Rotor water cooled colloid mill

Abstract

The utility model discloses a rotor water -cooling colloid mill applied to the field of grinding, its rotating part includes fixed connection's rotor, bottom plate and hollow shaft, and the rotor is hollow, and the top arc is fixedly connected with the bottom plate, and forms the inner cooling chamber. Hollow shaft is installed in the center of bottom plate, and the inner water outlet of its upper end extends into the inner cooling chamber, and the lower extreme is rotatably connected with motor. The inner water inlet pipe is sleeved in the center hole of hollow shaft, and the inner diameter of center hole is not less than four times of the outer diameter of inner water inlet pipe, and the inner water inlet is higher than the inner water outlet. The buffer water tank is arranged below the hollow shaft, and the buffer water tank bottom installs the backwater pipe. The annular outer cooling chamber of fixed part is water -cooled stator. The utility model passes into the cooling water in the inner cooling chamber, utilizes the shape of rotor and water flow pressure difference, and promotes the cooling of rotor.

Description

Technical Field

[0001] This utility model is applied to the field of grinding, and relates to a colloid mill for low-temperature grinding of malt, specifically a colloid mill capable of low-temperature grinding with a water-cooled rotor. Background Technology

[0002] Colloid mills, as grinding machinery, have become indispensable grinding and pulverizing equipment in many industries such as food, chemical, and pharmaceutical due to their high grinding and emulsification capabilities, large throughput, narrow particle size distribution, compact structure, simple operation, environmental friendliness and energy saving, multi-functional applications, and customized production. To achieve grinding malt at temperatures below 60℃ and avoid the loss of organic selenium, the applicant has applied for a low-temperature grinding colloid mill (application number 2025220812458). The stator structure was modified by the colloid mill manufacturer and specially customized, employing a low-temperature coolant to cool the stator. However, the rotor is the main source of grinding heat. Based on stator cooling, the applicant has improved the rotor structure of the colloid mill to achieve rotor cooling, thereby increasing the grinding speed and improving grinding efficiency.

[0003] Regarding rotating body cooling, CN204681184U discloses a rotor water-cooling structure. This structure achieves cooling at the rotor core by introducing cold water into the hollow rotor shaft and allowing hot water to flow out. The cooling water directly cools the shaft, not the rotor itself; heat transfer from the rotor to the shaft is required. CN220382886U discloses a cooling device for a permanent magnet electric drum. The drum contains a stator and a rotor, which are fixedly connected to the rotor via a main hollow shaft. The rotor contains a cooling chamber with a rotary joint installed in the inlet pipe. The outlet of the cooling chamber connects to a cooling pipe within the drum, and the outlet pipe connects to a return pipe via an auxiliary hollow shaft. This achieves cooling of the rotor, stator, and drum. However, this cooling method involves numerous water flow bends and a large pressure drop, requiring high water pressure and demanding high-quality rotary joints. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a rotor water-cooled colloid mill, in which cooling water is provided in the inner cavity of the rotor to cool the rotor.

[0005] The technical solution adopted in this utility model is as follows: The rotor water-cooled colloid mill of this utility model includes a fixed component and a rotating component. The rotating component includes a rotor, a base plate, and a hollow shaft that are fixedly connected; the rotor is hollow and cap-shaped, with an arc-shaped top and a bottom fixedly connected to the base plate, forming an inner cooling cavity. The hollow shaft is installed at the center of the base plate and fixedly connected to it. An inner water outlet is provided at the upper end of the hollow shaft, extending into the inner cooling cavity, and the lower end of the hollow shaft is rotatably connected to a motor. An inner water inlet pipe is fitted inside the central hole of the hollow shaft, and the inner water inlet of the inner water inlet pipe is higher than the inner water outlet.

[0006] Furthermore, to facilitate the collection of return water flowing out of the inner cooling chamber, a buffer water tank is installed below the hollow shaft, and a return water pipe is installed at the bottom of the buffer water tank. To increase the stability of the inner water inlet pipe in the central hole of the hollow shaft, a fixing bracket is welded inside the buffer water tank. The fixing bracket is located below the hollow shaft, adjacent to the lower end of the hollow shaft, and is welded and fixed to the inner water inlet pipe.

[0007] Furthermore, to reduce the resistance to water flow in the inner cooling chamber and increase the stability of the inner water inlet pipe, the inner diameter of the central hole is not less than four times the outer diameter of the inner water inlet pipe. The inner water inlet pipe should preferably be located at the center of the central hole.

[0008] Furthermore, the fixing components include a fixedly installed top plate, outer cylinder, stator, and platform. The stator is installed at the center of the outer cylinder. The top plate and platform are located at the top and bottom of the outer cylinder and stator, respectively, forming an annular outer cooling cavity. An external water inlet pipe is installed at the lower part of the outer cooling cavity, and an external water outlet pipe is installed at the upper part. To enhance the cooling effect of the stator, spiral blades are provided on the outer circumference of the stator. The external water inlet pipe is located below the spiral blades, and the external water outlet pipe is located above the spiral blades. To enhance the circumferential flow of cooling water within the outer cooling cavity, both the external water inlet pipe and the external water outlet pipe are tangentially connected to the outer cooling cavity.

[0009] Furthermore, the rotor and stator cooperate to form a grinding chamber, with the upper part of the grinding chamber connected to a feeding hopper and the bottom connected to a colloid outlet pipe.

[0010] The beneficial effects of this utility model are: cooling water is introduced into the internal cooling chamber, and the rotor cooling is promoted by utilizing the shape of the rotor and the pressure difference of the water flow. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the main structure of Example 1; Figure 2 This is a partial structural front view schematic diagram of Example 2; In the diagram: 1-Top plate, 2-Outer cylinder, 3-Stator, 4-Spiral blade, 5-Outer water inlet pipe, 6-Tabletop, 7-Inner water outlet, 8-Inner water inlet pipe, 9-Buffer water tank, 10-Return water pipe, 11-Hollow shaft, 12-Pulley, 13-Bottom plate, 14-Colloid outlet pipe, 15-Rotor, 16-Inner water inlet, 17-Outer water inlet pipe, 18-Feeding hopper, 19-Fixing frame. Detailed Implementation

[0012] This utility model focuses on describing the internal and external cooling structure and modular assembly of the colloid mill. Structures not described in detail, such as the transmission, sealing, positioning, and fixed support of the colloid mill, belong to the prior art. Example 1

[0013] The structure of the colloid mill in this embodiment is shown in the appendix. Figure 1 The system includes fixed components and rotating components. The fixed components include a fixedly installed top plate 1, outer cylinder 2, stator 3, and platform 6, with platform 6 mounted on a fixed support. A feeding hopper 18 is located at the upper center of the top plate 1. The stator 3 is installed at the center of the outer cylinder 2. The top plate 1 and platform 6 are located at the top and bottom of the outer cylinder 2 and stator 3, respectively, forming an annular outer cooling chamber. An external water inlet pipe 5 is installed at the lower part of the outer cooling chamber, and an external water outlet pipe 17 is installed at the upper part. Cooling water flows into the outer cooling chamber from the external water inlet pipe 5, cooling the stator 3, and then flows out from the external water outlet pipe 17 after heat exchange. To enhance the cooling water heat exchange, spiral blades 4 are provided on the outer circumference of the stator 3. The external water inlet pipe 5 is preferably below the spiral blades 4, and the external water outlet pipe 17 is preferably above the spiral blades 4. To ensure smooth annular flow of cooling water around the spiral blades, the inlet and outlet of the outer cooling chamber are tangentially connected to the outer cooling chamber.

[0014] The rotating components include a rotor 15, a base plate 13, and a hollow shaft 11, all fixedly connected. The rotor 15 mates with the stator 3, and the space between them forms a grinding chamber. The upper part of the grinding chamber is connected to a feeding hopper 18, and the bottom is connected to a colloid outlet pipe 14. The rotor 15 is a hollow cap shape with an arc-shaped top, and its bottom is fixedly connected to the base plate 13, forming an inner cooling chamber. The hollow shaft 11 is located at the center of the base plate 13 and is fixedly connected to it. The upper end of the hollow shaft extends into the inner cooling chamber, and multiple inner water outlets 7 are evenly distributed around its circumference, located in the lower part of the inner cooling chamber. At the lower end of the hollow shaft, a pulley 12 is fixedly connected, and the pulley 12 is connected to the drive motor via a belt drive.

[0015] An inner water inlet pipe 8 is fitted inside the center hole of the hollow shaft 11. The inner water inlet pipe 8 is fixedly mounted on a fixed support and stably positioned within the center hole of the hollow shaft 11, without contacting the hollow shaft of the rotating component. It is preferably located at the center of the center hole. The inner water inlet 16 of the inner water inlet pipe 8 extends into the upper part of the inner cooling chamber, higher than the inner water outlet 7. A buffer water tank 9 is installed below the hollow shaft 11, and a return water pipe 10 is installed at the bottom of the buffer water tank. Both the buffer water tank 9 and the return water pipe 10 are mounted on the fixed support.

[0016] In this embodiment, during operation, the drive unit rotates the hollow shaft 11 via a belt and pulley, and the hollow shaft 11 drives the rotor 15 to rotate via the base plate 13. Malt material and ice cubes fall into the grinding chamber from the feeding hopper. The rotating rotor 15 cooperates with the stator 3 to grind the malt into a colloidal material, which flows out of the colloid mill from the colloid outlet pipe 14. During the malt grinding process, cooling water is circulated in both the inner and outer cooling chambers. The cooling water in the outer cooling chamber cools the stator 3, and the cooling water in the inner cooling chamber cools the rotor 15. The cooling water in the inner cooling chamber flows in from the inner inlet 16, curves back along the top of the rotor 15, flows down its inner surface, and finally flows into the central hole of the hollow shaft from the gap between the hollow shaft 11 and the inner inlet pipe 8, as well as from the circumferentially distributed inner outlets 7. When the cooling water flows out of the hollow shaft, due to the rotation of the hollow shaft, the cooling water is centrifugally thrown out, collides with the wall of the buffer water tank 9 and falls into the buffer water tank, and then returns to the cooling water cooling device through the return water pipe 10.

[0017] In this embodiment, the cooling water in the internal cooling chamber flows along the arrow shown in the attached figure, transferring the heat of the rotor away, thereby achieving rotor cooling. Example 2

[0018] This embodiment is an improvement on a partial structure of Embodiment 1, as shown in the attached figure. Figure 2 As shown. Specific improvements are as follows: 1) Increase the inner diameter of the central hole of the hollow shaft 11 to increase the radius difference between it and the inner water inlet pipe 8 at the center. The inner diameter of the central hole should not be less than four times the outer diameter of the inner water inlet pipe 8. This serves several purposes: First, it increases the outlet cross-sectional area of ​​the cooling water, ensuring sufficient flow area and reducing flow resistance. Second, it reduces the impact of the water outlet on the stability of the inner water inlet pipe during high-speed rotation of the hollow shaft. A larger radius difference results in a smaller velocity gradient of the return water rotating radially within the central hole of the hollow shaft, leading to less friction in the shear direction on the inner water inlet pipe 8. Third, it provides tolerance space for the coaxiality between the inner water inlet pipe and the hollow shaft, reducing assembly precision requirements and further improving structural stability and cooling efficiency. Fourth, reducing the inner diameter of the inner water inlet pipe 8, under the same water flow conditions, helps to enhance the jetting of the cooling water.

[0019] 2) The inner inlet 16 is lowered, slightly higher than the inner outlet 7. In this embodiment, due to the increased inner diameter of the central hole of the hollow shaft, the circumferentially distributed inner outlets of Embodiment 1 are not used; instead, the central hole is used as the inner outlet. Lowering the inner inlet has two advantages: first, it reduces the length of the inner inlet pipe 8, which helps increase its stability; second, when the cooling water is sprayed out at high pressure from the inner inlet 16, a negative pressure zone relative to the water flow pressure is generated in its vicinity. This negative pressure zone attracts the surrounding water flow, promoting the flow of cooling water towards the inner outlet 7 and strengthening the flow of cooling water in the inner cooling chamber. The cooling water at the inner outlet 7 flows down into the buffer water tank 9 under its own weight.

[0020] 3) Weld a fixing frame 19 inside the buffer water tank 9. The fixing frame 19 is located below the hollow shaft 11, adjacent to the lower end of the hollow shaft 11, and welded to the inner water inlet pipe 8 to strengthen and stabilize the inner water inlet pipe 8 and increase its stability.

[0021] Compared with Example 1, the inner water inlet pipe 8 is more stable, the cooling water flow in the inner cooling chamber is smoother, and the cooling effect is better. In addition, in terms of cooling effect and stability of the inner water inlet pipe, the rotor speed can be adjusted to a high speed, thereby improving the grinding efficiency of malt.

Claims

1. A rotor-cooled colloid mill, characterized in that: It includes a fixed component and a rotating component; the rotating component includes a rotor (15), a base plate (13) and a hollow shaft (11) that are fixedly connected; the rotor (15) is hollow and cap-shaped, with an arc-shaped top and a fixed connection between the bottom and the base plate (13), forming an inner cooling cavity; the hollow shaft (11) is installed at the center of the base plate (13) and is fixedly connected to the base plate (13); the upper end of the hollow shaft (11) is provided with an inner water outlet (7), which extends into the inner cooling cavity, and the lower end of the hollow shaft (11) is rotatably connected to the motor; an inner water inlet pipe (8) is fitted inside the center hole of the hollow shaft (11), and the inner water inlet (16) of the inner water inlet pipe (8) is higher than the inner water outlet (7).

2. The rotor-cooled colloid mill according to claim 1, characterized in that: Below the hollow shaft (11), a buffer water tank (9) is provided, and a return water pipe (10) is installed at the bottom of the buffer water tank (9).

3. A rotor-cooled colloid mill according to claim 2, characterized in that: The buffer water tank (9) is equipped with a welded fixing frame (19), which is located below the hollow shaft (11) and is welded to the inner water inlet pipe (8).

4. A rotor-cooled colloid mill according to claim 1, characterized in that: The inner diameter of the central hole is not less than four times the outer diameter of the inner water inlet pipe (8).

5. A rotor-cooled colloid mill according to claim 1, characterized in that: The inner water inlet pipe (8) is arranged at the center of the central hole.

6. A rotor-cooled colloid mill according to claim 1, characterized in that: The fixing components include a fixedly installed top plate (1), outer cylinder (2), stator (3) and platform (6). The stator (3) is installed in the center of the outer cylinder (2). The top plate (1) and platform (6) are located at the top and bottom of the outer cylinder (2) and stator (3) respectively, forming an annular outer cooling cavity. An external water inlet pipe (5) is installed at the lower part of the outer cooling cavity, and an external water outlet pipe (17) is installed at the upper part.

7. A rotor-cooled colloid mill according to claim 6, characterized in that: The stator (3) has a spiral blade (4) on its outer circumference, the external water inlet pipe (5) is located below the spiral blade (4), and the external water outlet pipe (17) is located above the spiral blade (4).

8. A rotor-cooled colloid mill according to claim 7, characterized in that: Both the external water inlet pipe (5) and the external water outlet pipe (17) are tangentially connected to the external cooling cavity.

9. A rotor-cooled colloid mill according to claim 1, characterized in that: The rotor (15) and stator (3) are combined to form a grinding chamber. The upper part of the grinding chamber is connected to the feeding hopper (18), and the bottom part is connected to the colloid outlet pipe (14).

Images