Furnace mouth sealing and gas diversion device

Abstract

The present invention relates to the technical field of carbon fiber preparation, and in particular to a furnace mouth sealing and gas guide device, comprising: a mounting frame is arranged at the end of a furnace body, and a first air sealing mechanism is detachably mounted in the mounting frame; a second air sealing mechanism is arranged below the first air sealing mechanism, and a wire-passing passage for yarn to pass through is formed between the second air sealing mechanism and the first air sealing mechanism; the first air sealing mechanism is composed of a plurality of air sealing boxes arranged in parallel, and a diverter hole with a mesh structure is provided on the side facing the air inlet hood, and a first air sealing hole group is provided on the side facing the wire-passing passage, and a second air sealing hole group is provided on the side facing the wire-passing passage, so that the blown airflow forms an air curtain in the wire-passing passage. The modular design of the plurality of air sealing boxes is convenient for disassembly and replacement, and the diverter hole can make the airflow entering the wire-passing passage more stable, thereby forming a relatively stable airflow in the furnace mouth area, avoiding the phenomenon of hair on the surface of the carbon fiber, and effectively ensuring the molding quality of the carbon fiber.

Description

Technical Field

[0001] The invention relates to the technical field of carbon fiber preparation, and in particular to a furnace mouth sealing and gas guiding device. Background Art

[0002] In the process of converting the precursor into carbon fiber yarn, in order to ensure the quality of the carbon fiber, the carbon fiber raw material needs to be oxidized. The pre-oxidation step is usually achieved through an oxidation furnace, which passes the precursor through the oxidation chamber of the oxidation furnace, blows hot air from one end of the oxidation chamber, and then makes the hot air flow to the other end. The hot air sweeps the precursor during the flow, thereby achieving the pre-oxidation process of the precursor. Since some harmful substances will be generated during the oxidation process, in order to prevent gas leakage in the pre-oxidation furnace, it is necessary to set a gas sealing structure at the furnace body opening at both ends of the pre-oxidation furnace where the pre-oxidized wire passes.

[0003] In the prior art, two air seals are usually used at the end of the pre-oxidation furnace to prevent the exhaust gas from overflowing. That is, an air duct near the end of the pre-oxidation furnace is perpendicular to the wire running direction of the raw wire in the pre-oxidation furnace, so that the wind circulating in the pre-oxidation furnace is blocked by the air curtain.

[0004] However, the above-mentioned air sealing structures are arranged one by one on the side walls of the pre-oxidation furnace. When the air sealing structures need to be repaired or replaced, the entire pre-oxidation furnace needs to be disassembled, which increases the equipment downtime and maintenance costs. The uneven air flow of the air sealing will cause the surface of the carbon fiber to be rubbed and produce hair, affecting the molding quality of the carbon fiber. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a furnace mouth sealing and gas flow guiding device to effectively solve the problems in the background technology.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: a furnace mouth sealing and gas flow guiding device, comprising:

[0007] The mounting frame is arranged at the end of the furnace body, and a first through cavity connected to the furnace body is formed inside the mounting frame along the wire running direction, and a second through cavity connected to the upper air inlet hood is formed perpendicular to the wire running plane;

[0008] A first air sealing mechanism is detachably mounted in the mounting frame along the wire running direction;

[0009] A second air sealing mechanism is arranged below the first air sealing mechanism, and forms a wire passage for the yarn to pass through with the first air sealing mechanism, and a lower air inlet hood is arranged on a side away from the wire passage;

[0010] Among them, the first air sealing mechanism is composed of a plurality of air sealing boxes arranged in parallel, and the plurality of air sealing boxes are provided with diversion holes in a mesh structure for gas to pass through on one side facing the upper air intake hood, and a first air sealing hole group is provided on the side facing the wire feeding channel, and the second air sealing mechanism is provided with a second air sealing hole group on the side facing the wire feeding channel, and the airflows blown out from the first air sealing hole group and the second air sealing hole group form an air curtain in the wire feeding channel.

[0011] Furthermore, a partition plate is provided between two adjacent air sealing boxes, and the installation frame forms an air flow channel corresponding to the air sealing boxes one by one through the partition plate.

[0012] Furthermore, the gas sealing box is open on one side facing the furnace body, and a first diverter plate is provided in the gas sealing box along a direction parallel to the length of the installation frame to form a gas sealing area and a guide area in the gas sealing box;

[0013] The gas sealing area is communicated with the wire-feeding channel through the first gas sealing hole group, and the flow guide area is communicated with the interior of the furnace body.

[0014] Furthermore, the first diverter plate includes a vertical plate arranged in a vertical direction, and a guide plate arranged obliquely toward the furnace body;

[0015] In the flow region where the air seal area is located, the flow cross section of the vertical plate is smaller than the flow cross section of the guide plate.

[0016] Furthermore, a flow equalizing plate is provided on one side of the opening structure of the installation frame located at the air sealing box.

[0017] Furthermore, the upper air intake hood includes an air intake cavity having an arched structure along the length direction of the mounting frame, and an air inlet disposed in the middle of the air intake cavity;

[0018] Furthermore, a projection of the edge of the air inlet cavity in the vertical direction exceeds a diversion area formed by a plurality of the diversion holes on the plurality of air sealing boxes.

[0019] Furthermore, the second air sealing mechanism comprises a support frame, and positioning edges formed by extending the two ends of the support frame upwards perpendicular to the wire running direction;

[0020] The first air sealing mechanism is arranged on the two positioning edges to form the wire-traveling channel;

[0021] A second diverter plate is disposed in an open cavity of the support frame away from the wire-feeding channel, and the second diverter plate is symmetrically disposed with respect to the wire-feeding channel and the first diverter plate.

[0022] Furthermore, the lower air intake hood has a conical structure;

[0023] Furthermore, the air inlet cross-section of the lower air inlet hood and the air inlet cross-section of the second diverter plate gradually increase toward the wire feeding channel.

[0024] Furthermore, the first air-sealing hole group and the second air-sealing hole group include a plurality of long holes cross-distributed in multiple rows along the wire running direction.

[0025] Furthermore, the axes of the plurality of the elongated holes in the first gas sealing hole group and the second gas sealing hole group are arranged to be inclined toward the furnace body.

[0026] The beneficial effects of the present invention are as follows: the modular design of multiple air sealing boxes in the present invention facilitates disassembly and replacement, and facilitates the installation and maintenance of the equipment. The diversion holes can make the airflow entering the wire feeding channel more stable, thereby forming a relatively stable airflow in the furnace mouth area, ensuring the balance of the airflow temperature field and flow field in the furnace, avoiding the phenomenon of fuzz on the surface of the carbon fiber, and effectively ensuring the molding quality of the carbon fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is an axonometric schematic diagram of a furnace mouth sealing and gas flow guiding device in an embodiment of the present invention;

[0029] Figure 2 It is a front view of the furnace mouth sealing and gas guide device in the embodiment of the present invention;

[0030] Figure 3 for Figure 2 AA section view;

[0031] Figure 4 Schematic diagram of the furnace mouth sealing and gas flow guiding device in the embodiment of the present invention;

[0032] Figure 5 is a first exploded schematic diagram of a first air sealing mechanism in an embodiment of the present invention;

[0033] Figure 6 is a second exploded schematic diagram of the first air sealing mechanism in an embodiment of the present invention;

[0034] Figure 7 It is a schematic diagram of the structure of the gas sealing box in an embodiment of the present invention;

[0035] Figure 8 for Figure 3A partial enlarged view of point B.

[0036] Figure numerals: 1. Installation frame; 11. First through cavity; 12. Second through cavity; 13. Partition plate; 14. Flow equalizing plate; 2. First air-sealing mechanism; 21. Air-sealing box; 211. Diverter hole; 212. First air-sealing hole group; 213. First diverter plate; 21a. Air-sealing area; 21b. Guide area; 3. Second air-sealing mechanism; 31. Support frame; 311. Positioning edge; 312. Second air-sealing hole group; 313. Second diverter plate; 4. Wire feeding channel; 5. Upper air intake hood; 6. Lower air intake hood. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0038] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0040] like Figures 1 to 8 The furnace mouth sealing and gas guide device shown includes:

[0041] The mounting frame 1 is arranged at the end of the furnace body, and a first through cavity 11 connected to the furnace body is formed inside the mounting frame 1 along the wire running direction, and a second through cavity 12 connected to the upper air inlet hood 5 is formed perpendicular to the wire running plane;

[0042] A first air sealing mechanism 2 is detachably mounted in the mounting frame 1 along the wire feeding direction;

[0043] The second air sealing mechanism 3 is arranged below the first air sealing mechanism 2, and forms a wire passage 4 for the yarn to pass through between the second air sealing mechanism 3 and the first air sealing mechanism 2, and a lower air inlet hood 6 is arranged on a side away from the wire passage 4;

[0044] Among them, the first air sealing mechanism 2 is composed of a plurality of air sealing boxes 21 arranged in parallel, and the plurality of air sealing boxes 21 are provided with a mesh-structured diversion hole 211 for gas to pass through on one side facing the upward air intake hood 5, and a first air sealing hole group 212 is provided on the side facing the wire feeding channel 4, and the second air sealing mechanism 3 is provided with a second air sealing hole group 312 on the side facing the wire feeding channel 4, and the airflow blown out from the first air sealing hole group 212 and the second air sealing hole group 312 forms an air curtain in the wire feeding channel 4.

[0045] In the preferred embodiment of the present invention, the fresh air enters the upper air intake hood 5 and the lower air intake hood 6 after heating, and the gas entering the upper hood enters the multiple air sealing boxes 21 through the diverter holes 211 of the mesh structure, and the lower air intake hood 6 enters the second air sealing mechanism 3, and the airflow blown out through the first air sealing hole group 212 and the second air sealing hole group 312 forms an air curtain in the wire feeding channel 4, which can prevent the exhaust gas in the furnace from overflowing and block the entry of cold air outside the furnace. The modular design of the multiple air sealing boxes 21 in the present invention is convenient for disassembly and replacement, and convenient for the installation and maintenance of the equipment, and the diverter holes 211 can make the airflow entering the wire feeding channel 4 more stable, thereby forming a relatively stable airflow in the furnace mouth area, ensuring the balance of the airflow temperature field and flow field in the furnace, avoiding the phenomenon of fuzz on the surface of the carbon fiber, and effectively ensuring the molding quality of the carbon fiber.

[0046] In a preferred embodiment of the present invention, a partition plate 13 is provided between two adjacent air-sealing boxes 21. The mounting frame 1 forms an air flow channel corresponding to the air-sealing boxes 21 through the partition plate 13. The partition plate 13 forms a separate air flow channel between each air-sealing box 21, thereby effectively preventing cross-flow of gas and improving the sealing performance. Furthermore, since there is a separate air flow channel between each air-sealing box 21, it is convenient to disassemble and replace the air-sealing boxes 21 separately, thereby effectively improving production efficiency.

[0047] In the present invention, the air sealing box 21 is open on the side facing the furnace body, and a first diverter plate 213 is provided in the air sealing box 21 along a length direction parallel to the mounting frame 1 to form an air sealing area 21a and a guide area 21b in the air sealing box 21; the air sealing area 21a is connected to the wire feeding channel 4 through the first air sealing hole group 212, and the guide area 21b is connected to the inside of the furnace body.

[0048] In the present invention, the first diverter plate 213 is arranged in the air seal box 21, so that part of the air flow entering the air seal box 21 is introduced into the air seal area 21a, and the other part is introduced into the guide area 21b, which increases the stability of the air flow. The air flow in the air seal area 21a forms an air curtain in the wire feeding channel 4 to improve the sealing performance. The air flow in the guide area 21b will enter the furnace body, accelerate the gas flow in the furnace, and make the gas distribution in the furnace body more uniform.

[0049] As a preferred embodiment of the above embodiment, the first diverter plate 213 includes a vertical plate arranged in the vertical direction, and a guide plate arranged obliquely toward the furnace body; the flow cross-section of the vertical plate in the flow area where the gas sealing area 21a is located is smaller than the flow cross-section of the guide plate. The variable cross-section setting of the gas sealing area 21a increases the flow speed of the airflow in the gas sealing area 21a, thereby ensuring the stability of the air curtain in the wire feeding channel 4, and the furnace body is in a slightly negative pressure state. When the upper and lower airflows meet to form an air curtain, a part of the gas will enter the furnace, thereby increasing the sealing of the air curtain to the furnace mouth.

[0050] In order to ensure the uniformity of the airflow entering the furnace from the gas seal box 21, based on the above embodiment, a flow equalizer 14 is provided on one side of the opening structure of the installation frame 1 located at the gas seal box 21. A plurality of flow equalizer holes are evenly arranged on the flow equalizer 14, and the airflow is dispersed after passing through the plurality of flow equalizer holes, so that the flow velocity and pressure of the airflow entering the furnace body are more uniform.

[0051] In the preferred embodiment of the present invention, the upper air intake hood 5 includes an air intake cavity with an arched structure along the length direction of the mounting frame 1, and an air inlet arranged in the middle of the air intake cavity; when the gas enters the air intake cavity through the air inlet, the flow section of the air intake cavity gradually increases along the direction away from the air inlet, so that the gas is accelerated once through the air intake cavity, and a part of the gas enters the air sealing area 21a, and the other part enters the guide area 21b. The gas entering the air sealing area 21a is accelerated twice after passing through the variable diameter flow section formed by the guide plate, thereby further increasing the flow speed, and the projection of the edge of the air intake cavity in the vertical direction exceeds the diversion area formed by the multiple diversion holes 211 on the multiple air sealing boxes 21. As a result, the air outlet of the air intake cavity fully covers the air inlets of the multiple air sealing boxes 21, avoiding the generation of dead angles, thereby ensuring the stability and sealing of the air curtain in the wire feeding channel 4.

[0052] In a preferred embodiment of the present invention, the second air sealing mechanism 3 includes a support frame 31, and a positioning edge 311 formed by extending the two ends of the support frame 31 upward perpendicular to the wire feeding direction; the first air sealing mechanism 2 is arranged on the two positioning edges 311 to form a wire feeding channel 4; a second diverter plate 313 is provided in the open cavity of the support frame 31 away from the wire feeding channel 4, and the second diverter plate 313 is symmetrically arranged with respect to the wire feeding channel 4 and the first diverter plate 213 to ensure the stability of the airflow above and below the carbon fiber filaments.

[0053] As a preferred embodiment of the above embodiment, the lower air inlet hood 6 has a conical structure; and the air inlet cross-section of the lower air inlet hood 6 and the air inlet cross-section of the second diverter plate 313 gradually increase toward the wire feeding channel 4, which can reduce the resistance of the airflow during passage and increase the airflow speed, and the second air sealing hole group 312 can further optimize the airflow distribution, so that the gas distributed in the wire feeding channel 4 is more evenly distributed.

[0054] The first gas sealing hole group 212 and the second gas sealing hole group 312 include multiple rows of cross-distributed long holes along the wire feeding direction. Specifically, the long holes increase the ventilation surface, promote the convection of the gas, and the cross-distribution form optimizes the air flow distribution, forming a more uniform and stable air curtain, and increasing the air sealing effect.

[0055] As a preferred embodiment of the above, the axes of several long holes in the first gas sealing hole group 212 and the second gas sealing hole group 312 are inclined toward the furnace body, which can increase the coverage of the gas curtain in the wire feeding channel 4 and further improve the gas sealing effect.

[0056] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A furnace mouth sealing and gas diversion device, characterized in that: include: The mounting frame is arranged at the end of the furnace body, and a first through cavity connected to the furnace body is formed inside the mounting frame along the wire running direction, and a second through cavity connected to the upper air inlet hood is formed perpendicular to the wire running plane; A first air sealing mechanism is detachably mounted in the mounting frame along the wire running direction; A second air sealing mechanism is arranged below the first air sealing mechanism, and forms a wire passage for the yarn to pass through with the first air sealing mechanism, and a lower air inlet hood is arranged on a side away from the wire passage; Wherein, the first air sealing mechanism is composed of a plurality of air sealing boxes arranged in parallel, and the plurality of air sealing boxes are provided with a mesh-shaped diversion hole for gas to pass through on one side facing the upper air inlet hood, and a first air sealing hole group is provided on the side facing the wire-travelling passage, and the second air sealing mechanism is provided with a second air sealing hole group on the side facing the wire-travelling passage, and the airflows blown out of the first air sealing hole group and the second air sealing hole group form an air curtain in the wire-travelling passage; The gas sealing box is open on one side facing the furnace body, and a first diverter plate is provided in the gas sealing box along a direction parallel to the length of the installation frame to form a gas sealing area and a guide area in the gas sealing box; The gas sealing area is communicated with the wire-feeding channel through the first gas sealing hole group, and the flow guide area is communicated with the interior of the furnace body.

2. The furnace mouth sealing and gas guiding device according to claim 1, characterized in that: A partition plate is provided between two adjacent air sealing boxes, and the installation frame forms an air flow channel corresponding to the air sealing boxes one by one through the partition plate.

3. The furnace mouth sealing and gas flow guiding device according to claim 1, characterized in that: The first diverter plate includes a vertical plate arranged in a vertical direction, and a guide plate arranged obliquely toward the furnace body; In the flow region where the air seal area is located, the flow cross section of the vertical plate is smaller than the flow cross section of the guide plate.

4. The furnace mouth sealing and gas guiding device according to claim 1, characterized in that: The installation frame is provided with a flow equalizing plate on one side of the opening structure of the air sealing box.

5. The furnace mouth sealing and gas guiding device according to claim 3, characterized in that: The upper air inlet hood comprises an air inlet cavity with an arched structure along the length direction of the mounting frame, and an air inlet arranged in the middle of the air inlet cavity; Furthermore, a projection of the edge of the air inlet cavity in the vertical direction exceeds a diversion area formed by a plurality of the diversion holes on the plurality of air sealing boxes.

6. The furnace mouth sealing and gas guiding device according to claim 1, characterized in that: The second air sealing mechanism comprises a support frame and positioning edges formed by extending the two ends of the support frame upward perpendicular to the wire running direction; The first air sealing mechanism is arranged on the two positioning edges to form the wire-traveling channel; A second diverter plate is disposed in an open cavity of the support frame away from the wire-feeding channel, and the second diverter plate is symmetrically disposed with respect to the wire-feeding channel and the first diverter plate.

7. The furnace mouth sealing and gas guiding device according to claim 6, characterized in that: The lower air intake hood is of a conical structure; Furthermore, the air inlet cross-section of the lower air inlet hood and the air inlet cross-section of the second diverter plate gradually increase toward the wire feeding channel.

8. The furnace mouth sealing and gas guiding device according to any one of claims 1 to 7, characterized in that: The first air-sealing hole group and the second air-sealing hole group include a plurality of long holes cross-distributed in multiple rows along the wire running direction.

9. The furnace mouth sealing and gas guiding device according to claim 8, characterized in that: The axes of the plurality of the long holes in the first gas sealing hole group and the second gas sealing hole group are arranged to be inclined toward the furnace body.

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