CN101905130B - Mixing and stirring device with heating function - Google Patents

Abstract

The invention discloses a mixing and stirring device with heating function, which comprises a rotating shaft and a stirring paddle, the stirring paddle is connected with the rotating shaft through spokes; the rotating shaft, the spokes and the stirring paddle are all hollow structures, and the hollow parts of the three are connected; is the open end, and the lower end is the closed end. The impeller is composed of multiple paddle units connected in series: multiple paddle units are located between two circular hollow tubes arranged up and down, and the upper and lower ends of multiple paddle units are connected in series through two circular hollow tubes. together; the rotating shaft is located inside the two circular hollow tubes, spokes are arranged between the two circular hollow tubes and the rotating shaft, and inner ring hollow paddles are arranged between each pair of upper and lower corresponding spokes. The present invention changes the static steam coil structure in the mixing vessel in the prior art into a steam hollow paddle that rotates in the central stirring shaft, which can quickly compensate for the temperature drop caused by the normal-temperature powder material to the melt, and can also reduce the temperature of the compound material. Mix the slurry evenly.

Description

A mixing and stirring device with heating function

technical field

The invention belongs to the technical field of chemical equipment, and relates to a heating, stirring and mixing device for melt slurry containing a large amount of suspended solids.

Background technique

In the chemical fertilizer melt granulation process, the material containing nitrogen (urea or ammonium nitrate) is first melted, and then mixed with the powder material containing phosphorus (monoammonium phosphate) and potassium containing powder heated to the process temperature. The powder material (potassium chloride or potassium sulfate) is stirred by the mixing device and mixed into a flowable liquid composite slurry with a certain temperature, and then the mixed slurry is sprayed into the mixture in the form of droplets through a special granulation nozzle In the cooling medium, the refrigerant can be a gas or a liquid immiscible with the material. The liquid droplets automatically shrink into spherical solid particles during the process of contacting and cooling with the refrigerant.

At present, the mixing device of this process adopts the structure of the vertical axis stirring paddle in the center of the kettle type container. Its working principle is: the molten liquid (urea or ammonium nitrate) and various powder materials that reach the temperature required by the process are continuously continuous according to the proportion. into the mixing container, under the action of the stirring device, the liquid-solid phase materials quickly form a composite liquid slurry, and the slurry makes a circular motion with the direction of rotation of the stirring blades to form a concave vortex with the center of the stirring axis as the center, and falls into the The powder material above the slurry is immediately drawn into the vortex flow and tumbling and turbulent with the stirring blades to achieve the purpose of rapid and complete mixing of the liquid and solid phases. The orifice enters the next granulation process.

Due to various reasons, many users removed the two sets of special powder heating devices for heating monoammonium phosphate and potassium salt in the early process design, and instead increased the volume of the mixing container, and arranged a certain area in the mixing container. The steam coil uses the area of the steam coil and the temperature of the high-pressure steam to make up for the temperature drop caused by the normal temperature powder material to the melt. Because this method has certain practical value, it was widely used in the industry soon, but this method also has some shortcomings, such as the arrangement of a certain area of steam coils in the mixing vessel, it is bound to increase the volume of the mixing vessel , increasing the volume of the mixing container will inevitably prolong the residence time of the material in the mixing container, and according to the physical and chemical principles, urea and monoammonium phosphate will undergo a chemical reaction, resulting in the polymerization of monoammonium phosphate to form ammonium polyphosphate melt, which will increase the viscosity of the slurry It increases sharply with the prolongation of time, so the process does not want the material to stay in the mixing container for too long; for example, because a certain area of steam coil is arranged in the mixing container, it is bound to increase the resistance to fluid movement. , in order to ensure the mixing effect of materials in the mixing container, it is necessary to increase the end speed and power of the stirring paddle; another example is that a certain area of steam coil is arranged in the mixing container, which will cause certain difficulties for cleaning and maintenance. Especially when the user needs to change the formula structure of the product, such as changing the urea base to nitro base, or when the steam coil leaks due to abrasion and other reasons and needs to be overhauled.

Contents of the invention

The purpose of the present invention is to provide a mixing paddle with heating function, which changes the static steam coil structure in the mixing container in the prior art into a steam hollow paddle with a rotating central stirring shaft, which can quickly make up for normal temperature powder The temperature drop caused by the material to the melt can also uniformly mix the composite slurry.

The technical scheme adopted in the present invention is: a mixing and stirring device with heating function, including a rotating shaft and a stirring paddle, the stirring paddle is connected to the rotating shaft through spokes; the rotating shaft, the spokes and the stirring paddle are all hollow structures, and the hollow parts of the three are connected ; The upper end of the rotating shaft is an open end, and the lower end is a closed end.

The impeller is composed of multiple paddle units connected in series: multiple paddle units are located between two circular hollow tubes arranged up and down, and the upper ends of multiple paddle units are connected in series through the upper circular hollow tube Together, the lower ends are connected in series through the circular hollow tubes located below; the rotating shaft is located inside the two circular hollow tubes, and the upper and lower spokes are respectively arranged between the two circular hollow tubes and the rotating shaft; the number of upper and lower spokes Each pair of up and down corresponding spokes is located on the same vertical plane and parallel to each other, and an inner ring hollow paddle is arranged between each pair of up and down corresponding spokes.

Wherein, each paddle unit includes two outer-ring hollow paddles; the two upper ends and two lower ends of the two outer-ring hollow paddles are respectively connected by elbows; the upper and lower circular hollow tubes pass through the The elbows at the upper and lower ends of each blade unit connect the upper and lower ends of each blade unit in series; one of the outer ring hollow blades in each blade unit is located inside the two circular hollow tubes, and the other Outer ring hollow paddles are located outside the two circular hollow tubes; all outer ring hollow paddles, all inner ring hollow paddles, all bends, two circular hollow tubes, all spokes and shafts are hollow structures, and each The hollow parts of the components communicate.

Each paddle unit includes a hollow paddle in the outer ring; the upper and lower ends of the hollow paddle in the outer ring are respectively connected to the upper and lower circular hollow tubes through elbows; the upper and lower circular hollow tubes respectively pass through each paddle The upper and lower end elbows of the blade units connect the upper and lower ends of each blade unit in series; all the outer ring hollow blades are located on the outside of the two circular hollow tubes; all the outer ring hollow blades, all the inner ring hollow blades , all elbows, two circular hollow pipes, all spokes and rotating shafts are hollow structures, and the hollow parts of each component communicate.

Among them, a plurality of blade units are divided into a plurality of blade units A and a plurality of blade units B; each blade unit A includes two outer ring hollow blades, two upper ends of the two outer ring hollow blades and The two lower ends are respectively connected by elbows; each blade unit B includes a hollow outer ring blade, and the upper and lower ends of each hollow outer ring blade are respectively connected with elbows; multiple blade units A and multiple Each paddle unit B is arranged alternately between the upper and lower circular hollow tubes; the upper and lower circular hollow tubes respectively pass through the upper and lower end elbows of each paddle unit to connect the upper and lower ends of each paddle unit together in series ; wherein, one outer ring hollow blade in each paddle unit A is located inside the two circular hollow tubes, and the other outer ring hollow blade is located outside the two circular hollow tubes; the outer ring of the paddle unit B is The ring hollow blades are all located outside the two circular hollow tubes; all outer ring hollow blades, all inner ring hollow blades, all elbows, two circular hollow tubes, all spokes and shafts are hollow structures, and each The hollow parts of the components communicate.

It is also characterized in that the section of the rotating shaft is a circular hollow tube with equal wall thickness.

It is further characterized in that the sections of the spokes, the two circular hollow tubes, the outer ring hollow paddle, the inner ring hollow paddle and the elbow are perfect circular hollow tubes or non-circular hollow tubes with equal wall thickness.

The beneficial effect of the present invention is,

1. The volume of the mixing container required by the stirring device of the present invention is less, and the volume of the mixing container determines the residence time of the material in the mixing container, so the time for the material to stay in the mixing container is shorter when stirring;

2. The device of the present invention does not have a coil structure that hinders fluid movement in the mixing container, so when the stirring paddle rotates, an ideal vortex can be formed for the melt in the container, and the ideal vortex is conducive to the powder material entering as quickly as possible. Inside the melt;

3. Since the mixing container of the present invention does not have a coil structure that hinders fluid movement, an ideal vortex can be formed without excessively high rotational speed of the stirring paddle, so the required motor power is lower;

4. The squirrel-cage stirring paddle composed of several hollow tubes is like a large-scale high-efficiency egg beater. When the paddle rotates, the structure is very conducive to the collision, tearing and kneading of the liquid and solid phase substances in the melt Wait for the mixing and stirring action, so the homogeneous mixing of the compound solution can be quickly completed;

5. At the same time, due to the temperature difference between the high-pressure steam and the material, this structure is very conducive to the contact heat exchange between the compound solution and the hollow stirring paddle, so it can quickly compensate for the temperature drop caused by the normal temperature powder material to the melt;

6. Since the composite solution contains a large amount of solid infusibles, especially a certain proportion of mineral powder and chloride in potassium salt, coupled with the high-speed movement of the fluid, the abrasion of the metal structure is inevitable, so the mixing and stirring device is combined with the mixing The container is made into two relatively independent devices, so it is easy to lift the mixing and stirring device together with the transmission mechanism out of the mixing container for cleaning, maintenance or even replacement.

Compared with the structure of the traditional mixing vessel with built-in steam coil, under the same conditions, the forced convection heat transfer coefficient is several to dozens of times larger than the natural convection heat transfer coefficient. In addition to the advantages of high heat transfer rate in heat exchange, the steam hollow paddle structure of the central stirring shaft of the present invention has the obvious characteristics of rapid and homogeneous mixing of melts.

Description of drawings

Fig. 1 is a structural schematic diagram of a mixing and stirring device of the present invention built in a mixing container and used in conjunction with a transmission mechanism and a two-way inner tube type rotary joint;

Fig. 2 is a structural representation of a transmission mechanism and a two-way inner tube type rotary joint used in conjunction with the stirring device of the present invention;

Fig. 3 is a schematic structural view of a mixing and stirring device in Example 1 of the present invention;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is the B-B view among Fig. 4;

Fig. 6 is the C-C view among Fig. 4;

7 is a perspective view of a mixing and stirring device in Example 1 of the present invention;

Figure 8 is a schematic structural view of a mixing and stirring device in Example 2 of the present invention;

Figure 9 is a top view of Figure 8;

Fig. 10 is a D-D view among Fig. 9;

11 is a schematic structural view of a mixing and stirring device in Example 3 of the present invention;

Figure 12 is a top view of Figure 11;

FIG. 13 is an E-E view of FIG. 12 .

In the figure, 1. Shaft, 2. Spokes, 3. Blade unit, 4. Circular hollow tube, 5. Hollow blade in inner ring, 6. Hollow blade in outer ring, 7. Elbow, 8. Flange A , 9. Mixing container, 10. Transmission mechanism, 11. Hollow main shaft, 12. Two-way inner tube rotary joint, 13. Flange B, 14. Steam inlet, 15. Steam through hole, 16. Between the outer tube and the inner tube 17. The inner cavity of the inner pipe, 18. The condensate outlet, 19. The condensate pipe, 20. The bottom material discharge valve.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in Figure 1, the present invention provides a mixing and stirring device with heating function, including a rotating shaft 1 and a stirring paddle; the upper end of the rotating shaft 1 is an open end, the lower end is a closed end, and the upper end of the rotating shaft 1 is also provided with a flange A8. The whole mixing and stirring device is arranged inside the mixing container 9, and the rotating shaft 1 is arranged in the center of the mixing container 9 in a vertical state. As shown in Fig. 3, 4 and Fig. 7, the stirring paddle is formed by a plurality of paddle units 3 connected in series: a plurality of paddle units 3 are located between two circular hollow tubes 4 arranged up and down. Shaped hollow tubes 4 have equal diameters and are horizontally arranged inside the mixing container 9; the rotating shaft 1 is located inside the two circular hollow tubes 4, and the central axis of the rotating shaft 1 and the two centers of the two circular hollow tubes 4 are located on the same vertical line superior. A plurality of blade units 3 are divided into a plurality of blade units A and a plurality of blade units B; as shown in Figure 6, each blade unit A includes two cylindrical outer ring hollow blades 6, two outer ring The two upper ends and two lower ends of the hollow paddle 6 are respectively connected by elbows 7; as shown in Figure 5, each paddle unit B includes a cylindrical outer ring hollow paddle 6, and the outer ring hollow paddle The upper and lower ends of 6 are respectively connected with elbows 7; as shown in Figures 3, 4 and 7, a plurality of blade units A and a plurality of blade units B are alternately arranged between the upper and lower circular hollow tubes 4. The upper circular hollow tube 4 passes through the elbow 7 at the upper end of each paddle unit 3 to connect the upper ends of each paddle unit 3 in series, and the lower circular hollow tube 4 passes through the lower end of each paddle unit 3 The elbow 7 connects the lower ends of the paddle units 3 together in series. Wherein, one outer ring hollow paddle 6 in each paddle unit A is positioned at the inside of two circular hollow tubes 4, and another outer ring hollow paddle 6 is positioned at the outside of two circular hollow tubes 4; each paddle The outer ring hollow paddles 6 of the blade unit B are located on the outside of the two circular hollow tubes 4 . Three horizontally arranged upper spokes 2 are evenly welded between the upper circular hollow tube 4 and the rotating shaft 1, and three horizontally arranged lower spokes 2 are evenly welded between the lower circular hollow tube 4 and the rotating shaft 1. Each pair of up and down corresponding spokes 2 is located on the same vertical plane and parallel to each other, and a cylindrical inner ring hollow paddle 5 is arranged between each pair of up and down corresponding spokes 2 . All the outer ring hollow paddles 6 and the inner ring hollow paddles 5 are arranged parallel to the rotating shaft 1 . All outer ring hollow paddles 6 , all inner ring hollow paddles 5 , all elbows 7 , two circular hollow tubes 4 , all spokes 2 and rotating shaft 1 are hollow structures, and the hollow parts of each component communicate.

Example 2

As shown in Figure 1, the present invention provides a mixing and stirring device with heating function, including a rotating shaft 1 and a stirring paddle; the upper end of the rotating shaft 1 is an open end, the lower end is a closed end, and the upper end of the rotating shaft 1 is also provided with a flange A8. The whole mixing and stirring device is arranged inside the mixing container 9, and the rotating shaft 1 is arranged in the center of the mixing container 9 in a vertical state. As shown in Figure 8 and Figure 9, the stirring paddle is formed by a plurality of paddle units 3 connected in series: a plurality of paddle units 3 are located between two circular hollow tubes 4 arranged up and down, and the two circular hollow tubes The tubes 4 have equal diameters and are arranged horizontally inside the mixing container 9; the rotating shaft 1 is located inside the two circular hollow tubes 4, and the central axis of the rotating shaft 1 is on the same vertical line as the two centers of the two circular hollow tubes 4. As shown in Figure 10, each paddle unit 3 includes two cylindrical outer ring hollow paddles 6, and the two upper ends and two lower ends of the two outer ring hollow paddles 6 are respectively connected by elbows 7; The upper circular hollow tube 4 passes through the elbow 7 at the upper end of each paddle unit 3 to connect the upper ends of each paddle unit 3 in series, and the lower circular hollow tube 4 passes through the lower end of each paddle unit 3 The elbow 7 connects the lower ends of the paddle units 3 together in series. Wherein, one outer ring hollow paddle 6 in each paddle unit 3 is located inside the two circular hollow tubes 4 , and the other outer ring hollow paddle 6 is located outside the two circular hollow tubes 4 . Three horizontally arranged upper spokes 2 are uniformly welded between the upper circular hollow tube 4 and the rotating shaft 1, and three horizontally arranged lower spokes 2 are evenly arranged between the lower circular hollow tube 4 and the rotating shaft 1. Each pair of up and down corresponding spokes 2 is located on the same vertical plane and parallel to each other, and a cylindrical inner ring hollow paddle 5 is arranged between each pair of up and down corresponding spokes 2 . All the outer ring hollow paddles 6 and the inner ring hollow paddles 5 are arranged parallel to the rotating shaft 1 . All outer ring hollow paddles 6 , all inner ring hollow paddles 5 , all elbows 7 , two circular hollow tubes 4 , all spokes 2 and rotating shaft 1 are hollow structures, and the hollow parts of each component communicate.

Example 3

As shown in Figure 1, the present invention provides a mixing and stirring device with heating function, including a rotating shaft 1 and a stirring paddle; the upper end of the rotating shaft 1 is an open end, the lower end is a closed end, and the upper end of the rotating shaft 1 is also provided with a flange A8. The whole mixing and stirring device is arranged inside the mixing container 9, and the rotating shaft 1 is arranged in the center of the mixing container 9 in a vertical state. As shown in Figures 11 and 12, the stirring paddle is formed by a plurality of paddle units 3 connected in series: a plurality of paddle units 3 are located between two circular hollow tubes 4 arranged up and down, and the two circular hollow tubes 4 have equal diameters and are horizontally arranged inside the mixing container 9; the rotating shaft 1 is located inside the two circular hollow tubes 4, and the central axis of the rotating shaft 1 and the two centers of the two circular hollow tubes 4 are located on the same vertical line. As shown in Figure 13, each paddle unit 3 only includes a cylindrical outer ring hollow paddle 6; the upper and lower ends of the outer ring hollow paddle 6 are respectively connected with elbows 7; The upper ends of each paddle unit 3 are connected in series through the elbow 7 at the upper end of each paddle unit 3 , and the circular hollow tube 4 located below passes through the elbow 7 at the lower end of each paddle unit 3 to connect each paddle unit 3 The lower ends are connected together. Wherein, all the outer hollow paddles 6 are located on the outer sides of the two circular hollow tubes 4 . Three horizontally arranged upper spokes 2 are evenly welded between the upper circular hollow tube 4 and the rotating shaft 1, and three horizontally arranged lower spokes 2 are evenly welded between the lower circular hollow tube 4 and the rotating shaft 1. Each pair of up and down corresponding spokes 2 is located on the same vertical plane and parallel to each other, and a cylindrical inner ring hollow paddle 5 is arranged between each pair of up and down corresponding spokes 2 . All the outer ring hollow paddles 6 and the inner ring hollow paddles 5 are arranged parallel to the rotating shaft 1 . All the outer ring hollow paddles 6, all the inner ring hollow paddles 5, the elbows 7, the two circular hollow tubes 4, all the spokes 2 and the rotating shaft 1 are hollow structures, and the hollow parts of each part communicate.

The hollow rotating shaft 1 of the mixing device of the present invention is a circular thick-walled tube with a cross section; the upper and lower tubular horizontal spokes 2, two circular hollow tubes 4, the outer ring hollow paddle 6, the inner ring hollow paddle 5 and the elbow The section of 7 is a perfect circle, ellipse or rectangle with equal wall thickness. The joints of the various components of the entire mixing and stirring device are welded together.

As shown in Figure 1, when in use, the stirring device of the present invention is built in the mixing container 9, and the rotating shaft 1 is arranged in the center of the mixing container 9 in a vertical state; The two-way inner tube type rotary joint 12 is used together. A transmission mechanism 10 is installed on the upper end of the rotating shaft 1 of the stirring device of the present invention, and the upper end of the hollow main shaft 11 of the transmission mechanism 10 is connected with a two-way inner tube type rotary joint 12 . The lower end of the hollow main shaft 11 of the transmission mechanism 10 is provided with a flange B13, which matches and fixes the flange A8 and the flange B13 together. The transmission device 10 drives the hollow main shaft 10 and the rotating shaft 1 of the stirring device of the present invention to rotate, and the rotation of the rotating shaft 1 drives the rotary motion of the entire stirring paddle through the spokes 2, so as to achieve the purpose of stirring the liquid-solid phase material to form a composite liquid slurry. The rotation direction of the outer ring hollow paddle 6 and the inner ring hollow paddle 5 makes a circular motion to form a concave vortex as shown in L in Figure 1, and the stirred composite slurry passes through the bottom material discharge valve arranged at the bottom of the mixing container 9 20 discharge. As shown in Figure 2, the outer tube of the two-way inner tube rotary joint 12 is provided with a steam inlet 14, and the inner tube is provided with a plurality of steam passage holes 15; the steam inlet 14, the cavity 16 between the outer tube and the inner tube , the steam through the hole 15 and the inner cavity 17 of the inner pipe communicate with each other; the condensed water outlet 18 on the two-way inner tube type rotary joint 12 communicates with the condensed water pipe 19; the inner cavity 17 of the inner tube, the hollow main shaft 11 of the transmission mechanism 10 and this The hollow rotating shaft 1 of the stirring device of the present invention communicates with each other; the condensed water pipe 19 passes through the inner cavity 17 of the inner pipe, the hollow main shaft 11 of the transmission mechanism 10 and the hollow rotating shaft 1 of the stirring device of the present invention, and extends to the bottom of the hollow rotating shaft 1.

When stirring, high-pressure steam is passed into the steam inlet 14 of the two-way inner tube rotary joint 12, and the steam enters the inner cavity 17 of the inner tube through the cavity 16 between the outer tube and the inner tube and the steam through the hole 15, and then enters the transmission In the hollow main shaft 11 of the mechanism 10 and the hollow rotating shaft 1 of the stirring device of the present invention, the steam continues to enter the spokes 2, the upper and lower circular hollow tubes 4, the elbow 7, the outer ring hollow paddle 6 and the inner ring hollow paddle 5, so that The entire rotating shaft 1 and the stirring paddle are filled with steam. During the stirring process, the temperature of the steam in the stirring paddle supplements the temperature drop caused by the normal temperature powder material to the melt. The steam in the stirring paddle exchanges heat with the material to form condensed water, and the condensed water is discharged from the condensed water outlet 18 of the two-way inner pipe rotary joint 12 through the condensed water pipe 19 .

The transmission mechanism 10 with the hollow shaft 11 structure and the two-way inner tube type rotary joint 12 are all existing mature technologies, and there are many kinds of products available for matching selection on the industrial product market.

The mixing and stirring device of the present invention can be used not only for liquid-solid phase mixing of chemical melts, but also for urea (or ammonium nitrate) melting of solid particles.

Claims (6)

1. mixed stirring device with heating function is characterized in that: comprise rotating shaft (1) and paddle, paddle is connected with rotating shaft (1) through spoke (2); Rotating shaft (1), spoke (2) and paddle all are hollow-core construction, and three's hollow parts communicates; The upper end of said rotating shaft (1) is an openend, and the lower end is a closing end; Said paddle is connected in series by a plurality of blades unit (3): a plurality of blades unit (3) is positioned between two circular hollow tubes set up and down (4); And the upper end of a plurality of blades unit (3) is chained together through the circular hollow tube (4) that is positioned at the top, and the lower end is chained together through the circular hollow tube (4) that is positioned at the below; Rotating shaft (1) is positioned at two circular hollow tubes (4) inboard, is respectively arranged with the upper and lower spoke (2) between two circular hollow tubes (4) and the rotating shaft (1); The upper and lower spoke (2) number equates, the every pair of corresponding up and down spoke (2) is positioned on the same vertical plane and is parallel to each other, and is provided with inner ring hollow blade (5) between every pair of corresponding up and down spoke (2).

2. mixed stirring device according to claim 1 is characterized in that: each blade unit (3) comprises two outer ring hollow blades (6); Connect through elbow (7) respectively between two upper ends of these two outer ring hollow blades (6) and two lower ends; Two circular hollow tubes (4) upper and lower side elbow (7) of passing each blade unit (3) respectively is chained together the upper and lower side of each blade unit (3) up and down; Wherein, the outer ring hollow blade (6) in each blade unit (3) is positioned at two circular hollow tubes (4) inboard, and another root outer ring hollow blade (6) is positioned at two circular hollow tubes (4) outside; All outer ring hollow blades (6), all inner ring hollow blades (5), all elbows (7), two circular hollow tubes (4), all spokes (2) and rotating shaft (1) all are hollow-core construction, and the hollow parts of each parts communicates.

3. mixed stirring device according to claim 1 is characterized in that: each blade unit (3) comprises an outer ring hollow blade (6); The upper and lower side of outer ring hollow blade (6) is connected with two circular hollow tubes (4) up and down through elbow (7) respectively; Two circular hollow tubes (4) upper and lower side elbow (7) of passing each blade unit (3) respectively is chained together the upper and lower side of each blade unit (3) up and down; All outer ring hollow blades (6) all are positioned at the outside of two circular hollow tubes (4); All outer ring hollow blades (6), all inner ring hollow blades (5), all elbows (7), two circular hollow tubes (4), all spokes (2) and rotating shaft (1) all are hollow-core construction, and the hollow parts of each parts communicates.

4. mixed stirring device according to claim 1 is characterized in that: said a plurality of blades unit (3) are divided into a plurality of blades unit A and a plurality of blade unit B;

Each blade unit A comprises two outer ring hollow blades (6), connects through elbow (7) respectively between two upper ends of two outer ring hollow blades (6) and two lower ends;

Each blade unit B comprises an outer ring hollow blade (6), and the upper and lower side of every outer ring hollow blade (6) is connected with elbow (7) respectively;

A plurality of blades unit A and a plurality of blade unit B are alternately setting and are positioned at up and down between two circular hollow tubes (4); Two circular hollow tubes (4) upper and lower side elbow (7) of passing each blade unit (3) respectively is chained together the upper and lower side of each blade unit (3) up and down; Wherein, the outer ring hollow blade (6) among each blade unit A is positioned at two circular hollow tubes (4) inboard, and another root outer ring hollow blade (6) is positioned at two circular hollow tubes (4) outside; The outer ring hollow blade (6) of blade unit B all is positioned at two circular hollow tubes (4) outside; All outer ring hollow blades (6), all inner ring hollow blades (5), all elbows (7), two circular hollow tubes (4), all spokes (2) and rotating shaft (1) all are hollow-core construction, and the hollow parts of each parts communicates.

5. according to the described mixed stirring device of any one claim in the claim 1 ~ 4, it is characterized in that: the cross section of said rotating shaft (1) is the positive circular hollow tube that waits wall thickness.

6. according to the described mixed stirring device of any one claim in the claim 2 ~ 4, it is characterized in that: the cross section of spoke (2), two circular hollow tubes (4), outer ring hollow blade (6), inner ring hollow blade (5) and elbow (7) for etc. the positive circular hollow tube or the non-positive circular hollow tube of wall thickness.

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