A high-temperature calcination furnace for light soda ash

Abstract

The present invention discloses a high-temperature calcination furnace for light soda ash, which relates to the technical field of calcination furnaces. At present, in the long-term high-temperature calcination process of the high-temperature calcination furnace for light soda ash, some impurities or unreacted substances in the soda ash raw materials are likely to condense and accumulate on the furnace wall, forming scale. This phenomenon not only seriously affects the heat transfer efficiency of the furnace body, resulting in a significant increase in energy consumption, but also as the scale layer thickens continuously, the effective space inside the furnace gradually decreases, and the production capacity also decreases accordingly. The present invention can flexibly adjust the internal space size of the oxygen inlet chamber through the oxygen pushing component, thereby changing the air flow rate, ensuring that air is quickly and fully blown into the calcination chamber and achieving complete penetration. This not only speeds up the combustion reaction rate, improves the calcination efficiency, shortens the production cycle, but also enables the impurities in the soda ash raw materials to react more fully with oxygen, reduces impurity residues, and improves the product purity.

Description

Technical Field

[0001] The present invention relates to the technical field of calcining furnaces, and particularly to a high-temperature calcining furnace for light soda ash. Background Art

[0002] In the chemical industry, soda ash manufacturing is an important field. As the core equipment in the production process of light soda ash, the performance of the high-temperature calcining furnace for light soda ash plays a decisive role in the entire production process. The working principle of the high-temperature calcining furnace for light soda ash is to transport the pretreated soda ash raw materials into the furnace, create a high-temperature environment through the combustion system, and promote the raw materials to undergo chemical reactions under specific temperature and time conditions, thereby removing impurities such as moisture and carbon dioxide, and producing light soda ash products that meet the quality standards.

[0003] In this regard, the patent document with the publication number CN222279307U discloses a high-temperature calcining furnace, which obtains heat through an electric heating method, can effectively avoid the common problems of unevenness, overheating, or incomplete calcination in traditional calcination, thereby ensuring and improving the quality of calcined products; it also reduces the loss of medicinal materials and improves the finished product rate; its closed furnace body and stable temperature control simplify the operation process and reduce environmental pollution.

[0004] However, in the long-term high-temperature calcination process of the current high-temperature calcining furnace for light soda ash, some impurities or unreacted substances in the soda ash raw materials are likely to condense and accumulate on the furnace wall, forming scale. This phenomenon not only seriously affects the heat transfer efficiency of the furnace body, resulting in a significant increase in energy consumption, but also as the scale layer thickens continuously, the effective space inside the furnace gradually decreases, and the production capacity also decreases accordingly.

[0005] In view of the above problems, a high-temperature calcining furnace for light soda ash is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a high-temperature calcining furnace for light soda ash, which solves the problem that the impurities in the soda ash raw materials in the background art cannot react fully.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A high-temperature calcining furnace for light soda ash, including an oxygen inlet chamber, characterized in that: the top of the oxygen inlet chamber is connected to a calcining chamber, the top of the calcining chamber is provided with a smoke exhaust chamber, an oxygen inlet is opened on one side surface of the oxygen inlet chamber, and the oxygen inlet is used for transporting air into the interior of the oxygen inlet chamber;

[0008] A calcining component is embedded in the interior of the calcining chamber, the calcining component includes an integration plate, the integration plate is embedded in the interior of the calcining chamber, the bottom end of the integration plate is connected to a calcining tubular bin, and a scraper is wrapped on the outer surface of the bottom end of the calcining tubular bin, and the scraper is attached to the inner wall of the calcining chamber;

[0009] A lifting screw rod penetrates through the interior of the integration plate, and the lifting screw rod is movably connected to the integration plate. A calcination chamber is provided inside the calcination tubular bin. A top filter screen is embedded at the top end of the calcination chamber, and a bottom filter screen is embedded at the bottom end of the calcination chamber. The interior of the calcination chamber is used to store the light soda ash to be processed. Swing plates are inclinedly arranged on the left and right inner walls of the calcination tubular bin, and the swing plates are movably connected to the calcination chamber. When air enters the calcination chamber, it pushes the swing plates to swing.

[0010] Preferably, the propulsion chamber plate is pushed by a hydraulic cylinder to slide inside the oxygen inlet chamber. A driving motor is fixedly connected to the outer wall of the smoke exhaust chamber. The output end of the driving motor is fixedly connected to a lifting screw rod. The driving motor drives the rotation of the lifting screw rod to make the integration plate longitudinally slide on the lifting screw rod.

[0011] Preferably, the air enters from the bottom filter screen and is discharged from the top filter screen, and the swing plate deflects upward.

[0012] Preferably, the swing plate is only connected to one inner wall of the calcination chamber. On the side of the swing plate that is not connected to the inner wall of the calcination chamber, there is a channel for air circulation.

[0013] Preferably, the scraper is wrapped around each calcination tubular bin. There are multiple groups of scrapers wrapped around the calcination tubular bin, and each group of scrapers is arranged at equal intervals.

[0014] Preferably, the calcination tubular bins are evenly distributed at the bottom end of the integration plate in a 4×4 arrangement, and each group of calcination tubular bins is made of cast iron.

[0015] Preferably, a oxygen pushing component is embedded inside the oxygen inlet chamber. The oxygen pushing component includes a propulsion chamber plate. The propulsion chamber plate is slidably connected to the oxygen inlet chamber. An air inlet is also provided on the oxygen inlet chamber, and the air inlet is connected to the interior of the oxygen inlet chamber.

[0016] Preferably, an air duct is also embedded inside the oxygen inlet chamber. The air duct is arranged in a U shape. A separation plate is arranged inside the oxygen inlet chamber. One end of the air duct is arranged directly above the separation plate, and the other end is embedded between the propulsion chamber plate and the oxygen inlet chamber. The separation plate is provided with a filter slot for filtering impurities. The opening size of the filter slot in the area where the separation plate is in contact with the air duct is larger than the opening size of the filter slot in the middle position of the separation plate.

[0017] Preferably, the air duct is a tubular structure made of flexible material. A guiding plate is fixedly connected to the bottommost end of the inner wall of the oxygen inlet chamber. The upper surface of the guiding plate is an arc surface, and the arc surface corresponds to the air inlet.

[0018] Preferably, the propulsion chamber plate is pushed by a hydraulic cylinder to slide inside the oxygen inlet chamber. There are two groups of the propulsion chamber plates. One end of the air duct is embedded between the propulsion chamber plate and the oxygen inlet chamber. The air filling port is in communication with the inside of the air duct. External air flows into the inside of the air duct through the air filling port and finally enters the inside of the oxygen inlet chamber.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] A light soda ash high-temperature calcination furnace provided by the present invention can flexibly adjust the internal space size of the oxygen inlet chamber through the oxygen pushing assembly, thereby changing the air flow rate, ensuring that air is quickly and fully blown into the calcination chamber and achieving complete penetration. This not only speeds up the combustion reaction rate, improves the calcination efficiency, shortens the production cycle, but also enables impurities in the soda ash raw material to react more fully with oxygen, reduces impurity residues, and improves the product purity.

[0021] A light soda ash high-temperature calcination furnace provided by the present invention wraps the soda ash in groups through multiple calcination tubular bins, making it heated more evenly and efficiently. Driven by a driving motor, it moves up and down, enabling the soda ash to be fully mixed inside under the agitation of air, promoting the full contact and reaction of the soda ash with oxygen. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is a schematic diagram of the structure of the propulsion chamber plate and the air filling port of the present invention;

[0024] Figure 3 is a schematic sectional view of the calcination chamber of the present invention;

[0025] Figure 4 is a schematic diagram of the structure of the calcination tubular bin and the scraper of the present invention;

[0026] Figure 5 is a schematic diagram of the structure of the driving motor and the calcination tubular bin of the present invention;

[0027] Figure 6 is a schematic sectional view of the calcination tubular bin of the present invention;

[0028] Figure 7 is a schematic diagram of the structure of the separation plate and the air duct of the present invention;

[0029] Figure 8 is a schematic sectional view of the oxygen inlet chamber of the present invention;

[0030] Figure 9 is a schematic diagram of the structure of the air duct and the guiding plate of the present invention;

[0031] Figure 10 This is a schematic diagram of the distribution position where the swing plate of the present invention is installed in the calcination chamber.

[0032] In the figure: 11, oxygen inlet chamber; 12, calcination chamber; 13, smoke exhaust chamber; 14, oxygen inlet; 2, oxygen pushing assembly; 21, propulsion chamber plate; 22, air injection port; 23, separation plate; 24, air duct; 25, guiding plate; 3, calcination assembly; 31, driving motor; 32, lifting screw; 33, calcination tubular bin; 34, scraper; 35, integration plate; 36, calcination bin; 37, top filter screen; 38, swing plate; 39, bottom filter screen. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] To further understand the content of the present invention, the present invention will be described in detail in conjunction with the accompanying drawings.

[0035] Combined with Figures 1 - 10 , a high-temperature calcination furnace for light soda ash of the present invention includes an oxygen inlet chamber 11. The top of the oxygen inlet chamber 11 is connected to a calcination chamber 12. A smoke exhaust chamber 13 is installed at the top of the calcination chamber 12. An oxygen inlet 14 is opened on one side surface of the oxygen inlet chamber 11. The oxygen inlet 14 is used to convey air into the interior of the oxygen inlet chamber 11;

[0036] In the high-temperature calcination of light soda ash, the calcination reaction needs to be carried out in a suitable oxidation environment with the participation of oxygen. When the air delivery volume is insufficient and the oxygen concentration is low, some impurities in the soda ash raw materials cannot be fully oxidized and removed. For example, the low-valent metal sulfide impurities that may be contained in the raw materials cannot be completely oxidized into high-valent metal oxides and sulfur dioxide gas and escape when the oxygen is insufficient, resulting in an increase in the content of sulfur and other impurities in the final product. To avoid such problems, through the setting of the oxygen pushing assembly 2, the introduction amount of air is adjusted during calcination, which can also reduce the generation of side reactions. The specific operation is as follows:

[0037] Inside the oxygen inlet chamber 11, an oxygen pushing component 2 is embedded. The oxygen pushing component 2 includes a propulsion chamber plate 21. The propulsion chamber plate 21 is slidably connected to the oxygen inlet chamber 11. An air injection port 22 is also provided on the oxygen inlet chamber 11. The air injection port 22 communicates with the inside of the oxygen inlet chamber 11. A duct 24 is also embedded inside the oxygen inlet chamber 11. The duct 24 is arranged in a U shape. A separation plate 23 is provided inside the oxygen inlet chamber 11. One end of the duct 24 is arranged directly above the separation plate 23, and the other end is embedded between the propulsion chamber plate 21 and the oxygen inlet chamber 11. The duct 24 is a tubular structure made of a flexible material. At the bottommost end of the inner wall of the oxygen inlet chamber 11, a guiding plate 25 is fixedly connected. The upper surface of the guiding plate 25 is an arc surface, and the arc surface corresponds to the oxygen inlet 14. The propulsion chamber plate 21 is pushed by a hydraulic cylinder to slide inside the oxygen inlet chamber 11. There are two groups of propulsion chamber plates 21. One end of the duct 24 is embedded between the propulsion chamber plate 21 and the oxygen inlet chamber 11. The air injection port 22 communicates with the inside of the duct 24. External air flows into the inside of the duct 24 through the air injection port 22 and finally enters the inside of the oxygen inlet chamber 11. The other end of the duct 24 is placed on the left and right sides of the separation plate 23. The separation plate 23 is provided with filter grooves for filtering impurities. The opening size of the filter grooves provided in the area where the separation plate (23) is in contact with the duct (24) is larger than the opening size of the filter grooves in the middle position of the separation plate.

[0038] When calcining light soda ash at high temperature, air is conveyed into the inside of the oxygen inlet chamber 11 through the oxygen inlet 14. After the conveyed air enters the inside of the oxygen inlet chamber 11 through the oxygen inlet chamber 11, the flow direction of the air is changed by the guiding plate 25. By means of the guiding plate 25, the air conveyed from the oxygen inlet 14 into the inside of the oxygen inlet chamber 11 can flow upward.

[0039] When calcining soda ash, the air flow rate is adjusted by changing the internal space size of the oxygen inlet chamber 11, so that the air can be blown into the calcining chamber more quickly and penetrate more completely. Such a setting can bring benefits in many aspects such as reaction efficiency, product quality, energy utilization, and equipment maintenance, as follows:

[0040] When the propulsion chamber plate 21 is pushed by hydraulic pressure into the interior of the oxygen inlet chamber 11, the internal space of the oxygen inlet chamber 11 is reduced after the propulsion. At this time, based on the same air delivery volume, the air flow rate inside the oxygen inlet chamber 11 is faster. The faster flow rate enables the fuel and oxygen to contact more fully and quickly, thereby accelerating the combustion reaction rate, releasing a large amount of heat in a shorter time, providing a sufficient high-temperature environment for soda ash calcination, helping to improve the calcination efficiency and shorten the production cycle. The acceleration of the air flow rate can enhance the gas flow in the calcination chamber and promote the heat and mass transfer process. In addition, when the air flow rate increases, the air penetration is more complete, enabling the impurities in the soda ash raw material to react more fully with oxygen and be oxidized into substances that are easy to remove, thereby reducing the residue of impurities in the product and improving the purity of soda ash.

[0041] In the initial state, the propulsion chamber plate 21 is in close contact with the inner wall of the oxygen inlet chamber 11. Since the air duct 24 is located between the propulsion chamber plate 21 and the oxygen inlet chamber 11, the air duct 24 is flattened under the extrusion of the force. When the propulsion chamber plate 21 starts to move into the interior of the oxygen inlet chamber 11, the internal space of the oxygen inlet chamber 11 is continuously reduced under the propulsion of the propulsion chamber plate 21. At this time, the propulsion chamber plate 21 and the oxygen inlet chamber 11 are separated. After separation, the air duct 24 begins to recover. During the recovery, the originally flattened state of the air duct 24 gradually unfolds. At this time, the channel for air to flow inside the air duct 24 is also unfolded. At this time, air can flow into the interior of the air duct 24 through the air inlet 22, and then be transported to the interior of the oxygen inlet chamber 11 through the air duct 24. When the air introduced into the interior of the oxygen inlet chamber 11 from the oxygen inlet 14 moves upward, the air flowing at a high speed inside the oxygen inlet chamber 11 can attract the air inside the air duct 24. Based on the connection between the air inlet 22 and the air duct 24, the air supply inside the oxygen inlet chamber 11 can also be supplied through the air inlet 22 and the air duct 24.

[0042] When a large amount of air supply is not required, the propulsion chamber plate 21 and the inner wall of the oxygen inlet chamber 11 approach each other. During the approach, the air duct 24 is squeezed, and at this time, the channel for air to flow inside the air duct 24 is compacted, so that air cannot flow into the interior of the air duct 24 through the air inlet 22.

[0043] On the basis of solving the problem of insufficient air delivery, the quality of high-temperature calcination of soda ash is further improved by the calcination assembly 3, and the generation of side reactions is reduced. The specific operation is as follows:

[0044] The inside of the calcination chamber 12 is embedded with a calcination component 3. The calcination component 3 includes an integration plate 35. The integration plate 35 is embedded in the inside of the calcination chamber 12. The bottom end of the integration plate 35 is connected with a calcination tubular bin 33. The calcination tubular bins 33 are evenly distributed at the bottom end of the integration plate 35 in a 4×4 arrangement. And each group of calcination tubular bins 33 is made of cast iron. The outer surface of the bottom end of the calcination tubular bin 33 is wrapped with a scraper 34. The scraper 34 is wrapped on each group of calcination tubular bins 33. There are multiple groups of scrapers 34 wrapped on the calcination tubular bin 33. And the distance between each group of scrapers 34 is set at equal intervals. The scraper 34 is attached to the inner wall of the calcination chamber 12. A lifting screw 32 penetrates through the inside of the integration plate 35. The lifting screw 32 is movably connected with the integration plate 35. A driving motor 31 is fixedly connected to the outer wall of the smoke exhaust chamber 13. The output end of the driving motor 31 is fixedly connected with the lifting screw 32. The driving of the lifting screw 32 by the driving motor 31 makes the integration plate 35 slide longitudinally on the lifting screw 32;

[0045] A calcination bin 36 is provided inside the calcination tubular bin 33. A top filter screen 37 is embedded at the top end of the calcination bin 36. A bottom filter screen 39 is embedded at the bottom end of the calcination bin 36. The inside of the calcination bin 36 is used to store the light soda ash to be processed. A swing plate 38 is inclined inside the calcination tubular bin 33. The swing plates 38 are evenly distributed on the left and right sides of the inner wall of the calcination bin 36. The swing plate 38 is only connected to one side inner wall of the calcination bin 36. On the side where the swing plate 38 is not connected to the inner wall of the calcination bin 36, there is a channel for air circulation. The swing plate 38 is movably connected with the calcination bin 36. In the initial state, the swing plate 38 is inclined downward and connected to the inner wall of the calcination bin 36. Air enters the inside of the calcination bin 36 through the bottom filter screen 39. When the air flows towards the side of the top filter screen 37, the swing plate 38 deflects upward.

[0046] In order to improve the quality of calcination, during the calcination of soda ash, the driving motor 31 drives the lifting screw 32 to rotate. When the lifting screw 32 rotates, it drives the integration plate 35 to rise and fall. In this way, the integration plate 35, the calcination tubular bin 33 and the scraper 34 move up and down inside the calcination chamber 12;

[0047] First, place the soda ash raw material to be processed into the calcination chamber 36 opened inside the calcination tubular bin 33. The soda ash to be processed is distributed by multiple groups of calcination tubular bins 33. After the soda ash is placed inside the calcination tubular bin 33, the calcination tubular bin 33 moves up and down. During this process, air will be squeezed into the calcination tubular bin 33. When the calcination tubular bin 33 moves downward, the air transported into the oxygen inlet chamber 11 will be transported into the calcination chamber 36 through the bottom filter screen 39. At this time, it will blow the soda ash raw material stored inside the calcination chamber 36. After the air enters the calcination chamber 36 from the bottom filter screen 39, the flowing air blows the swing plate 38 upward, driving the soda ash to float upward. When the calcination tubular bin 33 moves upward, part of the air will be blown into the calcination chamber 36 through the top filter screen 37. At this time, the soda ash will float inside the calcination chamber 36 under the agitation of the air, thus achieving the mixing effect. In the mixing process, the soda ash and the oxygen in the air are more likely to come into contact, so the reaction will be more complete. Through the setting of the swing plate 38, the resistance to the soda ash is increased, enabling the soda ash to be better dispersed during its movement inside.

[0048] To improve the effect of high-temperature calcination of soda ash, the soda ash to be processed can be wrapped by the calcination tubular bin 33 and divided into multiple groups, making it easier to be heated. Due to the small volume, the heating efficiency is improved. At the same time, by the contact between the scraper 34 and the inner wall of the calcination chamber 12, the impurities on the inner wall of the calcination chamber 12 are removed during the up-and-down sliding, so that the occurrence of side reactions can be reduced during the reaction.

[0049] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0050] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature calcining furnace for light soda ash, comprising an oxygen inlet chamber (11), characterized in that: The top of the oxygen inlet chamber (11) is connected to the calcining chamber (12), the top of the calcining chamber (12) is provided with a smoke exhaust chamber (13), and an oxygen inlet (14) is provided on one side surface of the oxygen inlet chamber (11), and the oxygen inlet (14) is used to transport air into the interior of the oxygen inlet chamber (11); A calcining assembly (3) is embedded in the calcining chamber (12), and the calcining assembly (3) comprises an integration plate (35). The integration plate (35) is embedded in the calcining chamber (12), and the bottom end of the integration plate (35) is connected to a calcining tubular bin (33). The outer surface of the bottom end of the calcining tubular bin (33) is wrapped with a scraper (34), and the scraper (34) is attached to the inner wall of the calcining chamber (12); A lifting screw (32) penetrates the interior of the integration plate (35), and the lifting screw (32) and the integration plate (35) are movably connected. A calcining bin (36) is provided inside the calcining tubular bin (33), and a top filter (37) is embedded in the top of the calcining bin (36), and a bottom filter (39) is embedded in the bottom of the calcining bin (36). The interior of the calcining bin (36) is used to store light soda ash to be processed. Swinging plates (38) are obliquely arranged on the left and right inner walls of the calcining tubular bin (33), and the swinging plates (38) and the calcining bin (36) are movably connected. Air enters the calcining bin (36) to push the swinging plates (38) to swing.

2. A light soda ash high temperature calcining furnace according to claim 1, characterized in that: A driving motor (31) is fixedly connected to the outer wall of the smoke exhaust chamber (13), and a lifting screw (32) is fixedly connected to the output end of the driving motor (31). The driving motor (31) drives the lifting screw (32) to rotate so that the integration plate (35) slides longitudinally on the lifting screw (32).

3. A light soda ash high temperature calcining furnace according to claim 1, characterized in that: The air enters the top filter (37) through the bottom filter (39) and is discharged, and the swing plate (38) is deflected upward.

4. A high-temperature calcining furnace for light soda ash according to claim 3, characterized in that: The swing plate (38) is connected to the inner wall of only one side of the calcining bin (36), and a channel for air circulation is provided on the side of the swing plate (38) that is not connected to the inner wall of the calcining bin (36).

5. The high-temperature calcining furnace for light soda ash according to claim 1, characterized in that: The scraper (34) is wrapped around each group of calcining tubular bins (33), and the calcining tubular bins (33) are wrapped with multiple groups of scrapers (34), and the scrapers (34) in each group are arranged at equal intervals.

6. A high-temperature calcining furnace for light soda ash according to claim 5, characterized in that: The calcining tubular bins (33) are evenly distributed at the bottom end of the integration plate (35) in a 4×4 arrangement, and each group of the calcining tubular bins (33) is made of cast iron.

7. The high-temperature calcining furnace for light soda ash according to claim 1, characterized in that: An oxygen pushing assembly (2) is embedded in the interior of the oxygen inlet chamber (11), and the oxygen pushing assembly (2) includes a pushing cabin (21). The pushing cabin (21) and the oxygen inlet chamber (11) are slidably connected. The oxygen inlet chamber (11) is also provided with an air filling port (22), and the air filling port (22) is connected to the interior of the oxygen inlet chamber (11).

8. A high-temperature calcining furnace for light soda ash according to claim 7, characterized in that: An air duct (24) is also embedded in the oxygen inlet chamber (11), and the air duct (24) is arranged in a U shape. A separation plate (23) is arranged in the oxygen inlet chamber (11), one end of the air duct (24) is arranged directly above the separation plate (23), and the other end is embedded between the propulsion cabin plate (21) and the oxygen inlet chamber (11). A filter groove for filtering impurities is provided on the separation plate (23), and the opening size of the filter groove provided in the area where the separation plate (23) and the air duct (24) are attached is larger than the opening size of the filter groove at the middle position of the separation plate.

9. A high-temperature calcining furnace for light soda ash according to claim 8, characterized in that: The air guide pipe (24) is a tubular structure made of a flexible material. A guide plate (25) is fixedly connected to the bottom end of the inner wall of the oxygen inlet chamber (11). The upper surface of the guide plate (25) is an arc surface, and the arc surface corresponds to the oxygen inlet port (14).

10. A high-temperature calcining furnace for light soda ash according to claim 9, characterized in that: The propulsion cabin (21) is pushed by a hydraulic cylinder to slide inside the oxygen inlet chamber (11). Two groups of the propulsion cabin (21) are provided. One end of the air guide pipe (24) is embedded between the propulsion cabin (21) and the oxygen inlet chamber (11). The air filling port (22) is connected to the inside of the air guide pipe (24). External air flows from the air filling port (22) to the inside of the air guide pipe (24) and finally enters the inside of the oxygen inlet chamber (11).

Images