Material receiving mechanism of chemical vapor infiltration reactor

Abstract

The utility model discloses a material receiving mechanism of a chemical vapor infiltration reactor, which comprises a cooling component, the cooling component comprises a fixed cylinder and a connecting pipe arranged at one end of the fixed cylinder in a communicated manner, a cooling cavity is coaxially formed in the fixed cylinder, and the cooling cavity is communicated with the connecting pipe; according to the utility model, the narrow part is utilized to accelerate the flow speed of materials to form pressure difference, so that cooling nitrogen in the cooling cavity automatically enters the flow channels to exchange heat with the materials, and the cooling nitrogen is in full contact with the materials in an omnibearing and multi-angle manner to exchange heat; the material cooling uniformity is guaranteed to a great extent, the cooled materials enter the separator in the tangential direction to form rotating airflow, efficient separation of particulate matter and gas is achieved through the centrifugal force principle, effective collection of products is guaranteed, and meanwhile the cleanliness of the products is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of chemical vapor permeation technology, and in particular to the material receiving mechanism of a chemical vapor permeation reactor. Background Technology

[0002] Chemical vapor infiltration (CVI) is a method of densifying materials by decomposing and condensing one or more hydrocarbon gaseous compounds at high temperatures and then depositing the carbon inside a porous medium. It is a newly developed technology for preparing inorganic materials and is also known as chemical vapor deposition.

[0003] In chemical vapor infiltration (CVI) processes, the chemical reactions inside the reactor are usually carried out at high temperatures. Therefore, the products after the reaction will carry a large amount of residual heat. Current collection mechanisms mostly use static cooling or single-path cooling, which can easily lead to large temperature differences between the inside and outside of the particles, uneven cooling, and thermal stress damage or structural defects in the materials. Therefore, a collection mechanism for CVI reactors is proposed to solve this problem. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing the following technical solution:

[0005] The receiving mechanism of a chemical vapor permeation reactor includes:

[0006] A cooling assembly includes a fixed cylinder and a connecting pipe disposed at one end of the fixed cylinder. A cooling chamber is coaxially formed inside the fixed cylinder. Multiple flow channels communicating with the connecting pipe are formed inside the fixed cylinder and around the cooling chamber. Narrow sections are provided on the flow channels, and the narrow sections are connected to the cooling chamber through through holes.

[0007] A separator is provided with a feed pipe tangential to its side wall, and the end of the feed pipe away from the separator is connected to the other end of the fixed cylinder. An exhaust pipe is provided at the top of the separator.

[0008] As an improvement to the above technical solution, an outer sleeve is fixedly sleeved to the outside of the fixed cylinder, the outer wall of the fixed cylinder and the inner wall of the outer sleeve form a cooling area, and the outer wall of the outer sleeve is provided with a liquid inlet pipe communicating with the cooling area.

[0009] As an improvement to the above technical solution, an air inlet pipe is provided on the side wall of the cooling chamber, and a heat exchange pipe is provided inside the cooling chamber. One end of the heat exchange pipe is connected to the cooling area through a connecting pipe, and the other end of the heat exchange pipe is connected to a liquid outlet pipe. The end of the liquid outlet pipe away from the heat exchange pipe passes through the fixed cylinder and the outer sleeve in sequence and extends to the outside of the outer sleeve.

[0010] The fixed cylinder is made of thermally conductive material, and the outer sleeve is made of thermally insulating material.

[0011] As an improvement to the above technical solution, the heat exchange tube has a spiral structure.

[0012] The beneficial effects of this utility model are:

[0013] The narrow section increases the material flow rate, creating a pressure difference that prompts the cooling nitrogen in the cooling chamber to automatically enter the flow channel and exchange heat with the material. The cooling nitrogen fully contacts the material from all directions and at multiple angles, ensuring the uniformity of material cooling to a great extent. The cooled material enters the separator tangentially, forming a rotating airflow. The centrifugal force principle is used to achieve efficient separation of particulate matter and gas, ensuring effective product collection and maintaining product cleanliness. Attached Figure Description

[0014] Figure 1 This is a top sectional view of the overall structure of this utility model;

[0015] Figure 2 This is a top cross-sectional view of the cooling component of this utility model;

[0016] Figure 3 This is a side cross-sectional view of the cooling component of this utility model;

[0017] Figure 4 This is a front sectional view of the separator of this utility model.

[0018] Reference numerals: 10, separator; 11, feed pipe; 12, exhaust pipe; 20, cooling assembly; 21, fixed cylinder; 22, outer sleeve; 23, flow channel; 24, cooling chamber; 25, heat exchange tube; 251, liquid outlet pipe; 252, connecting pipe; 26, narrow section; 27, through hole; 28, connecting pipe; 29, liquid inlet pipe. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] The receiving mechanism of a chemical vapor permeation reactor includes:

[0021] Cooling component 20 includes a fixed cylinder 21 and a connecting pipe 28 connected to one end of the fixed cylinder 21. A cooling chamber 24 is coaxially formed inside the fixed cylinder 21. Multiple sets of flow channels 23 connected to the connecting pipe 28 are formed inside the fixed cylinder 21 and around the cooling chamber 24. Narrow portions 26 are provided on the flow channels 23. The narrow portions 26 are connected to the cooling chamber 24 through through holes 27.

[0022] The separator 10 has a feed pipe 11 tangential to its side wall, and one end of the feed pipe 11 away from the separator 10 is connected to the other end of the fixed cylinder 21. The top of the separator 10 is connected to an exhaust pipe 12.

[0023] Specifically, the cooling chamber 24 is filled with cooling nitrogen gas, and the connecting pipe 28 is connected to the reactor outlet pipe. After the reactor reaction is completed, all nitrogen gas input from the bottom of the reactor is turned off, and nitrogen gas is instead blown in reverse from the top of the reactor. The porous carbon support particles prepared by carbon-coated silicon are blown into the connecting pipe 28 through the outlet pipe. The particles are diverted to different flow channels 23 through the connecting pipe 28. When the material enters the flow channel 23, the flow velocity of the material will increase due to the presence of the narrow part 26. According to the principle of fluid mechanics, the increased flow velocity will lead to a decrease in pressure. At this time, the cooling nitrogen gas filling the cooling chamber 24 will... Under the pressure difference, the cooling nitrogen in the cooling chamber enters the flow channel 23 through the through hole 27. After entering the flow channel 23, the cooling nitrogen exchanges heat with the material, cooling the material. Then the material enters the feed pipe 11 and enters the separator 10 tangentially. A rotating airflow is formed in the separator 10. According to the principle of centrifugal force, the particles are thrown against the inner wall of the separator 10 and slide down along the inner wall, achieving separation from the gas. The gas moves upward with the rotating airflow and is discharged from the exhaust pipe 12 at the top of the separator 10, achieving the purpose of collecting the product.

[0024] In one embodiment, reference Figure 2 as well as Figure 3 An outer sleeve 22 is fixedly fitted to the outside of the fixed cylinder 21. The outer wall of the fixed cylinder 21 and the inner wall of the outer sleeve 22 form a cooling zone. An inlet pipe 29 communicating with the cooling zone is provided on the outer wall of the outer sleeve 22. When the cooling liquid enters the cooling zone from the inlet pipe 29, it will flow around the outer wall of the fixed cylinder 21, which can further reduce the temperature of the fixed cylinder 21, thereby indirectly cooling the flow channel and the material inside the fixed cylinder 21. Through this combination of internal and external cooling, the temperature of the material can be reduced more effectively.

[0025] In one embodiment, reference Figure 3The cooling chamber 24 has an air inlet pipe on its side wall and a heat exchange pipe 25 inside. One end of the heat exchange pipe 25 is connected to the cooling area via a connecting pipe 252, and the other end of the heat exchange pipe 25 is connected to a liquid outlet pipe 251. The end of the liquid outlet pipe 251 away from the heat exchange pipe 25 passes through the fixed cylinder 21 and the outer sleeve 22 in sequence and extends to the outside of the outer sleeve 22. Nitrogen gas is delivered into the cooling chamber 24 through the air inlet pipe. The cooling liquid flowing in the cooling area enters the heat exchange pipe 25 through the connecting pipe 252. During the flow of the cooling liquid entering the heat exchange pipe 25, it exchanges heat with the nitrogen gas in the cooling chamber 24. The heat of the nitrogen gas is transferred to the cooling liquid in the heat exchange pipe 25, causing the temperature of the cooling liquid to rise and the temperature of the nitrogen gas to drop. The cooled liquid after heat exchange is discharged through the liquid outlet pipe 251. In this way, the temperature of the nitrogen gas in the cooling chamber 24 can be reduced, thereby improving the cooling efficiency and effect on the material.

[0026] In one embodiment, the fixed cylinder 21 is made of a thermally conductive material, and the outer sleeve 22 is made of a thermally insulating material. The cooling liquid quickly carries away the heat from the outer wall of the fixed cylinder 21. The cooling liquid flows in the cooling area, continuously absorbing the heat from the outer wall of the fixed cylinder 21, reducing the temperature of the fixed cylinder 21, and thus indirectly cooling the flow channel 23 and the material inside the fixed cylinder 21, significantly enhancing the overall cooling effect. The outer sleeve 22 is made of a thermally insulating material, which can effectively prevent the heat in the cooling area from dissipating to the outside, ensuring the cooling efficiency in the cooling area.

[0027] In one embodiment, reference Figure 1 as well as Figure 2 The heat exchange tube 25 has a spiral structure. The spiral structure of the heat exchange tube 25 increases the contact area and contact time between the cooling liquid and the nitrogen in the cooling chamber 24, making the heat exchange more complete.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A take-off mechanism for a chemical vapor infiltration reactor, characterized in that, include: Cooling component (20), the cooling component (20) includes a fixed cylinder (21) and a connecting pipe (28) connected to one end of the fixed cylinder (21). A cooling chamber (24) is coaxially opened inside the fixed cylinder (21). Multiple sets of flow channels (23) connected to the connecting pipe (28) are opened inside the fixed cylinder (21) and around the cooling chamber (24). A narrow part (26) is provided on the flow channel (23). The narrow part (26) is connected to the cooling chamber (24) through a through hole (27). A separator (10) is provided with a feed pipe (11) tangential to its side wall. The end of the feed pipe (11) away from the separator (10) is connected to the other end of the fixed cylinder (21). An exhaust pipe (12) is provided at the top of the separator (10).

2. The chemical vapor infiltration reactor take-off mechanism of claim 1, wherein: The outer sleeve (22) is fixedly sleeved on the outside of the fixed cylinder (21). The outer wall of the fixed cylinder (21) and the inner wall of the outer sleeve (22) form a cooling area. The outer wall of the outer sleeve (22) is provided with a liquid inlet pipe (29) that communicates with the cooling area.

3. The chemical vapor infiltration reactor take-off mechanism of claim 2, wherein: An air inlet pipe is provided on the side wall of the cooling chamber (24), and a heat exchange pipe (25) is provided inside the cooling chamber (24). One end of the heat exchange pipe (25) is connected to the cooling area through a connecting pipe (252), and the other end of the heat exchange pipe (25) is connected to a liquid outlet pipe (251). The end of the liquid outlet pipe (251) away from the heat exchange pipe (25) passes through the fixed cylinder (21) and the outer sleeve (22) in sequence and extends to the outside of the outer sleeve (22).

4. The take-off mechanism of a chemical vapor infiltration reactor according to claim 2, characterized in that: The fixed cylinder (21) is made of thermally conductive material, and the outer sleeve (22) is made of thermally insulating material.

5. The take-off mechanism of a chemical vapor infiltration reactor according to claim 3, characterized in that: The heat exchange tube (25) has a spiral structure.

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