High shear machine with cavitation effect

Abstract

The application relates to a high-shear machine with cavitation effect, and relates to a high-shear machine. The high-shear machine is used to solve the technical problem that the existing high-shear machine has poor homogenization effect on solid-liquid fluid with particle size below 50 microns. The high-shear machine is composed of a front disc, an impeller, an intermediate ring, a rear disc and a motor. The front disc is a disc structure with a cylindrical cavity in the middle and is provided with shear teeth. The impeller is provided with shear teeth on both sides and is provided with flow guide holes in the middle. The rear disc is a disc structure with a cylindrical cavity and is provided with shear teeth. The intermediate ring is clamped between the front disc and the rear disc, and the front disc, the intermediate ring and the rear disc are connected with the motor shell as a whole. The transmission shaft of the motor is fixedly connected with the impeller as a whole. Multiple rectangular tubular flow channels are formed in the front and rear cavities of the impeller. When the fluid moves at high speed in the rectangular tubular flow channels, cavitation effect is generated, and the emulsification effect is improved through cavitation and shearing. The high-shear machine can be used in the fields of biological and chemical products such as dairy products, beverages, medicines, coal water slurry and coatings.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of high shear machine. BACKGROUND

[0002] High shear machine is widely used in fluid mixing, chemical catalysis and other fields, and the existing high shear machine utilizes the shear, cavitation and mechanical impact effect generated by the relative motion of rotor and stator at high speed to achieve the effect of crushing and emulsification. However, the shear effect generated by the shear teeth is the main action, and the cavitation effect is weak. If such a high shear machine is used in the field of solid-liquid fluid homogenization mixing, the large particles can be broken to about 100 microns by using shear teeth, but for solid-liquid fluid homogenization mixing with particle size below 50 microns, the solid particles are not broken obviously, and the homogenization effect is poor. SUMMARY

[0003] The present application is to solve the technical problem of poor homogenization effect of the existing high shear machine for solid-liquid fluid with particle size below 50 microns, and to provide a high shear machine with cavitation effect.

[0004] The high shear machine with cavitation effect of the present application is composed of a front disc 1, an impeller 2, an intermediate ring 3, a rear disc 4 and a motor 5.

[0005] The front disc 1 is a disc structure with a cylindrical cavity in the middle, a liquid inlet 1-1 is provided at the end of the cylindrical cavity, and a protruding square first shear tooth 1-2 is provided at the outer circumferential area of the disc; the first shear tooth 1-2 is concentric with the disc and arranged in a circumferential arrangement.

[0006] The impeller 2 is a flat disc structure, a protruding square second shear tooth 2-1 is provided at the outer circumferential area of the left side surface of the disc, and a protruding square third shear tooth 2-2 is provided at the outer circumferential area of the right side surface of the disc; the second shear tooth 2-1 and the third shear tooth 2-2 are concentric with the disc and arranged in a circumferential arrangement; a flow guide hole 2-3 is provided in the middle area surrounded by the shear tooth area, and a mounting hole 2-4 is provided at the center of the disc;

[0007] The rear disc 4 is a disc structure with a cylindrical cavity, a protruding square fourth shear tooth 4-1 is provided at the outer circumferential area of the disc; the fourth shear tooth 4-1 is concentric with the disc and arranged in a circumferential arrangement; a through hole 4-2 is provided at the axis of the cylindrical cavity;

[0008] The intermediate ring 3 is provided with a liquid outlet 3-1;

[0009] The transmission shaft 5-2 of the motor 5 is fixedly connected with the impeller 2 through the through hole 4-2 of the rear disc 4 as a whole;

[0010] The intermediate ring 3 is clamped between the front disc 1 and the rear disc 4, and the front disc 1, the intermediate ring 3 and the rear disc 4 are fixedly connected with the shell 5-1 of the motor 5 as a whole; the first shear tooth 1-2 of the front disc 1 is matched with the second shear tooth 2-1 of the impeller 2, and the gap in the radial direction between the first shear tooth 1-2 and the second shear tooth 2-1 is 0.1mm-5mm; the third shear tooth 2-2 of the impeller 2 is matched with the fourth shear tooth 4-1 of the rear disc 4, and the gap in the radial direction between the third shear tooth 2-2 and the fourth shear tooth 4-1 is 0.1mm-5mm.

[0011] Further, the number of the flow guide holes 2-3 of the impeller 2 is 3-6, and the flow guide holes 2-3 are evenly distributed around the axis of the impeller 2.

[0012] Further, the axis of the flow guide hole 2-3 of the impeller 2 forms an angle of 60° with the axis of the impeller, and the axis of the flow guide hole 2-3 of the impeller 2 forms an angle of 30° with the disc surface of the impeller.

[0013] The cavity in front of the front disc 1 and the impeller 2 is the front cavity, and the cavity between the rear side of the impeller 2 and the rear disc 4 is the rear cavity, and the setting of the flow guide hole makes the slurry entering the front cavity quickly flow to the rear cavity, thereby playing a fluid guiding role.

[0014] Further, the length of the second shear tooth 2-1 on the impeller 2 is less than the length of the first shear tooth 1-2 of the front disc 1. The length of the third shear tooth 2-2 on the impeller 2 is less than the length of the fourth shear tooth 4-1 of the rear disc 4. This setting is conducive to increasing the grinding path and grinding time of the particles in the slurry from the inlet to the outlet, and is conducive to improving the emulsification efficiency.

[0015] Further, the number of turns of the first shear tooth 1-2 is 3-5 turns;

[0016] Further, the number of turns of the second shear tooth 2-1 of the impeller 2 is 3-5 turns;

[0017] Further, the number of turns of the third shear tooth 2-2 of the impeller 2 is 3-5 turns;

[0018] Further, the number of turns of the fourth shear tooth 4-1 of the rear disc 4 is 3-5 turns;

[0019] The more the number of turns of the shear tooth is, the better the cavitation shearing effect is, which is conducive to improving the emulsification effect.

[0020] The working process of the high shear machine with cavitation effect of the application is as follows: the mixed fluid to be treated flows into the front cavity between the front disc 1 and the impeller 2 through the liquid inlet 1-1, under the centrifugal action generated by the high-speed rotation of the impeller 2 driven by the motor 5, part of the mixed fluid is guided into the rear cavity between the rear side of the impeller 2 and the rear disc 4 through the flow guide hole 2-3 of the impeller 2, and the mixed fluid flows outward through the gap formed by the square shear teeth of the front disc 1, the impeller 2 and the rear disc 4 under the action of the centrifugal force, and then flows out through the liquid outlet 3-1 on the middle ring 3.

[0021] The working principle of the high shear machine with cavitation effect of the application is as follows: a plurality of square annular pipe cavities are formed between the front disc 1, the impeller 2 and the rear disc 4 in the high shear machine, when the linear velocity of the square tooth structure of the impeller exceeds 27 m / s under the high-speed rotation of the impeller, the rear end face of the square tooth structure on the impeller will generate a hydraulic cavitation phenomenon when each protrusion passes through the square annular pipe cavity, that is, a gas region is formed, a hydraulic cavitation effect is generated at the gas-liquid interface, and a local high-temperature, high-pressure shock wave and a high-speed water jet are generated, wherein the temperature of the micro-point region can reach more than 3000K, the pressure of the micro-point region can reach more than 100MPa, and the speed of the micro-point water jet can reach more than 100m / s. When the mixed fluid flows through the gap formed by the impeller 2, the front disc 1 and the rear disc 4, a plurality of rectangular tubular flow channels are formed between the disc surface of the impeller 2, the disc surface of the front disc 1, the disc surface of the rear disc 2 and the first shear tooth 1-2 and the fourth shear tooth 4-1, and the second shear tooth 2-1 and the third shear tooth 2-2 on the impeller move at high speed in the rectangular tubular flow channels. At this time, a cavitation zone will be formed at the rear end of the shear tooth on the impeller, and the mixed fluid will undergo a series of changes such as collision, fragmentation and chemical reaction under the action of high temperature, high pressure shock wave, high speed water jet and shear effect, thereby realizing the functions of homogenization and emulsification of the mixed fluid.

[0022] The high shear machine with cavitation effect of the application can be used for mixing, homogenization and emulsification of various liquids, and can also be used for mixing, homogenization and emulsification of slurry containing solid particles. For example, liquid sterilization, rapid homogenization, emulsification and formation of stable mixed fluid. Due to the existence of hydraulic cavitation effect, the performance of the high shear machine with cavitation effect of the application is better than that of the existing high shear machine or mixer in terms of homogenization and emulsification effect, and the mixed fluid formed is more stable, has lower viscosity and better flowability.

[0023] The high shear machine with cavitation effect of the application has a unique structure design, and cavitation effect will occur in the gap between the impeller and the front and rear discs, the cavitation effect area is increased, the cavitation effect and high shear effect are combined together, the emulsification effect is improved, and when the particle size of the liquid phase homogenization mixture is less than 50 microns, the solid particles are further broken to about 5 microns, the homogenization and mixing effect is greatly improved, the stability of the mixed fluid is also improved, and the mixed fluid is less likely to precipitate.

[0024] The high shear machine with cavitation effect can be used in biological and chemical fields such as dairy products, beverages, pharmaceuticals, coal water slurry, coatings and the like. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic view of the high shear machine with cavitation effect of the present application;

[0026] Figure 2 It is an A-A sectional view of Figure 1

[0027] Figure 3 It is a three-dimensional structural schematic view of the impeller 2;

[0028] Figure 4 It is a three-dimensional structural schematic view of the rear disc 4;

[0029] Figure 5 It is a three-dimensional structural schematic view of the front disc 1;

[0030] Figure 6 It is a three-dimensional structural schematic view of the intermediate ring 3. DETAILED DESCRIPTION

[0031] The beneficial effects of the present application are verified by the following examples.

[0032] Example 1: The high shear machine with cavitation effect of the present example is composed of a front disc 1, an impeller 2, an intermediate ring 3, a rear disc 4 and a motor 5;

[0033] The front disc 1 is a disc structure with a cylindrical cavity in the middle, a liquid inlet 1-1 is arranged at the end of the cylindrical cavity, and three circles of protruding square first shear teeth 1-2 are arranged at the outer circumferential area of the disc; the first shear teeth 1-2 are concentric with the disc and arranged in a circumferential manner;

[0034] The impeller 2 is a planar disc structure, three circles of protruding square second shear teeth 2-1 are arranged at the outer circumferential area of the left side surface of the disc, three circles of protruding square third shear teeth 2-2 are arranged at the outer circumferential area of the right side surface of the disc, the second shear teeth 2-1 and the third shear teeth 2-2 are concentric with the disc and arranged in a circumferential manner; four flow guide holes 2-3 are uniformly distributed in the middle area surrounded by the shear teeth area with the axis of the impeller 2 as the center, the axes of the flow guide holes 2-3 form an angle of 60° with the axis of the impeller, the axes of the four flow guide holes 2-3 form an angle of 60° with the axis of the impeller, and the axes of the flow guide holes 2-3 of the impeller 2 form an angle of 30° with the disc surface of the impeller; a mounting hole 2-4 is arranged at the center position of the disc;

[0035] ​The rear disc 4 is a disc structure with a cylindrical cavity, and three rows of convex square fourth shearing teeth 4-1 are arranged on the outer circumferential area of the disc. The fourth shearing teeth 4-1 are concentric with the disc and arranged in a circumferential direction. A through hole 4-2 is arranged at the axial position of the cylindrical cavity.

[0036] The intermediate ring 3 is provided with an outlet 3-1.

[0037] The transmission shaft 5-2 of the motor 5 is fixedly connected with the impeller 2 through the through hole 4-2 of the rear disc 4.

[0038] The intermediate ring 3 is clamped between the front disc 1 and the rear disc 4, and the front disc 1, the intermediate ring 3 and the rear disc 4 are fixedly connected with the shell 5-1 of the motor 5. The first shearing teeth 1-2 of the front disc 1 are matched with the second shearing teeth 2-1 of the impeller 2, and the gap between the first shearing teeth 1-2 and the second shearing teeth 2-1 in the radial direction is 0.8 mm. The third shearing teeth 2-2 of the impeller 2 are matched with the fourth shearing teeth 4-1 of the rear disc 4, and the gap between the third shearing teeth 2-2 and the fourth shearing teeth 4-1 in the radial direction is 0.8 mm. The length of the second shearing teeth 2-1 on the impeller 2 is less than the length of the first shearing teeth 1-2 of the front disc 1. The length of the third shearing teeth 2-2 on the impeller 2 is less than the length of the fourth shearing teeth 4-1 of the rear disc 4.

[0039] The high-shear machine with cavitation effect of Example 1 is used to process beverages, and the fluid is homogenously emulsified by shearing. Under the cavitation effect, the temperature of the fluid is increased, and under the combined action of the temperature and the cavitation effect, the sterilization effect can be achieved. When the fluid temperature is increased to 60℃, the killing effect of Escherichia coli in the fluid is more than 99%. It can also be used to process liquid-liquid fluids such as homogenously mixed liquids in the dairy industry and the chemical industry.

[0040] The high-shear machine with cavitation effect of Example 1 is used to process water coal slurry, and the particle size of the solid particles in the water coal slurry is about 50 microns. The fluid is homogenously emulsified by shearing, and under the cavitation effect, the fluid particles are further broken. After processing, the particle size of the solid particles in the water coal slurry is broken to about 5 microns. Due to the action of the cavitation effect, the chemical properties of the surface of the solid particles and the fluid are changed, the homogenously mixed effect is greatly improved, and the stability of the mixed fluid is increased. It can also be used to process solid-liquid fluids in the pharmaceutical and coating fields.

Claims

1. A high-shear machine with cavitation effect, characterized in that... The high-shear machine consists of a front disc (1), an impeller (2), an intermediate ring (3), a rear disc (4), and a motor (5); The front disc (1) is a disc structure with a cylindrical cavity in the middle. An inlet (1-1) is provided at the end of the cylindrical cavity, and a raised square first shearing tooth (1-2) is provided in the outer circumferential area of ​​the disc. The first shearing tooth (1-2) is concentric with the disc and arranged in a circular pattern. The impeller (2) is a planar disc structure. A raised square second shear tooth (2-1) is provided on the outer circumferential area of ​​the left side surface of the disc, and a raised square third shear tooth (2-2) is provided on the outer circumferential area of ​​the right side surface of the disc. The second shear tooth (2-1) and the third shear tooth (2-2) are concentric with the disc and arranged in a circular pattern. A guide hole (2-3) is provided in the central area enclosed by the shear tooth area. There are 3 to 6 guide holes (2-3), which are evenly distributed around the axis of the impeller (2). The axis of the guide hole (2-3) forms a 60° angle with the axis of the impeller, and the axis of the guide hole (2-3) forms a 30° angle with the disc surface of the impeller. A mounting hole (2-4) is provided at the center of the disc. The rear plate (4) is a disc structure with a cylindrical cavity. A raised square fourth shear tooth (4-1) is provided in the outer circumferential area of ​​the disc. The fourth shear tooth (4-1) is concentric with the disc and arranged in a circular pattern. A through hole (4-2) is provided at the axial position of the cylindrical cavity. An outlet (3-1) is provided on the intermediate ring (3); The drive shaft 5-2 of the motor (5) is fixedly connected to the impeller (2) through the through hole (4-2) of the rear disc (4); The intermediate ring (3) is sandwiched between the front disc (1) and the rear disc (4), and the front disc (1), the intermediate ring (3) and the rear disc (4) are fixedly connected to the housing 5-1 of the motor (5) as a whole; the first shearing tooth (1-2) of the front disc (1) is engaged with the second shearing tooth (2-1) of the impeller (2), and the radial gap between the first shearing tooth (1-2) and the second shearing tooth (2-1) is 0.1mm~5mm; the tooth length of the second shearing tooth (2-1) on the impeller (2) is less than the length of the first shearing tooth (1-2) of the front disc (1); the third shearing tooth (2-2) of the impeller (2) is engaged with the fourth shearing tooth (4-1) of the rear disc (4), and the radial gap between the third shearing tooth (2-2) and the fourth shearing tooth (4-1) is 0.1mm~5mm; the tooth length of the third shearing tooth (2-2) on the impeller (2) is less than the tooth length of the fourth shearing tooth (4-1) of the rear disc (4).

2. A high-shear machine with cavitation effect according to claim 1, characterized in that... The first shearing tooth (1-2) has 3 to 5 turns.

3. A high-shear machine with cavitation effect according to claim 1, characterized in that... The second shearing tooth (2-1) of the impeller (2) has 3 to 5 turns.

4. A high-shear machine with cavitation effect according to claim 1, characterized in that... The third shear tooth (2-2) of the impeller (2) has 3 to 5 turns.

5. A high-shear mill with cavitation effect according to claim 1, characterized in that... The fourth shear tooth (4-1) of the rear plate (4) has 3 to 5 turns.

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