Air fryer
By introducing hot air circulation components and air guide components into the air fryer, the circulation path of hot air within the fryer is optimized, solving the problem of unsatisfactory heat circulation efficiency and achieving more uniform food heating and a longer lifespan for the equipment.
Patent Information
- Application Number
- CN202520420694.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-11
AI Technical Summary
The heat circulation efficiency of existing air fryers is not ideal, which can easily lead to localized overheating and affect the cooking results.
The design employs a hot air circulation assembly, baffle plate, and air guide assembly. Through the combination of air inlet, air outlet, outer shell ventilation opening, and inner shell circulation hole, hot air can be effectively circulated and evenly distributed within the fryer cavity.
It improves the heat circulation efficiency of the air fryer, reduces the probability of local overheating, enhances the uniformity and efficiency of food heating, and extends the service life of the equipment.
Smart Images

Figure CN223873791U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of kitchen appliances, in particular to an air fryer. BACKGROUND
[0002] In recent years, air fryers have been widely used and developed as a convenient and efficient cooking device. It realizes the rapid heating and surface crispness of food through high-speed circulating hot air, greatly enriching the dietary choices of modern families. Air fryers are not only easy to operate and clean, but also more healthy and environmentally friendly than traditional frying methods, reducing oil intake and meeting people's demand for a healthy lifestyle.
[0003] In order to improve the heating efficiency and uniformity of the air fryer, many air fryers currently set high-power fans or open ventilation holes on the basket to improve the circulation of hot air in the air fryer. However, the heat circulation efficiency of the above-mentioned air fryer is not ideal, and local overheating in the air fryer is prone to occur, affecting the cooking effect.
[0004] In view of the related technology in the above, the present application provides an air fryer. Practical new type content
[0005] In order to improve the heat circulation efficiency in the air fryer, the present application provides an air fryer.
[0006] The air fryer provided by the present application adopts the following technical scheme:
[0007] An air fryer, comprising a fryer main body, a basket arranged in the fryer main body, and a hot air circulation assembly installed in the inner cavity of the fryer main body; the fryer main body is provided with an air inlet and an air outlet, and the fryer main body is provided with a baffle plate at the hot air circulation assembly; the fryer main body further has a placement cavity for arranging the basket, the basket comprises an outer shell and an inner shell, the inner shell and the outer shell have a ventilation gap therebetween, the outer shell is provided with a ventilation hole on the side facing the hot air circulation assembly, the bottom of the inner shell is provided with a first circulation hole, and the side of the inner shell away from the hot air circulation assembly is provided with a second circulation hole; the baffle plate is further provided with a wind guide assembly for guiding hot air to the basket.
[0008] By adopting the technical scheme, in the operation process of the air fryer, the hot air circulation assembly can input the cold air in the outer cavity of the fryer body to the inner cavity of the fryer body and heat it, so that the hot air can circulate in the inner cavity of the fryer body. By opening the ventilation hole on the outer shell and setting the first circulation hole and the second circulation hole on the inner shell, part of the hot air can enter the ventilation gap and continuously circulate in the fry basket, thereby heating the food in the fry basket and reducing the occurrence of local high temperature in the fry basket. The air guide assembly on the blocking plate can be partially located in the hot air on the top of the arrangement chamber, and drive the hot air to flow towards the fry basket, thereby improving the heating efficiency of the food.
[0009] Optionally, the inner cavity bottom surface of the outer shell is provided with a mounting seat, the inner shell has a mounting groove matched with the mounting seat, and the top surface of the inner shell extends towards the outer shell and is provided with a limiting flange abutting against the outer shell.
[0010] By adopting the above technical scheme, the cooperation between the mounting seat on the outer shell and the mounting groove on the inner shell enables the inner shell to be stably fixed in the outer shell, thereby reducing the probability of movement of the inner shell during the operation of the air fryer. The limiting flange on the top of the inner shell helps to reduce the probability of food residues entering the ventilation gap during cooking.
[0011] Optionally, the hot air circulation assembly comprises a driving motor, a first fan connected to the output shaft of the driving motor, a second fan connected to the output shaft of the driving motor and located on the side of the first fan facing the fry basket, and a heating element located between the second fan and the fry basket. The fryer body is provided with a motor bracket for arranging the driving motor, and the blocking plate is arranged between the first fan and the second fan.
[0012] By adopting the above technical scheme, the specific structure of the hot air circulation assembly is disclosed. In the operation process of the hot air circulation assembly, the driving motor drives the rotation of the first fan, thereby inputting the cold air in the outer cavity of the fryer body to the inner cavity of the fryer body. Then, the heating element heats the cold air. Finally, the driving motor drives the rotation of the second fan, thereby diffusing the hot air to the inner cavity of the fryer body, which helps to improve the heating efficiency of the food.
[0013] Optionally, the second fan is a centrifugal fan, the blocking plate is provided with a guide plate for guiding the hot air output from the second fan into the fry basket, and the guide plate is obliquely arranged on the top of the second fan.
[0014] By adopting the technical scheme, the second fan is a centrifugal fan, which can effectively improve the flow efficiency of hot air in the inner cavity of the fryer main body, enhance the hot air circulation capacity, and thus improve the heating uniformity and cooking speed of food. The flow guide plate arranged on the blocking plate can further optimize the hot air flow path, so that the hot air more concentratedly enters the inner cavity of the fry basket, thereby helping the uniform heating of food.
[0015] Optionally, the blocking plate comprises an upper blocking portion arranged on the top surface of the fry basket, and the air guide assembly is arranged on the bottom surface of the upper blocking portion; the air guide assembly comprises a first air guide plate obliquely arranged on the upper blocking portion, a second air guide plate obliquely arranged on the upper blocking portion and inclined away from the first air guide plate, and a third air guide plate arranged on the first air guide plate and parallel to the motor frame; the first air guide plate and the second air guide plate are arranged opposite to the flow guide plate, and the first air guide plate has a mounting portion for mounting the third air guide plate.
[0016] By adopting the technical scheme, the specific structure of the air guide assembly is disclosed, and by the opposite arrangement of the first air guide plate and the second air guide plate and the flow guide plate, when the second fan drives the hot air to flow to the flow guide plate, the flow guide plate guides the hot air to output between the first air guide plate and the second air guide plate, and the third air guide plate can block part of the hot air located between the first air guide plate and the second air guide plate and drive them to transport towards the fry basket, thereby improving the heating efficiency of food.
[0017] Optionally, the fryer main body comprises a fryer back plate, and the fryer back plate is provided with a flow guide groove recessed towards the hot air circulation assembly at the opening of the air inlet, and the air inlet is arranged on the top surface of the flow guide groove.
[0018] By adopting the technical scheme, the flow guide groove provided at the air inlet of the fryer back plate helps to guide the cold air in the outer cavity of the fryer main body into the inner cavity of the fryer main body, improve the flow efficiency and uniformity of air, and thus improve the heating effect and cooking quality of food. At the same time, the design of the flow guide groove also helps to reduce the probability of external dust and other impurities entering the fryer main body, thereby keeping the equipment clean.
[0019] Optionally, the blocking plate divides the inner cavity of the fryer main body into a cold air channel and a hot air channel, the first fan is arranged in the cold air channel, and the second fan is arranged in the hot air channel.
[0020] By adopting the technical scheme, the inner cavity of the deep fryer main body is divided into the hot air channel and the cold air channel by the partition plate, and effective separation of the hot air and the cold air is realized. The first fan is arranged in the cold air channel, can effectively inhale external cold air and deliver the cold air to the hot air channel for heating by the heating member; and the second fan is arranged in the hot air channel, can make the heated hot air flow uniformly distributed into the deep fryer basket, thereby improving the heating efficiency and the heating uniformity of food.
[0021] Optionally, the deep fryer back plate is provided with a mounting hole on one side of the air inlet, and the deep fryer back plate is provided with an exhaust member at the mounting hole, and the exhaust member has an exhaust passage communicating with the cold air channel, the hot air channel and the outer cavity of the deep fryer main body.
[0022] By adopting the technical scheme, the deep fryer main body is provided with the exhaust member on one side of the air inlet, and the exhaust member has the exhaust passage communicating with the hot air channel, the cold air channel and the outer cavity of the deep fryer main body, so that the hot air output from the hot air channel can be cooled in the cold air channel and then output to the outer cavity of the deep fryer main body, thereby reducing the probability of scalding the user by the output hot air. At the same time, the exhaust passage can also effectively exhaust excess heat and waste gas, prevent the equipment from overheating, and prolong the service life of the air fryer.
[0023] Optionally, the arrangement chamber and the inner cavity bottom surface of the deep fryer main body have a cooling gap, and the cooling gap communicates with the cold air channel, the air outlet is arranged on the bottom surface of the deep fryer main body, and the outer side wall bottom of the deep fryer main body is further provided with a mounting leg.
[0024] By adopting the technical scheme, the arrangement of the cooling gap and the arrangement of the cooling gap communicating with the cooling channel help to reduce the influence of the heat generated during the cooking process of the air fryer on the bottom of the air fryer, and improve the service life of the air fryer. The bottom surface of the deep fryer main body is provided with the air outlet penetrating the inner and outer cavities, which can ensure smooth air circulation in the cold air channel and further improve the heat dissipation effect. In addition, the mounting leg arranged on the outer bottom not only increases the stability of the product, but also helps to keep the air outlet unobstructed and enhances the overall use experience.
[0025] Optionally, the inner cavity of the deep fryer main body has two arrangement chambers for arranging the deep fryer basket, and the two arrangement chambers are independent of each other, and one arrangement chamber corresponds to one set of hot air circulation assemblies and one partition plate.
[0026] By adopting the technical scheme, the arrangement of the two arrangement cavities in the air fryer main body helps to improve the flexibility of the air fryer, and the arrangement of one arrangement cavity corresponding to one set of hot air circulation assembly and one baffle helps to control the cooking temperature of the food in different arrangement cavities and helps to make the temperature distribution in the air basket more uniform, so that the heating of the food can be more uniform
[0027] In summary, the present application includes at least one of the following beneficial technical effects:
[0028] 1. An air fryer, by hot air circulation assembly, cold air in the outer cavity of the air fryer main body is input into the inner cavity of the air fryer main body and heated and diffused, and the arrangement of the vent on the outer shell and the first circulation hole and the second circulation hole on the inner shell helps to improve the circulation of hot air on the air basket, thereby improving the heat circulation efficiency of the air fryer, reducing the probability of local overheating in the air fryer, and the arrangement of the air guide assembly helps to improve the heating efficiency of the food;
[0029] 2. The stable installation of the inner shell in the outer shell is realized by the cooperation between the mounting seat and the mounting groove, and the arrangement of the limiting flange on the inner shell helps to reduce the probability of food residues entering the ventilation gap during cooking;
[0030] 3. The arrangement of the second fan as a centrifugal fan helps to improve the flow rate of hot air in the inner cavity of the air fryer main body, thereby improving the circulation efficiency of hot air in the inner cavity of the air fryer main body. BRIEF DESCRIPTION OF DRAWINGS
[0031] Figure 1 is a cross-sectional schematic view of the air fryer in the embodiment of the present application.
[0032] Figure 2 is Figure 1 is a local enlarged schematic view of A in
[0033] Figure 3 is a schematic view of the cooperation of the baffle and the hot air circulation assembly in the embodiment of the present application.
[0034] Figure 4 is a structural schematic view of the air fryer back plate in the embodiment of the present application.
[0035] Figure 5 is a schematic view of the cooperation of the outer shell and the inner shell of the air basket in the embodiment of the present application.
[0036] Figure 6 is a cross-sectional schematic view of the cooperation of the outer shell and the inner shell in the embodiment of the present application.
[0037] Figure 7 is a structural schematic view of the air guide assembly in the embodiment of the present application.
[0038] Figure 8 This is a schematic diagram of the exhaust component and the fryer body in an embodiment of this application.
[0039] Explanation of reference numerals in the attached drawings: 1. Fryer body; 11. Motor frame; 12. Baffle plate; 121. Guide plate; 122. Upper baffle; 13. Cold air passage; 14. Hot air passage; 15. Main shell; 151. Air outlet; 16. Fryer back plate; 161. Air inlet; 162. Guide groove; 163. Mounting hole; 164. Exhaust component; 1641. Exhaust passage; 17. Arrangement chamber; 18. Cooling gap; 19. Mounting legs; 2. Frying basket; 21. Outer shell 211. Body; 212. Mounting base; 212. Ventilation opening; 22. Inner shell; 221. Mounting groove; 222. First circulation hole; 223. Second circulation hole; 224. Limiting flange; 23. Ventilation gap; 3. Hot air circulation assembly; 31. Drive motor; 32. First fan; 33. Second fan; 34. Heating element; 4. Air guide assembly; 41. First air guide plate; 411. Mounting part; 42. Second air guide plate; 43. Third air guide plate; 44. Guide gap. Detailed Implementation
[0040] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail.
[0041] This application discloses an air fryer. (Refer to...) Figure 1 and Figure 2 An air fryer includes an air fryer body 1, a frying basket 2 disposed within the inner cavity of the air fryer body 1, and a hot air circulation assembly 3 installed within the inner cavity of the air fryer body 1. The hot air circulation assembly 3 includes a drive motor 31, a first fan 32 connected to the output shaft of the drive motor 31, a second fan 33 connected to the output shaft of the drive motor 31 and located on the side of the first fan 32 facing the frying basket 2, and a heating element 34 disposed between the second fan 33 and the frying basket 2. The air fryer body 1 has a motor frame 11 for accommodating the drive motor 31. The motor frame 11 is fixed to the air fryer body 1 by screws, with one end abutting against the top surface of the inner cavity of the air fryer body 1 and the other end abutting against the bottom surface of the inner cavity of the air fryer body 1.
[0042] Reference Figure 1 and Figure 3, the fryer main body 1 is provided with a blocking plate 12 between the first fan 32 and the second fan 33. The blocking plate 12 divides the inner cavity of the fryer main body 1 into a cold air channel 13 between the motor bracket 11 and the blocking plate 12 and a hot air channel 14 between the blocking plate 12 and the fryer main body 1. Among them, the first fan 32 is arranged in the cold air channel 13, and the second fan 33 is arranged in the hot air channel 14. The second fan 33 is a centrifugal fan, the blocking plate 12 is provided with a guide plate 121 for guiding the hot air output by the second fan 33 into the fryer basket 2, and the guide plate 121 is fixed to the blocking plate 12 by screws and is arranged obliquely at the top of the second fan 33.
[0043] Referring to Figure 1 and Figure 4 , the fryer main body 1 includes a main housing 15 and a fryer back plate 16 for covering the opening on the rear side of the main housing 15. The fryer back plate 16 is provided with an air inlet 161, and the fryer back plate 16 is provided with a guide groove 162 recessed towards the hot air circulation assembly 3 at the opening of the air inlet 161. The air inlet 161 is arranged on the top surface of the guide groove 162, so as to help guide the cold air in the outer cavity of the fryer main body 1 into the inner cavity of the fryer main body 1, and to help reduce the entry of dust, impurities and the like into the inner cavity of the fryer main body 1. The fryer main body 1 has a placement cavity 17 for arranging the fryer basket 2. In order to improve the flexibility of the air fryer, the inner cavity of the fryer main body 1 has two placement cavities 17 for arranging the fryer basket 2, and the two placement cavities 17 are independent of each other. In order to guarantee the cooking effect of the food in the fryer basket 2, one placement cavity 17 corresponds to a set of hot air circulation assemblies 3 and one blocking plate 12.
[0044] Referring to Figure 1 , the inner cavity of the fryer main body 1 has a cooling gap 18 between the bottom surface of the placement cavity 17, and the cooling gap 18 communicates with the cold air channel 13. The bottom surface of the fryer main body 1 is provided with an air outlet 151, and the outer side wall of the fryer main body 1 is further provided with a mounting leg 19, which can effectively reduce the influence of the heat generated during cooking on the bottom of the fryer, and help the smooth flow of air.
[0045] Referring to Figure 5 and Figure 6The frying basket 2 comprises an outer shell 21 and an inner shell 22 arranged in the outer shell 21, and a ventilation gap 23 is formed between the outer shell 21 and the inner shell 22. The inner cavity of the outer shell 21 is provided with a mounting seat 211, the bottom of the inner shell 22 is provided with a mounting groove 221 matched with the mounting seat 211, and the outer shell 21 and the inner shell 22 are fixedly connected through screws. In order to improve the circulation efficiency of hot air in the frying basket 2, a ventilation opening 212 is formed on one side of the outer shell 21 facing the hot air circulation assembly 3, a first circulation hole 222 is formed on the bottom of the inner shell 22, and a second circulation hole 223 is formed on the side of the inner shell 22 away from the ventilation opening 212. When the hot air is output to the frying basket 2 through the second fan 33, part of the hot air enters the ventilation gap 23 between the outer shell 21 and the inner shell 22 through the ventilation opening 212, and then continuously circulates in the frying basket 2 through the first circulation hole 222 and the second circulation hole 223 formed on the inner shell 22, thereby improving the cooking effect of the air fryer on food. In order to reduce the probability of food residues entering the ventilation gap 23 during cooking, the top surface of the inner shell 22 extends towards the outer shell 21 and abuts against the inner wall of the outer shell 21.
[0046] Referring to Figure 1 and Figure 3 , in order to make the food in the frying basket 2 be heated uniformly, the blocking plate 12 is further provided with a wind guide assembly 4 for guiding hot air into the inner cavity of the frying basket 2. The blocking plate 12 comprises an upper blocking portion 122 arranged on the top surface of the frying basket 2, and the wind guide assembly 4 is arranged on the bottom surface of the upper blocking portion 122.
[0047] Referring to Figure 3 and Figure 7 , the wind guide assembly 4 comprises a first wind guide plate 41 obliquely mounted on the upper blocking portion 122, a second wind guide plate 42 obliquely mounted on the upper blocking portion 122 and inclined away from the first wind guide plate 41, and a third wind guide plate 43 mounted on the first wind guide plate 41 and arranged in parallel with the motor bracket 11. The first wind guide plate 41 and the second wind guide plate 42 have a guide gap 44 for guiding hot air flowing from the top of the guide plate 121 of the second fan 33, and the third wind guide plate 43 helps to block part of the hot air in the guide gap 44 and drive the hot air to diffuse downward, thereby improving the heating efficiency of the food. The first wind guide plate 41 has a mounting portion 411 for mounting the third wind guide plate 43, the third wind guide plate 43 is fixed on the first wind guide plate 41 through screws, and the first wind guide plate 41 and the second wind guide plate 42 are fixed on the upper blocking portion 122 of the blocking plate 12 through screws.
[0048] Referring to Figure 4 and Figure 8, in order to further improve the smooth flow of air and reduce the probability of air burns of the user, the air fryer back plate 16 is provided with a mounting hole 163 on one side of the air inlet 161, and the air fryer back plate 16 is provided with an exhaust fan 164 at the mounting hole 163, and the exhaust fan 164 has a exhaust passage 1641 connected with the cold air channel 13, the hot air channel 14 and the outer cavity of the air fryer main body 1, so that the hot air in the hot air channel 14 can be cooled by the cold air channel 13 and then discharged to the outer cavity of the air fryer main body 1.
[0049] The implementation principle of the air fryer according to an embodiment of the present application is as follows: during the operation of the air fryer, cold air is input into the inner cavity of the air fryer main body 1 through the cooperation between the driving motor 31 and the first fan 32, and then the cold air is heated by the heating element 34 and the rotation of the second fan 33 driven by the driving motor 31 is promoted, so that the hot air flows in the inner cavity of the air fryer main body 1, when the hot air flows to the guide plate 121 on the top surface of the second fan 33, the guide plate 121 guides the hot air to the air guide assembly 4, so that the hot air is input into the inner cavity of the air basket 2 to heat the food, at the same time, the outer shell 21 of the air basket 2 is provided with the air vent 212, so that part of the hot air can also enter the ventilation gap 23 through the air vent 212, and the first circulation hole 222 and the second circulation hole 223 are provided on the inner shell 22, so that the hot air can flow continuously in the air basket 2, thereby reducing the phenomenon of local overheating in the air basket 2 and ensuring the cooking effect of the food.
[0050] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.
Claims
1. An air fryer characterized in that, The utility model provides a hot air frying pot, including frying pot main part (1), the frying basket (2) of arrangement in frying pot main part (1) and the hot air circulation subassembly (3) of installation in the inner chamber of frying pot main part (1), frying pot main part (1) is set up with the air inlet (161) and the air outlet (151) on and frying pot main part (1) is at hot air circulation subassembly (3) place is provided with the baffle (12), frying pot main part (1) still have the arrangement chamber (17) for the arrangement of frying basket (2), frying basket (2) includes the outer casing (21) and inner casing (22), and the inner casing (22) with the outer casing (21) between have ventilation gap (23), the outer casing (21) is set up with the air vent (212) on the side to hot air circulation subassembly (3), and the bottom of inner casing (22) is set up with the first circulation hole (222) and the side of inner casing (22) away from hot air circulation subassembly (3) is set up with the second circulation hole (223), the baffle (12) still is provided with the air guide subassembly (4) for guiding hot air to frying basket (2).
2. An air fryer according to claim 1, wherein, The inner cavity bottom surface of the outer casing (21) is provided with a mounting seat (211), the inner casing (22) has a mounting groove (221) matched with the mounting seat (211), and the top surface of the inner casing (22) extends towards the outer casing (21) and abuts against a limiting flange (224) of the outer casing (21).
3. The air fryer according to claim 1, wherein, The hot air circulation subassembly (3) includes a drive motor (31), a first fan (32) connected to an output shaft of the drive motor (31), a second fan (33) connected to the output shaft of the drive motor (31) and located on the side of the first fan (32) facing the frying basket (2), and a heating element (34) located between the second fan (33) and the frying basket (2). The frying pot main body (1) is provided with a motor rack (11) for arranging the drive motor (31), and the baffle (12) is arranged between the first fan (32) and the second fan (33).
4. An air fryer according to claim 3, wherein, The second fan (33) is a centrifugal fan, the baffle (12) is provided with a guide plate (121) for guiding the hot air output from the second fan (33) into the frying basket (2), and the guide plate (121) is inclinedly arranged on the top of the second fan (33).
5. An air fryer according to claim 4, wherein, The barrier plate (12) comprises an upper barrier portion (122) arranged on the top surface of the frying basket (2), and the air guide assembly (4) is arranged on the bottom surface of the upper barrier portion (122); the air guide assembly (4) comprises a first air guide plate (41) obliquely arranged on the upper barrier portion (122), a second air guide plate (42) obliquely arranged on the upper barrier portion (122) and inclined away from the first air guide plate (41), and a third air guide plate (43) arranged on the first air guide plate (41) and parallel to the motor frame (11); the first air guide plate (41) and the second air guide plate (42) are arranged opposite to the air guide plate (121), and the first air guide plate (41) has a mounting portion (411) for mounting the third air guide plate (43).
6. An air fryer according to claim 3, wherein, The frying pot body (1) comprises a frying pot back plate (16), and the frying pot back plate (16) is provided with a flow guide groove (162) recessed towards the hot air circulation assembly (3) at the opening of the air inlet (161), and the air inlet (161) is arranged on the top surface of the flow guide groove (162).
7. An air fryer according to claim 6, wherein, The barrier plate (12) divides the inner cavity of the frying pot body (1) into a cold air channel (13) and a hot air channel (14), the first fan (32) is arranged in the cold air channel (13), and the second fan (33) is arranged in the hot air channel (14).
8. An air fryer according to claim 7, wherein, The frying pot back plate (16) is provided with a mounting hole (163) on one side of the air inlet (161), and the frying pot back plate (16) is provided with an air exhaust member (164) at the mounting hole (163), and the air exhaust member (164) has an exhaust passage (1641) communicating with the cold air channel (13), the hot air channel (14) and the outer cavity of the frying pot body (1).
9. An air fryer according to claim 8, wherein, The arrangement chamber (17) and the bottom surface of the inner cavity of the frying pot body (1) have a cooling gap (18) communicating with the cold air channel (13), and the air outlet (151) is arranged on the bottom surface of the frying pot body (1), and the outer side wall of the frying pot body (1) is further provided with a mounting leg (19).
10. The air fryer according to claim 1, wherein, The inner cavity of the frying pot body (1) has two arrangement chambers (17) for arranging the frying basket (2), and the two arrangement chambers (17) are independent of each other, and one arrangement chamber (17) corresponds to a group of hot air circulation assemblies (3) and one barrier plate (12).