A new vertical sand mill

Abstract

The utility model relates to a novel vertical sand mill, its rotor subassembly is by stirring dispersion subassembly, closed impeller and open impeller is composed, the blade inclination angle of closed impeller is less than open impeller, and closed impeller makes heavy phase grinding medium and light phase slurry separate by centrifugal force and reaction force of rotation, and open impeller makes grinding medium unable to flow out grinding cavity by centrifugal force and reaction force of rotation of rotation, the gravity settling chamber is connected with the impeller center, when fluid flows from below to top, the cross section gradually becomes big, and the flow velocity slows down, and a small amount of medium that overflows together with slurry is separated after filtering screen and is deposited to the bottom of the taper mouth and reflows into the grinding cavity through the impeller under the influence of gravity. The case replaces physical filter screen filtration with centrifugal force, solves the problem that the filter screen is blocked, and the grinding medium accumulated in the settling chamber can automatically flow back to the grinding cavity, guarantees the consistency of grinding quality, reduces manual processing time, and the grinding medium and slurry are completely separated, and the medium will not leak outside the device.

Description

Technical Field

[0001] This utility model relates to a wet grinding equipment, which is mainly used in the wet grinding preparation process of nanomaterials, and in particular to a novel vertical sand mill. Background Technology

[0002] In the wet grinding of chemical liquid products, horizontal sand mills, basket mills, and vertical sand mills have been designed according to different application requirements. These types of sand mills mainly consist of a machine body, grinding cylinder, grinding disc, grinding media, motor, and feed pump. The grinding media of these sand mills generally include zirconia beads, glass beads, and zirconium silicate beads. For example, Chinese patent application publication number CN 120286133 A discloses a vertical sand mill, including a rotary power mechanism, a feed pump, a stirring device, and a grinding cylinder. The stirring device includes a hollow main shaft, a disperser, and a separator. When the rotary power mechanism is working, it can generate centrifugal force in the separator. Under the action of centrifugal force, the grinding media accumulates on the outer periphery of the separator, while the material accumulates in the central area of ​​the separator and is discharged outward. This equipment has good stability and safety during the production process.

[0003] However, the above-mentioned equipment has a complex structure and poor media separation effect, requiring manual replenishment of leaked grinding media. If excessive media leakage is not replenished in time, it will also affect the quality of the ground products. To address these problems, through analysis and optimization of existing technical methods, this utility model proposes a novel vertical sand mill for centrifugal media separation. Utility Model Content

[0004] To address the above deficiencies, this utility model provides a novel vertical sand mill, which optimizes the flow field of the grinding chamber by combining a closed impeller with an open impeller and uses centrifugal force to separate the grinding media. Furthermore, the grinding media accumulated in the settling chamber can automatically flow back to the grinding chamber, and the media will not leak outside the device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A novel vertical sand mill, comprising a grinding chamber with a feed inlet formed between the drive shaft and the inner cylinder inside the machine body, a rear cover installed on the upper side of the outer cylinder, and a sealing mechanism at the bottom of the machine body, the vertical sand mill including:

[0007] The rotor assembly inside the machine body consists of a stirring and dispersing assembly, a closed impeller above the stirring and dispersing assembly, and an open impeller above the closed impeller. The blade tilt angle of the closed impeller is smaller than that of the open impeller. The stirring and dispersing assembly provides kinetic energy to the grinding media. The closed impeller uses the centrifugal force and reaction force generated by its rotation to separate the heavy phase grinding media from the light phase slurry. The open impeller uses the centrifugal force and reaction force generated by its rotation to prevent the grinding media from flowing out of the grinding chamber.

[0008] The gravity settling chamber with a filter screen is located above the machine body and has an inverted cone structure. The bottom of the gravity settling chamber is connected to the central area of ​​the impeller. As the fluid flows from bottom to top, the flow rate slows down due to the gradually increasing cross-section. A small amount of medium that overflows with the slurry is separated by the filter screen and deposited at the bottom of the cone due to gravity, and then flows back into the grinding chamber through the two sets of impellers.

[0009] Further technical measures can be adopted to form corresponding technical solutions, including:

[0010] The rear cover has several sets of circumferential bosses, and the open impeller has several circumferential grooves. The bosses and circumferential grooves intersect to form a labyrinth structure.

[0011] The outer shell and the inner barrel are equipped with a cooling water partition to allow coolant to be injected to cool and lower the temperature of the grinding material.

[0012] The radial thrust generated by the rotation of the open impeller is greater than that of the closed impeller. The two sets of impellers are in the form of reverse arc, straight line, circular arc, volute, or inclined surface structure that can generate reaction force.

[0013] Furthermore, the stirring and dispersing components, open impeller, and closed impeller of the rotor assembly all rotate in the same direction and at the same speed; the centrifugal force and reaction force generated by the open impeller form a flow field towards the grinding chamber to prevent the grinding media from leaking; the gravity settling chamber collects the grinding media that overflows with the slurry and uses gravity to settle it.

[0014] The technical solution of this utility model has a simple, reasonable and compact structure. It uses centrifugal force to replace physical filter screen filtration, which solves the problem of filter screen clogging. The grinding media accumulated in the settling chamber can automatically flow back to the grinding chamber, which ensures the consistency of grinding quality and reduces manual processing time. The grinding media and slurry are completely separated, and the media will not leak outside the device. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic cross-sectional view of the novel vertical sand mill implemented in this utility model;

[0017] Figure 2 This is a schematic diagram of the labyrinth structure formed in the rear cover of the novel vertical sand mill implemented by this utility model.

[0018] Figure 3 This is a schematic diagram of the rotor assembly of the novel vertical sand mill implemented in this utility model;

[0019] Figure 4 This is a schematic diagram of the open impeller of the novel vertical sand mill implemented in this utility model;

[0020] Figure 5 This is a schematic diagram of the enclosed impeller of the novel vertical sand mill implemented in this utility model.

[0021] In the picture:

[0022] 1. Outer drum;

[0023] 2. Inner tub;

[0024] 3. Stirring and dispersing components;

[0025] 4. Enclosed impeller;

[0026] 5. Open impeller;

[0027] 6. Feed inlet;

[0028] 7. Back cover;

[0029] 8. Sealing mechanism;

[0030] 9. Cooling water baffle;

[0031] 10. Coolant inlet;

[0032] 11. Coolant outlet;

[0033] 12. Gravity settling chamber;

[0034] 13. Filter screen;

[0035] 14. Discharge end cover;

[0036] 15. Discharge port;

[0037] 16. Drive shaft;

[0038] 17. End cap boss;

[0039] 18. Circumferential groove;

[0040] 19. Grinding chamber. Detailed Implementation

[0041] The novel vertical sand mill of this utility model mainly separates the grinding media from the slurry through the centrifugal force and reaction force generated by a set of closed impellers; the centrifugal force and reaction force generated by a set of open impellers form a flow field flowing towards the grinding chamber to prevent the grinding media from leaking; the grinding media overflowing with the slurry is collected by the gravity settling chamber and settled by gravity, and as the impeller rotates, the media flows back into the grinding chamber.

[0042] like Figure 1 As shown, the novel vertical sand mill of this utility model comprises a metal outer barrel 1, an inner barrel 2 with wear-resistant properties disposed inside the outer barrel 1, and a rear cover 7 with wear-resistant properties for sealing the upper side of the outer barrel 1. A cooling water partition 9 is formed between the inner wall of the outer barrel 1 and the outer wall of the inner barrel 2. Since the outer barrel 1 has a coolant outlet 11 and a coolant inlet 10 respectively on the upper and lower sides of its outer wall, coolant can be injected to cool and lower the grinding material. At the same time, the inner barrel 2 is also provided with corresponding channels, namely, a feed inlet 6 is opened at the bottom of the inner barrel 2, and a discharge outlet 15 is located at the center of the top of the vertical sand mill.

[0043] like Figure 1-5 As shown, the novel vertical sand mill of this utility model has an internal structure including a drive shaft 16 at the center of the machine body for providing rotational power to the rotor assembly, a sealing mechanism 8 located below the machine body, a rotor assembly assembled inside the inner barrel 2, and a gravity settling chamber 12 above the machine body. The inner barrel 2 and the sealing mechanism 8 form a grinding chamber 19. The specific technical implementation is as follows:

[0044] The novel vertical sand mill of this utility model comprises a rotor assembly consisting of a stirring and dispersing component 3 and two sets of impellers. Specifically, a closed impeller 4 is positioned above the stirring and dispersing component 3, and an open impeller 5 is positioned above this closed impeller. The open impeller has multiple circumferential grooves 18. Since the blade inclination angle of the closed impeller 4 is smaller than that of the open impeller 5, when the stirring and dispersing component 3 provides kinetic energy to the grinding media, the closed impeller 4 uses the centrifugal force and reaction force generated by its rotation to separate the heavy phase grinding media from the light phase slurry. The open impeller 5 uses the centrifugal force and reaction force generated by its rotation to prevent the grinding media from flowing out of the grinding chamber 19. Furthermore, the radial thrust generated by the rotation of the open impeller 5 is greater than that of the closed impeller 4. The two sets of impellers can adopt inclined surface structures that generate reaction force, such as reverse arc, straight line, circular arc, or volute.

[0045] The novel vertical sand mill implemented in this utility model has a gravity settling chamber 12 with a conical structure of "larger at the top and smaller at the bottom" cross-section. The discharge end cover 14 above it is equipped with a filter screen 13. When the fluid flows from bottom to top, the flow rate slows down as the cross-section gradually increases. A small amount of medium that overflows with the slurry is separated by the filter screen and will be deposited at the bottom of the cone mouth under the influence of gravity and will flow back into the grinding chamber 19 through two sets of impellers.

[0046] The novel vertical sand mill implemented in this utility model has several sets of circumferential end cap protrusions 17 on the bottom surface of the rear cover 7. These protrusions intersect with the multiple circumferential grooves 18 of the open impeller 5 to form a labyrinth structure.

[0047] The novel vertical sand mill of this invention features a rotor assembly driven by a drive shaft 16, which rotates within a grinding chamber 19. The grinding chamber 19 is filled with grinding media filling 70% to 85% of its effective volume. The high-speed rotation of the rotor assembly causes the grinding media to gain kinetic energy, resulting in friction, impact, and collision to form a grinding zone. The slurry enters from the bottom inlet 6 of the chamber and flows upwards through the grinding chamber 19 into the closed impeller 4 at the top of the rotor. The centrifugal force and reaction force generated by the rotation of the closed impeller 4 separate the heavy phase grinding media from the light phase slurry. The separated light phase slurry flows towards the center of the closed impeller 4. Meanwhile, an open impeller 5 is provided above the closed impeller 4. After the impeller rotates, the pressure in the inner ring is higher than that in the outer ring. Due to the pressure, the slurry forms a flow field from the inside to the outside. In the flow field, the slurry is subjected to fluid viscosity and centrifugal force, which prevents the grinding media from leaking into the central area of ​​the impeller. Since the central area of ​​the impeller is connected to the gravity settling chamber 12, which has a structure that is larger at the top and smaller at the bottom, the fluid velocity slows down from bottom to top. A small amount of media that overflows with the slurry is filtered out by the filter screen 13 and then accumulated by gravity settling before being thrown back into the grinding chamber 19 by the impeller. The filtered slurry flows to the discharge port 15. In addition, in other implementations, technicians can design the sealing mechanism 8 in conjunction with existing technology. For example, a cartridge-type double-end mechanical seal can be adopted to achieve rotary shaft sealing through relative sliding on the end face perpendicular to the rotation axis to prevent fluid leakage.

[0048] The technical solution implemented by this utility model mainly proposes to optimize the flow field of the grinding chamber and separate the grinding media by designing a grinding device that combines a closed impeller and an open impeller. Due to different design and application requirements, there are no mandatory requirements for the motor model, transmission structure, impeller assembly dimensions, etc., used in practice, as these alternatives are not significantly related to the technical solution implemented by this utility model. Those skilled in the art can refer to existing conventional technical methods for selection and implementation.

[0049] In the description of this specification, the terms "connection", "set", "have", etc. are interpreted in a broad sense. For example, "connection" can be a fixed connection or an indirect connection through an intermediate component without affecting the relationship between components and the technical effect. It can also be an integral connection or a partial connection. In such cases, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] The above description of the embodiments is intended to enable those skilled in the art to understand and apply them. It is obvious to those skilled in the art that they can easily make various modifications to these examples and apply the general principles described herein to other embodiments without creative effort. Therefore, the protection scope of this utility model is not limited to the above situations.

Claims

1. A novel vertical sand mill, wherein a grinding chamber with a feed inlet is formed between the drive shaft and the inner cylinder inside the machine body, a rear cover is provided on the upper side of the outer cylinder, and a sealing mechanism is located at the bottom of the machine body, characterized in that, The vertical sand mill includes: The rotor assembly inside the machine body consists of a stirring and dispersing assembly, a closed impeller above the stirring and dispersing assembly, and an open impeller above the closed impeller. The blade tilt angle of the closed impeller is smaller than that of the open impeller. The stirring and dispersing assembly provides kinetic energy to the grinding media. The closed impeller uses the centrifugal force and reaction force generated by its rotation to separate the heavy phase grinding media from the light phase slurry. The open impeller uses the centrifugal force and reaction force generated by its rotation to prevent the grinding media from flowing out of the grinding chamber. The gravity settling chamber with a filter screen is located above the machine body and has an inverted cone structure. The bottom of the gravity settling chamber is connected to the central area of ​​the impeller. As the fluid flows from bottom to top, the flow rate slows down due to the gradually increasing cross-section. A small amount of medium that overflows with the slurry is separated by the filter screen and deposited at the bottom of the cone due to gravity, and then flows back into the grinding chamber through the two sets of impellers.

2. The novel vertical sand mill according to claim 1, characterized in that: The rear cover is provided with several sets of circumferential bosses, and the open impeller is provided with several circumferential grooves. The bosses and circumferential grooves intersect to form a labyrinth structure.

3. The novel vertical sand mill according to claim 1, characterized in that: A cooling water partition is provided between the outer barrel and the inner barrel to allow for the injection of coolant to cool and lower the temperature of the grinding material.

4. The novel vertical sand mill according to claim 1, characterized in that: The radial thrust generated by the rotation of the open impeller is greater than that of the closed impeller. Both sets of impellers are in the form of reverse arc, straight line, circular arc, volute, or inclined surface structure that can generate reaction force.

5. The novel vertical sand mill according to any one of claims 1-4, characterized in that: The rotor assembly's stirring and dispersing components, open impeller, and closed impeller all rotate in the same direction and at the same speed.

6. The novel vertical sand mill according to any one of claims 1-4, characterized in that: The centrifugal force and reaction force generated by the open impeller form a flow field towards the grinding chamber to prevent leakage of the grinding media.

7. The novel vertical sand mill according to claim 6, characterized in that: The gravity settling chamber collects the grinding media that overflows with the slurry and uses gravity to settle them.

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