A protective gas injection device for grain storage tanks

Abstract

This invention relates to the field of grain storage equipment technology and discloses a protective gas injection device for grain storage tanks, including a gas guiding mechanism, a gas compression mechanism, and a gas mixing mechanism. Internally, it features a spiral impeller structure capable of turbulently mixing compressed nitrogen and oxygen. This protective gas injection device for grain storage tanks can inject nitrogen and oxygen into the grain storage equipment at a ratio of 90% and 10%, respectively. This mixed gas effectively delays the decline in the physiological activity and quality deterioration of rice, slowing down the aging process. Furthermore, during gas injection, the device features high precision in individual gas control. Additionally, when injecting the mixed gas into the grain storage tank, it enables effective mixing of nitrogen and oxygen, thereby reducing the negative impacts caused by inconsistent gas ratios within a unit space.

Description

Technical Field

[0001] This invention relates to the field of grain storage equipment technology, specifically to a protective gas injection device for grain storage tanks. Background Technology

[0002] When storing grains, they are generally stored inside equipment. To investigate the optimal storage method for grains, the following experiment was conducted: Six representative rice varieties from four major rice-producing areas in my country were selected and stored for a short period under simulated everyday home rice storage conditions. Then, 17 indicators in four aspects—physicochemical composition, cooking characteristics, rice texture, and gelatinization characteristics—as well as sensory quality were measured. Correlation analysis and predictive modeling were then performed on the 17 indicators and the sensory taste quality of the rice.

[0003] By measuring rice color, microorganisms, fatty acid value, malondialdehyde content, debranching enzymes, α-amylase, polyphenol oxidase, peroxidase, volatile substances, amylose, reducing sugar, starch granule structure, cooked rice hardness, stickiness, and resilience, it was found that rice aged at 37℃ for 6 months exhibited decreased physiological activity and significant quality deterioration. Modified atmosphere packaging with 90% N2 + 10% O2 can effectively delay the decline in rice physiological activity and quality deterioration, slowing down the aging process.

[0004] In order to inject a 90% N2 + 10% O2 mixed gas into a grain storage tank in the above proportion, a protective gas injection device for grain storage tanks needs to be designed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a protective gas injection device for grain storage tanks. This device injects nitrogen and oxygen into the grain storage tank at a ratio of 90% and 10%, respectively. This mixed gas effectively slows down the decline in the physiological activity and quality deterioration of rice, reducing the aging process. Furthermore, the device features high precision in individual gas control during the gas injection process. Additionally, the injection of the mixed gas into the grain storage tank ensures effective mixing of nitrogen and oxygen, thereby reducing the negative impacts caused by inconsistent gas ratios within a unit space. This solves the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a protective gas injection device for grain storage tanks, comprising a drive motor installed in a motor fixed bushing, a rotating disk fixedly installed at the rotor end of the drive motor, a rotating rod fixedly installed on one end face of the rotating disk, a bushing mounted on the circumferential surface of the rotating rod body via bearings, and a movable rod fixedly installed on the bottom circumferential surface of the bushing; a gas guiding mechanism, which internally comprises a nitrogen compression chamber for drawing nitrogen from the outside and compressing and discharging it to one side, and an oxygen compression chamber for drawing oxygen from the outside and compressing and discharging it to one side; a gas compression mechanism, which internally comprises an upper piston body capable of longitudinal piston movement with the movable rod and capable of gas intake and compression discharge within the nitrogen compression chamber, and a lower piston body capable of longitudinal piston movement with the movable rod and capable of gas intake and compression discharge within the oxygen compression chamber; and a gas mixing mechanism, which internally comprises a spiral impeller structure capable of turbulent mixing of compressed and discharged nitrogen and oxygen.

[0007] Preferably, the rotating rod is fixedly positioned on the side offset from the axis of the rotating disk.

[0008] Preferably, the gas guiding mechanism includes a vertical hollow cylinder. The bottom end of the vertical hollow cylinder is provided with a bottom support base plate integrally formed therewith. The upper end face of the vertical hollow cylinder is provided with a nitrogen compression chamber with a downwardly concave structure and an open top. The bottom end of the nitrogen compression chamber is provided with a nitrogen limiting flow chamber. The bottom end of the nitrogen limiting flow chamber is provided with a longitudinal rod perforation. The bottom end of the longitudinal rod perforation is provided with an oxygen compression chamber. The bottom end of the oxygen compression chamber is provided with an oxygen limiting flow chamber. The circumferential surface of the vertical hollow cylinder is provided with a nitrogen discharge channel connecting the external space and one side of the nitrogen limiting flow chamber. The circumferential surface of the vertical hollow cylinder is provided with a channel connecting the external space... The vertical hollow cylinder has a nitrogen intake channel on the other side of the nitrogen limiting flow chamber, an oxygen discharge channel connecting the external space and one side of the oxygen limiting flow chamber on its circumferential surface, an oxygen intake channel connecting the external space and the other side of the oxygen limiting flow chamber on its circumferential surface, a first gas check valve installed inside the nitrogen discharge channel, a second gas check valve installed inside the oxygen discharge channel, a third gas check valve installed inside the nitrogen intake channel, and a fourth gas check valve installed inside the oxygen intake channel.

[0009] Preferably, the bottom surface area of ​​the nitrogen compression chamber is in a 9:1 ratio with that of the oxygen compression chamber, and the depth of the nitrogen compression chamber is the same as that of the oxygen compression chamber.

[0010] Preferably, the inlet port of the first gas check valve and the exhaust port of the third gas check valve are both oriented toward the nitrogen limiting flow chamber.

[0011] Preferably, the inlet port of the second gas check valve and the exhaust port of the fourth gas check valve both face the oxygen limiting flow chamber.

[0012] Preferably, the gas compression mechanism includes an upper piston body located inside the nitrogen compression chamber and capable of moving axially along the nitrogen compression chamber, and a lower piston body located inside the oxygen compression chamber and capable of moving axially along the oxygen compression chamber. The lower end face of the upper piston body and the upper end face of the lower piston body are connected by a longitudinal linkage shaft that passes through the nitrogen limiting flow chamber and the longitudinal rod through-hole. A sealing ring to prevent gas leakage along the gap is embedded inside the longitudinal rod through-hole. A spherical fixing shell is fixedly installed at the center of the upper end face of the upper piston body. The upper end face of the spherical fixing shell is provided with a concave hemispherical placement groove. A freely rotatable ball head is placed inside the hemispherical placement groove of the spherical fixing shell. The top of the ball head is provided with a rod fixing groove for fixing and installing the bottom rod of the movable rod.

[0013] Preferably, the ratio of the gas compression caused by the upper piston moving downward to the gas compression caused by the lower piston moving downward is nine to one.

[0014] Preferably, the structural radius of the hemispherical mounting groove matches the structural radius of the spherical head, and the depth of the hemispherical mounting groove is greater than the structural radius of the spherical head.

[0015] Preferably, the gas mixing mechanism includes a transverse hollow structure, the interior of which is provided with a mixed gas flow chamber. One end of the transverse hollow structure is provided with a three-way pipe connecting one end of the mixed gas flow chamber, a nitrogen emission channel, and an oxygen emission channel. The other end of the transverse hollow structure is provided with a mixed gas emission channel connecting the external space and the other end of the mixed gas flow chamber. A central flow divider is provided at the axis of the mixed gas flow chamber in the transverse hollow structure. Both ends of the central flow divider are provided with tip structures for guiding airflow. An integral spiral impeller structure is provided between the rod body of the central flow divider and the circumferential inner wall of the mixed gas flow chamber.

[0016] Compared with the prior art, the present invention provides a protective gas injection device for grain storage tanks, which has the following beneficial effects:

[0017] This grain storage tank uses a protective gas injection device that can inject nitrogen and oxygen into the grain storage equipment at a ratio of 90% and 10%, respectively. This mixed gas at this ratio can effectively delay the decline in the physiological activity and quality deterioration of rice, slow down the aging process, and the device has the characteristics of high precision in individual gas control during the gas injection process. In addition, when injecting the mixed gas into the grain storage tank, nitrogen and oxygen can be effectively mixed, thereby reducing the negative impact caused by inconsistent gas ratios in a unit space. Attached Figure Description

[0018] Figure 1 This is a perspective view of the invention from a first viewpoint;

[0019] Figure 2 This is a perspective view of the invention from a second perspective;

[0020] Figure 3 This is a three-dimensional cross-sectional view of the present invention;

[0021] Figure 4 This is a three-dimensional cross-sectional view of the gas guiding mechanism in this invention;

[0022] Figure 5 This is a perspective view of the gas compression mechanism in this invention;

[0023] Figure 6 This is a three-dimensional cross-sectional view of the gas compression mechanism in this invention;

[0024] Figure 7 This is a three-dimensional cross-sectional view of the gas mixing mechanism in this invention.

[0025] The components include: 1. Motor fixed bushing; 2. Drive motor; 3. Rotor; 4. Rotating disk; 5. Rotating rod; 6. Bushing; 7. Movable rod; 8. Gas guiding mechanism; 81. Vertical hollow cylinder; 82. Bottom support base plate; 83. Nitrogen compression chamber; 84. Nitrogen limiting flow chamber; 85. Longitudinal rod perforation; 86. Oxygen compression chamber; 87. Oxygen limiting flow chamber; 88. Nitrogen discharge channel; 89. Oxygen discharge channel; 810. Nitrogen intake channel; 811. Oxygen intake channel; 812. Gas check valve No. 1; 813. Gas check valve No. 2; 814. Gas check valve No. 4; 815. Gas check valve No. 3; 9. Gas compression mechanism; 91. Upper piston body; 92. Lower piston body; 93. Longitudinal linkage shaft; 94. Spherical fixed shell; 95. Hemispherical mounting slot; 96. Ball head; 97. Rod fixing slot; 10. Gas mixing mechanism; 101. Transverse hollow structure; 102. Mixed gas flow chamber; 103. T-junction pipe; 104. Central diverter rod; 105. Tip structure; 106. Spiral impeller structure; 107. Mixed gas discharge channel. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1 , Figure 2 and Figure 3 A protective gas injection device for grain storage tanks includes a drive motor 2 installed in a motor fixing bushing 1, a rotating disk 4 fixedly installed at the end of the rotor 3 of the drive motor 2, a rotating rod 5 fixedly installed on one end face of the rotating disk 4, a bushing 6 installed on the circumferential surface of the rotating rod 5 via bearings, and a movable rod 7 fixedly installed on the bottom circumferential surface of the bushing 6. In order for the rotating rod 5 to produce a reciprocating driving effect, the rotating rod 5 needs to be fixedly set on one side away from the axis of the rotating disk 4. The bottom support base plate 82 and the motor fixing bushing 1 are fixedly installed on the surface of the corresponding components at a reasonable height. Then, the nitrogen compression chamber 83 and the exhaust port of the storage tank for storing nitrogen are connected through a pipe, the oxygen intake channel 811 and the exhaust port of the storage tank for storing oxygen are connected through a pipe, and finally, the mixed gas discharge channel 107 is connected to the air inlet of the grain storage tank through a pipe. When the drive motor 2 is started, the rotor 3 drives the rotating disk 4 to rotate. According to the piston movement principle, the movable rod 7 can drive the upper piston body 91 and the lower piston body 92 to perform reciprocating push-pull movements.

[0028] To achieve the function of diverting compressed gas, please refer to [link / reference needed]. Figure 1 , Figure 2 , Figure 3 and Figure 4 A gas guiding mechanism 8 needs to be set up, which is equipped with a nitrogen compression chamber 83 for drawing nitrogen from the outside and compressing and discharging it to one side, and an oxygen compression chamber 86 for drawing oxygen from the outside and compressing and discharging it to one side. Nitrogen is drawn into the nitrogen compression chamber 83 through the nitrogen intake channel 810, while oxygen is drawn into the oxygen compression chamber 86 through the oxygen intake channel 811. After being compressed, the nitrogen is discharged into the three-way pipe 103 through the nitrogen discharge channel 88. Similarly, the oxygen is discharged into the three-way pipe 103 through the oxygen discharge channel 89, thereby realizing the function of guiding the compressed gas.

[0029] For the specific structure of the gas guiding mechanism 8, please refer to [link / reference]. Figure 4The system includes a vertical hollow cylinder 81, with a bottom support base plate 82 integrally formed therewith at its bottom end. The upper surface of the vertical hollow cylinder 81 has a nitrogen compression chamber 83 with a downwardly concave structure and an open top. The bottom end of the nitrogen compression chamber 83 has a nitrogen limiting flow chamber 84, and the bottom end of the nitrogen limiting flow chamber 84 has a longitudinal rod through-hole 85. The bottom end of the longitudinal rod through-hole 85 has an oxygen compression chamber 86. The bottom end of the oxygen compression chamber 86... The vertical hollow cylinder 81 is provided with an oxygen limiting flow chamber 87. A nitrogen discharge channel 88 is provided on the circumferential surface of the vertical hollow cylinder 81, connecting the external space and one side of the nitrogen limiting flow chamber 84. A nitrogen intake channel 810 is provided on the circumferential surface of the vertical hollow cylinder 81, connecting the external space and the other side of the nitrogen limiting flow chamber 84. An oxygen discharge channel 89 is provided on the circumferential surface of the vertical hollow cylinder 81, connecting the external space and one side of the oxygen limiting flow chamber 87. On the other side of the oxygen limiting flow chamber 87, there is an oxygen intake channel 811. The vertical hollow cylinder 81 has a first gas check valve 812 installed inside the nitrogen discharge channel 88, a second gas check valve 813 installed inside the oxygen discharge channel 89, and a third gas check valve 815 installed inside the nitrogen intake channel 810. The vertical hollow cylinder 81 also has a... The fourth gas check valve 814 has a bottom surface area ratio of nine to one for the nitrogen compression chamber 83 and the oxygen compression chamber 86, and the depths of the nitrogen compression chamber 83 and 86 are the same. The inlet port of the first gas check valve 812 and the exhaust port of the third gas check valve 815 both face the nitrogen limiting flow chamber 84, and the inlet port of the second gas check valve 813 and the exhaust port of the fourth gas check valve 814 both face the oxygen limiting flow chamber 87.

[0030] To achieve the intake and compression of nitrogen and oxygen, please refer to [link / reference needed]. Figure 3 , Figure 5 and Figure 6 A gas compression mechanism 9 needs to be set up, which has an upper piston body 91 that can move longitudinally with the movable rod 7 and can realize the intake and compression of gas in the nitrogen compression chamber 83, and a lower piston body 92 that can move longitudinally with the movable rod 7 and can realize the intake and compression of gas in the oxygen compression chamber 86. The upper piston body 91 and the lower piston body 92 reciprocate longitudinally under the drive of the movable rod 7, thereby realizing the intake and compression of nitrogen and oxygen according to the piston movement principle.

[0031] For details regarding the specific structure of the gas compression mechanism 9, please refer to [link / reference]. Figure 5 and Figure 6 The system includes an upper piston 91 located inside a nitrogen compression chamber 83 and capable of moving axially along the nitrogen compression chamber 83, and a lower piston 92 located inside an oxygen compression chamber 86 and capable of moving axially along the oxygen compression chamber 86. The lower end face of the upper piston 91 and the upper end face of the lower piston 92 are connected by a longitudinal linkage shaft 93 that passes through a nitrogen limiting flow chamber 84 and a longitudinal rod through-hole 85. The ratio of the gas compression caused by the upper piston 91 moving downwards to the gas compression caused by the lower piston 92 moving downwards is nine to one. The longitudinal rod through-hole 85 is internally fitted with a device to prevent gas from moving along... The sealing ring leaks at the gap. A spherical fixing shell 94 is fixedly installed at the center of the upper end face of the upper piston body 91. The upper end face of the spherical fixing shell 94 is provided with a concave hemispherical mounting groove 95. A ball head 96 that can rotate freely is placed inside the hemispherical mounting groove 95. The top of the ball head 96 is provided with a rod fixing groove 97 for fixing and installing the bottom rod of the movable rod 7. The structural radius of the hemispherical mounting groove 95 matches the structural radius of the ball head 96, and the depth of the hemispherical mounting groove 95 is greater than the structural radius of the ball head 96.

[0032] To achieve the mixing of nitrogen and oxygen, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 and Figure 7 A gas mixing mechanism 10 is required, which has a spiral impeller structure 106 inside that can mix compressed nitrogen and oxygen in a turbulent manner. Oxygen and nitrogen entering through the three-way pipe 103 will enter the mixed gas flow chamber 102. After being turbulent by the airflow direction of the spiral impeller structure 106, nitrogen and oxygen are effectively mixed in a ratio of 90% and 10%, respectively, and then discharged into the grain storage tank.

[0033] For the specific structure of the gas mixing mechanism 10, please refer to [link / reference]. Figure 7 The system includes a transverse hollow structure 101, inside which a mixed gas flow chamber 102 is provided. One end of the transverse hollow structure 101 is provided with a three-way pipe 103 connecting one end of the mixed gas flow chamber 102, a nitrogen emission channel 88, and an oxygen emission channel 89. The other end of the transverse hollow structure 101 is provided with a mixed gas emission channel 107 connecting the external space and the other end of the mixed gas flow chamber 102. A central flow divider 104 is provided at the axis of the mixed gas flow chamber 102. Both ends of the central flow divider 104 are provided with tip structures 105 for guiding airflow. An integral spiral impeller structure 106 is provided between the rod body of the central flow divider 104 and the circumferential inner wall of the mixed gas flow chamber 102.

[0034] In use, the bottom support base plate 82 and the motor fixing bushing 1 are fixedly installed on the corresponding component surfaces at a reasonable height. Then, the nitrogen compression chamber 83 and the exhaust port of the nitrogen storage tank are connected through a pipe, and the oxygen intake channel 811 and the exhaust port of the oxygen storage tank are connected through a pipe. Finally, the mixed gas discharge channel 107 is connected to the air inlet of the grain storage tank through a pipe. The drive motor 2 is started, and the rotor 3 drives the rotating disk 4 to rotate. According to the piston movement principle, the movable rod 7 can drive the upper piston body 91 and the lower piston body 92 to perform reciprocating push-pull movements. At this time, nitrogen is drawn into the nitrogen storage tank through the nitrogen intake channel 810. The oxygen is drawn into the oxygen compression chamber 86 through the oxygen intake channel 811. After compression, the nitrogen is discharged into the three-way pipe 103 through the nitrogen discharge channel 88. Similarly, the oxygen is discharged into the three-way pipe 103 through the oxygen discharge channel 89. The nitrogen and oxygen are mixed in a ratio of 90% and 10%. The oxygen and nitrogen entering through the three-way pipe 103 will enter the mixed gas flow chamber 102. After the airflow is turbulent by the spiral impeller structure 106, the nitrogen and oxygen are effectively mixed in a ratio of 90% and 10%. After mixing, the mixture is discharged into the grain storage tank.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protective gas injection device for a grain storage tank, comprising a drive motor (2) installed in a motor fixed bushing (1), a rotating disk (4) fixedly installed at the end of a rotor (3) of the drive motor (2), a rotating rod (5) fixedly installed on one end face of the rotating disk (4), a bushing (6) mounted on the circumferential surface of the rotating rod (5) via bearings, and a movable rod (7) fixedly installed on the bottom circumferential surface of the bushing (6), characterized in that: It also includes, The gas guiding mechanism (8) is provided with a nitrogen compression chamber (83) for drawing nitrogen from the outside and compressing and discharging it to one side, and an oxygen compression chamber (86) for drawing oxygen from the outside and compressing and discharging it to one side. The gas compression mechanism (9) is provided with an upper piston body (91) that can move longitudinally with the movable rod (7) and can realize the intake and compression discharge of gas in the nitrogen compression chamber (83), and a lower piston body (92) that can move longitudinally with the movable rod (7) and can realize the intake and compression discharge of gas in the oxygen compression chamber (86). And a gas mixing mechanism (10), which is provided with a spiral impeller structure (106) that can mix compressed nitrogen and oxygen in a turbulent manner. The rotating rod (5) is fixedly installed on one side away from the axis of the rotating disk (4); The gas guiding mechanism (8) includes a vertical hollow cylinder (81). The bottom end of the vertical hollow cylinder (81) is provided with a bottom support base plate (82) integrally formed with it. The upper end face of the vertical hollow cylinder (81) is provided with a nitrogen compression chamber (83) with a downward concave structure and an open top. The bottom end of the nitrogen compression chamber (83) is provided with a nitrogen limiting flow chamber (84). The bottom end of the nitrogen limiting flow chamber (84) is provided with a longitudinal rod perforation (85). The bottom end of the longitudinal rod perforation (85) is provided with an oxygen compression chamber (86). The bottom end of the oxygen compression chamber (86) is provided with an oxygen limiting flow chamber (87). The circumferential surface of the vertical hollow cylinder (81) is provided with a nitrogen discharge channel (88) connecting the external space and one side of the nitrogen limiting flow chamber (84). The circumferential surface of the vertical hollow cylinder (81) is provided with a nitrogen discharge channel (88) connecting the external space and the nitrogen limiting flow chamber (84). 84) On the other side, there is a nitrogen intake channel (810). The circumferential surface of the vertical hollow cylinder (81) is provided with an oxygen discharge channel (89) that connects the external space and one side of the oxygen limiting flow cavity (87). The circumferential surface of the vertical hollow cylinder (81) is provided with an oxygen intake channel (811) that connects the external space and the other side of the oxygen limiting flow cavity (87). The vertical hollow cylinder (81) has a first gas check valve (812) installed inside the nitrogen discharge channel (88). The vertical hollow cylinder (81) has a second gas check valve (813) installed inside the oxygen discharge channel (89). The vertical hollow cylinder (81) has a third gas check valve (815) installed inside the nitrogen intake channel (810). The vertical hollow cylinder (81) has a fourth gas check valve (814) installed inside the oxygen intake channel (811). The bottom surface area of ​​the nitrogen compression chamber (83) is nine times that of the bottom surface area of ​​the oxygen compression chamber (86), and the depth of the nitrogen compression chamber (83) is the same as that of the oxygen compression chamber (86). The gas compression mechanism (9) includes an upper piston (91) located inside the nitrogen compression chamber (83) and capable of moving along the axial direction of the nitrogen compression chamber (83), and a lower piston (92) located inside the oxygen compression chamber (86) and capable of moving along the axial direction of the oxygen compression chamber (86). The lower end face of the upper piston (91) and the upper end face of the lower piston (92) are connected by a longitudinal linkage shaft (93) that passes through the nitrogen limiting flow chamber (84) and the longitudinal rod through hole (85). A sealing ring is embedded inside the longitudinal rod through hole (85) to prevent gas leakage along the gap.

2. The protective gas injection device for grain storage tanks according to claim 1, characterized in that: The inlet port of the first gas check valve (812) and the exhaust port of the third gas check valve (815) are both facing the nitrogen limiting flow chamber (84).

3. The protective gas injection device for a grain storage tank according to claim 2, characterized in that: The inlet port of the second gas check valve (813) and the exhaust port of the fourth gas check valve (814) are both facing the oxygen limiting flow chamber (87).

4. The protective gas injection device for a grain storage tank according to claim 3, characterized in that: A spherical fixing shell (94) is fixedly installed at the center of the upper end face of the upper piston body (91). The upper end face of the spherical fixing shell (94) is provided with a concave hemispherical mounting groove (95). A ball head (96) that can rotate freely is placed inside the hemispherical mounting groove (95) of the spherical fixing shell (94). The top of the ball head (96) is provided with a rod fixing groove (97) for fixing and installing the bottom rod of the movable rod (7).

5. The protective gas injection device for a grain storage tank according to claim 4, characterized in that: The ratio of the amount of gas compression caused by the upper piston (91) moving downward to the amount of gas compression caused by the lower piston (92) moving downward is nine to one.

6. The protective gas injection device for a grain storage tank according to claim 5, characterized in that: The structural radius of the hemispherical mounting groove (95) matches the structural radius of the ball head (96), and the depth of the hemispherical mounting groove (95) is greater than the structural radius of the ball head (96).

7. A protective gas injection device for a grain storage tank according to claim 6, characterized in that: The gas mixing mechanism (10) includes a transverse hollow structure (101), inside which a mixed gas flow chamber (102) is provided. One end of the transverse hollow structure (101) is provided with a three-way pipe (103) connecting one end of the mixed gas flow chamber (102), a nitrogen emission channel (88), and an oxygen emission channel (89). The other end of the transverse hollow structure (101) is provided with a mixed gas emission channel (107) connecting the outside space and the other end of the mixed gas flow chamber (102). A central flow divider (104) is provided at the axis of the mixed gas flow chamber (102) in the transverse hollow structure (101). Both ends of the central flow divider (104) are provided with tip structures (105) for guiding airflow. An integral spiral impeller structure (106) is provided between the rod body of the central flow divider (104) and the inner circumferential wall of the mixed gas flow chamber (102).

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