Ventilation device for a graphitization furnace

Abstract

The utility model discloses a kind of ventilation devices of graphitization furnace, it is related to ventilation device technical field, including pipe body, the inside of pipe body is provided with airflow passage through pipe body, the equal-interval air hole of array is on the outer wall of pipe body, the air hole and airflow passage are communicated, the both ends of airflow passage are provided with ladder groove, the sleeve pipe is sleeved in the ladder groove, the sleeve pipe in one is equipped with screw plug, another sleeve pipe is connected with the ventilation pipe of outside. The utility model discloses a kind of ventilation devices of graphitization furnace, pipe body is made of high purity graphite, high purity graphite has very high melting point and thermal stability, can withstand the extreme high temperature required in graphitization process, improves the stability of gas supply pipeline when graphitization furnace is used, simultaneously, can help evenly distribute heat, ensure the consistency of temperature in furnace, improves the quality of production.

Description

Technical Field

[0001] This utility model relates to the field of ventilation device technology, and more specifically to a ventilation device for a graphitization furnace. Background Technology

[0002] A graphitization furnace is a high-temperature device used to convert carbon materials into graphite structures. During graphitization, the carbon material is treated at high temperatures (typically above 2500°C) to remove impurities and restructure its atomic structure, forming the layered crystal structure unique to graphite. To ensure the smooth progress of the graphitization process, the furnace is usually equipped with a ventilation system. In production, graphite tubes are pre-embedded in the bottom of the furnace as a ventilation system. During the later stages of graphitization, reactive gases such as Freon and chlorine are introduced into the furnace through these tubes. These gases react with impurities, vaporizing and expelling them, thus purifying the product.

[0003] Chinese patent application number 201520264536.4 discloses a bottom pipe structure for a graphitization furnace. The structure includes a pipe body composed of a ventilation pipe and a metal pipe. The ventilation pipe consists of two pipes, Pipe 1 and Pipe 2, connected together. Both Pipe 1 and Pipe 2 are made of graphite. The diameter of Pipe 2 is smaller than that of Pipe 1, and the diameter of the metal pipe is smaller than that of Pipe 2. The metal pipe is also connected to Pipe 2. This bottom pipe structure for a graphitization furnace addresses the issue of the graphite pipe cracking due to thermal expansion of the metal connecting pipe during production. However, the following problems still exist:

[0004] 1. Setting an intermediate pipe between the metal pipe and the graphite pipe will undoubtedly increase the length of the entire gas supply system and the gas flow time. Moreover, when the metal pipe expands, the intermediate pipe may burst, which will also increase production costs.

[0005] 2. The airflow channels inside the graphite pipes are usually continuous. When the graphitization furnace is too large, multiple graphite pipes can be connected at the other end. The graphite pipes at the end are sealed with screw plugs. However, since the screws are made of metal, they can also expand. If the method of adding intermediate pipes is also used, when the expansion of the screw plugs causes the central pipe to crack, the replacement of the central pipe will be very troublesome. Utility Model Content

[0006] To address the above problems, this utility model provides a ventilation device for a graphitization furnace; it improves the stability of the gas supply pipeline, and the sleeves at both ends can adapt to the metal expansion of the sleeves and ventilation pipes, thus preventing the ends from cracking.

[0007] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0008] A ventilation device for a graphitization furnace includes a pipe body with an airflow channel running through the inside of the pipe body. The outer wall of the pipe body has an array of equally spaced air holes connected to the airflow channel. Stepped grooves are provided at both ends of the airflow channel, and sleeves are fitted inside the stepped grooves. A screw plug is installed in one of the sleeves, and the other sleeve is connected to an external ventilation pipe.

[0009] The sleeve includes a positioning plate, an outer ring, and an inner ring. The outer ring is fitted over the inner ring, and a curved portion connects the outer ring and the inner ring. One end of the outer ring near the curved portion is connected to the positioning plate. The inner ring is divided into segments, and the inner surface of the inner ring is provided with internal threads. The screw plug is installed on the inner ring by the threads.

[0010] Preferably, a fixing groove is provided in the stepped groove, a fixing block is provided on the outer ring surface of the inner ring and inserted into the fixing groove, and a square hole is provided on the outer ring for the fixing block to pass through.

[0011] Preferably, one end of the stepped groove is provided with a groove, the diameter of which is larger than the outer ring surface of the positioning plate and the screw plug.

[0012] Preferably, the groove is provided with a first toothed surface, and the positioning plate is provided with a second toothed surface that cooperates with the first toothed surface at one end near the tube body.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. The tube body of this device is made of high-purity graphite. High-purity graphite has a very high melting point and thermal stability, which can withstand the extreme high temperatures required in the graphitization process, usually above 2000℃. This improves the stability of the gas supply pipeline when the graphitization furnace is in use. At the same time, it can help to distribute heat evenly and ensure the consistency of the furnace temperature. This is crucial for material quality control in the graphitization process and improves the quality of production.

[0015] 2. This device has sleeves at both ends of the tube, which can be used to connect the metal plug and the vent pipe. The change in the distance between the inner and outer rings can accommodate the expansion of the metal, avoiding the situation where the two ends of the tube are cracked due to expansion, and improving the service life of the tube made of high-purity graphite. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the tube structure of this utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the tube body in this utility model;

[0018] Figure 3 This is a schematic diagram of the tube body and screw plug structure of this utility model;

[0019] Figure 4 This is a cross-sectional view of the tube body and screw plug structure of this utility model;

[0020] Figure 5 This is an exploded view of the tube body and sleeve structure of this utility model;

[0021] Figure 6 This is a cross-sectional view of the sleeve structure in this utility model.

[0022] Figure label:

[0023] 101. Tube body; 102. Airflow channel; 103. Air hole; 104. Sleeve; 105. Plug; 106. Positioning plate; 107. Outer ring; 108. Inner ring; 109. Bend; 110. Fixing groove; 111. Fixing block; 112. First tooth surface; 113. Second tooth surface. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-6 A ventilation device for a graphitization furnace includes a tube body 101 made of high-purity graphite. The tube body 101 has evenly distributed pores 103 for introducing reactive gases such as Freon and chlorine into the furnace chamber to purify the product. An airflow channel 102 is formed inside the tube body 101, and evenly spaced pores 103 are arrayed on the outer wall of the tube body 101. The pores 103 are connected to the airflow channel 102, and stepped grooves are formed at both ends of the airflow channel 102. The stepped groove is used to place the sleeve 104. The inside of the sleeve 104 is connected to the screw plug 105 or a metal gas supply pipe through threads. The sleeve 104 is installed in the stepped groove. One of the sleeves 104 is equipped with a screw plug 105, and the other sleeve 104 is connected to the external vent pipe. One end of the tube body 101 is threaded to the vent pipe through the sleeve 104, and the other end is threaded to the screw plug 105 through the sleeve 104. The external active gas is introduced into the furnace through the vent pipe.

[0026] Because the expansion rate of the metal vent pipe and sleeve 104 is greater than that of graphite, the two ends of the pipe body 101 may crack due to expansion. The following is a structure to accommodate metal expansion: [Reference] Figures 4 to 6The sleeve 104 includes a positioning plate 106, an outer ring 107, and an inner ring 108. There is a certain space between the inner ring 108 and the outer ring 107 to accommodate metal expansion. The outer ring 107 is fitted over the inner ring 108. A bend 109 connects the outer ring 107 and the inner ring 108. When the vent pipe or plug 105 is not installed inside the sleeve 104, the multi-lobed inner ring 108 is tilted relative to the axis. When the vent pipe or plug 105 is installed by threads, the inner ring 108 moves closer to the outer ring 107, thus... The outer ring 107 is parallel to the inner ring 108, and the inner ring 108 is split. The inner surface of the inner ring 108 is provided with internal threads, which can be used to install the vent pipe and the screw plug 105 into the sleeve 104 through threaded connection. The screw plug 105 is installed on the inner ring 108 through threads. The sleeve 104 is made of metal. Although it will expand, it can adapt to the expansion by changing the gap between the outer ring 107 and the inner ring 108.

[0027] Specifically, refer to Figure 5 and Figure 6 A fixing groove 110 is provided in the stepped groove. The depth of the fixing groove 110 is greater than the length of the fixing block 111. When the fixing block 111 is inserted into the fixing groove 110, it will fix the sleeve 104. The outer ring surface of the inner ring 108 is provided with a fixing block 111 that is inserted into the fixing groove 110. The outer ring 107 is provided with a square hole through which the fixing block 111 passes. When the vent pipe or screw plug 105 is not inserted, the inner ring 108 is oriented towards the axis, so that the fixing block 111 does not pass through the square hole on the outer ring 107. When the vent pipe or screw plug 105 is installed, it will drive the fixing block 111 to pass through the square hole and insert into the fixing groove 110. When the vent pipe or screw plug 105 is heated and expands, the distance between the inner ring 108 and the outer ring 107 will become smaller, and the fixing block 111 will extend further into the fixing groove 110.

[0028] Specifically, refer to Figure 4 One end of the stepped groove is provided with a groove. The diameter of the groove is larger than the outer ring surface of the positioning plate 106 and the screw plug 105. When the edge of the screw plug 105 expands, the groove will not come into contact with it to accommodate its expansion.

[0029] Specifically, refer to Figures 4 to 6The groove is provided with a first toothed surface 112. The outer ring surface of the outer ring 107 is smaller than the inner ring surface of the stepped groove, which makes it easier to install the sleeve 104 into the tube body 101. When the sleeve 104 is installed into the stepped groove, the first toothed surface 112 on the sleeve 104 will mesh with the second toothed surface 113, thereby fixing the sleeve 104 and preventing the sleeve 104 from rotating when installing the vent pipe or the screw plug 105. The positioning plate 106 has a second toothed surface 113 that cooperates with the first toothed surface 112 at one end near the tube body 101.

[0030] In this embodiment, stepped grooves are provided at both ends of the tube body 101 for installing the sleeve 104. The screw plug 105 and the vent pipe are installed through the sleeve 104. The vent pipe is connected to an external gas source, which can introduce active gases such as Freon and chlorine into the furnace through the tube body 101 to improve the purity of the product.

[0031] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A venting device of a graphitization furnace comprising a tubular body (101), characterized in that: The tube body (101) has an airflow channel (102) that runs through it. The outer wall of the tube body (101) has an array of equally spaced air holes (103). The air holes (103) are connected to the airflow channel (102). The two ends of the airflow channel (102) have stepped grooves. A sleeve (104) is fitted inside the stepped groove. One of the sleeves (104) is fitted with a screw plug (105), and the other sleeve (104) is connected to an external vent pipe. The sleeve (104) includes a positioning plate (106), an outer ring (107) and an inner ring (108). The outer ring (107) is fitted over the inner ring (108). A bend (109) connects the outer ring (107) and the inner ring (108). One end of the outer ring (107) near the bend (109) is connected to the positioning plate (106). The inner ring (108) is divided into segments. The inner surface of the inner ring (108) is provided with an internal thread. The screw plug (105) is installed on the inner ring (108) by the thread.

2. A gas distribution device for a graphitization furnace as defined in claim 1, characterized in that: A fixing groove (110) is provided in the stepped groove, and a fixing block (111) is provided on the outer ring surface of the inner ring (108) and inserted into the fixing groove (110). A square hole is provided on the outer ring (107) for the fixing block (111) to pass through.

3. A gas distribution device for a graphitization furnace as defined in claim 2, characterized in that: One end of the stepped groove is provided with a groove, the diameter of which is larger than the outer ring surface of the positioning plate (106) and the screw plug (105).

4. A gas distribution device for a graphitization furnace as defined in claim 3, characterized in that: The groove is provided with a first toothed surface (112), and the positioning plate (106) is provided with a second toothed surface (113) that cooperates with the first toothed surface (112) at one end near the tube body (101).

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