Air nozzle and air chamber

Abstract

The utility model relates to the technical field of coating equipment, and discloses an air nozzle and an air chamber. The tuyere comprises a shell, an air uniformizing structure, an air guiding structure and a guide roller. An air inlet side and an air outlet side are arranged on two opposite sides of the shell; the air uniformizing structure and the air guiding structure are sequentially arranged in an inner cavity of the shell from the air inlet side to the air outlet side, the inner cavity of the shell comprises an air uniformizing cavity, a flow guiding cavity and a guide roller cavity which are formed by the air uniformizing structure and the air guiding structure in a separated mode, and the air uniformizing cavity is communicated with the flow guiding cavity. The guide roller is arranged on the air outlet side of the guide roller cavity; and the flow guide cavity forms an air outlet which is inwards contracted at two sides of the guide roller on the air outlet side. The air nozzle provided by the utility model can generate an air floatation effect on the pole piece, so that an airflow channel is formed between the air outlet and the pole piece, airflow can be uniformly and intensively blown to the pole piece, the heat exchange efficiency is improved, and the drying process is accelerated. Meanwhile, the energy loss is reduced, and the energy consumption is reduced. And moreover, the pole pieces can be kept flat in the drying process, direct contact between the pole pieces and drying equipment is avoided, and mechanical damage is reduced.

Description

Technical Field

[0001] This utility model relates to the field of coating equipment technology, specifically to air nozzles and air chambers. Background Technology

[0002] The manufacturing process of lithium batteries includes two key steps: electrode coating and drying. After coating, the electrodes are placed in an oven and dried using hot air to remove the solvent from the coating.

[0003] The drying oven has a wind chamber and air nozzles. The wind chamber is an enclosed space inside the oven with air inlets and outlets, used to concentrate and distribute hot air to ensure uniform distribution within the oven. The air nozzles are the hot air outlets of the wind chamber, used to precisely blow hot air onto the electrode sheets, thereby drying the coated electrode sheets.

[0004] In traditional drying ovens, the hot airflow from the nozzles is difficult to form a stable air cushion, resulting in airflow dispersion, which leads to low heat exchange efficiency and affects the drying efficiency of the electrodes. At the same time, when the machine is stopped, the low airflow speed from the nozzles can cause the electrodes to come into contact with the upper surface of the nozzles, resulting in burns. Utility Model Content

[0005] In view of this, the present invention provides a nozzle and a wind chamber to solve the problems of low heat exchange efficiency between the nozzle and the electrode, which affects the drying efficiency of the electrode and causes burns when the electrode contacts the upper surface of the nozzle due to the low airflow speed at standby wind frequency.

[0006] In a first aspect, this utility model provides a nozzle, including a housing, an air distribution structure, an air guiding structure, and a guide roller. The housing has an air inlet side and an air outlet side on opposite sides. From the air inlet side to the air outlet side, the air distribution structure and the air guiding structure are sequentially arranged in the inner cavity of the housing. The inner cavity of the housing includes an air distribution cavity, a flow guiding cavity, and a guide roller cavity formed by the air distribution structure and the air guiding structure, with the air distribution cavity communicating with the flow guiding cavity. The guide roller is located on the air outlet side of the guide roller cavity. The flow guiding cavity forms an air outlet on the air outlet side that is recessed on both sides of the guide roller, and the top of the guide roller is higher than the air outlet.

[0007] Beneficial Effects: The air nozzle provided in this embodiment of the invention features an air-uniforming structure within its housing. This structure is located within the inner cavity of the housing, between the air inlet side and the air guide structure. The main function of the air-uniforming structure is to homogenize the airflow entering from the air inlet side. This helps eliminate turbulence and unevenness in the airflow, making the airflow more stable and ensuring a uniform distribution of airflow entering the air guide cavity. The air-uniforming cavity is the chamber formed between the air inlet of the air nozzle and the air-uniforming structure. Gas enters the inner cavity of the housing from the air inlet and directly enters the air-uniforming cavity, where the air-uniforming structure achieves a uniform distribution of the airflow.

[0008] An air guide structure is installed inside the housing, positioned between the air distribution structure and the guide rollers. Its primary function is to direct the homogenized airflow towards the outlet. The design of the air guide structure ensures that the airflow follows a predetermined path to the outlet, minimizing airflow loss and dispersion. The guide cavity is a chamber formed between the air distribution structure and the air guide structure, within which the gas is guided towards the outlet.

[0009] The guide roller cavity is a chamber formed on the side of the airflow guiding structure away from the inner wall of the housing, and the guide roller is located on the air outlet side of the guide roller cavity. The function of the guide roller is to support and guide the electrode sheets, ensuring that the electrode sheets can move smoothly under the action of airflow.

[0010] The air outlets, recessed on both sides of the guide rollers, concentrate the airflow at the outlets, forming a stable air cushion that lifts and suspends the electrode sheets. This improves the concentration and stability of the airflow and reduces its diffusion. The nozzle provided by this invention creates an air-floating effect on the electrode sheets, forming an airflow channel between the outlet and the electrode sheets. The airflow is then evenly and concentratedly directed towards the electrode sheets, improving heat exchange efficiency and accelerating the drying process. Simultaneously, the concentrated nature of the recessed airflow allows for more efficient heat transfer, reducing unnecessary energy loss and thus lowering energy consumption. Furthermore, the air-floating effect of the nozzle helps keep the electrode sheets flat during drying, preventing direct contact with the drying equipment and reducing mechanical damage.

[0011] In one alternative embodiment, the air guiding structure is a semi-enclosed structure arranged circumferentially around the guide roller, from the air inlet side to the air outlet side, and the flow area of ​​the guide cavity gradually decreases.

[0012] In one optional embodiment, the air guiding structure includes a base plate disposed below the guide roller, two first guide side plates respectively connected to the two sides of the base plate, and two second guide side plates respectively connected to the two first guide side plates. The two first guide side plates are distributed in an outwardly expanding inclined manner, and the two second guide side plates are distributed in an inwardly contracting inclined manner.

[0013] In one optional implementation, the air outlet angle between the second guide plate and the horizontal direction is α, where 25°≤α≤50°.

[0014] In one optional embodiment, the air guiding structure further includes two third guide side plates, which are respectively disposed on both sides of the guide roller and connected between the first guide side plate and the second guide side plate.

[0015] In one alternative embodiment, the air distribution structure includes an air distribution plate that extends along the length of the guide roller and has a plurality of evenly arranged ventilation holes.

[0016] In one alternative embodiment, an air inlet is provided on the air inlet side of the housing, and the opening area of ​​the air inlet is smaller than the area of ​​the air distribution plate.

[0017] In one alternative embodiment, the housing has a quick-release structure on the air inlet side, and the housing is adapted to be connected to the air chamber via the quick-release structure.

[0018] In one alternative embodiment, the quick-release structure includes a fixing pin and a resilient hook located at opposite ends along the length of the housing. The fixing pin is adapted to be inserted into the mounting hole of the air chamber, and the resilient hook is adapted to be engaged with the snap-fit ​​of the air chamber.

[0019] Secondly, this utility model also provides a wind chamber, including a housing and at least one air nozzle as described in the technical solution, wherein one side of the housing is the air outlet side; the air nozzle is disposed in the housing, with the air inlet side of the air nozzle facing the air outlet side of the housing.

[0020] Beneficial effects: Since the air chamber includes the air nozzle, it has the same effect as the air nozzle, which will not be elaborated here. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art 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.

[0022] Figure 1 This is a front view of a nozzle according to an embodiment of the present utility model;

[0023] Figure 2 for Figure 1 The top view of the air nozzle shown;

[0024] Figure 3 for Figure 1 The top view of the air nozzle shown;

[0025] Figure 4 for Figure 1 The side view of the air nozzle shown;

[0026] Figure 5 for Figure 2 Sectional view at point AA along the middle;

[0027] Figure 6 This is a schematic diagram showing the airflow direction in the nozzle;

[0028] Figure 7 for Figure 1 The image shows a bottom view of the air distribution structure in the nozzle.

[0029] Figure 8 A top view of a ventilation chamber provided for an embodiment of this utility model;

[0030] Figure 9 for Figure 8 The front view of the ventilation chamber is shown.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10. Nozzle; 11. Housing; 111. Air inlet; 112. Air outlet; 12. Air distribution structure; 121. Air distribution plate; 122. Ventilation hole; 13. Air guide structure; 131. Base plate; 132. First guide side plate; 133. Second guide side plate; 134. Third guide side plate; 14. Guide roller; 15. Air distribution cavity; 16. Guide cavity; 17. Guide roller cavity; 18. Quick disassembly structure; 181. Fixing pin; 182. Elastic hook; 19. Handle; 20. Housing; 100. Air chamber; 200. Electrode. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] The following is combined Figures 1 to 9 The following describes embodiments of the present invention.

[0035] According to an embodiment of the present invention, in a first aspect, a nozzle 10 is provided, comprising a housing 11, an air distribution structure 12, an air guide structure 13, and a guide roller 14. The housing 11 has an air inlet side and an air outlet side on opposite sides; the air distribution structure 12 and the air guide structure 13 are sequentially disposed within the inner cavity of the housing 11 from the air inlet side towards the air outlet side. The inner cavity of the housing 11 includes an air distribution cavity 15, a flow guide cavity 16, and a guide roller cavity 17 formed by the air distribution structure 12 and the air guide structure 13, wherein the air distribution cavity 15 and the flow guide cavity 16 are connected; the guide roller 14 is disposed on the air outlet side of the guide roller cavity 17; the flow guide cavity 16 forms an air outlet 112 on the air outlet side that is recessed on both sides of the guide roller 14, and the top of the guide roller 14 is higher than the air outlet 112.

[0036] The nozzle 10 provided in this embodiment of the utility model:

[0037] An air-uniformity structure 12 is provided inside the housing 11. Located within the inner cavity of the housing 11, between the air inlet side and the air guide structure 13, the main function of the air-uniformity structure 12 is to homogenize the airflow entering from the air inlet side. This helps eliminate turbulence and unevenness in the airflow, making the airflow more stable and ensuring a uniform distribution of airflow entering the air guide cavity 16. The air-uniformity cavity 15 is the chamber formed between the air inlet 111 of the nozzle 10 and the air-uniformity structure 12. Gas enters the inner cavity of the housing 11 from the air inlet 111 and directly enters the air-uniformity cavity 15, where the air-uniformity structure 12 achieves a uniform distribution of the airflow.

[0038] An air guide structure 13 is provided inside the housing 11, positioned between the air distribution structure 12 and the guide roller 14. Its main function is to guide the homogenized airflow towards the air outlet 112. The design of the air guide structure 13 guides the airflow along a predetermined path to the air outlet 112, reducing airflow loss and dispersion. The flow guide cavity 16 is a chamber formed between the air distribution structure 12 and the air guide structure 13. Within the flow guide cavity 16, the gas forms a guided airflow that moves towards the air outlet 112.

[0039] The guide roller cavity 17 is a chamber formed on the side of the airflow guiding structure away from the inner wall of the housing 11, and the guide roller 14 is located on the air outlet side of the guide roller cavity 17. The function of the guide roller 14 is to support and guide the electrode 200, ensuring that the electrode 200 can move smoothly under the action of airflow.

[0040] The air outlet 112, which is recessed on both sides of the guide roller 14, is designed to concentrate the airflow at the air outlet 112, forming a stable air cushion that lifts and suspends the electrode 200. This helps improve the concentration and stability of the airflow and reduces airflow diffusion. The nozzle 10 provided by this invention can produce an air flotation effect on the electrode 200, forming an airflow channel between the air outlet 112 and the electrode 200. The airflow can be blown evenly and concentrated onto the electrode 200, improving heat exchange efficiency and accelerating the drying process. At the same time, the concentrated characteristic of the recessed airflow allows the hot air to transfer heat more effectively, reducing unnecessary energy loss and thus reducing energy consumption. In addition, the air flotation effect produced by the nozzle 10 on the electrode 200 helps the electrode 200 remain flat during the drying process, avoiding direct contact with the drying equipment and reducing mechanical damage.

[0041] To address the technical problem that, during shutdown, the low airflow speed from the nozzle during standby mode may cause the electrode to contact the upper surface of the nozzle, potentially resulting in burns, this embodiment of the invention places the top of the guide roller 14 above the air outlet 112. The guide roller 14 provides support for the electrode 200, ensuring that it does not directly contact the upper surface of the nozzle 10 during low airflow speeds or shutdown, thus preventing burns from contact with the high-temperature nozzle 10. Simultaneously, the guide roller 14 also guides the electrode 200, maintaining a stable position as it passes through the nozzle 10 area.

[0042] In some embodiments, refer to Figure 5 , combined Figure 6 The air guiding structure 13 is a semi-enclosed structure arranged circumferentially around the guide roller 14, and the flow area of ​​the guide cavity 16 gradually decreases from the air inlet side to the air outlet side.

[0043] The air guiding structure 13 adopts a semi-enclosed structure surrounding the guide roller 14, which can more effectively guide the airflow from bottom to top along the circumference of the guide roller 14. This structure reduces the lateral diffusion of the airflow, making the airflow more concentrated. At the same time, the flow area of ​​the guide cavity 16 gradually decreases from the air inlet side to the air outlet side, which further enhances the concentration of the airflow. As the flow area decreases, the airflow velocity gradually increases, thereby forming a stronger airflow impact force, making the airflow at the air outlet 112 more concentrated, forming a more stable air cushion, blowing up and suspending the electrode 200, ensuring the air flotation effect of the nozzle 10 on the electrode 200.

[0044] In some embodiments, refer to Figure 5 The air guiding structure 13 includes a base plate 131 located below the guide roller 14, two first guide side plates 132 connected to the two sides of the base plate 131 respectively, and two second guide side plates 133 connected to the two first guide side plates 132 respectively. The two first guide side plates 132 are distributed in an outwardly expanding inclined manner, and the two second guide side plates 133 are distributed in an inwardly contracting inclined manner.

[0045] Specifically, the two first guide side plates 132 are distributed outwardly at an inclined angle, which can effectively diffuse the airflow to both sides of the guide roller 14 and initially guide the direction of the airflow. The two second guide side plates 133 are distributed inwardly at an inclined angle. Since the second guide side plates 133 are close to the air outlet 112, they can gradually reduce the flow area of ​​the airflow in the guide cavity 16, making the flow of the airflow from the guide cavity 16 to the air outlet 112 more concentrated and stable.

[0046] In some embodiments, the air outlet angle between the second guide side plate 133 and the horizontal direction is α, where 25°≤α≤50°.

[0047] The air outlet angle between the second guide plate 133 and the horizontal direction is set between 25° and 50°. This angle range can effectively adjust the direction of airflow and ensure that a stable air flotation area is formed between the airflow and the guide roller 14. Figure 6 The area shown at point B. A higher air outlet angle (e.g., 50°) allows for a larger angle between the airflow and the surface of the electrode 200, enhancing the impact force of the airflow and improving the air flotation effect and drying efficiency. A lower air outlet angle (e.g., 25°) ensures a wider coverage area of ​​the airflow on the surface of the electrode 200, resulting in a more uniform airflow distribution. Setting the air outlet angle between the second guide plate 133 and the horizontal direction between 25° and 50° ensures that the air outlet velocity of the nozzle 10, drying efficiency, electrode 200 tension, and electrode 200 operational stability all achieve good results. In this embodiment, α = 40°.

[0048] In some embodiments, the air guiding structure 13 further includes two third guide side plates 134, which are respectively disposed on both sides of the guide roller 14 and connected between the first guide side plate 132 and the second guide side plate 133.

[0049] Specifically, the third guide plate 134 is disposed on both sides of the guide roller 14 and connected between the first guide plate 132 and the second guide plate 133, which can further optimize the airflow path. The third guide plate 134 can reduce the turbulence and fluctuation of the airflow during the guiding process, making the airflow in the area of ​​the guide roller 14 smoother and more stable.

[0050] In some embodiments, the air distribution structure 12 includes an air distribution plate 121, which extends along the length of the guide roller 14 and has a plurality of evenly arranged ventilation holes 122.

[0051] Specifically, the ventilation holes 122 evenly arranged on the air distribution plate 121 can ensure that the airflow is evenly dispersed when passing through the air distribution plate 121, making the airflow more evenly distributed along the entire length of the guide roller 14, avoiding local airflow that is too strong or too weak, and making the airflow more evenly cover the entire surface of the electrode 200.

[0052] Furthermore, the air distribution plate 121 has flanges on both sides along its length, and the flanges abut against the inner wall of the housing 11. The flanges facilitate the connection between the air distribution plate 121 and the housing 11.

[0053] In some embodiments, an air inlet 111 is provided on the air inlet side of the housing 11, and the opening area of ​​the air inlet 111 is smaller than the area of ​​the air distribution plate 121.

[0054] Because the opening area of ​​the air inlet 111 is small, while the area of ​​the air distribution plate 121 is large, when the airflow enters the larger air distribution plate 121 through the smaller air inlet 111, the airflow speed will decrease. The airflow enters the air distribution cavity 15 from the air inlet 111, and the airflow flow area increases, which helps to improve the airflow diffusion effect, so that the airflow is evenly distributed on the air distribution plate 121 and improves the air distribution effect.

[0055] Furthermore, the flow area of ​​the air distribution cavity 15 increases from the air inlet 111 toward the air distribution plate 121.

[0056] Furthermore, from the air inlet 111 toward the air distribution plate 121, the flow area of ​​the air distribution cavity 15 increases in a stepped manner. Specifically, the step-like increase in the gas flow area of ​​the air distribution cavity 15 can be achieved by setting the housing 11 into a stepped structure.

[0057] In some embodiments, the length of the guide roller 14 is greater than the width of the electrode sheet 200 to be dried. This ensures that the entire surface of the electrode sheet 200 is subjected to the airflow blown out by the nozzle 10, thus ensuring the air flotation effect.

[0058] In some embodiments, the housing 11 is provided with a quick-release structure 18 on the air inlet side, and the housing 11 is adapted to be connected to the air chamber 100 through the quick-release structure 18.

[0059] By incorporating a quick-release structure 18 on the air inlet side of the housing 11, the housing 11 can be quickly connected and disassembled with the air chamber 100. This design significantly improves the ease of maintenance, flexibility, and safety of the equipment, reduces downtime, facilitates inspection and debugging, lowers installation difficulty, and supports equipment upgrades and modifications. These combined technological advantages make the equipment more efficient, reliable, and convenient in practical applications.

[0060] In some embodiments, the quick-release structure 18 includes a fixing pin 181 and an elastic hook 182 located at opposite ends of the housing 11 along its length. The fixing pin 181 is adapted to be inserted into the mounting hole of the air chamber 100, and the elastic hook 182 is adapted to be engaged with the snap fastener of the air chamber 100.

[0061] Specifically, the design of the retaining pin 181 and the elastic hook 182 allows the housing 11 to be quickly connected to or separated from the air chamber 100. The operator simply inserts the retaining pin 181 into the mounting hole of the air chamber 100 and presses the elastic hook 182 to engage with the snap-fit ​​mechanism of the air chamber 100 to complete the installation. For disassembly, simply press the elastic hook 182 to disengage it and then pull out the retaining pin 181. This rapid installation and disassembly method significantly saves time in maintaining and replacing the housing 11, improving work efficiency.

[0062] In some embodiments, a handle 19 is provided on the outer side wall of the housing 11. This facilitates the removal of the nozzle 10 when it is being installed or removed.

[0063] Furthermore, a handle 19 is located on one side wall of the housing 11 near the resilient latch 182. This facilitates the operator in inserting and removing the retaining pin 181.

[0064] According to an embodiment of the present invention, in a second aspect, a wind chamber 100 is also provided, including a housing 20 and at least one air nozzle 10 as described in one or more embodiments, wherein one side of the housing 20 is the air outlet side; the air nozzle 10 is disposed on the housing 20, and the air inlet side of the air nozzle 10 faces the air outlet side of the housing 20.

[0065] The air chamber 100 provided by this utility model includes the air nozzle 10 from the above embodiments. The airflow generated by the air nozzle 10 converges inward, forming an air flotation effect, thereby blowing the electrode 200 up and suspending it. In this state, the gas forms a heat flow channel between the electrode 200, promoting heat exchange, improving drying efficiency, and increasing production efficiency. At the same time, it ensures that the electrode 200 is heated evenly across its entire surface, avoiding problems such as localized overheating or uneven drying.

[0066] Traditional drying methods are energy-intensive, increasing production costs. Air flotation drying technology, through efficient heat exchange and uniform heat distribution, reduces energy waste and lowers energy consumption, thereby reducing production costs.

[0067] Furthermore, traditional drying methods can easily cause deformation or damage to the thin and soft electrode 200. Air flotation drying technology, by blowing the electrode 200 into suspension, avoids direct contact between the electrode 200 and the drying equipment, reducing mechanical damage and protecting the integrity and performance of the electrode 200.

[0068] Since the air chamber 100 includes the air nozzle 10, it has all the technical effects of the air nozzle 10, and the other effects will not be described in detail here.

[0069] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A type of air nozzle, characterized in that, include: The housing (11) has an air inlet side and an air outlet side on opposite sides; The air distribution structure (12) and the air guide structure (13) are arranged from the air inlet side to the air outlet side. The air distribution structure (12) and the air guide structure (13) are arranged sequentially in the inner cavity of the shell (11). The inner cavity of the shell (11) includes an air distribution cavity (15), a flow guide cavity (16) and a guide roller cavity (17) formed by the air distribution structure (12) and the air guide structure (13). The air distribution cavity (15) is connected to the flow guide cavity (16). Guide roller (14) is located on the air outlet side of the guide roller cavity (17); the air outlet cavity (16) forms an air outlet (112) on the air outlet side that is recessed on both sides of the guide roller (14), and the top of the guide roller (14) is higher than the air outlet (112).

2. The nozzle according to claim 1, characterized in that, The air guiding structure (13) is a semi-enclosed structure arranged circumferentially around the guide roller (14), with the air inlet side facing the air outlet side, and the flow area of ​​the guide cavity (16) gradually decreases.

3. The nozzle according to claim 2, characterized in that, The air guiding structure (13) includes a base plate (131) located below the guide roller (14), two first guide side plates (132) connected to the two sides of the base plate (131) respectively, and two second guide side plates (133) connected to the two first guide side plates (132) respectively. The two first guide side plates (132) are distributed in an outwardly expanding inclined manner, and the two second guide side plates (133) are distributed in an inwardly contracting inclined manner.

4. The nozzle according to claim 3, characterized in that, The air outlet angle between the second guide side plate (133) and the horizontal direction is α, 25°≤α≤50°.

5. The nozzle according to claim 3 or 4, characterized in that, The air guiding structure (13) also includes two third guide side plates (134), which are respectively disposed on both sides of the guide roller (14) and connected between the first guide side plate (132) and the second guide side plate (133).

6. The nozzle according to any one of claims 1 to 4, characterized in that, The uniform air structure (12) includes a uniform air plate (121), which extends along the length of the guide roller (14) and has a plurality of uniformly arranged ventilation holes (122).

7. The nozzle according to claim 6, characterized in that, An air inlet (111) is provided on the air inlet side of the housing (11), and the opening area of ​​the air inlet (111) is smaller than the area of ​​the air distribution plate (121).

8. The nozzle according to any one of claims 1 to 4, characterized in that, The housing (11) is provided with a quick-release structure (18) on the air inlet side, and the housing (11) is adapted to be connected to the air chamber (100) through the quick-release structure (18).

9. The nozzle according to claim 8, characterized in that, The quick-release structure (18) includes a fixing pin (181) and an elastic hook (182) located at opposite ends of the length of the housing (11). The fixing pin (181) is adapted to be inserted into the mounting hole of the air chamber (100), and the elastic hook (182) is adapted to be snapped into the buckle of the air chamber (100).

10. A ventilation chamber, characterized in that, include: The housing (20) has one side as the air outlet side; At least one air nozzle (10) according to any one of claims 1 to 9, the air nozzle (10) being disposed on the housing (20), the air inlet side of the air nozzle (10) facing the air outlet side of the housing (20).

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