Air duct device and floor air conditioner

Abstract

The utility model provides an air duct device and a floor air conditioner, relates to the technical field of air conditioners, and aims to solve the problems that air flow in an existing floor air conditioner is disordered after entering through a rear coaming, and vortex, turbulent vibration and noise are easy to form. The air duct device comprises an air duct component and a back plate, the air duct component comprises an air duct mounting plate with an opening and an air duct wall surrounding the opening, and the air duct wall protrudes out of the air duct mounting plate backwards; the back plate and the air duct mounting plate are opposite and spaced, a receding opening opposite to the opening is formed in the back plate, and the air duct wall extends to the back plate. According to the air duct component, the area, around the air duct wall, of the air duct component is shielded by the back plate, the situation that due to the fact that an irregular structure exists around the air duct wall, airflow enters the air duct through the back panel and is disordered is effectively avoided, vortex and turbulent vibration are reduced, the air outlet efficiency is guaranteed, and noise of a formed cavity can be shielded.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, and in particular to an air duct device and a vertical air conditioner. Background Art

[0002] Typically, a vertical air conditioner is provided with an air duct component inside, the air duct component is provided with an opening, and an air guide ring surrounding the opening is connected to the back of the air duct component, wherein the air flow can be guided to the opening by the air guide ring.

[0003] However, since the air guide ring protrudes from the back of the air duct component and there is an irregular concave structure around the air guide ring, the airflow becomes relatively chaotic after entering through the rear panel, which easily forms vortices, turbulence and noise. Utility Model Content

[0004] The first object of the present invention is to provide an air duct device to solve the technical problem that the airflow in the existing vertical air conditioner is relatively chaotic after entering through the rear panel, and is prone to form vortexes, turbulence and noise.

[0005] The utility model provides an air duct device, comprising an air duct component and a back plate, wherein the air duct component comprises an air duct mounting plate provided with an opening and an air duct wall provided around the opening, wherein the air duct wall protrudes rearward from the air duct mounting plate; the back plate is opposite to and spaced from the air duct mounting plate, and the back plate is provided with a clearance opening opposite to the opening, and the air duct wall extends to the back plate.

[0006] By making the back panel and the duct mounting plate of the duct component opposite to and spaced apart, and extending the duct wall of the duct component to the back panel, the area of ​​the duct component around the duct wall is shielded by the back panel, effectively avoiding the situation where the airflow is relatively chaotic after entering through the rear panel due to the presence of irregular structures around the duct wall. This not only reduces eddies and turbulence, ensuring air outlet efficiency, but also can shield the formed cavity noise, thereby achieving the effect of reducing noise.

[0007] In addition, the cavity between the back panel and the duct mounting plate can be used to isolate condensation, preventing it from forming in front of the duct mounting plate (the side of the duct mounting plate facing away from the evaporator). Furthermore, the back panel improves the overall aesthetics of the duct device and enhances the user's visual experience.

[0008] Furthermore, the interior space of the duct wall forms an air duct cavity; the duct component further includes an upper transverse wall located at the top of the duct mounting plate, and a lower transverse wall located at the bottom of the duct mounting plate. The upper end of the back plate is connected to the upper transverse wall, and the lower end of the back plate is connected to the lower transverse wall. This arrangement allows the upper and lower ends of the back plate to be connected to the duct mounting plate, thereby allowing the duct mounting plate and the back plate to jointly form a relatively stable frame structure.

[0009] Furthermore, the air duct wall is connected to the edge of the opening. This arrangement can prevent the back plate from blocking the opening, thereby ensuring the air intake.

[0010] Furthermore, the back panel includes a vertical wall and a guide wall, the clearance opening is formed in the vertical wall, the guide wall surrounds the clearance opening and is arranged at the edge of the clearance opening, and the air duct wall is connected to the edge of the clearance opening via the guide wall. In the direction from back to front, the guide wall extends obliquely toward the centerline of the clearance opening. This arrangement, on the one hand, can guide the airflow entering the air duct wall, allowing it to enter the air duct wall smoothly. On the other hand, the reduction in the axial cross-sectional area of ​​the guide wall can be used to accelerate the airflow, thereby improving the air outlet efficiency.

[0011] Furthermore, the side of the guide wall near the clearance opening is a convex arc surface. This configuration can achieve a smooth transition from the vertical wall to the guide wall, avoiding the formation of sharp edges between the vertical wall and the guide wall, and between the guide wall and the air duct wall, so that when the air flows toward the air duct wall, vortices will not be generated due to the presence of sharp edges.

[0012] Furthermore, the outer edge of the vertical wall is folded toward the air duct mounting plate to form a flange. This arrangement increases the structural strength of the backboard without increasing the overall thickness of the backboard, thereby reducing the weight of the backboard and the material cost of the backboard.

[0013] Furthermore, the side of the vertical wall facing away from the air duct mounting plate is a plane. This arrangement makes the back of the back plate a flat surface, and there is no concave structure on the back of the back plate, thereby further reducing the risk of eddy current generation.

[0014] Furthermore, the air duct device further includes an air outlet grille and an exhaust assembly. The air outlet grille is fixedly arranged relative to the air duct component and is located in front of the air duct component. The exhaust assembly includes an exhaust motor and an exhaust impeller. The exhaust motor is mounted on the air outlet grille and is located in the air duct cavity. The motor shaft of the exhaust motor extends toward the back panel, and the exhaust impeller is fixedly mounted on the motor shaft. The arrangement of the air outlet grille ensures that after the airflow is blown forward through the air duct cavity, it will be rectified by the air outlet grille, and the airflow will be guided by the air outlet grille to ensure the air outlet effect.

[0015] Furthermore, the duct mounting plate is provided with a plurality of openings, which are spaced apart in the vertical direction, each of which is surrounded by the duct wall, and the back plate is provided with a plurality of clearance openings, each of which corresponds to the plurality of openings. This arrangement can increase the air outlet area of ​​the duct device in the height direction, thereby ensuring the air output volume.

[0016] The second object of the present invention is to provide a vertical air conditioner to solve the technical problem that the airflow in the existing vertical air conditioner is relatively chaotic after entering through the rear panel, and is prone to forming vortexes, turbulence and noise.

[0017] The vertical air conditioner provided by the utility model includes a shell and the above-mentioned air duct device, the air duct device is arranged inside the shell, the shell includes a front panel and a rear panel, the front panel is provided with an air supply port connected to the opening, and the rear panel is provided with an air inlet connected to the opening.

[0018] By arranging the above-mentioned air duct device in the vertical air conditioner, the vertical air conditioner accordingly has all the advantages of the above-mentioned air duct device, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0020] Figure 1 A longitudinal sectional view of a vertical air conditioner provided by an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 A magnified view of the local structure at point A;

[0022] Figure 3 A longitudinal sectional view of a partial structure of a vertical air conditioner provided by an embodiment of the utility model;

[0023] Figure 4 A schematic diagram of the partial structure of a vertical air conditioner provided by an embodiment of the utility model;

[0024] Figure 5 A partial structural exploded view of a vertical air conditioner provided by an embodiment of the present utility model;

[0025] FIG6( a ) is a velocity vector diagram of a vertical air conditioner in an air duct cavity provided by an embodiment of the present invention;

[0026] FIG6( b ) is a velocity vector diagram of a vertical air conditioner in the air duct cavity in the prior art;

[0027] Figure 7 Graphs showing measured noise data of the vertical air conditioner of this embodiment and a vertical air conditioner without a back plate in the prior art when the exhaust motor speed is 650 rpm and 850 rpm, respectively.

[0028] Description of reference numerals:

[0029] 010-air duct device; 020-housing; 021-front panel; 022-rear panel; 030-electric heater;

[0030] 100-air duct component; 110-air duct mounting plate; 111-opening; 120-air duct wall; 130-upper horizontal wall; 140-lower horizontal wall; 200-back plate; 210-vertical wall; 211-yield opening; 220-guide wall; 230-flange; 300-insulation cavity; 400-air outlet grille; 500-exhaust assembly; 510-exhaust motor; 520-exhaust impeller. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following describes in detail the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] Figure 1 A longitudinal sectional view of a vertical air conditioner provided in this embodiment; Figure 2 for Figure 1 A magnified view of the local structure at point A; Figure 3 A longitudinal sectional view of a partial structure of a vertical air conditioner provided in this embodiment;

[0033] Figure 4 This is a partial structural diagram of the vertical air conditioner provided in this embodiment. Figures 1 to 4 As shown, this embodiment provides a duct device 010, including a duct component 100 and a back panel 200. Specifically, the duct component 100 includes a duct mounting plate 110 provided with an opening 111 and a duct wall 120 arranged around the opening 111, and the duct wall 120 protrudes backward from the duct mounting plate 110; the back panel 200 is opposite to and spaced from the duct mounting plate 110, and the back panel 200 is provided with a makeshift opening 211 opposite to the opening 111, and the duct wall 120 extends to the back panel 200.

[0034] By making the back panel 200 opposite to and spaced apart from the duct mounting plate 110 of the duct component 100, and extending the duct wall 120 of the duct component 100 to the back panel 200, the area of ​​the duct component 100 around the duct wall 120 is shielded by the back panel 200, effectively avoiding the situation where the airflow is relatively chaotic after entering through the rear panel 022 due to the presence of irregular structures around the duct wall 120. This not only reduces eddies and turbulence, ensuring air outlet efficiency, but also can shield the formed cavity noise, thereby achieving the effect of reducing noise.

[0035] Furthermore, the cavity between the back plate 200 and the duct mounting plate 110 can be used to isolate condensation, preventing it from forming in front of the duct mounting plate 110 (the side of the duct mounting plate 110 facing away from the evaporator). Furthermore, the provision of the back plate 200 enhances the overall aesthetics of the duct device 010, improving the user's visual experience.

[0036] Please continue to refer to Figure 2 In this embodiment, the air duct wall 120 is connected to the edge of the clearance opening 211 .

[0037] This arrangement can prevent the back plate 200 from blocking the opening 111, thereby ensuring the air intake.

[0038] Figure 5 This is a partial structural exploded diagram of the vertical air conditioner provided in this embodiment. Figure 2 , and combined with Figure 5 In this embodiment, the back plate 200 may include a vertical wall 210 and a guide wall 220. Specifically, the clearance port 211 is opened on the vertical wall 210, the guide wall 220 surrounds the clearance port 211 and is arranged at the edge of the clearance port 211, and the air duct wall 120 is connected to the edge of the clearance port 211 through the guide wall 220, wherein, along the direction from back to front, the guide wall 220 extends obliquely toward the direction close to the center line of the clearance port 211.

[0039] The arrangement of the guide wall 220 creates a flared structure on the back panel 200 at the opening 211, with the larger diameter end of the flared opening facing rearward. This arrangement not only guides the airflow into the duct wall 120, allowing it to flow smoothly, but also accelerates the airflow by reducing the axial cross-sectional area of ​​the guide wall 220, thereby improving airflow efficiency.

[0040] Please continue to refer to Figure 2 In this embodiment, the surface of the guide wall 220 close to the clearance opening 211 can be set as a convex arc surface.

[0041] This setting can achieve a smooth transition from the vertical wall 210 to the guide wall 220, avoiding the formation of sharp edges between the vertical wall 210 and the guide wall 220 and between the guide wall 220 and the air duct wall 120. On the one hand, it ensures that no vortex will occur due to the presence of sharp edges during the flow of air toward the air duct wall 120. On the other hand, it can also prevent scratches during assembly operations.

[0042] Specifically, in this embodiment, the guide wall 220 may be an arc-shaped wall, and the guide wall 220 may be formed by bending the vertical wall 210 at the edge of the clearance opening 211 .

[0043] Please continue to refer to Figure 2 and Figure 5 In this embodiment, the outer edge of the vertical wall 210 is folded toward the air duct mounting plate 110 to form a flange 230.

[0044] The arrangement of the flange 230 increases the structural strength of the back plate 200 without increasing the overall thickness of the back plate 200 , thereby reducing not only the weight of the back plate 200 but also the material cost of the back plate 200 .

[0045] Please continue to refer to Figure 4 and Figure 5 In this embodiment, the side of the vertical wall 210 facing away from the air duct mounting plate 110 is a plane, that is, the back side of the back plate 200 is a plane.

[0046] This arrangement makes the back surface of the back plate 200 a flat surface, and there is no concave structure on the back surface of the back plate 200, thereby further reducing the risk of eddy current generation.

[0047] Please continue to refer to Figure 2 and Figure 3 In this embodiment, the internal space of the duct wall 120 forms an duct cavity; the duct component 100 may further include an upper transverse wall 130 located at the top of the duct mounting plate 110, and a lower transverse wall 140 located at the bottom of the duct mounting plate 110, the upper end of the back plate 200 is connected to the upper transverse wall 130, and the lower end of the back plate 200 is connected to the lower transverse wall 140.

[0048] This arrangement enables both the upper and lower ends of the back plate 200 to be connected to the air duct mounting plate 110 , so that the air duct mounting plate 110 and the back plate 200 together form a relatively stable frame structure.

[0049] The upper transverse wall 130 , the air duct mounting plate 110 , the lower transverse wall 140 and the back plate 200 together form a heat-insulating cavity 300 surrounding the air duct cavity.

[0050] The setting of the above-mentioned insulation cavity 300 realizes the temperature transition between the front of the insulation cavity 300 and the rear of the insulation cavity 300, so that the temperatures at the front of the insulation cavity 300, the inside of the insulation cavity 300 and the rear of the insulation cavity 300 are reduced successively, thereby reducing the temperature difference between the front and rear of the air duct mounting plate 110, and reducing the temperature difference between the front and rear of the back plate 200, thereby effectively preventing condensation from being generated on the air duct mounting plate 110.

[0051] In this embodiment, the back plate 200 can be fixedly connected to the air duct component 100 by screwing.

[0052] Please continue to refer to Figure 2 and Figure 3 In this embodiment, the air duct device 010 may further include an air outlet grille 400 and an exhaust assembly 500. Specifically, the air outlet grille 400 is fixedly arranged relative to the air duct component 100, and the air outlet grille 400 is located in front of the air duct component 100; the exhaust assembly 500 includes an exhaust motor 510 and an exhaust impeller 520, wherein the exhaust motor 510 is installed on the air outlet grille 400, and the exhaust motor 510 is located in the air duct cavity, the motor shaft of the exhaust motor 510 extends toward the back panel 200, and the exhaust impeller 520 is fixedly sleeved on the motor shaft.

[0053] During operation of the air duct device 010, the exhaust motor 510 is activated, driving the exhaust impeller 520 to rotate, causing air to enter the air duct cavity surrounded by the air duct wall 120 through the clearance opening 211 of the back panel 200. The air then flows through the air duct cavity to the air outlet grille 400, thereby delivering air to the room. The air outlet grille 400 is configured so that after the air flows forward through the air duct cavity, it is rectified by the air outlet grille 400, guiding the air flow outward to ensure effective air delivery.

[0054] Please continue to refer to Figure 4 and Figure 5 In this embodiment, the air duct mounting plate 110 has two openings 111, and the two openings 111 are arranged at intervals in the up and down directions. Each opening 111 is surrounded by an air duct wall 120. Correspondingly, the back plate 200 has two makeshift openings 211, and the two makeshift openings 211 correspond to the two openings 111 respectively.

[0055] By setting the number of openings 111 to two and arranging them at intervals in the vertical direction, not only can the air outlet area of ​​the duct device 010 be increased in the height direction to ensure the air outlet volume, but also when the duct device 010 is installed on the housing 020 of the vertical air conditioner, it will not cause the vertical air conditioner to be too high, avoiding the risk of tipping caused by the increase in the center of gravity.

[0056] In other embodiments, the openings 111 may be provided in other numbers and arrangements. In this case, the back plate 200 is provided with corresponding openings 211 , which is not limited in this embodiment.

[0057] In addition, this embodiment also provides a vertical air conditioner, including a shell 020 and the above-mentioned air duct device 010, wherein the air duct device 010 is arranged inside the shell 020, and the shell 020 includes a front panel 021 and a rear panel 022, the front panel 021 has an air supply port connected to the opening 111, and the rear panel 022 has an air inlet connected to the opening 111.

[0058] By arranging the air duct device 010 in the vertical air conditioner, the vertical air conditioner accordingly has all the advantages of the air duct device 010, which will not be described in detail here.

[0059] Please continue to refer to Figure 1 、 Figure 4 and Figure 5 In this embodiment, the vertical air conditioner may further include an electric heater 030. Specifically, the electric heater 030 is located between the air duct device 010 and the rear panel 022. The upper end of the electric heater 030 is connected to the upper horizontal wall 130 of the air duct component 100, and the lower end of the electric heater 030 is connected to the lower horizontal wall 140 of the air duct component 100.

[0060] Through the above-mentioned arrangement, the electric heater 030 can be fixed to the air duct component 100. On the one hand, there is no need to set a separate fixing bracket for the electric heater 030, which saves the number of parts and is conducive to improving assembly efficiency. On the other hand, the electric heater 030 and the air duct device 010 form a modular structure, so that when performing wiring operations, the cables of the electric heater 030 and the cables of the exhaust motor 510 can be straightened out together and connected to the electrical control box, so that the wiring operations of the electric heater 030 and the exhaust motor 510 can be performed together, effectively improving the wiring efficiency.

[0061] In addition, this method of fixing the electric heater 030 at both ends not only increases the number of fixing points, which can avoid the shaking of the electric heater 030 due to its excessive length, thereby ensuring the installation stability of the electric heater 030, but also increases the distribution area of ​​the fixing points, which plays a certain corrective role on the shape of the electric heater, and effectively suppresses the deformation that may occur in the electric heater 030 during long-term use.

[0062] It should be noted that, generally speaking, the side of a floor-standing air conditioner that faces the indoor space or the indoor user activity area is the front side of the floor-standing air conditioner; and the side of the floor-standing air conditioner that faces the corner or the wall is its rear side. Specifically in this embodiment, the "front and rear direction" and "up and down direction" of the floor-standing air conditioner are respectively as follows: Figure 1 、 Figure 3 and Figure 5 As indicated by the corresponding arrows.

[0063] Figure 6(a) is a velocity vector diagram of the vertical air conditioner in the air duct cavity provided by this embodiment. As shown in Figure 6(a), for the solution provided by this embodiment, the arrangement of the back plate 200 makes the flow velocity in the air duct cavity horn-shaped without forming vortices.

[0064] Figure 6(b) shows a velocity vector diagram of the air duct cavity of a conventional vertical air conditioner. As shown in Figure 6(b), the conventional solution lacks a back plate 200, leaving a concave area around the air duct wall 120. This creates significant eddy currents within the air duct cavity, significantly impacting noise.

[0065] In Figure 6(a) and Figure 6(b), the vertical axis shows the direction and speed of the wind.

[0066] Figure 7 Graphs showing actual noise data of the floor-standing air conditioner of this embodiment and a floor-standing air conditioner in the prior art without the back plate 200 when the exhaust motor 510 rotates at 650 rpm and 850 rpm, respectively.

[0067] Among them, for the vertical air conditioner of the present application, when the exhaust motor 510 rotates at 650 rpm, the noise level is 44.5 dB, while the noise level of the vertical air conditioner of the prior art at this rotation speed is 45.1 dB, which is higher than the noise level generated by the vertical air conditioner of the present embodiment at the current rotation speed; for the vertical air conditioner of the present application, when the exhaust motor 510 rotates at 850 rpm, the noise level is 50.8 dB, while the noise level of the vertical air conditioner of the prior art at this rotation speed is 51.2 dB, which is also higher than the noise level generated by the vertical air conditioner of the present embodiment at the current rotation speed.

[0068] Although the present invention is disclosed as above, it is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope defined by the claims.

[0069] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0070] In the above embodiments, descriptions of directions such as “upper”, “lower”, “front”, “back”, “inner”, “outer”, and “side” are all based on the drawings.

[0071] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An air duct device, characterized in that: The invention comprises an air duct component (100) and a back plate (200), wherein the air duct component (100) comprises an air duct mounting plate (110) provided with an opening (111) and an air duct wall (120) arranged around the opening (111), wherein the air duct wall (120) protrudes rearward from the air duct mounting plate (110); the back plate (200) is opposite to and spaced from the air duct mounting plate (110), the back plate (200) is provided with a clearance opening (211) opposite to the opening (111), and the air duct wall (120) extends to the back plate (200).

2. The air duct device according to claim 1, characterized in that: The internal space of the air duct wall (120) forms an air duct cavity; the air duct component (100) further includes an upper transverse wall (130) located at the top end of the air duct mounting plate (110), and a lower transverse wall (140) located at the bottom end of the air duct mounting plate (110); the upper end of the back plate (200) is connected to the upper transverse wall (130), and the lower end of the back plate (200) is connected to the lower transverse wall (140).

3. The air duct device according to claim 2, characterized in that: The air duct wall (120) is connected to the edge of the clearance opening (211).

4. The air duct device according to claim 3, characterized in that: The back plate (200) comprises a vertical wall (210) and a guide wall (220); the clearance opening (211) is opened on the vertical wall (210); the guide wall (220) surrounds the clearance opening (211) and is arranged at the edge of the clearance opening (211); the air duct wall (120) is connected to the edge of the clearance opening (211) through the guide wall (220); wherein, in a direction from back to front, the guide wall (220) extends obliquely toward a direction close to the center line of the clearance opening (211).

5. The air duct device according to claim 4, characterized in that: A surface of the guide wall (220) close to the clearance opening (211) is a convex arc surface.

6. The air duct device according to claim 4, characterized in that: The outer edge of the vertical wall (210) is folded toward the air duct mounting plate (110) to form a flange (230).

7. The air duct device according to claim 4, characterized in that: A surface of the vertical wall (210) facing away from the air duct mounting plate (110) is a plane.

8. The air duct device according to claim 2, characterized in that: The air duct device further comprises an air outlet grille (400) and an exhaust assembly (500), wherein the air outlet grille (400) is fixedly arranged relative to the air duct component (100), and the air outlet grille (400) is located in front of the air duct component (100); the exhaust assembly (500) comprises an exhaust motor (510) and an exhaust impeller (520), wherein the exhaust motor (510) is mounted on the air outlet grille (400), and the exhaust motor (510) is located in the air duct cavity, wherein the motor shaft of the exhaust motor (510) extends toward the back plate (200), and the exhaust impeller (520) is fixedly sleeved on the motor shaft.

9. The air duct device according to claim 1, characterized in that: The air duct mounting plate (110) is provided with a plurality of openings (111), the plurality of openings (111) are spaced apart in the up-down direction, each opening (111) is surrounded by the air duct wall (120), and the back plate (200) is provided with a plurality of clearance openings (211), the plurality of clearance openings (211) respectively corresponding to the plurality of openings (111).

10. A vertical air conditioner, characterized in that: The invention comprises a shell (020) and an air duct device according to any one of claims 1 to 9, wherein the air duct device is arranged inside the shell (020), and the shell (020) comprises a front panel (021) and a rear panel (022), wherein the front panel (021) is provided with an air supply port connected to the opening (111), and the rear panel (022) is provided with an air inlet connected to the opening (111).

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