to claim 3, characterized in that, The tooth groove (531) is vertically formed on the displacement rod (53).

6. The suction device according to claim 2, characterized in that, The rotating shaft (42) includes a gear (421), and the displacement member includes a rack (51). The gear (421) is disposed on one of the device body (2) and the movable panel (3), and the rack (51) is disposed on the other of the device body (2) and the movable panel (3). The gear (421) meshes with the rack (51), and the gear (421) rotates to drive the movable panel (3) to move relative to the device body (2).

7. The suction device according to claim 6, characterized in that, The gear (421) is disposed on the main body (2) of the device, and the rack (51) is vertically disposed on the movable panel (3).

8. The suction device according to claim 1, characterized in that, The number of transmission components (4) is at least two, symmetrically connecting the device body (2) and the movable panel (3), and at least two transmission components (4) synchronously control the movable panel (3) to move relative to the device body (2).

9. The suction device according to claim 1, characterized in that, The main body (2) of the device includes a first socket (22), and the movable panel (3) includes a second socket (31). The first socket (22) and the second socket (31) are movably connected. The second socket (31) has an air intake (32) on its side facing the first socket (22). The air intake (32) is connected to the input end of the flue (21). When the air intake device (1) is in the first state, the first sleeve (22) is fitted with the second sleeve (31), and the surface of the first sleeve (22) facing the second sleeve (31) blocks the air intake (32). When the air intake device (1) is in the second state, the second sleeve (31) moves relative to the first sleeve (22) until the air intake (32) is open.

10. The suction device according to claim 9, characterized in that, The movable panel (3) also includes a condenser mesh (33), which is sealed at the air intake (32) and has several through holes. The input end of the flue (21) is connected to the outside through the through holes.

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