Sealing structure of graphite air inlet pipe and cavity
By using a combination of threads, fastening nuts, springs and annular gaskets in the sealing structure between the graphite air intake pipe and the cavity, the problem of sealing structure failure at high temperatures is solved, and effective sealing effect and long life are achieved.
Patent Information
- Application Number
- CN202422324813.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-09-23
AI Technical Summary
During the high-temperature purification of graphite, the sealing structure between the graphite air intake pipe and the cavity is difficult to maintain effective sealing at high temperatures, resulting in process gas leakage and material damage.
By providing threads and fastening nuts at the bottom end of the graphite intake pipe and an annular gasket on the spring, ensuring that the seal structure remains effectively sealed when it expands and contracts at high temperatures.
It achieves the avoidance of process gas leakage and material cracking under high temperature conditions, extends the service life of the sealing structure and improves the sealing effect.
Smart Images
Figure CN222992390U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of graphite production, in particular to a sealing structure between a graphite inlet pipe and a cavity. Background Technique
[0002] During the high-temperature purification process of graphite, process gas needs to be filled into the material area of the high-temperature furnace, and gas leakage to the outside of the material area should be avoided as much as possible to prevent corrosion of the metal structure of the equipment. Since graphite structures are usually used at high temperatures, graphite nuts and graphite gaskets are usually used to separate and seal the graphite inlet pipe and the cavity. The graphite inlet pipe and the cavity need to be kept parallel to make the sealing gasket fit tightly with the cavity, resulting in high installation and debugging difficulty. And under high-temperature working conditions, due to the different materials of the inlet pipe and the cavity, the contraction rates of the inlet pipe and the cavity are different (the graphite inlet pipe shrinks faster), which may cause potential risks of the inlet pipe being torn. Content of the Utility Model
[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a sealing structure between a graphite inlet pipe and a cavity. By setting a thread at the bottom end of the graphite inlet pipe and a fastening nut adapted to the thread, a spring is arranged on the graphite inlet pipe between the fastening nut and the bottom end of the graphite cavity, and an annular gasket is arranged at the end of the spring close to the graphite cavity to ensure that there is no leakage of process gas during expansion and that the annular gasket or the graphite inlet pipe will not be torn during contraction.
[0004] To achieve the above purpose, the utility model provides the following technical solutions:
[0005] A sealing structure between a graphite inlet pipe and a cavity, comprising a graphite inlet pipe and a graphite cavity. The graphite inlet pipe is sleeved inside the graphite cavity. The top of the graphite inlet pipe is connected to a process gas storage device. The bottom end of the graphite cavity has a through hole. The bottom end of the graphite inlet pipe extends out of the graphite cavity through the through hole. A limiting device is installed at the bottom end of the graphite inlet pipe. An elastic member is installed on the graphite inlet pipe between the limiting device and the bottom of the graphite cavity. A sealing device capable of abutting against the bottom end of the graphite cavity is installed at the top end of the elastic member.
[0006] Preferably, the limiting device is a fastening nut, and the bottom end of the graphite inlet pipe has a thread adapted to the fastening nut.
[0007] Preferably, the elastic member is a spring, and the spring is a carbon-carbon composite material.
[0008] Preferably, the sealing device is an annular gasket, and the inner ring of the annular gasket is a fillet structure.
[0009] Preferably, the annular gasket is made of carbon-carbon composite material, and the diameter of the annular gasket is larger than the diameter of the through hole at the bottom end of the graphite cavity.
[0010] Preferably, the inner diameter of the annular gasket is 0.1 mm larger than the outer diameter of the graphite inlet pipe.
[0011] Preferably, the inner diameter of the graphite cavity is larger than the outer diameter of the graphite inlet pipe.
[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0013] 1. The structure of the present utility model is simple. By setting a thread at the bottom end of the graphite inlet pipe and a fastening nut adapted to the thread, a spring is arranged on the graphite inlet pipe at the bottom end of the graphite cavity, and an annular gasket is arranged at the end of the spring close to the graphite cavity, ensuring that there is no leakage of process gas during expansion and that the annular gasket or the graphite inlet pipe will not be pulled and broken during contraction.
[0014] 2. The spring of the present device is made of carbon-carbon composite material. The mechanical properties of the carbon-carbon composite material increase rather than decrease with the increase of temperature, making it an ideal structural material in the fields of aerospace, automotive, medicine, etc. In addition, the stability and reliability of the carbon-carbon composite material in a high-temperature environment make it an ideal sealing material in the process of graphite purification, enabling the spring to be used for a long time in an inert atmosphere and having excellent chemical corrosion resistance, and being able to maintain stability and reliability under extreme working conditions.
[0015] 3. The annular gasket with a rounded corner structure of the present device can reduce the stress concentration at its corners, thereby reducing the risk of material fatigue and fracture caused by stress concentration. Moreover, the rounded corner structure makes the gasket more convenient for installation and disassembly, reduces damage to the flange sealing surface or gasket material, can also improve the wear resistance of the gasket and extend the service life of the gasket. In actual application, there will be a slight inclination between the graphite inlet pipe and the graphite cavity, and the rounded corner structure can better adapt to this inclination to ensure the sealing effect.
[0016] 4. The inner diameter of the annular gasket of the present device is 0.1 mm larger than the outer diameter of the graphite inlet pipe, which can not only ensure sufficient sealing between the graphite gasket and the graphite pipe, but also, due to the rounded corner contact between the two, allow a certain inclination angle between them, further ensuring that the annular gasket can still effectively play a sealing role when there is a slight inclination between the graphite inlet pipe and the graphite cavity. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is the overall structural schematic diagram of the original sealing structure;
[0018] Figure 2 is the overall structural schematic diagram of the present utility model;
[0019] Figure 3 is Figure 2 a partial structure enlarged view of
[0020] In the figure: 1. Graphite intake pipe; 2. Graphite cavity; 3. Annular gasket; 4. Spring; 5. Fastening nut. Specific implementation manners
[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0022] Embodiment 1
[0023] A sealing structure for a graphite intake pipe and a cavity, the structure is as Figures 1 - 3 shown, including a graphite intake pipe 1 and a graphite cavity 2. The graphite intake pipe 1 is sleeved inside the graphite cavity 2. The top of the graphite intake pipe 1 is connected to a process gas storage device. The bottom end of the graphite cavity 2 has a through hole. The bottom end of the graphite intake pipe 1 extends out of the graphite cavity 2 through the through hole. A limiting device is installed at the bottom end of the graphite intake pipe 1. An elastic member is installed on the graphite intake pipe 1 between the limiting device and the bottom of the graphite cavity 2. A sealing device capable of abutting against the bottom end of the graphite cavity 2 is installed at the top end of the elastic member.
[0024] During the high-temperature purification process of graphite, since process gas needs to be filled into the material area of the high-temperature furnace, the volume or length of the graphite cavity 2 and the graphite inlet pipe 1 will increase under high-temperature conditions. However, due to the different materials of the graphite cavity 2 and the graphite inlet pipe 1, the expansion rates of the graphite cavity 2 and the graphite inlet pipe 1 are different. Under high-temperature conditions, the expansion rate of the graphite inlet pipe 1 is greater than that of the graphite cavity 2. The length of the graphite inlet pipe 1 will increase. Originally, the annular gasket 3 at the bottom end of the graphite inlet pipe 1 abuts against the bottom end of the graphite cavity 2. When the length of the graphite inlet pipe 1 increases, the annular gasket 3 will follow the increase in the length of the graphite inlet pipe 1 and move away from the graphite cavity 2, resulting in a decrease in the sealing performance of the annular gasket 3 for the graphite cavity 2. The process gas will leak outside the material area, causing corrosion to the metal structure of the equipment. By installing a limiting device at the bottom end of the graphite inlet pipe 1 and installing an elastic member at the lower end of the graphite inlet pipe 1, ensuring that the elastic member is located between the limiting device and the graphite cavity 2, and then installing a sealing device at the end of the elastic member close to the graphite cavity 2, ensuring that the sealing device abuts against the bottom end of the graphite cavity 2. Under high-temperature conditions, the length of the graphite inlet pipe 1 will still increase, driving the limiting device away from the bottom end of the graphite cavity 2. However, under the action of the elastic device, it is ensured that the sealing device can always abut against the bottom end of the graphite cavity 2, ensuring the sealing performance of the device under high-temperature conditions, preventing the process gas from leaking outside the material area and causing corrosion to the metal structure of the equipment, and ensuring the service life of the device.
[0025] The limiting device is a fastening nut 5, and the bottom end of the graphite inlet pipe 1 has a thread adapted to the fastening nut 5.
[0026] By providing a thread at the bottom end of the graphite inlet pipe 1, it is convenient to install the fastening nut 5 at the bottom end of the graphite inlet pipe 1, facilitating the operator to quickly install the fastening nut 5. At the same time, it is convenient for quick disassembly, facilitating the adjustment or maintenance of the elastic member and the sealing device.
[0027] The elastic member is a spring 4, and the spring 4 is made of carbon-carbon composite material.
[0028] The mechanical properties of the carbon-carbon composite material increase rather than decrease with the increase in temperature, making it an ideal structural material in the fields of aerospace, automotive, medicine, etc. In addition, the stability and reliability of the carbon-carbon composite material in a high-temperature environment make it an ideal sealing material in the process of graphite purification, enabling the spring 4 to be used for a long time in an inert atmosphere and having excellent chemical corrosion resistance, and being able to maintain stability and reliability under extreme working conditions.
[0029] The sealing device is an annular gasket 3, and the inner ring of the annular gasket 3 is a rounded corner structure.
[0030] The rounded corner structure can reduce the stress concentration at the corners of the gasket, thereby reducing the risk of material fatigue and fracture caused by stress concentration. Moreover, the rounded corner structure makes the installation and disassembly of the gasket more convenient, reduces the damage to the flange sealing surface or gasket material, and can also improve the wear resistance of the gasket and extend its service life. In actual applications, there will be a slight inclination between the graphite inlet pipe 1 and the graphite cavity 2, and the rounded corner structure can better adapt to this inclination to ensure the sealing effect.
[0031] The annular gasket 3 is made of carbon-carbon composite material, and the diameter of the annular gasket 3 is larger than the diameter of the bottom through hole of the graphite cavity 2. The inner diameter of the annular gasket 3 is 0.1 mm larger than the outer diameter of the graphite inlet pipe 1.
[0032] The carbon-carbon composite annular gasket 3 can not only ensure the sealing performance with its chemical corrosion resistance, but also maintain stability and reliability under extreme working conditions. The diameter of the annular gasket 3 being larger than the diameter of the bottom through hole of the graphite cavity 2 can ensure the sealing performance of the annular gasket 3. The inner circle of the annular gasket 3 is processed into a rounded corner shape, and its inner diameter is 0.1 mm larger than the outer diameter of the graphite inlet pipe 1. This can not only ensure sufficient sealing between the graphite gasket and the graphite pipe, but also, due to the rounded corner contact between the two, allow a certain inclination angle between them, further ensuring that when there is a slight inclination between the graphite inlet pipe 1 and the graphite cavity 2, the annular gasket 3 can still effectively achieve the sealing effect.
[0033] The inner diameter of the graphite cavity 2 is larger than the outer diameter of the graphite inlet pipe 1.
[0034] The cavity between the inner wall of the graphite cavity 2 and the outer wall of the graphite inlet pipe 1 can be evacuated by an external vacuum pumping device to form a heat insulation layer, preventing the high-temperature heat in the high-temperature furnace from being dissipated to the outside here, reducing heat loss and improving the thermal efficiency of the furnace.
[0035] Embodiment 2
[0036] On the basis of Embodiment 1, after the high-temperature purification of graphite is completed, due to the temperature drop in the high-temperature furnace, the volume or length of the graphite cavity 2 and the graphite inlet pipe 1 will become smaller when cooled. However, due to the different materials of the graphite cavity 2 and the graphite inlet pipe 1, the contraction rates of the graphite cavity 2 and the graphite inlet pipe 1 are different. When cooled, the contraction rate of the graphite inlet pipe 1 is greater than that of the graphite cavity 2. The length of the graphite inlet pipe 1 will contract faster relative to the graphite cavity 2. Originally, the annular gasket 3 at the bottom end of the graphite inlet pipe 1 abuts against the bottom end of the graphite cavity 2. When the length of the graphite inlet pipe 1 contracts, the annular gasket 3 will follow the contraction of the length of the graphite inlet pipe 1. When the graphite cavity 2 contracts slowly and the graphite inlet pipe 1 contracts quickly, it will cause the pressure of the annular gasket 3 on the graphite cavity 2 to gradually increase. The original annular gasket 3 is fixedly connected to the graphite inlet pipe 1. When the pressure increases, the annular gasket 3 may cause the graphite inlet pipe 1 or the annular gasket 3 to have a risk of fracture, affecting the subsequent high-temperature purification work. The improved utility model can transfer the original pressure between the annular gasket 3 and the bottom of the graphite cavity 2 to the spring 4 when the graphite cavity 2 and the graphite inlet pipe 1 are cooled, effectively avoiding the graphite inlet pipe 1 or the annular gasket 3 from being pulled apart and ensuring the service life of the device.
[0037] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes, increases or decreases, or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present utility model should be covered by the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.
Claims
1. A sealing structure of a graphite air inlet pipe and a cavity, comprising a graphite air inlet pipe (1) and a graphite cavity (2), wherein the graphite air inlet pipe (1) is sleeved inside the graphite cavity (2), and the top of the graphite air inlet pipe (1) is connected to a process gas storage device, characterized in that: The bottom end of the graphite cavity (2) has a through hole, and the bottom end of the graphite air inlet pipe (1) extends out of the graphite cavity (2) through the through hole. A limiting device is installed at the bottom end of the graphite air inlet pipe (1), and an elastic member is installed on the graphite air inlet pipe (1) between the limiting device and the bottom of the graphite cavity (2). The top end of the elastic member is installed with a sealing device capable of abutting against the bottom end of the graphite cavity (2).
2. The sealing structure of a graphite air inlet pipe and a cavity according to claim 1, characterized in that: The limiting device is a fastening nut (5), and the bottom end of the graphite air inlet pipe (1) has a thread that matches the fastening nut (5).
3. The sealing structure of a graphite air inlet pipe and a cavity according to claim 1, characterized in that: The elastic member is a spring (4), and the spring (4) is a carbon-carbon composite material.
4. The sealing structure of a graphite air inlet pipe and a cavity according to claim 1, characterized in that: The sealing device is an annular gasket (3), and the inner ring of the annular gasket (3) is a rounded structure.
5. The sealing structure of a graphite air inlet pipe and a cavity according to claim 4, characterized in that: The annular gasket (3) is a carbon-carbon composite material, and the diameter of the annular gasket (3) is greater than the diameter of the through hole at the bottom end of the graphite cavity (2).
6. The sealing structure of a graphite air inlet pipe and a cavity according to claim 5, characterized in that: The inner ring diameter of the annular gasket (3) is 0.1 mm larger than the outer diameter of the graphite air inlet pipe (1).
7. The sealing structure of a graphite air inlet pipe and a cavity according to claim 1, characterized in that: The inner diameter of the graphite cavity (2) is greater than the outer diameter of the graphite air inlet pipe (1).