Stirring kettle for preparing silicon carbide powder

Abstract

The utility model relates to a silicon carbide powder preparation stirring kettle which comprises a kettle body and a kettle cover, and a stirring mechanism and a lifting mechanism are arranged on the kettle cover; a heat exchange assembly for heating silicon carbide powder is arranged in the bottom of the kettle body; and the outer wall of the bottom of the kettle body is provided with a backflow assembly for carrying out backflow on the silicon carbide powder. Omni-directional and multi-layer stirring of silicon carbide powder from the bottom to the liquid level is achieved through a liquid level stirring rod and a bottom layer stirring rod of the stirring mechanism, the liquid level stirring rod comprises a center stirring rod and an edge stirring rod, it is ensured that stirring force is evenly distributed around a stirring shaft through different layouts of the center stirring rod and the edge stirring rod, and local accumulation or agglomeration of the powder is effectively prevented; meanwhile, the bottom-layer stirring rod adopts an inclined stirring rod design and can penetrate into the bottom of the kettle body, so that the stirring effect of the powder at the bottom is further enhanced, and the overall uniformity of the silicon carbide powder is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the technical field of silicon carbide production equipment, specifically to a standby stirring vessel for silicon carbide powder production. Background Technology

[0002] In the preparation of silicon carbide powder, stirring is a crucial step, directly affecting the uniformity and quality of the powder. Traditional stirring equipment, such as stirred tanks, presents several significant problems when stirring silicon carbide powder. First, due to the physical characteristics of silicon carbide powder, such as particle size, density, and flowability, traditional fixed-height stirring mechanisms often struggle to achieve uniform stirring. Particularly during stirring, silicon carbide powder tends to accumulate or agglomerate at the bottom and near the liquid surface of the stirred tank, resulting in poor stirring performance and impacting product quality. Furthermore, the preparation of silicon carbide powder requires heat treatment to promote chemical reactions and physical changes. However, traditional stirred tanks typically have a heating jacket added to the outer wall, but external heating is not ideal, exhibiting slow heat conduction and high energy consumption, further affecting the preparation effect of silicon carbide powder.

[0003] Therefore, to address the shortcomings of existing technologies, it is necessary to improve the current stirred tank technology to meet usage requirements. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a standby stirring vessel for silicon carbide powder that allows for adjustment of the stirring height, thereby enabling uniform stirring of silicon carbide.

[0005] The technical problem to be solved by this utility model is achieved through the following technical solution: a standby stirring vessel for silicon carbide powder preparation, which includes a vessel body and a vessel cover connected to the vessel body by a flange. The vessel cover is provided with a feed port, and the bottom of the vessel body is provided with a discharge port. The vessel cover is provided with a stirring mechanism that extends into the vessel body to stir the silicon carbide powder in the vessel body. The vessel cover next to the stirring mechanism is also provided with a lifting mechanism that drives the stirring mechanism to move vertically, thereby changing the stirring height of the stirring mechanism.

[0006] The stirring mechanism includes a stirring base placed above the vessel lid, a rotary power mechanism fixedly installed on the bottom surface of the stirring base, a rotating shaft installed at the power output end of the rotary power mechanism via a coupling, the bottom of the rotating shaft extending into the bottom of the vessel body, a liquid surface stirring rod fixedly provided on the outer circumferential surface of the middle part of the rotating shaft, and a bottom stirring rod fixedly provided on the outer circumferential surface of the bottom of the rotating shaft.

[0007] The lifting mechanism includes several lifting power mechanisms. The bottom of the lifting power mechanism is fixedly installed on the top of the lid. The power output end of the lifting power mechanism is fixedly installed on the bottom surface of the stirring base. A linear bearing is embedded in the middle of the lid. A rotary bearing is fixedly installed on the inner ring of the linear bearing. The top outer circumference of the rotary shaft is fixedly installed on the inner ring of the rotary bearing.

[0008] A heat exchange component for heating silicon carbide powder is installed at the bottom of the reactor body;

[0009] A reflux assembly for refluxing silicon carbide powder is installed on the bottom outer wall of the reactor body.

[0010] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the silicon carbide powder preparation standby stirring vessel described above, wherein the liquid surface stirring rod includes;

[0011] A central stirring rod is symmetrically fixed on the outer circumferential surface of the middle part of the stirring shaft;

[0012] The edge stirring rods are symmetrically fixed on the outer circumference of the middle part of the stirring shaft, and the edge stirring rods are located below the central stirring rod;

[0013] Both the central stirring rod and the edge stirring rod include a horizontal part and a vertical part. The horizontal part of the central stirring rod and the edge stirring rod is fixed horizontally on the outer circumference of the stirring shaft, and the vertical part of the central stirring rod and the edge stirring rod is fixed vertically on the end of the horizontal part. The distance between the vertical part of the central stirring rod and the stirring shaft is less than the distance between the vertical part of the edge stirring rod and the stirring shaft.

[0014] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the silicon carbide powder preparation mixing vessel described above, wherein the bottom stirring rod includes inclined stirring rods symmetrically fixed on the outer circumferential surface of the bottom of the stirring shaft, and the angle between the axis of the inclined stirring rod and the axis of the stirring shaft is an acute angle.

[0015] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the silicon carbide powder preparation standby stirring vessel described above, wherein the heat exchange component includes a heat exchange ring tube fixedly installed on the inner wall of the bottom of the vessel body, and the inlet and outlet of the heat exchange ring tube are located outside the vessel body.

[0016] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the silicon carbide powder preparation mixing vessel described above, wherein the reflux assembly includes a reflux pipe fixedly installed on the outer wall of the vessel body, the inlet end of the reflux pipe extending into the bottom wall of the vessel body, the outlet end of the reflux pipe extending into the top wall of the vessel body, and a reflux pump installed in the middle of the reflux pipe, the reflux pump being fixed on the middle outer wall of the vessel body.

[0017] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0018] (1) The stirring mechanism uses a liquid surface stirring rod and a bottom stirring rod to achieve all-round and multi-level stirring of silicon carbide powder from the bottom to the liquid surface. The liquid surface stirring rod includes a central stirring rod and an edge stirring rod. Their different layouts ensure that the stirring force is evenly distributed around the stirring shaft, effectively preventing local accumulation or agglomeration of the powder. At the same time, the bottom stirring rod adopts an inclined stirring rod design, which can penetrate deep into the bottom of the vessel, further enhancing the stirring effect of the bottom powder, thereby significantly improving the overall uniformity of silicon carbide powder.

[0019] (2) The added lifting mechanism enables the stirring mechanism to move vertically as needed, which not only adapts to the requirements of stirring depth under different process conditions, but also allows for real-time adjustment based on the state of the powder during the stirring process, greatly enhancing the applicability and production efficiency of the stirring vessel.

[0020] (3) By setting heat exchange components at the bottom of the vessel, direct heating of silicon carbide powder is achieved. The design of the heat exchange ring tube ensures uniform heat distribution and avoids the hot and cold spot problems in traditional heating methods, thereby improving heating efficiency.

[0021] (4) The reflux assembly can reflux the material at the bottom of the vessel to the top through the reflux pipe, realizing the circulation of the material. This not only helps to further mix evenly, but also effectively prevents the problem of uneven heating and cooling between the upper and lower layers of silicon carbide powder in the stirring vessel. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0023] Reference numerals in the attached drawings: 1. Vessel body; 2. Vessel lid; 3. Feed inlet; 4. Discharge outlet; 5. Stirring base; 6. Rotary power mechanism; 7. Rotating shaft; 8. Central stirring rod; 9. Edge stirring rod; 10. Inclined stirring rod; 11. Lifting power mechanism; 12. Linear bearing; 13. Heat exchange ring tube; 14. Reflux tube; 15. Reflux pump. Detailed Implementation

[0024] The specific technical solutions of this utility model are further described below with reference to the accompanying drawings, so as to enable those skilled in the art to further understand this utility model, without constituting a limitation on its rights.

[0025] Example 1, referring to Figure 1A standby stirring vessel for silicon carbide powder preparation includes a vessel body 1 and a vessel cover 2 connected to the vessel body 1 by a flange. The vessel cover 2 is provided with a feed inlet 3, and the bottom of the vessel body 1 is provided with a discharge outlet 4. The vessel cover 2 is provided with a stirring mechanism that extends into the vessel body 1 to stir the silicon carbide powder inside the vessel body 1. The vessel cover 2 next to the stirring mechanism is also provided with a lifting mechanism that drives the stirring mechanism to move vertically, thereby changing the stirring height of the stirring mechanism.

[0026] The stirring mechanism includes a stirring base 5 placed above the vessel lid 2. The stirring base 5 is formed into a roughly circular plate structure. A rotary power mechanism 6 is fixedly installed on the bottom surface of the stirring base 5. The rotary power mechanism 6 can be a rotary motor. A rotary shaft 7 is installed at the power output end of the rotary power mechanism 6 through a coupling. The bottom of the rotary shaft 7 extends into the bottom of the vessel body 1. A liquid surface stirring rod is fixedly provided on the outer circumferential surface of the middle part of the rotary shaft 7. The liquid surface stirring rod includes:

[0027] A central stirring rod 8 is symmetrically fixed on the outer circumferential surface of the middle part of the stirring shaft;

[0028] The edge stirring rods 9 are symmetrically fixed on the outer circumference of the middle part of the stirring shaft, and the edge stirring rods 9 are located below the central stirring rod 8;

[0029] Both the central stirring rod 8 and the edge stirring rod 9 include a horizontal part and a vertical part, which are respectively a vertical rod and a horizontal rod. The horizontal part of the central stirring rod 8 and the edge stirring rod 9 is horizontally fixed on the outer circumference of the stirring shaft, and the vertical part of the central stirring rod 8 and the edge stirring rod 9 is vertically fixed on the end of the horizontal part. The distance between the vertical part of the central stirring rod 8 and the stirring shaft is less than the distance between the vertical part of the edge stirring rod 9 and the stirring shaft. The distance value can be selected according to the usage requirements.

[0030] A bottom stirring rod is fixedly provided on the bottom outer circumferential surface of the rotating shaft 7. The bottom stirring rod includes an inclined stirring rod 10 symmetrically fixed on the bottom outer circumferential surface of the stirring shaft. The inclined stirring rod 10 is formed into a roughly circular rod structure. The angle between the axis of the inclined stirring rod 10 and the axis of the stirring shaft is an acute angle. The specific angle can be selected according to the usage requirements, for example, 30°.

[0031] The lifting mechanism includes several lifting power mechanisms 11, which can be either pneumatic cylinders or electric cylinders. The bottom of the lifting power mechanism 11 is fixedly installed on the top of the lid 2, and the power output end of the lifting power mechanism 11 is fixedly installed on the bottom surface of the stirring base 5. A linear bearing 12 is embedded in the middle of the lid 2, and a rotary bearing is fixedly installed on the inner ring of the linear bearing 12. The top outer circumferential surface of the rotary shaft 7 is fixedly installed on the inner ring of the rotary bearing.

[0032] A heat exchange assembly for heating silicon carbide powder is provided inside the bottom of the vessel body 1. The heat exchange assembly includes a heat exchange ring tube 13 fixedly installed on the inner wall of the bottom of the vessel body 1, and the inlet and outlet of the heat exchange ring tube 13 are located outside the vessel body 1.

[0033] A reflux assembly for refluxing silicon carbide powder is provided on the bottom outer wall of the vessel body 1. The reflux assembly includes a reflux pipe 14 fixedly installed on the outer wall of the vessel body 1. The reflux pipe 14 is vertically arranged, with its inlet end extending into the bottom wall of the vessel body 1 and its outlet end extending into the top wall of the vessel body 1. A reflux pump 15 is installed in the middle of the reflux pipe 14 and is fixed on the middle outer wall of the vessel body 1.

[0034] (1) Feeding stage: Open the feed port 3 on the lid 2 and put the silicon carbide powder raw material and other necessary additives or auxiliary materials into the mixing vessel in a certain proportion;

[0035] (2) Stirring stage: Start the rotary power mechanism 6 to make the rotary shaft 7 start to rotate, which in turn drives the liquid surface stirring rod and the bottom stirring rod to stir the silicon carbide powder. In the early stage of stirring, the stirring mechanism is set at a higher position through the lifting mechanism to better mix the materials. In the later stage of stirring, the height of the stirring mechanism can be gradually reduced to ensure that the materials can be fully stirred at the bottom of the kettle body 1.

[0036] (3) Heating stage: Start the heat exchange ring tube 13 in the heat exchange assembly to heat the silicon carbide powder through an external heat source;

[0037] (4) Reflux stage: Start the reflux pump 15 in the reflux assembly to allow the material at the bottom of the vessel 1 to reflux back to the top of the vessel 1 through the reflux pipe 14. The reflux process can be carried out continuously or intermittently as needed. Through reflux, the mixing and uniformity of the material can be further promoted, and it also helps to prevent the material from depositing or overheating at the bottom of the vessel 1.

[0038] (5) Discharge stage: After the stirring, heating and reflux process is completed, turn off the power of the rotary power mechanism 6, lifting mechanism, heat exchange component and reflux component, open the discharge port 4 at the bottom of the kettle body 1, and discharge the stirred silicon carbide powder from the stirring kettle.

Claims

1. A stirring vessel for preparing silicon carbide powder, characterized in that: It includes a vessel body and a vessel cover connected to the vessel body by a flange. The vessel cover is provided with a feed inlet, and the bottom of the vessel body is provided with a discharge outlet. The vessel cover is provided with a stirring mechanism that extends into the vessel body to stir the silicon carbide powder inside the vessel. The vessel cover next to the stirring mechanism is also provided with a lifting mechanism that drives the stirring mechanism to move vertically, thereby changing the stirring height of the stirring mechanism. The stirring mechanism includes a stirring base placed above the vessel lid, a rotary power mechanism fixedly installed on the bottom surface of the stirring base, a rotating shaft installed at the power output end of the rotary power mechanism via a coupling, the bottom of the rotating shaft extending into the bottom of the vessel body, a liquid surface stirring rod fixedly provided on the outer circumferential surface of the middle part of the rotating shaft, and a bottom stirring rod fixedly provided on the outer circumferential surface of the bottom of the rotating shaft. The lifting mechanism includes several lifting power mechanisms. The bottom of the lifting power mechanism is fixedly installed on the top of the lid. The power output end of the lifting power mechanism is fixedly installed on the bottom surface of the stirring base. A linear bearing is embedded in the middle of the lid. A rotary bearing is fixedly installed on the inner ring of the linear bearing. The top outer circumference of the rotary shaft is fixedly installed on the inner ring of the rotary bearing. A heat exchange component for heating silicon carbide powder is installed at the bottom of the reactor body; A reflux assembly for refluxing silicon carbide powder is installed on the bottom outer wall of the reactor body.

2. The standby stirring vessel for silicon carbide powder preparation according to claim 1, characterized in that: The liquid surface stirring rod includes: A central stirring rod is symmetrically fixed on the outer circumferential surface of the middle part of the stirring shaft; The edge stirring rods are symmetrically fixed on the outer circumference of the middle part of the stirring shaft, and the edge stirring rods are located below the central stirring rod; Both the central stirring rod and the edge stirring rod include a horizontal part and a vertical part. The horizontal part of the central stirring rod and the edge stirring rod is fixed horizontally on the outer circumference of the stirring shaft, and the vertical part of the central stirring rod and the edge stirring rod is fixed vertically on the end of the horizontal part. The distance between the vertical part of the central stirring rod and the stirring shaft is less than the distance between the vertical part of the edge stirring rod and the stirring shaft.

3. The standby stirring vessel for silicon carbide powder preparation according to claim 1, characterized in that: The bottom stirring rod includes inclined stirring rods symmetrically fixed on the outer circumference of the bottom of the stirring shaft, and the angle between the axis of the inclined stirring rod and the axis of the stirring shaft is an acute angle.

4. The standby stirring vessel for silicon carbide powder preparation according to claim 1, characterized in that: The heat exchange assembly includes a heat exchange ring tube fixedly installed on the inner wall of the bottom of the vessel, with the inlet and outlet of the heat exchange ring tube located outside the vessel.

5. The standby stirring vessel for silicon carbide powder preparation according to claim 1, characterized in that: The reflux assembly includes a reflux pipe fixedly installed on the outer wall of the vessel body. The inlet end of the reflux pipe extends into the bottom wall of the vessel body, and the outlet end of the reflux pipe extends into the top wall of the vessel body. A reflux pump is installed in the middle of the reflux pipe and is fixed on the middle outer wall of the vessel body.

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