CN108479592B

CN108479592B - Self-rotating type ventilation stirring device

Info

Publication number: CN108479592B
Application number: CN201810223557.XA
Authority: CN
Inventors: 李富柱; 范海洋; 陈智鹏; 蒋鹏赟; 谭中锐; 王匀; 李伟
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2018-03-19
Filing date: 2018-03-19
Publication date: 2020-01-24
Anticipated expiration: 2038-03-19
Also published as: CN108479592A

Abstract

The invention discloses an autorotation type ventilation stirring device in the field of fluid medium mixing stirring.A primary stirring mechanism consists of a five-way body and four rotating blades, a secondary stirring mechanism consists of a six-way body and four rotating blades, four side surfaces of the five-way body are respectively connected and communicated with the inner end of one rotating blade, and the bottom surface of the five-way body is communicated with the top surface of the six-way body; the four side surfaces of the six-way body are respectively connected and communicated with the inner end of one rotating blade, the bottom surface of the six-way body is communicated with a secondary connecting pipe, and pressure gas enters from a central through hole below the secondary connecting pipe; each rotating blade is a hollow pipe fitting which is horizontally and radially arranged, the middle section is a straight pipe section, and the outer end of each rotating blade is a straight elbow which is straightly bent towards a rotating direction; a plurality of first exhaust hole groups are arranged on the end surface of the straight elbow of each four rotating blades, and a plurality of second exhaust hole groups are arranged on the semi-circular arc surface of the middle section of the straight pipe section, which is at the same side as the end surface of the straight elbow; the pressure gas in the pipe is directly utilized to drive the stirring device to mix and stir, and the stirring device has the dual advantages of ventilation stirring and mechanical stirring.

Description

Self-rotating type ventilation stirring device

Technical Field

The invention belongs to the stirring technology of various substances, is particularly suitable for the field of fluid medium mixing and stirring, and relates to a ventilating and stirring device which is particularly suitable for the processes of gas-liquid two-phase mixing, gas-liquid-solid three-phase mixing, gas absorption reaction and the like under the operation of large air quantity.

Background

Stirring can make two or more different substances mutually disperse in each other, accelerate the heat transfer and mass transfer processes, thereby achieving the purpose of uniform mixing. Therefore, as a process, stirring is widely used not only in chemical industry, but also in biological, medical, food, fiber, paper, petroleum, water treatment and other industries. The stirring device is a core component in the stirring process, and the performance of the stirring device directly influences the stirring effect and the quality of the next process.

In industry, stirring can be divided into mechanical stirring and gas-flow stirring. Compared with mechanical stirring, airflow stirring mainly utilizes the bubbling action of gas to stir substances needing to be uniformly mixed or utilizes the ascending process of airflow to stir the mixed substances. However, the air flow stirring is not only weak in action and long in stirring time, but also is difficult to adapt to the operation of mixing high-concentration fluid and solid substances, and the air flow stirring easily pollutes the environment when corrosive and toxic substances are mixed, so that mechanical stirring is often adopted for material mixing and stirring in industrial production. However, the mechanical stirring has the problems of high investment cost, difficult maintenance, easy vibration, existence of a stirring blind area and the like. With the intensive research on the processes of gas dispersion, solid suspension and the like and the vigorous development of polymerization engineering and biochemical engineering, the requirements for uniformly mixing and stirring gas-liquid two phases and gas-liquid-solid three phases in the processes of aerobic cell culture and the like in bioengineering are higher and higher, and especially, the stirring technology meeting the requirements is more required in the fields of biology, food, medical engineering and the like which need to fully mix air and culture solution and promote oxygen dissolution. However, whether the gas flow stirring or the mechanical stirring is adopted, a single stirring mode is difficult to meet the requirement of a specific technological process, and the adoption of the mode of combining the two types of stirring can not only realize uniform stirring of substances, but also realize higher dissolved oxygen rate.

The stirring shaft disclosed in the document with the Chinese patent publication No. CN206368153U and the name of stirring shaft for fermentation tank adopts three stirring components, which are beneficial to the uniform stirring of fermentation liquor, but the stirring shaft has a single structural function, and not only needs an independent gas transmission component to realize the sufficient dissolution of oxygen, but also needs a driving motor of the stirring shaft. Chinese patent publication No. CN106396754A, the name "a fermentation equipment with improved stirring breather and its method of use" discloses a stirring shaft, a stirring component of a rotten layer, a stirring component of a fermentation layer, a stirring component of a preheating layer, etc., through the stirring to the fermentation equipment, the ventilation structure improves, make the stirring, ventilate more abundant, thereby can reach better fermentation effect, but its structure is relatively fixed, it builds up to be difficult to assemble according to the height of the jar body, do not have the flexibility, and the rotation of stirring shaft still needs external motor to drive, not only increase the equipment input, and make the equipment maintenance difficult.

Disclosure of Invention

In order to overcome the defects of fixed structure, single function, need of independently arranging a power source and the like of the existing stirring device, the invention provides a multi-adaptive self-rotating type ventilation stirring device which combines ventilation stirring and mechanical stirring into a whole without the need of motor driving.

In order to achieve the purpose, the technical scheme adopted by the self-rotating type ventilation stirring device is as follows: the device is provided with a primary stirring mechanism and a secondary stirring mechanism, wherein the primary stirring mechanism consists of a five-way body and four rotating blades, the secondary stirring mechanism consists of a six-way body and four rotating blades, cavities are formed in the five-way body and the six-way body, the four side surfaces of the five-way body are respectively connected and communicated with the inner end of one rotating blade, and the bottom surface of the five-way body is connected and communicated with the top surface of the six-way body through a first rotating assembly, a primary connecting pipe and a second rotating assembly in sequence; the four side surfaces of the six-way body are respectively connected and communicated with the inner end of one rotating blade, the bottom surface of the six-way body is connected and communicated with a second-stage connecting pipe through a third rotating assembly and the second-stage connecting pipe, and pressure gas enters from a central through hole below the second-stage connecting pipe; each rotating blade is a hollow pipe fitting which is horizontally and radially arranged, the middle section is a straight pipe section, and the outer end of each rotating blade is a straight elbow which is straightly bent towards a rotating direction; the end face of the straight elbow of each four rotating blades is provided with a plurality of first exhaust hole groups, and the semi-circular arc surface of the middle section of the straight pipe section, which is at the same side as the end face of the straight elbow, is provided with a plurality of second exhaust hole groups.

Furthermore, the second exhaust hole group consists of 2-4 rows of exhaust holes from top to bottom, and the first exhaust hole group consists of 7-9 exhaust holes which are uniformly distributed along the circumferential direction.

Further, the aperture of each row of exhaust holes in the second exhaust hole group 18 increases from inside to outside, and the vertical distance between two adjacent rows of exhaust holes increases from inside to outside.

After the technical scheme is adopted, the invention has the beneficial effects that:

(1) the invention can directly utilize the pressure gas in the pipe to drive the stirring device to mix and stir, combines the characteristics of airflow type stirring and mechanical type stirring, has the dual advantages of ventilation stirring and mechanical type stirring, not only reduces the equipment investment, but also improves the compactness of the structure, and also has the advantages of energy saving, environmental protection and the like.

(2) The stirring mechanism, the rotating assembly and the stirring blades are all of an assembly type structure, a large number of standard elements can be adopted and can be disassembled, and the disassembly, the assembly, the cleaning and the maintenance of the stirring mechanism are simple and convenient. It is worth noting that the invention also has the characteristic of any assembly, the size of the stirring device can be changed and the number of the stirring mechanisms can be increased according to the requirement of working conditions, so as to increase the number of the stirring layers, and the assembly connection and the multi-stage stirring are carried out, so that the device has greater flexibility and universality.

(3) The invention can adapt to mixing and stirring processes of different types and different purposes, is not only suitable for gas-liquid two-phase reaction, but also suitable for gas-liquid-solid three-phase reaction and other forms of stirring processes.

Drawings

The invention is described in further detail below with reference to the following figures and detailed description:

FIG. 1 is a perspective view of an auto-rotating aeration stirring apparatus according to the present invention;

FIG. 2 is a front sectional view of the self-rotating aeration stirring device of the present invention;

FIG. 3 is an enlarged cross-sectional view of the rotary assembly of FIG. 1;

FIG. 4 is an enlarged front view of a single rotating blade of FIG. 1;

FIG. 5 is an enlarged view of a portion of the second set of exhaust holes of FIG. 4;

in the figure: 1. a five-way body; 2. a first rotating blade; 3. a second rotating blade; 4. a third rotating blade; 5. a fourth rotating blade; 6. a first group of exhaust holes; 7. a bearing end cap; 8. a bearing; 9. a transition joint; 10. a monofilament male connector; 11. a double-ended straight joint; 12. a primary connecting pipe; 13. a six-way body; 14. a fifth rotating leaf; 15. a sixth rotating blade; 16. a seventh rotating leaf; 17. an eighth rotating leaf; 18. a second group of exhaust holes; 19. a secondary connecting pipe; 101. a primary stirring mechanism; 102. a first rotating assembly; 103. a second rotating assembly; 104. a second-stage stirring mechanism; 105. and a third rotating assembly.

Detailed Description

Referring to fig. 1 to 2, the present invention includes, in order from top to bottom, a primary stirring mechanism 101, a first rotating component 102, a primary connecting pipe 12, a second rotating component 103, a secondary stirring mechanism 104, a third rotating component 105, and a secondary connecting pipe 19. All the connecting pipes, the rotating assemblies and the stirring mechanisms have the same central axis, and the insides of the connecting pipes, the rotating assemblies and the stirring mechanisms are communicated.

The primary stirring mechanism 101 is composed of a five-way body 1 and four rotating blades. The four rotating blades are hollow short pipe fittings, namely a first rotating blade 2, a second rotating blade 3, a third rotating blade 4 and a fourth rotating blade 5. The five-way body 1 is of a square structure, a cavity is arranged in the five-way body, through holes are respectively processed on four side surfaces and a bottom surface of the five-way body, the diameters of the through holes on the four side surfaces are the same, and each side surface is fixedly and hermetically connected with and communicated with one rotating blade through the through hole, so that the four

rotating blades

2, 3, 4 and 5 are communicated with an inner cavity of the five-way body 1. The respective connecting portions are subjected to sealing treatment, thereby forming the primary stirring mechanism 101. The four

rotating blades

2, 3, 4 and 5 have the same structure and are uniformly arranged along the circumferential direction, and the central lines of the four rotating blades intersect at the same circle center and are horizontally arranged along the rotating diameter direction. The corresponding connection parts of the four

rotating blades

2, 3, 4 and 5 and the through hole of the five-way body 1 are inner ends with internal threads. The middle sections of the four

rotating blades

2, 3, 4 and 5 are straight pipe sections, the outer ends of the four rotating blades are straight elbows, and each elbow is bent straight towards a rotating direction, so that a five-way body 1 and a rotating blade assembly which are communicated with each other inside are formed.

A plurality of first exhaust hole groups 6 are arranged on the end faces of straight elbows at the outer ends of four

rotating blades

2, 3, 4 and 5, a plurality of second exhaust hole groups 18 are arranged on the middle section straight pipe sections of the four

rotating blades

2, 3, 4 and 5 and on the semi-arc surface at the same side with the end faces of the straight elbows, the second exhaust hole groups 18 on the straight pipe sections of the rotating blades are composed of upper and lower 2-4 exhaust holes, the first exhaust hole groups 6 on the end faces of the straight elbows of the rotating blades are composed of 7-9 exhaust holes, and the 7-9 exhaust holes are uniformly distributed in the circumferential direction.

The bottom surface of the five-way body 1 is fixedly and hermetically connected and communicated with the upper end of the first rotating component 102 through a through hole thereof, the lower end of the first rotating component 102 is connected with the upper end of the second rotating component 103 through the primary connecting pipe 12, and the lower end of the second rotating component 103 is connected and communicated with the secondary stirring mechanism 104.

The structure of the secondary stirring mechanism 104 is composed of a six-way body 13 and four rotating blades. The structure of the six-way body 13 is similar to that of the five-way body 1, and the difference from the five-way body 1 is that each side surface of the six-way body 13 is respectively provided with a through hole, and the top surface of the six-way body 13 is connected and communicated with the lower end of the second rotating assembly 103 through the through hole. The four rotating blades of the second-stage stirring mechanism 104 are the fifth rotating blade 14, the sixth rotating blade 15, the seventh rotating blade 16 and the eighth rotating blade 17, respectively, and are identical in structure and arrangement with the four rotating blades of the first-stage stirring mechanism 101, and the first exhaust hole group 6 and the second exhaust hole group 18 arranged on the four rotating blades of the second-stage stirring mechanism 104 are also identical in exhaust hole group on the four rotating blades of the first-stage stirring mechanism 101. The bottom surface of the hexagonal body 13 is hermetically connected and communicated with the upper end of the third rotating assembly 105 through the through hole thereof, the lower end of the third rotating assembly 105 is hermetically connected and communicated with the upper end of the second-stage connecting pipe 19, and gas is introduced from the lower end of the second-stage connecting pipe 19.

Referring to fig. 2 and 3, the first rotating assembly 102, the second rotating assembly 103, and the third rotating assembly 105 are identical in structure. Taking the first rotating assembly 102 as an example, it is composed of a bearing end cover 7, a bearing 8, a transition joint 9, a monofilament male joint 10 and a double-headed through joint 11. The middle of the monofilament external thread joint 10 is a central through hole which is through up and down, and the upper end of the monofilament external thread joint is fixedly connected with a through hole on the bottom surface of the five-way body 1 through an external thread. The middle section of the monofilament external thread joint 10 is fixedly sleeved with a bearing 8 and fixed together with the inner ring of the bearing 8, the outer ring of the bearing 8 is fixed together with the upper end of a transition joint 9, and the transition joint 9 is used as a bearing seat of the bearing 8. The upper section of the transition joint 9 is fixedly connected with the bearing end cover 7 through the inner and outer screws. The opening of the bearing end cover 7 faces downwards, the inner side surface of the bearing end cover is provided with internal threads which are connected with the external threads of the transition joint 9, the end cover of the bearing end cover 7 is provided with a through hole, and the monofilament external thread joint 10 upwards penetrates through the through hole on the end cover of the bearing end cover 7. The lower end of the transition joint 9 is fixedly connected with the lower end of the double-head straight joint 11 through internal and external threads, and the lower end of the double-head straight joint 11 is fixedly connected with the upper end of the first-stage connecting pipe 12. The transition joint 9 and the double-head straight-through joint 1 are both provided with central holes which are communicated up and down, and the transition joint 9 is communicated with the central holes of the double-head straight-through joint 1. The bearing cap 7, transition joint 9 and double-ended straight through joint 11 all remain stationary as the monofilament pin 10 rotates. The joints of the bearing end cap 7, the bearing 8, the transition joint 9, the monofilament male connector 10 and the double-headed through-joint 11 are sealed to form a first rotating assembly 102.

Referring to fig. 4 and 5, the present invention has eight identical rotating blades, the second exhaust hole group 18 on the middle section straight pipe section of each rotating blade increases the aperture of each exhaust hole from inside to outside in the horizontal radial direction, and D_k+1=(1+0.04)D_k，D_kAnd D_k+1Respectively, the diameters of the k-th inner exhaust hole and the (k + 1) -th outer exhaust hole adjacent in sequence. The horizontal distance between the adjacent two air vent holes inside and outside is the same and is d. The ratio of the horizontal spacing d to the rotating blade lumen diameter B is in the range of 0.2-0.3, i.e., d/B = 0.2-0.3. Diameter D of the first vent hole located at the innermost side₁The ratio of the diameter of the inner cavity B of the rotating blade is within the range of 0.15-0.2, namely D₁and/B = 0.15-0.2. A pressure differential exists as the gas is discharged from the second set of exhaust holes 18.

The second exhaust hole group 18 is provided with 2-4 rows of exhaust holes, and the upper and lower distances between two adjacent rows of exhaust holes are sequentially increased from inside to outside, namely H_k+1=(1+0.04) H_k，H_kIs the up-down distance of the k-th adjacent two rows of exhaust holes, H_k+1The distance between the upper and lower parts of the k +1 th adjacent two rows of exhaust holes. The vertical distance H between the two adjacent rows of exhaust holes at the innermost side₁The ratio of the diameter of the inner cavity B of the rotating blade to the diameter of the inner cavity B of the rotating blade is within the range of 0.2-0.25, namely H₁/B=0.2-0.25。

The number of the first exhaust holes 6 on the end face of the straight elbow of the rotating blade is 7-9, the aperture of each exhaust hole is the same and is C, and the ratio of the aperture to the diameter B of the inner cavity of the rotating blade is in the range of 0.25-0.3, namely C/B = 0.25-0.3.

The straight elbows at the outer ends of the eight rotating blades are all straight elbows clockwise or anticlockwise, namely in a fan blade form. The ratio of the rotating diameter E of the eight rotating blades to the total height F of the device according to the invention is in the range 0.4-0.5, i.e. E/F = 0.4-0.5. The total height F of the device is the distance between the upper end surface of the five-way body 1 and the lower end surface of the secondary connecting pipe 19. The ratio of the rotating blade inner cavity diameter B to the rotating blade rotating diameter E is in the range of 0.1-0.15, namely B/E = 0.1-0.15. The rotating diameter E of the rotating blade is the radial distance from the central axis of the device of the present invention to the outermost end of the rotating blade.

As shown in fig. 1-5, in the operation of the present invention, the pressurized gas enters from the central through hole below the secondary connecting pipe 19, and then the pressurized gas passes upward through the double-headed through joint 11, the transition joint 9 and the monofilament male connector 10 in the third rotating group 105, and enters into the secondary stirring mechanism 104. A part of the gas enters the fifth rotating blade 14, the sixth rotating blade 15, the seventh rotating blade 16 and the eighth rotating blade 17 through the four side through holes of the six-way body 13 of the two-stage stirring mechanism 104, and is then ejected from the second exhaust hole group 18 of the four rotating blades. Another part of the gas flows upward from the upper through hole of the six-way body 13, passes through the monofilament male connector 10, the transition connector 9 and the double-headed through connector 11 in the second rotating block 103, then passes through the primary connecting pipe 12, and then passes through the double-headed through connector 11, the transition connector 9 and the monofilament male connector 10 in the first rotating block 102, thereby entering the primary stirring mechanism 101. The residual pressure gas respectively enters the first rotating blade 2, the second rotating blade 3, the third rotating blade 4 and the fourth rotating blade 5 through four side through holes of the five-way body 1 and then is sprayed out of the first exhaust hole group 6 of the four rotating blades.

When the pressure gas enters from the lower through hole of the secondary connection pipe 19, the secondary connection pipe 19 remains fixed. When the pressure gas is respectively sprayed out from the second exhaust hole group 18 on the second-stage stirring mechanism 104 and the first exhaust hole group 6 on the first-stage stirring mechanism 101, a reverse acting force is given to the rotating blades due to the thrust action of the gas, so that the second-stage stirring mechanism 104 and the first-stage stirring mechanism 101 are pushed to rotate clockwise or anticlockwise. Because the external monofilament thread joint 10 in the third rotating assembly 105 is in threaded connection with the six-way body 13, and the external monofilament thread joint 10 is in interference fit with the inner ring of the bearing 8, the external monofilament thread joint 10 and the inner ring of the bearing 8 in the third rotating assembly 105 move together with the secondary stirring mechanism 104. In the third rotating assembly 105, the outer ring of the bearing 8 is in interference fit with the transition joint 9, the bearing end cover 7 is in threaded connection with the transition joint 9, the transition joint 9 is in threaded connection with the double-head through joint 11, and the double-head through joint 11 is in threaded connection with the second-stage connecting pipe 19. The third rotating group 105 remains stationary except for the movement of the monofilament pin 10 together with the inner race of the bearing 8 and the secondary stirring mechanism 104. Since the first rotating assembly 102, the second rotating assembly 103 and the third rotating assembly 105 have the same structure, the monofilament male connector 10 and the inner ring of the bearing 8 in the second rotating assembly 103 move together with the secondary stirring mechanism 104. The monofilament male screw joint 10 and the inner ring of the bearing 8 in the first rotating member 102 move together with the primary stirring mechanism 101. While the other components of second rotating assembly 103 and first rotating assembly 102 remain stationary. Primary connecting pipe 12 is threadedly connected to double-headed union-thru 11 of first rotating group 102 and second rotating group 103 so that primary connecting pipe 12 also remains stationary.

When the pressure gas is sprayed out of the exhaust hole, the ascending air flow can be utilized to drive the liquid to be stirred, and thus, the airflow type stirring is realized. In addition, the pressure gas can also drive the stirring device to rotate, so that mechanical stirring is realized by utilizing the rotation of the stirring device, and the aim of combining airflow stirring and mechanical stirring is finally fulfilled, thus not only reducing equipment investment, but also improving the compactness of the structure.

Claims

1. An auto-rotating formula agitating unit that ventilates, characterized by: the stirring device is provided with a first-stage stirring mechanism (101) and a second-stage stirring mechanism (104), wherein the first-stage stirring mechanism (101) consists of a five-way body (1) and four rotating blades, the second-stage stirring mechanism (104) consists of a six-way body (13) and four rotating blades, cavities are formed in the five-way body (1) and the six-way body (13), four side surfaces of the five-way body (1) are respectively connected and communicated with the inner end of one rotating blade, and the bottom surface of the five-way body (1) is connected and communicated with the top surface of the six-way body (13) through a first rotating assembly (102), a first-stage connecting pipe (12) and a second rotating assembly (; the four side surfaces of the six-way body (13) are respectively connected and communicated with the inner end of one rotating blade, the bottom surface of the six-way body is connected and communicated with the second-stage connecting pipe (19) through a third rotating assembly (105) and the second-stage connecting pipe (19), and pressure gas enters from a central through hole below the second-stage connecting pipe (19); each rotating blade is a hollow pipe fitting which is horizontally and radially arranged, the middle section is a straight pipe section, and the outer end of each rotating blade is a straight elbow which is straightly bent towards a rotating direction; a plurality of first exhaust hole groups (6) are arranged on the end surface of the straight elbow of each four rotating blades, and a plurality of second exhaust hole groups (18) are arranged on the semi-circular arc surface of the middle section of the straight pipe section on the same side with the end surface of the straight elbow;

the structure of the first rotating component (102), the structure of the second rotating component (103) and the structure of the third rotating component (105) are completely the same, taking the first rotating component (102) as an example, the first rotating component (102) consists of a bearing end cover (7), a bearing (8), a transition joint (9), a monofilament external thread joint (10) and a double-head straight-through joint (11), a central through hole which is through up and down is arranged in the middle of the monofilament external thread joint (10), the upper end of the monofilament external thread joint is fixedly connected with a through hole on the bottom surface of the five-way body (1) through an external thread, a bearing (8) is fixedly sleeved outside the middle section of the monofilament external thread joint (10) and is fixed with the inner ring of the bearing (8), the outer ring of the bearing (8) is fixed with the upper end of the transition joint (9), the upper section of the transition joint (9) is fixedly connected with the bearing end cover (7) through the internal thread and, the end cover of the bearing end cover (7) is provided with a through hole, the monofilament external thread joint (10) upwards penetrates through the through hole in the end cover of the bearing end cover (7), the lower end of the transition joint (9) is fixedly connected with the lower end of the double-head straight joint (11) through internal and external threads, and the lower end of the double-head straight joint (11) is fixedly connected with the upper end of the first-stage connecting pipe (12).

2. An autorotative aeration blending device according to claim 1 further comprising: the second exhaust hole group (18) is composed of an upper 2-4 rows of exhaust holes, and the first exhaust hole group (6) is composed of 7-9 exhaust holes which are uniformly distributed along the circumferential direction.

3. An autorotative aeration blending device according to claim 2 further comprising: the aperture of each row of exhaust holes in the second exhaust hole group (18) is sequentially increased from inside to outside, and the upper and lower distances between two adjacent rows of exhaust holes are sequentially increased from inside to outside.

4. An autorotative aeration blending device according to claim 3 wherein: diameter D of the (k + 1) th exhaust hole in the second exhaust hole group (18)_k+1=(1+0.04)D_k，D_kIs the diameter of the adjacent k-th vent hole inside the k + 1-th vent hole.

5. An autorotative aeration blending device according to claim 4 further comprising: the up-down distance H of the k +1 th two adjacent rows of exhaust holes of the second exhaust hole group (18)_k+1=(1+0.04) H_k，H_kIs the up-down distance of the k-th adjacent two rows of exhaust holes.

6. An autorotative aeration blending device according to claim 3 wherein: the ratio of the up-down distance of two adjacent rows of exhaust holes at the innermost side of the second exhaust hole group (18) to the diameter of the inner cavity of the rotating blade is in the range of 0.2-0.25.

7. An autorotative aeration blending device according to claim 1 further comprising: the ratio of the aperture of each exhaust hole of the first exhaust hole group (6) to the diameter of the inner cavity of the rotating blade is in the range of 0.25-0.3.

8. An autorotative aeration blending device according to claim 1 further comprising: the ratio of the rotating diameter of each rotating blade to the distance from the upper end surface of the five-way body (1) to the lower end surface of the secondary connecting pipe (19) is within the range of 0.4-0.5.