High-shear stirrer and stirring method thereof

Abstract

The invention provides a high-shear stirrer, and relates to the field of stirrers, the high-shear stirrer comprises a stirring tank and a fixing frame, a motor is arranged above a shell, a transmission structure is arranged in the shell, a first shaft body and a second shaft body which are concentric are arranged below the shell, turbine blades are arranged on the periphery of the first shaft body, and a shear structure is arranged on the periphery of the second shaft body. The invention further discloses a high-shear stirring method of the stirrer, the first shaft body and the second shaft body form a concentric double-shaft reverse shear stirring structure through the transmission structure, the first shaft body rotating at a low speed is matched with the turbine blades to gather materials, and the second shaft body rotating at a high speed is matched with the shear disc to shear the gathered materials. And a high shear stress field is formed in a shearing disc area by matching with a shearing basket which reversely rotates on the periphery of the shearing disc, so that the shearing effect on the materials is further improved, and turbulent flow or cavitation effect is formed while additional shearing force is generated by matching with the materials jetted and guided back by jet flow holes, so that particles are further refined, and dead angles are reduced.

Description

Technical Field

[0001] The present invention relates to the field of mixers, and particularly to a high-shear mixer and its mixing method. Background Art

[0002] A mixer is a machine with a shaft equipped with blades rotating in a cylinder or trough to mix a variety of raw materials into a mixture or a substance with an appropriate consistency. There are many types of mixers, including high-shear mixers. A high-shear mixer is an industrial device that generates a strong shear force field through high-speed rotating components to achieve efficient mixing, dispersion, or homogenization of materials. Its core principle is to utilize mechanical shear, cavitation effects, and turbulence to refine material particles or droplets to the micron or even nanometer level, and it is suitable for complex systems with high viscosity and difficult to mix. Most existing high-shear mixers only have a single stirring paddle, and the shear effect is improved by changing the different shapes or specifications of the paddle. However, in the actual use process, a single co-rotating stirring structure cannot increase the shear gradient field and shear stress, so the shear effect cannot be further improved. Therefore, we propose a high-shear mixer with a concentric double-shaft stirring structure. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-shear mixer with a concentric double-shaft stirring structure and its mixing method to solve the problems raised in the above background art.

[0004] To solve the problems existing in the prior art, the present invention provides a high-shear mixer, which includes a mixing tank and a fixing frame. Above the fixing frame is provided a housing, above the housing is provided a motor, inside the housing is provided a transmission structure, below the housing are provided concentric first shaft and second shaft, around the first shaft is provided a turbine blade, and around the second shaft is provided a shear structure.

[0005] Further, the transmission structure includes a first gear disc and a second gear disc. The first gear disc is fixedly arranged around the second shaft, the second gear disc is fixedly arranged around the first shaft, and the first gear disc and the second gear disc are arranged opposite to each other with a certain distance therebetween.

[0006] Further, the transmission structure further includes gears. The gears are divided into two groups and are respectively arranged on the left and right sides between the first gear disc and the second gear disc, and the gears are meshed with the first gear disc and the second gear disc.

[0007] Further, the upper part of the second shaft is connected to the output end of the motor through a rotary joint, and the upper part of the first shaft is connected to the second gear disc.

[0008] Furthermore, both the first shaft body and the second shaft body are designed to be hollow. The diameter of the first shaft body is larger than that of the second shaft body, and the first shaft body is sleeved around the second shaft body.

[0009] Furthermore, the shearing structure includes a shearing disc and a shearing basket. The shearing disc is fixedly arranged below the second shaft body, and the shearing basket is sleeved around the shearing disc.

[0010] Furthermore, the shearing basket is connected to the first shaft body through a connecting frame. During use, the rotation direction of the shearing basket is opposite to that of the shearing disc.

[0011] Furthermore, the inside of the shearing basket is hollow, and several serrated through holes are provided on the basket body of the shearing basket.

[0012] Furthermore, the rotary joint is connected to an external high-pressure pump through a delivery pipe. The output end of the delivery pipe extends to the inside of the second shaft body. Several jet holes are provided on the periphery of the second shaft body, and the input end of the jet hole is connected to the output end of the delivery pipe.

[0013] A high-shear mixer and its mixing method include the following steps: S1. Add the materials and liquid to be mixed into the mixing tank. After debugging each component, prepare for the mixing work. S2. After starting the motor, drive the transmission structure inside the housing through the motor, thereby driving the first shaft body and the second shaft body to rotate respectively. Drive the turbine impeller and the shearing basket to rotate through the rotating first shaft body, and drive the shearing disc to rotate through the rotation of the second shaft body, so as to perform the shearing and mixing work on the materials. S3. Through the design of the transmission structure, the first shaft body and the second shaft body rotate in opposite directions, so that the rotation directions of the turbine impeller and the shearing basket are opposite to that of the shearing disc, forming a shearing gradient field, thereby increasing the shearing and mixing effect. S4. After mixing is completed, open the valve obliquely below the mixing tank, and the materials in the mixing tank are exported through the discharge pipe to complete the mixing work.

[0014] Compared with the prior art, the beneficial effects of the present invention are: In the present invention, through the design of the transmission structure, the first shaft body and the second shaft body form a concentric double-shaft reverse shear stirring structure. The first shaft body rotating at a low speed cooperates with the turbine blades to gather the materials, and the second shaft body rotating at a high speed cooperates with the shear disc to shear the gathered materials. Then, with the shear basket rotating in the opposite direction outside the shear disc, a high shear stress field is formed in the shear disc area, further increasing the shearing effect on the materials. Through the arrangement of the jet holes and the external high-pressure pump, the shredded materials in the tank can be re-injected back into the shear area for secondary shearing, forming a turbulent flow or cavitation effect while generating additional shear force, further refining the particles. In addition, the circulating jet can also promote the circulation of the overall flow field, reduce dead corners, and improve the mixing uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a top view of the present invention; Figure 3 is a schematic diagram of the internal structure of the present invention; Figure 4 is a partial schematic diagram of the shear structure of the present invention; Figure 5 is a partial schematic diagram of the transmission structure of the present invention.

[0016] Reference numerals: 1, stirring tank; 2, fixing frame; 3, motor; 4, housing; 5, first shaft body; 6, turbine blade; 7, shear disc; 8, jet hole; 9, conveying pipe; 10, shear basket; 11, connecting frame; 12, second shaft body; 13, rotary joint; 14, gear; 15, first tooth disc; 16, second tooth disc. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments and drawings. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present invention.

[0018] The specific embodiments of the present invention will be described below in conjunction with the drawings.

[0019] Embodiment 1 As Figures 1-5 shown, a high-shear mixer includes a stirring tank 1 and a fixing frame 2. A housing 4 is provided above the fixing frame 2, a motor 3 is provided above the housing 4, a transmission structure is provided inside the housing 4, a concentric first shaft body 5 and a second shaft body 12 are provided below the housing 4, turbine blades 6 are provided on the periphery of the first shaft body 5, and a shear structure is provided on the periphery of the second shaft body 12; Add the materials and liquid to be stirred into the stirring tank 1. After debugging each component, prepare for the stirring work. After starting the motor 3, drive the transmission structure in the housing 4 through the motor 3 to drive the first shaft body 5 and the second shaft body 12 to rotate respectively. Drive the turbine blade 6 and the shear basket 10 to rotate through the rotating first shaft body 5, and drive the shear disc 7 to rotate through the rotation of the second shaft body 12, so as to shear and stir the materials.

[0020] During the stirring process, in order to improve the cohesion of the materials for shearing, as shown in the attached Figures 2-5 figure, a concentric first shaft body 5 and a second shaft body 12 are provided below the housing 4, and a turbine blade 6 is provided on the periphery of the first shaft body 5; When the first shaft body 5 rotates, it drives the turbine blade 6 to rotate. Through the rotating turbine blade 6, a vortex can be formed, which has an aggregating effect on the materials in the stirring tank 1. The aggregated materials are convenient for subsequent shearing and stirring work.

[0021] In order to increase the shearing and stirring effect, as shown in the attached Figures 2-5 figure, the transmission structure includes a first tooth disc 15 and a second tooth disc 16. The first tooth disc 15 is fixedly arranged on the periphery of the second shaft body 12, and the second tooth disc 16 is fixedly arranged on the periphery of the first shaft body 5. The first tooth disc 15 and the second tooth disc 16 are arranged opposite to each other with a certain distance. The transmission structure also includes a gear 14, which is divided into two groups and is respectively arranged on the left and right sides between the first tooth disc 15 and the second tooth disc 16. The gear 14 meshes with the first tooth disc 15 and the second tooth disc 16. The upper part of the second shaft body 12 is connected to the output end of the motor 3 through a rotary joint 13, and the upper part of the first shaft body 5 is connected to the second tooth disc 16. Both the first shaft body 5 and the second shaft body 12 are of hollow design, and the diameter of the first shaft body 5 is larger than that of the second shaft body 12. The first shaft body 5 is sleeved on the periphery of the second shaft body 12; When the motor 3 drives the second shaft body 12 to rotate at a high speed, it synchronously drives the first tooth disc 15 to rotate. Through the rotation of the first tooth disc 15, it drives the two groups of gears 14 to rotate. Through the rotating gears 14, it drives the lower second tooth disc 16 to rotate in the opposite direction. Through the reversely rotating second tooth disc 16, it drives the first shaft body 5 to rotate slowly in the opposite direction, so that the slowly rotating turbine blade 6 and the high-speed rotating shear disc 7 rotate in opposite directions, forming a shear gradient field. And when the rotating turbine blade 6 aggregates the materials, a shear stress field is formed through the reversely rotating shear disc 7, shearing and tearing the material aggregates, thereby increasing the shearing effect.

[0022] In order to further increase the shearing effect, as shown in the attached Figures 3-4As shown in the figure, the shearing structure includes a shearing disc 7 and a shearing basket 10. The shearing disc 7 is fixedly arranged below the second shaft body 12. The shearing basket 10 is sleeved on the periphery of the shearing disc 7. The shearing basket 10 is connected to the first shaft body 5 through a connecting frame 11. During use, the rotation direction of the shearing basket 10 is opposite to that of the shearing disc 7. The inside of the shearing basket 10 is hollow, and a number of serrated through holes are provided on the basket body of the shearing basket 10. The shearing basket 10 connected to the first shaft body 5 through the connecting frame 11 enables the first shaft body 5 to drive the shearing basket 10 to rotate synchronously during rotation. Since the rotation directions of the first shaft body 5 and the second shaft body 12 are opposite, the rotation directions of the shearing basket 10 and the shearing disc 7 are also opposite. Therefore, during the shearing and stirring process of the shearing disc 7, a shearing stress field is also formed by the reversely rotating shearing basket 10, further shearing the materials thrown out by the shearing disc 7. And through the design of a number of serrated through holes on the shearing basket 10, the materials thrown out by shearing are sheared again when passing through the serrated through holes, thereby further increasing the shearing effect of the device.

[0023] In order to increase the shearing accuracy and comprehensiveness and avoid situations such as missed shearing, the second shaft body 12 is designed to be hollow. The upper part of the second shaft body 12 is connected to the output end of the motor 3 through a rotary joint 13. The rotary joint 13 is connected to an external high-pressure pump through a delivery pipe 9. The output end of the delivery pipe 9 extends into the interior of the second shaft body 12. A number of jet holes 8 are provided on the periphery of the second shaft body 12 below the first shaft body 5. The input end of the jet holes 8 is connected to the output end of the delivery pipe 9. The second shaft body 12 is designed to be hollow as a conveying channel for high-pressure fluid. Since the second shaft body 12 needs to rotate while the high-pressure pump is fixed, a rotary joint 13 is required to achieve the connection between the two. After the rotary joint 13 is connected to the external high-pressure pump through the delivery pipe 9, the output end of the delivery pipe 9 extends into the interior of the second shaft body 12. First, after the high-pressure pump is started, the sheared materials in the mixing tank 1 are pumped out and re-transported back into the second shaft body 12 through the delivery pipe 9 and sprayed out under high pressure through a number of jet holes 8. The materials sprayed out under high pressure through a number of jet holes 8 form a circulating jet flow by themselves in the shearing area, increasing the residence time of the materials in the high-shearing area, thereby improving the dispersion and homogenization effects. Secondly, the jet flow itself may generate additional shearing force, especially when spraying at high speed, forming a turbulent flow or cavitation effect, further refining the particles. In addition, the circulating jet flow can also promote the circulation of the overall flow field, reduce dead corners, and improve the mixing uniformity.

[0024] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A high-shear mixer, comprising a mixing tank (1) and a fixing frame (2), characterized in that: Above the fixing frame (2) is provided with a housing (4), above the housing (4) is provided with a motor (3), inside the housing (4) is provided with a transmission structure, below the housing (4) are provided concentric first shaft body (5) and second shaft body (12), around the first shaft body (5) is provided with a turbine blade (6), and around the second shaft body (12) is provided with a shearing structure.

2. The high-shear mixer according to claim 1, wherein: The transmission structure includes a first gear disk (15) and a second gear disk (16). The first gear disk (15) is fixed around the second shaft body (12), the second gear disk (16) is fixed around the first shaft body (5), the first gear disk (15) and the second gear disk (16) are arranged opposite to each other with a certain distance therebetween.

3. The high-shear mixer according to claim 2, characterized in that: The transmission structure further includes gears (14). The gears (14) are divided into two groups and are respectively arranged on the left side and the right side between the first gear disk (15) and the second gear disk (16). The gears (14) are meshed with the first gear disk (15) and the second gear disk (16).

4. The high-shear mixer according to claim 3, wherein: The upper part of the second shaft body (12) is connected to the output end of the motor (3) through a rotary joint (13), and the upper part of the first shaft body (5) is connected to the second gear disk (16).

5. A high-shear mixer according to claim 4, characterized in that: Both the first shaft body (5) and the second shaft body (12) are of hollow design. The diameter of the first shaft body (5) is larger than the diameter of the second shaft body (12), and the first shaft body (5) is sleeved around the second shaft body (12).

6. The high-shear mixer according to claim 5, characterized in that: The shearing structure includes a shearing disk (7) and a shearing basket (10). The shearing disk (7) is fixed below the second shaft body (12), and the shearing basket (10) is sleeved around the shearing disk (7).

7. A high-shear mixer according to claim 6, characterized in that: The shearing basket (10) is connected to the first shaft body (5) through a connecting frame (11). During use, the rotating direction of the shearing basket (10) is opposite to the rotating direction of the shearing disk (7).

8. A high-shear mixer according to claim 7, characterized in that: The inside of the shearing basket (10) is hollow, and there are a number of serrated through holes on the basket body of the shearing basket (10).

9. A high-shear mixer according to claim 8, characterized in that: The rotary joint (13) is connected to an external high-pressure pump through a delivery pipe (9). The output end of the delivery pipe (9) extends into the second shaft body (12). A number of jet holes (8) are provided around the second shaft body (12), and the input end of the jet holes (8) is connected to the output end of the delivery pipe (9).

10. The stirring method of a high-shear mixer according to claim 9, characterized in that, Including the following steps: S1. Add materials and liquid to be stirred and the like into the stirring tank (1). After debugging each component, prepare for the stirring work. S2. After starting the motor 3, drive the transmission structure inside the housing (4) through the motor 3 to drive the first shaft body (5) and the second shaft body (12) to rotate respectively. Drive the turbine blade (6) and the shearing basket (10) to rotate through the rotating first shaft body (5), and drive the shearing disk (7) to rotate through the rotation of the second shaft body (12), so as to perform the shearing and stirring work on the materials. S3. Through the design of the transmission structure, the first shaft body (5) and the second shaft body (12) rotate in opposite directions, so that the rotation directions of the turbine blades (6) and the shear basket (10) are opposite to the rotation direction of the shear disc (7), forming a shear gradient field, thereby increasing the effect of shear stirring; S4. After the stirring is completed, open the valve obliquely below the stirring tank 1, and the materials in the stirring tank 1 are discharged through the feeding pipe to complete the stirring work.

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