CN217141021U

CN217141021U - Tuyere, drying device and coating equipment

Info

Publication number: CN217141021U
Application number: CN202220819467.9U
Authority: CN
Inventors: 张加贝; 贺建军; 谢迟新
Original assignee: Sany Technology Equipment Co Ltd
Current assignee: Sany Technology Equipment Co Ltd
Priority date: 2022-04-08
Filing date: 2022-04-08
Publication date: 2022-08-09
Anticipated expiration: 2032-04-08

Abstract

The utility model provides a tuyere, drying device and coating equipment belongs to pole piece coating technical field, and wherein, the tuyere includes: the first side of the shell is provided with an air inlet; the inner shell sets up in the inside of shell, and the both ends of inner shell are connected with the both ends of shell respectively, form a pair of passageway between shell and the inner shell, and the passageway includes air-out wind channel and wind channel with higher speed, the entry and the air intake intercommunication of passageway to air-out wind channel is the opening in order to form the air outlet in the second side of shell, on the cross section of tuyere, air-out wind channel slope sets up, and along the air-out direction, a pair of air-out wind channel keeps away from the setting gradually, and the wind channel is the convergent structure with higher speed. The utility model provides a pair of tuyere can reduce the mutual disturbance between the air-out air current in a pair of air-out wind channel, reduces tuyere's middle zone and two marginal area's wind speed difference, promotes tuyere holistic air-out homogeneity, guarantees that pole piece different positions department's degree of drying is unanimous, guarantees pole piece drying quality, improves drying efficiency.

Description

Tuyere, drying device and coating equipment

Technical Field

The utility model relates to a pole piece coating technical field, concretely relates to tuyere, drying device and coating equipment.

Background

In the manufacturing process of the battery, the slurry is required to be coated on a base material and then enters a drying device for drying. The air flow for drying the pole piece generally enters the air cavity of the drying device from the single-side air inlet of the drying device and then blows towards the pole piece from the air nozzle. The uniformity of the drying temperature has a great influence on the uniformity of the pole piece, thereby influencing the consistency of the battery. In the prior art, a pair of air outlet ducts are arranged on the air nozzle, and the air outlet ducts are usually obliquely arranged and gradually close to each other along the air outlet direction. Therefore, the air outlet flows of the air outlet channels can be disturbed mutually, so that the air speeds of the middle area and the two edge areas of the air nozzle are different, the drying degrees of different positions of the pole piece are inconsistent, the pole piece is cracked even, the drying quality of the pole piece is influenced, the air flow entering from the air inlet directly flows out through the air outlet channels, the flow rate of the air outlet flow is low, and the drying efficiency is low.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the different position department drying degree inconsistent of pole piece among the prior art, influences the drying quality of pole piece and defect that drying efficiency is low to a tuyere, drying device and coating equipment are provided.

In order to solve the above problem, the utility model provides a tuyere, include: the air conditioner comprises a shell, wherein an air inlet is formed in the first side of the shell; the inner shell, set up in the inside of shell, the both ends of inner shell respectively with the both ends of shell are connected, the shell with form a pair of passageway between the inner shell, the passageway includes air-out wind channel and wind channel with higher speed, the entry of passageway with the air intake intercommunication, and the air-out wind channel is in the second side of shell is the opening in order to form the air outlet on the cross section of tuyere, the slope of air-out wind channel sets up to along the air-out direction, it is a pair of the setting is kept away from gradually to the air-out wind channel, the wind channel is the convergent structure with higher speed.

Optionally, the outer shell includes a shell and a flow guiding body, the flow guiding body is provided with a pair of flow guiding bodies and respectively arranged on two opposite side walls of the shell, the inner shell is arranged between the pair of flow guiding bodies, and a channel is formed between the inner shell and the flow guiding body.

Optionally, the flow guiding body includes a first flow guiding portion and a second flow guiding portion, the inner shell and the first flow guiding portion form the acceleration air duct therebetween, the inner shell and the second flow guiding portion form the air outlet duct therebetween, and the second flow guiding portion is straight and parallel to the side wall of the inner shell.

Optionally, the first flow guiding portion is straight or curved, and/or the side wall of the inner shell is straight or curved.

Optionally, the first diversion portion is a bending structure, and a bending position faces towards the inner shell, the acceleration air duct comprises a first acceleration portion and a second acceleration portion, the first acceleration portion, the second acceleration portion and the air outlet duct are sequentially communicated, and the tapering rate of the first acceleration portion is greater than that of the second acceleration portion.

Optionally, the outer wall of the second side of the outer shell is provided with a horizontal segment, the horizontal segment is located on one side of the air outlet far away from the inner shell, and the horizontal segment is suitable for being arranged in parallel with the pole piece.

Optionally, one side of the horizontal section, which is far away from the air outlet, is connected with a turning section, and the turning section turns towards the first side of the housing.

Optionally, a second through hole is formed in one surface of the inner shell facing the second side of the outer shell; the end face of the outer shell is provided with a first through hole, the first through hole is communicated with the inside of the inner shell, or one end of the inner shell, which is far away from the second side of the outer shell, and/or the side wall of the inner shell is provided with a third through hole, and the third through hole is communicated with the channel.

Optionally, a rectifying structure is further arranged inside the outer shell, and the rectifying structure is arranged on the upstream of the channel.

Optionally, the rectification structure includes a plurality of cowling panel, and a plurality of cowling panel sets up along air-out direction interval, it has seted up a plurality of rectification holes to be array structure on the cowling panel.

The utility model also provides a drying device, including foretell tuyere.

The utility model also provides a coating equipment, including foretell drying device.

The utility model has the advantages of it is following:

1. the utility model provides a pair of tuyere through setting up shell and inner shell to form a pair of air-out wind channel and a pair of wind channel with higher speed between shell and inner shell, and make a pair of air-out wind channel keep away from the setting gradually along the air-out direction, therefore, can reduce the mutual disturbance between the air-out air current of a pair of air-out wind channels, reduce the wind speed difference of the middle zone and both edges region of tuyere, promote the air-out homogeneity of tuyere, guarantee the drying degree of different positions of pole piece is unanimous, guarantee pole piece drying quality; the accelerating air duct is of a gradually-reduced structure, so that the flow velocity of the air outlet flow is gradually increased, and the drying efficiency is improved.

2. The utility model provides a pair of tuyere sets up second water conservancy diversion portion into straight face type and with the lateral wall parallel arrangement of inner shell to the sectional area in air-out wind channel keeps unchangeable on the cross-section of perpendicular to air-out direction, guarantees the stability of air-out air current.

3. The utility model provides a pair of tuyere will accelerate the wind channel and set up to first portion with higher speed and second portion with higher speed to the convergent speed of first portion with higher speed is greater than the convergent speed of second portion with higher speed, consequently, the wind channel with higher speed that sets up in grades can reduce the air current disturbance that leads to because of the wind speed rises, guarantees the homogeneity of air-out wind speed.

4. The utility model provides a pair of tuyere is through setting up the horizontal segment on the outer wall of shell to the horizontal segment parallels with the pole piece, so that the air current tends to be parallel with the pole piece after flowing out from the air outlet, and the air-out air current can stop longer time between tuyere and pole piece, promotes drying efficiency.

5. The utility model provides a pair of tuyere is through connecting a section of turning over in the outside of horizontal segment to the outside water conservancy diversion of a section is turned over in the utilization, is favorable to the gas flow to spread on every side.

6. The utility model provides a pair of tuyere is through setting up first through-hole and second through-hole to inside making outside air can follow first through-hole entering inner shell, near the pole piece is flowed to the rethread second through-hole, perhaps, through setting up second through-hole and third through-hole, inside so that the air current that the air intake got into gets into the inner shell through the third through-hole, flow out from the second through-hole again, with the pressure between balanced tuyere and the pole piece, guarantee the stability of pole piece.

7. The utility model provides a pair of tuyere through set up the rectification structure in the shell to the air current that makes by the air intake entering gradually tends to stably.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a cross-sectional view A-A of FIG. 4;

fig. 2 is a perspective view of a first angle of a tuyere provided in an embodiment of the present invention;

fig. 3 is a perspective view of a second angle of the tuyere provided by the embodiment of the present invention;

FIG. 4 is a front view of FIG. 2;

FIG. 5 is a top view of FIG. 3;

fig. 6 is a schematic structural diagram illustrating a first alternative embodiment of a tuyere provided by an embodiment of the present invention;

fig. 7 is a schematic structural diagram illustrating a second alternative embodiment of a tuyere provided by an embodiment of the present invention;

fig. 8 shows a schematic structural diagram of a third alternative embodiment of a tuyere provided by an embodiment of the present invention;

fig. 9 is a schematic structural diagram illustrating a fourth alternative embodiment of a tuyere provided by an embodiment of the present invention;

fig. 10 shows a schematic structural diagram of a fifth alternative implementation of the tuyere provided by the embodiment of the present invention.

Description of reference numerals:

10. a housing; 11. an air inlet; 12. a housing; 13. a flow conductor; 131. a first flow guide part; 132. a second flow guide part; 14. a horizontal segment; 15. folding sections; 16. a first through hole; 20. an inner shell; 21. a second through hole; 22. a third through hole; 30. an air outlet duct; 31. an air outlet; 40. an acceleration air duct; 41. a first acceleration section; 42. a second acceleration section; 50. a rectifying plate; 51. and (6) rectifying the flow hole.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

One embodiment of the tuyere shown in fig. 1 to 5 includes: the outer shell 10 and the inner shell 20, the inner shell 20 is set in the outer shell 10, and the two ends of the inner shell 20 are connected with the two ends of the outer shell 10 respectively. An air inlet 11 is formed in the first side of the outer shell 10, a pair of channels are formed between the outer shell 10 and the inner shell 20, the channels include an air outlet channel 30 and an acceleration channel 40, inlets of the channels are communicated with the air inlet 11, and the air outlet channel 30 is opened at the second side of the outer shell 10 to form an air outlet 31. On the cross section of tuyere, air-out wind channel 30 slope sets up to along the air-out direction, a pair of air-out wind channel 30 is kept away from gradually and is set up.

It should be noted that, referring to fig. 1, a first side of the housing 10 is an upper side of the housing 10 in fig. 1, and a second side of the housing 10 is a lower side of the housing 10 in fig. 1. Referring to fig. 2 and 3, the tuyere has a long strip-shaped structure, and the cross section of the tuyere is a section perpendicular to the length direction of the tuyere, that is, a section along the vertical direction and perpendicular to the drawing plane in fig. 3. Referring to fig. 1, along the air outlet direction, the air outlet ducts 30 are both disposed obliquely outward.

Through setting up shell 10 and inner shell 20, with form a pair of air-out wind channel 30 between shell 10 and inner shell 20, and make a pair of air-out wind channel 30 keep away from the setting gradually along the air-out direction, consequently, can reduce the mutual disturbance between the air-out air current of a pair of air-out wind channel 30, reduce the wind speed difference in the middle zone and the marginal zone of two of tuyere, promote the holistic air-out homogeneity of tuyere, guarantee that the drying degree of pole piece different positions department is unanimous, guarantee pole piece drying quality.

As shown in fig. 1, the outer casing 10 includes a casing 12 and a baffle 13, the baffle 13 is provided with a pair and is respectively disposed on two opposite sidewalls of the casing 12, the inner casing 20 is disposed between the pair of baffles 13, and the above-mentioned channel is formed between the inner casing 20 and the baffle 13. The accelerating duct 40 is of a tapered structure along the air outlet direction on the cross section of the air nozzle.

It should be noted that, referring to fig. 1, the baffle 13 is a plate connected to the inner wall of the casing 12, and the baffle 13 protrudes toward the inner casing 20 and is spaced apart from the inner casing 20 to form the air outlet duct 30 and the acceleration duct 40. As shown in fig. 1, the acceleration air duct 40 is located above the air outlet duct 30 and is connected to each other, that is, the airflow entering from the air inlet 11 is accelerated through the acceleration air duct 40 and then flows into the air outlet duct 30.

It should be further noted that, the accelerating air duct 40 is of a tapered structure, which means that the sectional area of the accelerating air duct 40 is gradually reduced along the air outlet direction. The sectional area of the acceleration duct 40 refers to the sectional area of the acceleration duct 40 in the direction perpendicular to the air outlet direction, i.e., the sectional area in the transverse direction in fig. 1. Therefore, referring to fig. 1, 6 to 10, the acceleration duct 40 is approximately in the shape of an inverted triangle.

The acceleration air duct 40 with a tapered structure is formed between the flow guide body 13 and the inner shell 20, so that the flow speed of the outlet air flow is gradually increased, and the drying efficiency is improved.

In the present embodiment, as shown in fig. 1, the flow guiding body 13 includes a first flow guiding portion 131 and a second flow guiding portion 132, the acceleration air duct 40 is formed between the inner casing 20 and the first flow guiding portion 131, the air outlet duct 30 is formed between the inner casing 20 and the second flow guiding portion 132, and the second flow guiding portion 132 is straight and parallel to the side wall of the inner casing 20.

It should be noted that, referring to fig. 1, 6 to 10, a straight strip-shaped air outlet slit is formed between the second flow guiding portion 132 and the inner casing 20, that is, the sectional area of the air outlet duct 30 in the direction perpendicular to the air outlet direction is not changed along the air outlet direction.

The second flow guiding portion 132 is arranged to be straight and parallel to the sidewall of the inner casing 20, so that the sectional area of the air outlet duct 30 on the section perpendicular to the air outlet direction remains unchanged, and the stability of the air outlet flow is ensured.

In this embodiment, as shown in fig. 1, the first flow guiding portion 131 is of a bent structure, and the bent portion is disposed toward the inner casing 20, the acceleration duct 40 includes a first acceleration portion 41 and a second acceleration portion 42, the first acceleration portion 41, the second acceleration portion 42 and the air outlet duct 30 are sequentially communicated, and a tapering rate of the first acceleration portion 41 is greater than a tapering rate of the second acceleration portion 42.

It should be noted that the tapering rate refers to a reduction rate of the cross-sectional area of the acceleration duct 40, that is, the ratio of the two cross-sectional areas of the first acceleration portion 41 is greater than the ratio of the two cross-sectional areas of the second acceleration portion 42 at the same interval in the air outlet direction.

The acceleration air duct 40 is provided with the first acceleration part 41 and the second acceleration part 42, and the tapering rate of the first acceleration part 41 is greater than that of the second acceleration part 42, so that the acceleration air duct 40 arranged in stages can reduce airflow disturbance caused by wind speed rise, and ensure uniformity of wind speed of outlet air.

As an alternative embodiment, as shown in fig. 6, the first guide portion 131 is straight-faced, and the corresponding side wall of the inner case 20 is also straight-faced; as shown in fig. 7, the first flow guiding portion 131 is arc-shaped, and the corresponding side wall of the inner shell 20 is straight; as shown in fig. 8, the first flow guiding portion 131 is curved, and the corresponding side wall of the inner casing 20 is also curved.

As shown in fig. 1, the outer wall of the second side of the outer casing 10 is provided with a horizontal section 14, the horizontal section 14 is located on one side of the air outlet 31 away from the inner casing 20, and when drying the pole piece, the horizontal section 14 is parallel to the pole piece.

It should be noted that, referring to fig. 1, the horizontal section 14 is located outside the air outlet 31 and extends outward along the horizontal direction.

Through set up horizontal segment 14 on the outer wall at shell 10 to horizontal segment 14 parallels with the pole piece, so that the air current tends to be parallel with the pole piece after flowing out from air outlet 31, and the air-out air current can stop longer time between tuyere and pole piece, promotes drying efficiency.

As shown in fig. 1, a side of the horizontal section 14 away from the air outlet 31 is connected to a folding section 15, and the folding section 15 is folded toward the first side of the housing 10.

It should be noted that, referring to fig. 1, the outside of the horizontal section 14 is connected with a turning section 15, and the turning section 15 is a straight-surface structure inclined upward.

By connecting the folded sections 15 outside the horizontal section 14, the folded sections 15 are used for guiding the flow outwards, so that the air flow is favorably diffused to the periphery.

As shown in fig. 1 to 5, a first through hole 16 is formed on an end surface of the outer shell 10, the first through hole 16 is communicated with an inside of the inner shell 20, and a second through hole 21 is formed on a surface of the inner shell 20 facing a second side of the outer shell 10, that is, the second through hole 21 is formed on a lower end surface of the inner shell 20 in fig. 1.

It should be noted that, referring to fig. 1, when the pole piece is dried, the air outlet 31 blows air towards the outside, and negative pressure is easily formed between the lower end face of the inner casing 20 and the pole piece, so that the pole piece is easily shaken and even sucked onto the air nozzle to cause scratch. Therefore, by arranging the first through hole 16 and the second through hole 21, the external air can enter the inner shell 20 from the first through hole 16 and then flow to the vicinity of the pole piece through the second through hole 21, so as to balance the pressure between the air nozzle and the pole piece and ensure the stability of the pole piece.

As an alternative embodiment, as shown in fig. 9, a second through hole 21 is opened on a surface of the inner shell 20 facing the second side of the outer shell 10 (on a lower end surface of the inner shell 20 in fig. 9), a third through hole 22 is opened on an end of the inner shell 20 away from the second side of the outer shell 10 (on an upper end of the inner shell 20 in fig. 9), and the third through hole 22 is communicated with the passage; alternatively, as shown in fig. 10, a second through hole 21 is formed on a surface of the inner casing 20 facing the second side of the outer casing 10 (on a lower end surface of the inner casing 20 in fig. 10), a third through hole 22 is formed on a side wall of the inner casing 20, and the third through hole 22 is communicated with the passage. Through setting up second through-hole 21 and third through-hole 22 to make the air current that air intake 11 got into get into inside inner shell 20 through third through-hole 22, flow out from second through-hole 21 again, with the pressure between balanced tuyere and the pole piece, guarantee the stability of pole piece.

As shown in fig. 1 and 2, the interior of the casing 10 is provided with a flow straightening structure disposed upstream of the passage. By arranging the rectifying structure, the airflow entering from the air inlet 11 gradually tends to be stable after being rectified by the rectifying structure.

Specifically, in this embodiment, as shown in fig. 1 and fig. 2, the rectifying structure includes a plurality of rectifying plates 50, the plurality of rectifying plates 50 are disposed at intervals along the air outlet direction, and the array structure on the rectifying plates 50 is provided with a plurality of rectifying holes 51.

In the present embodiment, as shown in fig. 1, two rectifying plates 50 are provided and are vertically spaced, and the upper end of the flow guiding body 13 and the upper end of the inner casing 20 are connected to the rectifying plate 50 located below, so that the air flow rectified by the rectifying plates 50 can directly enter the passage.

In an alternative embodiment, as shown in fig. 9, the third through hole 22 communicates with the rectifying hole 51 located at an intermediate position on the rectifying plate 50 located below.

When the air nozzle of the present embodiment is used, please refer to fig. 1, after the hot air flows into the housing 12 from the air inlet 11, the hot air is rectified by the plurality of rectifying plates 50, flows into the pair of accelerating air ducts 40 which are symmetrical left and right, is accelerated by the first accelerating portion 41 and the second accelerating portion 42, flows into the air outlet duct 30, and flows out from the air outlet 31, so as to dry the pole piece which is arranged corresponding to the air outlet 31; meanwhile, the external air can enter the inner shell 20 from the first through hole 16, then flow to the surface of the pole piece through the second through hole 21, and flow out from the two sides of the air nozzle after being converged with the air flow flowing out from the air outlet 31.

The embodiment also provides a specific implementation mode of the drying device, which comprises the air nozzle. The pole piece is dried by the air nozzle, the difference between the air speeds of the middle area and the two edge areas of the air nozzle is small, and the air outlet uniformity of the whole air nozzle is high, so that the drying degrees of different positions of the pole piece are consistent, the drying quality of the pole piece is high, and the drying efficiency is high.

The embodiment also provides a specific implementation mode of the coating device, which comprises the drying device.

According to the above description, the present patent application has the following advantages:

1. the mutual disturbance between the air outlet flows of the air outlet channels is small, the difference between the air speeds of the middle area and the two edge areas of the air nozzle is small, and the air outlet uniformity of the whole air nozzle is high, so that the drying degrees of different positions of the pole piece are consistent, and the drying quality of the pole piece is high;

2. the acceleration air ducts arranged in a grading manner can reduce airflow disturbance caused by rising of the wind speed, and ensure uniformity of the wind speed of the outlet wind;

3. the pressure between the air nozzle and the pole piece is balanced, and the stability of the pole piece is ensured.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A tuyere, comprising:

the air conditioner comprises a shell (10), wherein an air inlet (11) is formed in the first side of the shell (10);

inner shell (20), set up in the inside of shell (10), the both ends of inner shell (20) respectively with the both ends of shell (10) are connected, shell (10) with form a pair of passageway between inner shell (20), the passageway includes air-out wind channel (30) and acceleration wind channel (40), the entry of passageway with air intake (11) intercommunication, and air-out wind channel (30) are in the second side of shell (10) is opening in order to form air outlet (31) on the cross section of tuyere, air-out wind channel (30) slope sets up to along the air-out direction, it is a pair of air-out wind channel (30) keep away from the setting gradually, acceleration wind channel (40) are the convergent structure.

2. The tuyere according to claim 1, characterized in that the outer casing (10) includes a casing (12) and a flow guide body (13), the flow guide body (13) is provided with a pair and is divided on both side walls opposite to the casing (12), the inner casing (20) is provided between a pair of the flow guide bodies (13), and a passage is formed between the inner casing (20) and the flow guide body (13).

3. The tuyere according to claim 2, wherein the flow guide body (13) includes a first flow guide portion (131) and a second flow guide portion (132), the acceleration air duct (40) is formed between the inner casing (20) and the first flow guide portion (131), the air outlet duct (30) is formed between the inner casing (20) and the second flow guide portion (132), and the second flow guide portion (132) is straight and parallel to a sidewall of the inner casing (20).

4. The tuyere of claim 3, wherein the first flow guiding portion (131) is straight or curved, and/or wherein a sidewall of the inner casing (20) is straight or curved.

5. The tuyere according to claim 3, wherein the first flow guiding portion (131) has a bent structure, and a bent portion is disposed toward the inner casing (20), the acceleration duct (40) includes a first acceleration portion (41) and a second acceleration portion (42), the first acceleration portion (41), the second acceleration portion (42), and the outlet duct (30) are sequentially communicated, and a tapering rate of the first acceleration portion (41) is greater than a tapering rate of the second acceleration portion (42).

6. The tuyere according to any one of claims 1 to 5, characterized in that the outer wall of the second side of the outer shell (10) is provided with a horizontal section (14), the horizontal section (14) being located at a side of the air outlet opening (31) remote from the inner shell (20), the horizontal section (14) being adapted to be arranged in parallel with a pole piece.

7. The tuyere of claim 6, wherein a side of the horizontal section (14) away from the air outlet (31) is connected with a folded section (15), and the folded section (15) is folded towards the first side of the housing (10).

8. The tuyere according to any one of claims 1 to 5, characterized in that a second through hole (21) is formed in a surface of the inner casing (20) facing the second side of the outer casing (10);

the end face of the outer shell (10) is provided with a first through hole (16), the first through hole (16) is communicated with the inside of the inner shell (20), or one end of the inner shell (20) far away from the second side of the outer shell (10) and/or the side wall of the inner shell (20) is provided with a third through hole (22), and the third through hole (22) is communicated with the channel.

9. A tuyere according to any one of claims 1 to 5, characterized in that a flow-straightening structure is further provided inside the casing (10), the flow-straightening structure being provided upstream of the passage.

10. The tuyere according to claim 9, wherein the flow straightening structure includes a plurality of flow straightening plates (50), the plurality of flow straightening plates (50) are spaced apart from each other in the air outlet direction, and a plurality of flow straightening holes (51) are formed in the flow straightening plates (50) in an array structure.

11. A drying apparatus, characterized by comprising the tuyere of any one of claims 1 to 10.

12. A coating apparatus, characterized by comprising the drying device of claim 11.